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EK-0LA75-CN-1

May 1988

150 pages

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Document:	LA75 User Guide Technical Documentation Change Notice
Order Number:	EK-0LA75-CN
Revision:	1
Pages:	150
Original Filename:

OCR Text

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EK-OLA75-CN-001

TECHNICAL DOCUMENTATION
CHANGE NOTICE

TECHNICAL CHANGE NOTICE FOR LA7S USER GUIDE (EK-OLA75-UG-002)

Please make the following changes in the LA75 User Guide (EK-OLA75-UG-002).
Page 12

Add step 2 as follows:

Check the serial number label on the printer's rear panel, next to
the power cord, to verify correct voltage to be used.
Make sure that the electrical outiet voitage and printer's voltage are

the same.
Page 13

Change steps 2 and 3 to steps 3 and 4, respectively.

Page 35

Last Note on the page should read as follows:
NOTE: The LA75 printer configuration is factory set for use with

Digital's computer systems, with the most commonly used features
enabled. If you have trouble printing your files correctly, you may need to

change the printer's configuration

Read and follow the steps outlined in

Chapter 4, Configuring the Printer, for information on how to make these

changes.
Page 38

Last paragraph on the page should read as follows:
The bail bar level has two positions: CLOSED, which moves the paper
ball against the platen, and AUTOPARK, which backs the pinfeed paper

away from the platen to allow printing on a single sheet of paper. The
bail bar wili not remain in the AUTOPARK position and will automatically
return to the CLOSED position.

digital equipment corporation « maynard, massachusetts
© 1988 by Digital Equipment Corporation

Page 113

Add Table 5-2.
Table 5-2 Fuse Replacement Information
e

Modei

dae

smman

emn

Fuse Rating

[A?S-A; \

o 1-6— ) 700/1;;)

ween

Digital

Part Number

(V)

(A)

)

;9:'-26003-00

LA75-A3

2207240

29-26004-00

LA75-Ad

1.0

220/240

29-26004-00

LA75-A5

1.6

100/120

29-26003-00

"Accessories” should be changed as follows:

ACCESSORIES
Option Number

Description

European

PCXXF-CF

EO-LA75X-DS

Acryilic desk-top stand

LASOX-FF

Paper catcher

LAXXA-AA

EO-LA75X-FD

Desk stand acoustic cover

HO401-A

EO-HQ401-AA

Crossover serial switch

[\F)

Page 115

SUPPLIES

Option Number

Description

uUs

European

BC16E-10

System interface cable

LASOR-06

EO-LAS0R-06

Nylon ribbon cartridges, 6 per

box

PCXXA-AM/AB

PCXXA-AM

Platen cleaner, 10 applications

per box

Paper, 9-1/2in X 11in, 1/2in

H9850-PA

perforated edges, 20 ib, 2700
sheets per carion

H9850-LR

Paper, 9-1/2in X 11in, 1/2in

perforaicd edges, 20ib, 540
sheets per pack

EO-PAPER-PF

Paper, 249mm X 279mm,
13mm (1/2in) perforated

edges, 2000 sheets per
carton, lines
EO-PAPER-PH

Paper, 243mm X 279mm,

13mm (1/2in) perforated
edges, 2000 sheets per
carton, no lines

EO-PAPER-AW

Paper, 240mm X 305mm,

13mm (1/2in) perforated
edges. 2000 sheets per
carton, no lines

EO-LA75X-PR

Premotion kit. desk stand,

paper basket dustcover, ribbons, and paper

TECHNICAL DOCUMENTATION

CHANGE NOTICE

EK-OLA75-UG-CN1

Installing and Using the LA75
Companion Printer
EK-OLA75-UG-002

This notice contains changes to Installing and Using the LA756 Companion
Printer. Please keep this notice with your manual.

Replace page 7 of your manual with page 2 of this change notice.

digital equipment corporation « maynard, massachusetts

Page 7 Installing the Printer
2.

Remove the cardboard packing.

EK-0LA75-UG-CN2

TECHNICAL DOCUMENTATION

CHANGE NOTICE

This notice contains a change to Installing and Using the LA75
Companion Printer (EK-OLA75-UG).

Update your manual as indicated.
Page 8

Change step 2 as follows:
2. Turn the ribbon adjustment knob enough to tighten the ribbon. Turn
the knob in the direction indicated on the cartridge.

Page 49

Change step 8 as follows:
8. Move the bail bar release forward so that the bail bar moves away from
the platen.

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EK-0LA75-UG-002

Installing and Using the
LA75 Companion Printer

Prepared by Educational Services

of Digital Equipment Corporation

1st Edition, May 1986
2nd Edition. December 1986

Printed in U.S
A

The reproduction of this material, in part or whole, s strictly prohibited. For copy
information, contact the Educational Services Department, Digital Equipment

Corporation, Maynard, Massachusetts 01754
The information in this document is subject to change without notice. Digital
Equipment Corporation assumes no responsibity for any errors that may appear in
this document,
This equipment generates and uses radio frequency energy and it not installed
properly, that i1s 1n strict accordance with the manufacturer’'s instructions, may cause

interference to radio and television reception It has been type tested and found to

comply with the hmits for a Class B computing device in accordance with the specitications 1n Subpart J of part 15 of FCC Rules, which are designed to provide reason-

able protection against such interference in a residential installation. However, there 1s
no guarantee that interterence will not occur in a particular instaliation. if this equipment does cause interference to radio or teievision reception, which can be determined by turning the equipment oft and on, the user is encouraged to try to correct the
interference by one or more of the following measures.

Reorient the receiving antenna.
Relocate the receiver with respect to the prin.er.
Move the printer away from the receiver

Piug the printer intc a different outlet so that the printer and receiver are on different branch circuits

If necessary, the user should consult the dealer or an experienced radio/television

technician for additional suggestions. The user may tind the booklet How to !dentity

and Resolve Radio/TV Interference Problems, prepared by the Federal Communications Commussion, helpful This booklet 1s available trom the U .S Government
Printing Oftice. Washington. DC 20402, Stock No. 004-000-00345-4.
IBM is a registered trademark ot International Business Machines Corporation.

The following are trademarks of Digital Equipment Corporation, Maynard,
Massachusetts.

a1 ol [1lal1 8

DECUS

P/OS

VAX

DECnet

RSTS

DECsystem-10
DEZSYSTEM-20

MASSBUS
PDP

RSX
UNIBUS

Work Processor

DEC
DECmate

DECwriter
DIBOL

Protessional
Rainbow

VAXmate
VMA

CONTENTS

INTRODUCTION
SECTION 1
1

INSTALLING THE LA75 COMPANION PRINTER

INSTALLING THE PRINTER

Checking the Contents of the Box ... PR U

Site CoNSIAErations ...

A LOOK atthe Printer ... ...
e

Removing the Packing Material ...

Installing the Ribbon Cartridge ...

Installing the Power Cord ...

Testing the Printer

... . e

Connecting the Printer to a Computer System ....... T e

Printing @ File ..o

If You Have Ditficulties Prsntmq a Flle .......................................................

SECTION 2
2

USING THE LA75 COMPANION PRINTER

PRINTING FILES

About the LA7S5 Control Panel ...

Printer Operating Controls and Indicators ...,

Prnting Files ...

Contents

LOADING PAPER

Paper Controls ... s

38
A

Bottom Load (meeed Papen ............................................................. e
Rear Load (Pinteed Paper) ... ... ... ...

42
BT

Loading Paper ... ...

Single Sheet

.. ... .

Adjusting the Printhead io* Paper Thl(,kness

Using the Low Tear Bar ... e
e

Removing the Low Tear Bar ...
s

CONFIGURING THE PRINTER

What is Contiguration? ... ... OO
Determining the Printer's Configuration .. ...

84
84

Set-Up Mode Controls and INdicators ... ...
U PN
Changing the Printer's Configuration ... SR

86
87

Value Select State ...l

Feature Select State ...

Saving New Values and Exmnq Set U;) Mode o
What Are Features and Values? ..
5

...

MAINTAINING THE PRINTER

General Maintenance

Correcting Simple F’roblems

...

Removing and Replacing the Rubbon Carmdge

. 102

Removing and Replacing the Printhead ...
.. ... e 108
Removing and Replacing the Fuse ...

...

APPENDIX A

ACCESSORIES AND SUPPLIES

APPENDIX B

FIELD SERVICE INFORMATION

APPENDIX C

OPERATING SPECIFICATIONS

APPENDIX D

ESCAPE SEQUENCES

...

e 112

TABLES

1-1

Interface/System Cable Adapters ... ...

3-1

Lo~ding Methods and Types of Paper

...

4-1

Fac

4-2

LAT75 Features, Values, and Factory Semngs .....................................................

5-1

Troubleshooting Checklist . ......... B s

.y-Set Contigurations ... ...

INTRODUCTION

ABOUT THIS BOOK
Installing and Using the LA75 Companion Printer is part of the LA75 Companion

Printer documentation package. This book is written for someone with little or no

computer experience. It teaches you how to install and operate the printer.
This guide 1s divided into five chapters and has four appendices.

Chapter 1

Installing the Printer

This chapter describes how to unpack and install the printer. It names the printer
parts, shows you how to test the printer, and how to connect the printer to your

computer system or video terminal. Read this chapter completely before you
begin the installation procedure.
Chapter 2

Printing Files

This chapter teaches you how to use the printer's operating controls to print

your files.

Chapter3

Loading Paper

This chapter provides a detailed explanation of the different ways to load
paper.

Chapter 4

Configuring the Printer

This chapter explains how to configure the printer so that it can communicate with
your computer system.

Introduction

Chapter 5

WMaintaining the Printer

This chapier ieiis how to keep the printer clean, how to replace the ribbon cartridge and the fuse, and install or replace the printhead. A troubleshooting checklistin this chapter can help you identify and correct simple probiems and possibly

save you a service call.
Appendices
Appendix A has information and order numbers for accessories and supplies.

Appendix B has information on repairs and calling Field Service.
Appendix C has technical specifications and paper specifications.
Appendix D has a summary of basic escape sequences.

Warnings, Cautions, and Notes
The warnings, cautions, and notes in this guide have specific purposes.

WARNING:

Contains information about preventing personal injury.

CAUTION:

Contains information about preventing damage to equipment.

NOTE:

Contains general information you should be aware of.

Introduction

vii

ABOUT THE DOCUMENTATION PACKAGE
There are two other documents in this package that are intended for the applications programmer who needs interface and control function descriptions.

LA75 Companion Printer Programmer

EK-OLA75-RM

Reference Manual

LA75 Companion Printer Programmer

EK-OLA75-RC

Reference Card

Both the programmer reference manual and the programmer reference card are
intended for the user with programming experience. A programmer uses the
information to design application software programs or to update existing
programs.

SOFTWARE REQUIREMENTS
The LA75 has many features. The features you can use depend on the following conditions.

The computer system (also known as the host) that the printer is con-

nected to.
s

The operating software that your computer system uses.

The software program you are using.

Check the documentation for the software you are using to learn what printer
features you can access.

Your software may allow insertion of the printer attribute escape sequences.

Some basic escape sequences are listed in Appendix D of this guide. Refer to
your software documentation for information about how to insert escape
sequences.

If you are not a programmer and need help choosing the right software package
for your application needs, contact your Digital sales representative.

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INSTALLING THE PRINTER

This chapter describes how to unpack and install the printer. It names the printer
parts, shows you how to test the printer, and how to connect the printer to your

computer. Read this chapter completely before you begin the installation
procedure.
Checking the Contents of the Box ..........................
.. ST

PRSP UOURURRPY

Site Considerations ..........cccoooi i,

ALookatthe Printer ... e,

Removing the Packing Material ...

Installing the Ribbon Cartridge ................ocooiiiiiiiiii e

Installing the Power Cord ...

e 12

Testing the Printer ... 14

Connecting the Printer to a Computer System .......................ccoiieviiiennn, 26
Table 1-1

Interface/System Cable Adapters ......................n, 29

Printing @ File ... 30
If You Have Difficulties Printinga File .......................ocoo

e 30

installing the Printer

E CONTENTS OF THE BOX
5 and make sure you have all the items shown below. If any items
damaged, immediately contact your sales representative and
delivery agent.
Please complete the installation procedures in sequence. After you install the

LA75, keep this guide near the printer for easy reference.

POWER

CORD

RIBBON

CARTRIDGE 7

INTERFACE

DOCUMENTATION

CABLE

PACKAGE

M D17 ARG

Installing the Printer

SITE CONSIDERATIONS
The LAT75 can be installed in an office, school, or home environment.

Environmental Conditions
¢

[nstall the printer in an area away from a heater or other heat source, and
away from an air conditioner or strong drafts.

Avoid installing the printer in a dusty or humid environment.

Work Location
¢

Place the printer on a flat, solid, level area such as a desk or printer

stand.

Allow enough space around the printer to ensure correct ventilation and
easy access to all sides of the printer.

Power Requirements
¢

No special wiring is required. A typical household or office wall outlet is
sufficient.

Do not plug other equipment such as coffee pots, office copiers, or air conditioners into the same wall outlet.

NOTE:

See Appendix C for more detailed specifications.

Installing the Printer

A LOOK AT THE PRINTER
Before installing the LA75, take a minute to familiarize yourself with the
printer.

ACCESS COVER

PRINT VY!NDOW
\

BALL BAR
PRINTHFAD

TRACTOR

ADJUSTMENT
LEVER

RELEASE

d \.‘

\f‘
- \“\
/
BA'L BAR
LEVER

PRINTHEAD
RiIBBON
CARTRIDGE

M 0122 86

instailing the Printer

PRINT WINDOW

LOW TEAR

BAR

PAPER

GUIDE

SAPER COVER

INTERFACE CABLE
RECEPTACLE

POWER CORD
RECEPTACLE
Ma (312386

Installing the Printer

Removing the Packing Material
1.

Remove the access cover.

Installing the Printer

Remove the packing from the ribbon cartridge area.

Remove the yellow rubber tubing from the carriage shaft.

YELLOW

RUBBER
TUBING

PACKING

MA DTRTBRA

Installing the Printer

Installing the Ribbon Cartridge
1.

Remove the ribbon cartridge from the wrapper.

Turn the ribbon adjustment knob in the direction indicated on the
cartridge.

RiBBON
CARTRIDGE

installing the Printer

soooa

sure the ribbon fits between the printhead and the smudge guard. Press

down on the cartridge until you hear it click into place.
NOTE:

Make sure the ribbon is secured on both the left and right sides.

SMUDGE GUARD

MOUNTING

cLIp

0127
86

installing the Printer

Turn the ribbon adjustment ¥nob enough to tighten the ribbon.

MA DY 2R At

installing the Printer

5.
NOTE:

Replace the access cover.
The printer does not work with the access cover off.

MA 0128 856

Installing the Printer

installing the Power Cord
1.

Make sure the power switch is set to 0 (off).

Installing the Printer

Plug the power cord into the back of the printer.

Plug the other end of the cord into the slectrical outlet.

MA 0131 8E

Installing the Printer

TESTING THE PRINTER
The print self-test allows the printer to check its operation independently. To load
paper into the printer and run the self-test, perform the following steps.

1. Make sure the power switch is set to 0 (off).

Installing the Printer

Open the print window. Remove the paper cover.

PAPEH COVER

PRINT WINDOW

MADTT

ARG

Installing the Printer

Unlock only the clamp on the right tractor by pulling the clamp toward the
front of the printer.

NQOTE:

The left tractor has been factory set so that the left edge of the paper

(column 1) lines up correctly with the printhead when it starts printing. Digital
recommends that you do not unlock the left tractor clamp.

Instailing the Printer

Open both tractor doors.

Installing the Printer

Alignthe pinfeed holes on both edges of the paper with the tractor pins of
both tractors. Close the tractor doors to secure the paper.

MA D150 86

Installing the Printer

€.

Readjust the right tractor position by moving it to the right so that the
paper i3 stretched tightly between the two tractors. Lock the right tractor
in place by pushing the tractor clamp toward the back of the printer.

NOTE:

Ityou stretch the paper too tightly, the side pertorations will tear or the

pin holes can enlarge.

Installing the Printer

Pulithe paper release lever toward the front of the printer to set the printer
in tractor mode.

MA 0189 86

Installing the Printer

Puli the bail bar lever toward the front of the printer.
The bail bar moves away from the platen.

M4 0136-85

Installing the Printer

Turn the platen knob toward the back of the printer to position the paper
above the bail bar.

ML G BR

Installing the Printer

10.

Push the bail bar lever toward the back of the printer to set the bail bar
against the paper and the platen.

Ma 0110 B

Installing the Printer

11.

Replace the paper cover. Close the print window.

A 0140 BF

12.

Press and hold down the Form Feed switch, and turn the power switch
to 1 (on).

Protocot

Power

Fault

Ready

Quality
2 DEC

Set-up

L3 Other

[

Feaiure

nNLQ

Line

Foarm

Feed

Fead

Previou$

Vaiue

4 0139 BA

Installing the Printer

13.

Release the Form Feed switch. The printer produces the following
pattern.

CCREAR
CUBERS

iRy

THEYR

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MA 0169-86

After a few lines of printout, turn off the power switch to stop the self-test.
The printout pattern should match the sample above.

NOTE:

It the printer does not pass the sell-test, see Table 5-1, Trouble-

shooting Checklist.

Installing the Printer

CONNECTING THE PRINTER TO A COMPUTER SYSTEM
1.

Turn the power switch to 0 (off).

MaA 0YI0 Rf

Installing the Printer

Plug the interface cable into the back of the printer.

Installing the Printer

Plugthe other end of the interface cabile directly into your host computer.
If you use an adapter, first plug the interface cable into the appropriate
adapter and then to your host computer or video terminal (with printer
port).

NOTE:

See Table 1-1 for
a list of adapters.

Installing the Printer

HB571 B
9PIN
ADAPTER

PRINTER
PORT

/’/

TERMINAL
P o

H8571 A

25 PIN

PRINTER

ADAPTER

//
PH‘NthH *"“‘/”“'.
TO

AL DV R

ADAPTERS A AND B
(D NOT SHOWN)

Table 1-1

Interface/System Cable Adapters

Host Computer/Video Terminal

Adapter Part Number

VT100 series with printer port
VT200 series

HB571-A
H8571-B

PC100 series (Rainbow)

HB571-D

PC325 (Professional)

H8571-B

PC350 (Professional)
PC380 (Professional)

H8571-B
H8571-B

DECmate

H8571-B

VAXstation H

HB8571-B

NOTE:

Use the H8571-A adapter for any host computer not listed in this table that

has an R5232 serial 25-nin male printer port. Use the H8571-8B adapter for any host
computer not in this table that has an RS232 serial 9-pin male printer port.

Order adapters through the DECdirect catalog by using the adapter part number.

Installing the Printer

Printing a File
Refer to your computer system documentation for information about operating the
printer with your computer. Your computer or terminal may require printer set-up

before it can operate with the printer.

If your computer does not require printer set-up, you can print a file by following
these steps.

Make sure there is paper in the printer and that you have advanced the
paper to the print position.

Turn your computer or video terminal on.

Turn the power switch on the LA75 to 1 (on). The printer is ready to
print.

Follow the instructions in your computer system’s documentation on
printing a file.

NOTE:

Make sure you turn on your host computer first, then turn on the printer. The

printer may print error characters if not powered on in this sequence. Make sure you
turn off the printer first, then turn off the host computer.

if You Have Difficulties Printing a File
Here are some suggestions if your file does not print, or if the file

prints

incorrectly.

Check the printer and the host computer configuration set-up. The printer’'s

baud rate, parity and data bits. and protocol should match those of the host

computer. Table 4-1, Factory Set Configurations, has information on these
three features. Also check your computer system’'s documentation for
information on these features.

Read and follow the directions in Chapter 4, Configuring the Printer.if you
must

change

the

printer's

configuration

set-up

match

your

host

see

the

computer’s configuration.
3.

your

printer

stil

does

not

your

files

correctly,

Troubleshooting Checklist in Chapter 5.

If you are not sure of how to correct the problem, call Digital service. See

Appendix B in this guide for more service information.

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PRINTING FILES

This chapter teaches you how to use the printer controls to print a file.

About the LA75 Control Panel ... .. ..
Printer Operating Controls and Indicators ........................ TR
Printing Files .. O
R PPN T P

Printing Files

ABOUT THE LA75 CONTROL PANEL
In this chapter you will learn how to use the printer’s operating controls and how to
printyour files. To print files, the control panel switches perform the functions that

appear in white letters above the switch.

Protocol

Power
£ DEC

Setup

T3 Other

Fault
[wa ]

Print
Quatity

Foature

Ready
s TR
CanNLQ

| )
Vol

Line

Form

Feed

Previnus
[AARTIR-T1

NOTE:

The functions on the controi panel that appear below the switches are

explained in Chapter 4, Contiguring the Printer.

Printing Files

Printer Operating Controls and Indicators
Power Indicator
The power indicator is green. It lights when the printer is turned on.

Fauit Indicator
The fault indicator is red. It ights and stays lit when the paper supply is out or if

there is a mechanical problem.

The Fault indicator flashes continuously when the printer finds an electronic problem.

See Table 5-1, Troubleshooting Checklist, to determine the probable cause of the
problem and suggestions for correcting it.
Ready
The Ready switch puts the printer on-line or off-line. When the Ready indicator
lights, the printer is on-line and ready to print. When the Ready indicator is not

lit.the printer is off-line and will not print.

If you press the Ready switch while the printer is printing (putting it off-line), the
LA75 completes only the line it is printing and then stops.
The Fault indicator lights when the printer is at or near the end of the paper. You
can press the Ready switch to print one line at a time on the sheet the printer is
printing on before loading more paper into the printer.

Protocol
The Protocol switch lets you change the way the printer communicates with your

computer system. To change between "DEC" and "Other,” press the switch
once.

NQTE:

Use "Qther” when you

Proprinter.

want the LA75 to perform like the IBM

Printing Files

Print Quality
The Print Quality switch allows you three choices of print quality:
1.

Letter quality (LQ), which prints at 32 characters per second (char/s),
and

Near letter quality (NLQ), which prints at 42 char/s.

in both cases, an indicator lights next to the print quality you have
selected.

If no indicator lights, the print guality is controlled by what you programmed

into the

printer's

set-up

memory,

through

software

commands.

The LA75 has two other print gualities: memo quality (125 char/s) and draft

quality (250char/s). See Chapter 4, Configuring the Printer, for more information
on print qualities.

NQTE:

Allcharacter per second(char/s) speeds listed in this book are quoted at their

maximum burst speeds. See Appendix C for more information on character per
second speeds.

tiratt

Thiz

pranting.

an example of

an example of Memo printing.

example

NLG

prainting

example

printing.

Memo

This

[raft

NLQ
This

This

MA . 0166-86

Printing Files

Line Feed
The Line Feed switch advances the paper in the printer one line at a time. Continued
pressure on the switch advances the paper a number of lines.
Form Feed
The Form Feed switch advances the paper in the printer one form length at a ime.

Printing Files
NOTE:

Make sure that there 1s paper ioaded in the printer. Use the platen knob to

advance the paper to the print position. Print position is usually just below the perforation on continuous pinfeed paper.

NOTE:

Make sure you turn on your host computer hrst, then turn on the printer. The

printer may print error characters it not powered on in this sequence. Make sure you
turn off the printer first, then turn off the host computer.
1.

Set the power switch to 1 (on). The green Power indicator lights.

Choose Protocol, if necessary. The indicator next to your choice lights.

Choose Print Quality, if necessary. The indicator next to your choice lights.
You are now ready to print.

NOTE:

The LA7S5 printer configuration is factory set for use with Digital's computer

systems in the United States. If you have trouble printing your files correctly, you may
need to change the printer's configuration. Read and foliow the steps outlined in

Chapter 4, Contiguring the Printer. for information on how to make these changes.

PAGE

INTENTIONALLY

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LOADING PAPER

This chapter gives a detailed explanation of the different ways to load paper, use the
printhead adjustment lever, and use the low tear bar.

Paper Controls .. ...

l.oading Paper
..
Table 3-1

. 38

Lo,.dinq Mnthods and Tvnps of Panpr

Bottom Load (Pinfeed Paper) ... ...
Rear Load (Pinfeed Paper) ....................... e
SINGIE SREEE

UOOORRUOS e, 41
P

URPRRPRUNRRY < &

e 42
e e 57

.o e 71

Adjusting the Printhead for Paper ThiCkNeSS ... ..o, 78
Usingthe Low TearBar . ..., OO
P RO UOUOTUPR 79
Removing the Low Tear Bar ... e e 81

Loading Paper

PAPER CONTROLS
The levers and controls described in this section are used for loading and
positioning paper in the printer.

TRACTOR
AP,

TRACTOR )‘ AP
("

POSITIONERS

STOR

TRACTOR

‘\\‘s /

LEVER

RELEASE

)

PAPER

CLEVER

RELEASE

"""

TRACTOR
RELEASE

LEVER

BAl{ BAR
LEVER

LS TN

Bail Bar Lever
The bail bar lever controls the paper bail and the autopark function. This function
is used for loading single sheets of paper when pinfeed paper is in the printer.

The bail bar lever has three positions: closed, which moves the paper bail against

the platen; open, which moves the paper bail away from the platen; and autopark,
which backs pinfeed paper away from the platen to aliow printing on a single

sheet.

Loading Paper

Bail Bar
Thebail bar holds the paper against the platen. The red etch marks onthe bail bar

indicate the print area for a standard sheet of paper. Use these etch marks to help
position the paper correctly.

Paper Release Lever

The paper release lever controls the paper holding tension. Pull the lever toward
the front of the printer for tractor feed. Push the lever toward the back of the printer for friction feed.

Platen Knob
The platen knob allows manual control of the platen for inserting paper and for
changing the paper’s vertical position.

Paper Positioners
The paper positioners underneath the paper cover help keep the pinfeed paper in the

correct position as it feeds into the printer.
Tractor Release Levers
The tractor release levers are used to position the entire tractor unitfor a push ora pull

paper feed operation.
Tractor Clamps
The tractor clamps allow you to adjust the position or location of the tractors for

different paper sizes. Pull the clamp toward the front of the printer to move the tractor
to the left or right. Push the clamp toward the back of the printer to lock the
tractor in place.

Tractor Stop
The tractor stop prevents the left tractor from being moved too far to the right. This
enables the left edge ot the paper (column 1) to line up correctly with the printhead
when it starts printing.

Loading Paper

Printhead Adjustment Lever
The printhead adjustment iever changes the printhead position to allow for different thicknesses of paper, and for forms or envelopes. This lever can be moved
in four positions to vary the distance between the printhead and the platen. (See
Adjusting the Printhead on page 78 for more information.)

SINGLE

SHEETS

ENVELOPES

AND

MULTIPLE

SHEE:'TS

WMA 0144-86

Loading Paper

LOADING PAPER

There are three ways to load paper for the LA75:
+

Load pinfeed paper through the printer's bottom slot.

L.oad pinfeed paper at the back of the printer.

Hand feed single sheets at the back of the printer.

NOTE:

Bottom feeding is intended for printing applications using forward paper

motion only. For applications which require reverse paper motion to achieve printing
functions such as bolding, underlining, and super/sub scripting, using the rear paper
feed method.

See Table 3-1 for Digital's recommendations on using the three methods.

Table 3-1

Loading Methods and Types of Paper

Method
Bottom feed

Rear feed

‘

Type of Paper

Type of Printing

Pinfeed paper

Text and graphics

Single-part

Multipart

Labels

Pinfeed paper
«

Hand feed

Single-part

Single sheets
+ Single sheets
+
+

Envelopes
Single forms

Text and graphics

Loading Paper

Bottom Load {Pinieed Paper - Tractors in the Puil Position)
NOTE:

Using the printer’s bottom slot requires a special printer table or stand.

Talk to your Digital sales representative or see Appendix A for ordering information.

The printer is shipped to you with the tractors in the push position (tractors in

down position). To load pinfeed paper through the bottom siot, you must first set
the tractors in the pull position. Steps 1 through 4 tell how to setthe tractors in the
pull position.

Turn the power switch to 0 (off).

Loading Paper

Remove the access cover and the paper cover.

MA 0145 86

Loading Paper

3. Move the left tractor release lever toward the front of the printer until it
locks.

Ma DY /7T 86

Loading Paper

. Move the right tractor release lever toward the front of the printer while
pulling the tractor unit up. The tractors are now in the puli position.

QI8 86

Loading Paper

5. Unlock the clamp on the righttractor by pulling the clamp toward the front
of the printer.

NOTE: Check thatthe lefttractor is againstthe tractor stop. Ititis not, unlock the
left tractor clamp and move the tractor to the right until it stops. This enables the
left edge of the paper (column 1) to line up correctly with the printhead when it
starts printing.

Loading Paper

Open both tractor doors.

M2 0Y70-B6

Loading Paper

Movethe paperrelease lever toward the front of the printer to setthe printer
in tractor mode.

wAIYIRT

Loading Paper

8. Move the bail bar release lever forward to the middle position so that the
bail bar moves away from the platen.

Loading Paper

9. Insert the papei through the bottom slot of the printer.

NOTE:

Toprevent skewing, position the paper so that it feeds straight into the bottom

of the printer.

Ma 0yan s

Loading Paper

10. Pull the paper up between the platen and the smudge guard and bring it
back to the tractors.

Loading Paper

11. Align the pinfeed holes on both edges of the paper with the tractor pins of
both tractors. Close the tractor doors to secure the paper.

NOTE:

The red etch marks on the bail bar indicate the print area for a standard

sheet of paper. Use these etch marks to help position the paper correctly.

o
01

Loading Paper

12. Adjust the right tractor by moving it to the right or left so that the paper is
stretched taut between the two tractors. Lock both tractors in place by
pushing the clamps toward the back of the printer.

NOTE:

If the paper is stretched too tightly, the side perforations will tear or the

pin holes can enlarge.

MA 11B4. BE

Loading Paper

13. Adijust the paper by pulling it down from beneath the printer's bottom
siot.

MA D185 §i

Loading Paper

14.

Movethe bail bar lever toward the back of the printer so that the bail bar is
against the paper and piaten.

M e

Loading Paper

15.

Replace the access cover and paper cover.

MA QYRR A6

16.

Use the platen knob to advance the paper to the print position.
You are now ready to print.

Loading Paper

Rear Load (Pinfeed Paper - Tractors in the Push Position)

NOTE:
method.

Digital recommends that you use only single-part paper for this

Loading Paper

Steps 1 through 4 tell how to set the tractors in the push position.
1. Turn the power switch to O (off).

Loading Paper

2. Open the print window and remove the paper cover.

PAPER COVER

PRINT WiINDOW

MANtIRE

Loading Paper

3. Move the left tractor release lever toward the front of the printer until it
locks.

Loading Paper

4. Move the right tractor release lever toward the front of the printer while
pushing the tractor unit down. The tractors are now in the push
position.

MA 018 BB

Loading Paper

5. Unlock the clamp onthe right tractor by pulling the clamp toward the front
of the printer.

NOTE: Check thatthe lefttractorisagainstthe tractor stop. ititis not, unlock the
left tractor clamp and move the tractor to the right until it stops. This enables the
left edge of the paper (column 1) to line up correctly with the printhead when it
starts printing.

Loading Paper

6. Open both tractor doors.

MA 0135 86

Loading Paper

7. Align the pinfeed holes ¢:n both edges of the paper with the tractor pins of
both tractors. Close the tractor door to secure the paper.

NOTE: The redetch marks on the bail bar indicate the printarea for a standard
sheet of paper. Use these etch marks to help position the paper correctly.

Ma 0100 86

Loading Paper

8. Adjustthe right tractor by moving it to the right or left so that the paper is
stretched taut between the two tractors. Lock the right tractor clamp by
pushing the clamp toward the back of the printer.

NOTE:

It you stretch the paper too tightly, the side perforations will tear or the

pin holes can enlarge.

Ma Otht B

Loading Paper

Move the paper release lever to the front of the printer to set the printer in
tractor mode.

GIRY He

Loading Paper

Moving the Paper to the Print Position

You can now advance the paper to the print position manually or automatically.

Advancing the Paper Manually

1. Turnthe platen knob toward the back of the printer untilthe paper isin the
print position.

2. Replace the paper cover. Close the print window.

Ma 017 86

Activating the Automatic Paper Feed

1. Turn the power'switch to 1 (on).
The Power and Fault indicators light.

The printhead moves to the center to the print position.

NOTE: If the Fault indicator does not light, the paper is toco close to the platen.
Turn the platen knob toward the back of the printer until the Fault indicator
lights.

A 015 RE

Loading Paper

CAUTION:

Before performing step 2, make sure the bail bar is resting against

the platen.

Press the Form Feed switch.

The paper automatically moves under the platen to the print position.

Protacol

Power

DEC

Set-up

£ Qther

Fault

[

Uuahity

Ready

Feature

aLQ

CIANLO

Line

Value

Form

Feed

}

[XESGIRTE T

Replace the paper cover. Close the print window.

Loading Paper

Pull out the wire paper separator.

PAPER

SEPARATOR

You are now ready to print.

Loading Paper

Loading Single Sheets of Paper
{With or Without Finfeed Paper in the Printer)

NOTE:

To print on a single sheet of paper with pinfeed paper already loaded,

follow step 2 on page 72.
1. Turn the power switch to 1 (on).

The Power and Fault indicators light.

MA 0162
85

lLoading Paper

2. Back the pinfeed paper off the platen by pulling the bail bar lever all the way
forward to the autopark position.

The paper backs out of the print position and remains in the tractors.

NOTE.

The aulopark

teature allows

you

to back

out only two

(55.88 centimeters, 22 inches) at a time.

You are now ready to load a single sheet of paper.

pages

Loading Paper

3. Open the print window.

4. Raise the paper guide and secure it in place. Pull out the paper
separator.

Loading Paper

5. Move the paper release lever toward the back of the printer so that itis in
friction mode.

6. Place a single sheet of paper on the paper guide so that the paper is resting just under the platen.

NOTE:

The red etch marks on the bail bar indicate the printarea fora standard

sheet of paper. Use these etch marks to help position the paper correctly.

If the Fault indicator goes out when the paper is inserted, move the paper away
from the platen until the Fault indicator lights.

Az 012 B6

Loading Paper

7. Move the paper edge guide to the right until it is aligned with the arrow on
the paper guide.

Ma 16685

Loading Paper

Moving the Paper to the Print Position

You can now advance the paper to the print position manually or automatically.

Advancing the Paper Manually

1. Turnthe platen knob toward the back of the printer until the paper isinthe
print position.

2. Close the print window.

A 017 86

Loading Paper

Activating the Automatic Paper Feed

CAUTION:

Belore performing step 1, make sure the bail bar is resting against

the platen.

Press the Form Feed switch.

The paper automatically moves under the piaten to the print position.

Protocot

Power
£3 DEC

Set-up

3 Other

Faiiit
[

Gualty

Feature

Ready
[w]

caLa

CINLQ

Line

Value

Form

Feed

Faod

aMA DTG ARG

2. Close the print window.

You are now ready to print on the single sheet.

NOTE:

Toreload the pinteed paper after you have finished printing on the single

sheet, see Rear Load (Pinfeed Paper) in Chapter 3.

Loading Paper

ADJUSTING THE PRINTHEAD FOR PAPER THICKNESS
For single-part pinfeed paper and single-shee., hand-fed paper:

Push the printhead adjustment lever all the way toward the plater.

For muitipart paper or envelopes:

Pull the lever toward the front of the printer.

SINGLE

ENVELOPES
AND
MULTIPLE

SHEETS

MA 0as B8

Loading Paper

USING THE LOW TEAR BAR

The low tear bar allows you to tear off forms or paper one inch above the
printhead. Use the low tear bar only with pinfeed paper fed from the back of
the printer.
1.

Print your file.

2. Open the print window.

9. Make sure that the horizontal perforations of the form or paper are just
above the low tear bar. If they are not, press Line Feed until the perforations rest against the low tear bar.

PERFORATION
L _

LINE

Loading Paper

4. Pull the paper or form across the low tear bar until the paper is detached
from the next sheet.

5. Close the print window.

Loading Paper

REMOVING THE LOW TEAR BAR
1. Remove the access cover from the printer.

Ma 0160 88

L.oading Paper

2. Open the print window and slide the low tear bar oft.

MA 0174 B8

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CONFIGURING THE PRINTER

This chapter explains how to configure the printer so that it can communicate with
your computer.

What is Configuration? ... . 84
Determining the Printer's Configuration ..., 84
Table 4-1 Factory-Set Configurations ... .........cccoeeiiiiiiiin 85
Set-Up Mode Controls and INdicators ... 86
Changing the Printer’s Configuration ..., 87
ValUue SeleCt State ..o 88
e 88
eo
FRAtUTE SelECt Slale ..
Saving New Values and Exiting Set-UpMode ..., 89
e, 89
What Are Features and ValuBS? ...t
Table 4-2 LA75 Features, Values, and Factory Settings

Contiguring the Printer

WHAT IS CONFIGURATION?
In this chapter you will learn how to set-up, or configure, the printer so that your
printer and computer can communicate with each other correctly.

Communication between the computer and the printer requires that both the
computer operating system and the printer have the same communication settings, or features. The mostimportant of these are baud rate, data bits and parity,

and protocol. You may also need to change some of the printer's other features
depending on your hardware and software requirements. (See Table 4-2 for a
complete list of printer features.)

Set-up mode allows you to access the LA75's configuration memory. The memory
stores a list of all the printer’s features and values, as well as which values you
have chosen to run the printer. The set-up controls, which are discussed in the
following section, allow you to access set-up mode.

Determining the Printer's Configuration
Check your computer system’'s documentation to determine what your system
requirements are for baud rate, data bits and parity, and protocol.

NOTE:

VAXmate users consult your system administrator for printer set-up

instructions.

Check to see what is programmed into your LA75's set-up memory by following
these instructions.
1.

Turn the power switch to 0 (off).

Press and hoid the Set-up switch while you set the power switch to 1
(on).

The LA75 prints alist of whatis inits set-up memory. Table 4-1is an example of what information is stored in set-up memory.
3.

Pressthe Set-up switch and turn off the power switch.

Comparethe printer's current configuration with the requirements of your
computer or video terminal. Read the following sections if you need to
change the printer's set-up memory.

Configuring the Printer

Yable 4-1

Factory-Set Configurations

LA7%-5

Version

Feature

Value
T

4800

Frotocol

DEC

Foarm Length

[DEC

Dratt

LASC

Truncate

raud

Rate

Llata

Bits

ang

Character

Set

Supplemental
FPraint

Faraty

(LEC)
(Chavacter

Density

Frainter

Set

(DEC)

(LQEC)

Supplemental

Auto

(DEC)

NDO

Auto

(DEC)

Auty

Cancel

80 Columns
Oon

Iaro without

Code

132

Columns

Faper

Qut

Bell

Glashed

Zevo

Auto LF

on CR

Active

Auto

Fower-up
L@

Baud

NLD

kate

(DEC)
(DEL)

(Emulation)

Character

(DEC)

AsCll

Mode

Control

Margin

Text

CAN

Right

anches

(DEC)

None

]

Code

Set

iEmulation)

(Emulation)

Density

(Emulation)

Control

No auto LF

Graphics

Draft

Select

agon

auto

set

Functaons

zlash

NLO

MA-0170-86

Configuring the Printer

SET-UP MODE CONTROLS AND INDICATORS
In set-up mode, the control panel performs the functions that appearin dark gray

letters below the switches.

Peotoenl

Power

Fault

Reaity

Quaiity

I DEC

Set-up

L3 Othier

| -

Feature

CNLO

F e

Feed

Fecqa

" Next

Value

TG A

Set-up
Pressing the Set-up switch while turning the printer on puts the printer in set-up
mode. After you have changed the printer’s configuration, pressing the Set-up
switch allows you to save the new values and exit set-up mode.

Feature
Pressing the Feature switch puts the printer in feature select state.

Value
Pressing the Value switch changes the printer from feature select state to value
select state.

Next
Pressing the Next switch lists and steps through the next feature or set of values
when you are setting the printer’'s configuration. Each time you press the Next

switcn, the printer advances one feature or vaiue.

Previous
Pressing the Previous switch allows you to go back one feature or value when you
are setting your printer’'s configuration. Each time you press the Previous switch,
the printer goes back one feature or value.

Contiguring the Printer

Changing the Prinier's Configuration (Set-Up Mode)
NOTE:

Before beginning the set-up procedure, make sure the power switch is

set to 0 (off) and that paper is advanced to the print position.
1.

Press and hold the Set-up switch while setting the power switch to 1
(on).

Protocol

Power

Fanit

Prisng

Ready

Quahity
£33 DEC

Othe

Setup

Line

Form

Foed

Fona

Newt

Previos

EONLQ

Featurm

Vaiue

The green Power indicator lights. The Other and the NLQ indicators
flash.

The printer automatically does the following:

¢ Prints a list of the features and values stored in its memory (Table
4-1).

e Enters feature select state (the indicator next to NLQ flashes).
e
4.

Prints the first feature in the list (baud rate) and its value.

Pressthe Next switch to see the next feature or the Previous switch to see
the previous feature.

Pressthe Value switch to enter value select state if you wantto change the
value for the first feature, or any other feature.

Configuring the Printer

Value Select State
1.

Press the Value switch.

Protocoi

Peras

Failt

Priot

Heady

F oot

(duratiny,
3 DEC
Setup

Other

aun

[

|wons BB

[: CIANLQ

Feature

[
Vatue

Previous
M 010 8

NOTE:

The indicator to the right of the Value switch begins Hashing, the NLQ

indicator stops flashing.

Press the Next switch or the Previous switch to see the next or previous
vaiue.

Stop at the value you want to select.

Now you can return to feature select state to list the next feature and
its value.

Feature Select State
1.

Press the Feature switch.

Pratocol

Power

2 DEC
Setup

Qther

Fanit

(-]

Prir

Criatity

Feature

Ready

| ouw SRS

EaNeQ

]
Value

Forrr,

F o

Fang

l_._, L.J
Next

Previous
KA 0119 AR

NOTE:

The indicator to the right cf the Value switch stops Hashing, the NLQ

indicator begins flashing.

Pressthe Nextswitch or the Previous switchto listthe nextor previous feature and its current value.

Stop at the feature whose value you want to change. Enter value select
state by pressing the Value switch.

Configuring the Printer

Saving New Values and Exiting Set-Up Mode
1.

Press the Set-up switch once to store your set-up changes in the printer's
memory.

NOTE:

At this time, either the DEC indicator or the Other indicator flashes,

depending on which value you selected for the feature Protocol.

Pratocol

Power

Fanit

Ready

Qualiny

£33 DEC
Set-up

3 Other

©)

C
Feature

aNLQ

e]
Vatue

Line

Form

Foed

Feong

U ___]
Newt

Previous
[PAE

NOTE:

R T

The printer automatically returns to print mode.

Ifthe poweristurnedoff before the Set-up switch is pressed, nochanges

are stored in the printer’'s memory.

WHAT ARE FEATURES AND VALUES?

The LA75 has 20 features or functions stored in its set-up memory. Each of the
features has at least two values (Table 4-2). A value is an option or choice within
each feature.

When you are in set-up mode, you can change the value for any feature. Changing
the set-up memory changes the way the printer runs and how it communicates
with your host computer.

An example will help to show the difference between a feature and a value.

The set-up menu gives you eight choices for the baud rate feature. Baud rate is

the speed at which the printer can receive data from your host computer. The
printer's baud rate is factory set at 4800 bits per second.

Suppose that your host computer's baud rate is set at 1200 bits per second. To
have accurate communication between your host computer and the printer, you
must change the LA75's baud rate value from 4800 to 1200.
in this example, baud rate is the feature; 4800 and 1200 are the values.

Configuring the Printer

Features 1 through 4

Features 1through 4 set the values for baud rate, data bits and parity, form length,
and protocol. Read your host computer’s user guide (or equivalent manual) to
determine the correct settings for your computer.
1.

Baud Rate is the speed (bits per second) at which the computer and the
printer communicate.

Data bits and parity determine the format the printer uses to communicate with the host computer.

Protocol determines with what host computer the LA75 is compatible.
value 1 (DEC) sets the printer to communicate and be compatible with
Digital's computers. Value 2 (Other) sets the printer to act like the IBM
Proprinter.

Form length allows you to define the page length to be either 11 or 12
inches.

Features 5 through 13 DECT Protocol

Features 5 threugh 13 are active if you have selected DEC for the Protocol
feature.

5. Characterset(1through 16) definesthe alphanumeric character sets with
which your files are printed. Choose the character set you usually use to
deveiop your files.

Supplemental character set allows you to choose one of four character
sets:

DEC

supplemental,

ISO

supplemental,

DEC

technical,

and

Katakana.

Print density defines the quality of print (number of dots per character).
The print densities are draft, memo, near letter quality, and letter quality.

Printer 1D defines the device name used by the printer when responding

to requests from your host computer, or application software. LAS0 ID
allows the printer to respond as an LA50. LA210 ID allows itto respond as
an LA210. Conformance level 2 allows it to respond as a level 2 device
(functionally equivalent to LA210 printer).

Contfiguring the Printer

Text mode right margin controls the processing of characters that go

beyond the right margin. Truncate ignores the characters in a line that
exceeds
the right margin. Wrap prints the characters thatexceed the right
margin on the next line beginning at the left margin.

10.

Auto line feed on CR determines whether the printer automatically
advances the paper one line when the carriage return control character
is received.

11.

Auto carriage return on LF determines whether the printer automatically
performs a carriage return when the line feed control character is
received.

12.

CAN control code allows you to cancel any current active control function
or to erase the input buffer.

13.

80 or 132 columns allows you to select print line width - 80 (10 characters
per inch) or 132 (16.5 characters per inch) columns.

Features 14 through 20 Other Protocol (IBM Emulation)
Features 14 through 20 are active if you select Other for the protocol feature.
These features let the LA7S emulate, or act like, the IBM Proprinter.
14.

Paper-out bell detarmines if the printer will sound a bell, when itdetects a
paper-out signal.

15.

Slashed zero gives you the choice of defining how the zerois printed: with
or without a slash through it.

16.

Autoline feed on CR determines whether the printer automatically advan-

ces the paper one line when the carriage return control character is
received.

17.

Active character set defines which graphics character set the printer
uses. Set A is a national set. Set B is a graphics and multinational set.

18.

Auto carriage return on LF determines whether the printer automatically
performs a carriage return when the line feed control character is
received.

Configuring the Printer

19. Power-up density determines the print quality the printer provides when it
is turned on (power-up). It can be draft (250 char/s), or print quality as
defined by the value of feature 20 (LQ or NLQ).

20. LQ or NLQ defines the print quality and is selected through emuiaticn
software. it also defines the value of feature 19 (power-up density).

NOTE:

Someofthese 20features can be overridden by software controls (Table

4-2).

LA7S Features, Values, and Factory Settings

Data bits

110
200

1200

*Factory-set value.

2400

4800*
9600
7-Even

W
S
~NM

Yes

7-Mark

8-Odd
8-None*

-—d

Yes

7-Space

DEC*

[

Form length

600

Other

wed

Protocol

300

7-0dd

and parity

Vaiue

Value
Number

Baud rate

Software
Controlied

O ~NNOOU

Feature
Number Feature

Table 4-2

12 inches

11 inches*

8-Even

Configuring the Printer

Table 4-2

LAT75 Features, Values, and Factory Settings {Cont)

Feature

Number Feature

Software

Controlied

Vailue

Number

Value

Yes

J.S. ASCII*

Great Britain

Character set
{DEC)

Supplemental

Yes

character set
(DEC)

Print density

Yes

{DEC)

DEC Finland

France

DEC French Canada

Germany

ltaly

JIS Roman

DEC Norway/Denmark

Spain

DEC Sweden

Norway/Denmark

DEC Dutch

DEC Swiss

DEC Portugal

(Reserved)

DEC suppismental*

1SO supplemental

DEC technical

Katakana

Draft*

Memo

NLQ

LASO ID*

Printer 1D

Conformance

{DEC)

level L.D.

LA210ID

only

Conformance
Leval 2

Text mode

Yes

right margin

Truncate*

Wrap

(DEC)
10

Autc LFonCR

Yes

{DEC)
11

Auto CRonLF

(DEC)

Yes

Auto LF on CR

No auto LF*

Auto CRon LF

No auto CR*

Configuring the Printer

Table 4-2

LA7S Features, Values, and Factory Settings {Cont)

Feature

Software

Value

Number Feature

Controlled

Number

CAN control

80 or 132

Yes

columns (DEC)
14

Paper-out bell

Yes

(Emutation)

Slashed zero

(Emulation)

Kill buffer

80 columns®*

132 columns

Off

On*

Zero with slash

Zero without slash*

Auto LF on CR

(Emuiation)

No auto LF*

Active character Yes

Graphics set A"

set (Emulation)

Graphics set B

Auto CRon LF

No auto CR*

Power-up densityYes

Draft*

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MAINTAINING THE PRINTER

This chapter describes how to keep ihe printer clean, replace the ribbon cartridge and the fuse, and install or replace the printhead. Table 5-1 is a trouble-

shooting checklist that can help you identity and correct simple problems and
possibly save a service call.

PO USPUS VSO PORO PSPPI 96
General Maintenance ............... TR
Correcting Simple Problems ... 97
Table 5-1 Troubleshooting Checklist ... a8
Removing and Replacing the Ribbon Cartridge ..., 102
Removing and Replacing the Printhead ... 108
Removing and Replacing the Fuse ... 112

Maintaining the Printer

GENERAL MAINTENANCE
The printer does not need preventive maintenance. Clean its surface withadamp

cloth only. Clean the platen with Digitai-recommended cleaner only (see Appendix A for ordering information). Do not use excessive water or cleaners with

solvents.

Office Area
To maintain correct operating temperatures, keep the printer away from extreme
temperatures, such as direct sunlight, room heaters, and air conditioners.
Keep paper clips, matches, coffee, and cold drinks away from the printer.
Paper

Select the correct kind of paper for the job. Always make sure to position paper
squarely and setittightly around the platen. Also make sure the printhead adjustment levei isinthe correct position (page 78). See Appendix C for paper specifica-

tions. To remove paper from the printer, use the Form Feed switch or turn the
platen knob.

Ribbon Cartridge and Printhead
Keep samples of early printouts to help you know when to replace the ribbon car-

tridge and printhead. Use only Digital-approved ribbon cartridges in the printer.

Other cartridges may not give the same performance and may damage the printer. See page 102 for information on how to replace the ribbon cartridge and page
108 for information on how to replace the printhead. See Table 5-1 for tips on how
to know when to replace the ribbon cartridge and printhead ur when to contact

your service representative.

Store ribbon cartridges and printheads in their containers in the same environment as the printer (Appendix C).

Maintaining the Printer

CORRECTING SIMPLE PROBLEMS
Table 5-1, Troubleshooting Checklist, shows you how to correct many simple

printer problems without calling for service. Always check this table before caliing for service.
if you have a problem, foliow these steps.

1. Find the description of the problem on the Troubleshooting Checklist.
2.

Read the probable causes for that probiem.

Follow the suggested solutions for each probable cause.

NOTE:

Theprobablecausesarelistedinthe orderof what:s mostlikely to be the

cause, to what is least likely to be the cause.
if you cannot find your problem in the checklist, or if you cannot solve the
problem, follow these steps.

Turn the power switch to 0 (off).

Do nottry to make internal repairs.

Contact the nearest Digital service center, or your sales representative.
Appendix B describes Digital's repair and support services.

Maintaining the Printer

Table 5-1

Troubleshooting Checklist
Probable Cause

Suggested Solution

Printer does not

Power source is

Check power at outlet.

start when you

defective

Problem

No Power

turn power on.

Power cord is not

Check power cord

connhacted or is

connections.

broken.

Check power cord for
damage.
Fuse is blown.

Replace fuse (page 112).
if the fuse blows again, call
Digital service.

No Printout
Ready indicator

Printer communi-

Cheack cable connections

is lit, but the

cations cable

at the printer and

printer is not

is not installed

computer.

printing.

correctly.
Protocol setting

Power off printer.

mav be incorrect.

Power on printer and

choose protocol setting
to match printing

application.

Ready indicator

Printer is off-

Prass the Ready switch

is off. Fault

line.

to put the printer

indicator is off.

on-line.

open.

Close the access cover.
Press Ready.

Printer is out of

Reload paper,

is lit

paper, or paper

then press Ready.

but not

is not ingserted

blinking.

correctly.

Carriage

Printhead carriage

vibrates.

path is blocked.

Access cover is

Fauit indicator

Open access cover.
Remove the obstruction.

Fauit indicator

Close access cover, then

is lit.

press Ready.

Maintaining the Printer

Table 5-1

Troubleshooting Checklist (Cont)

Problem

Probable Cause

Suggested Solution

Carriage moves,

Ribbon is behind

Adjust the ribbon,

but printer

the printhead.

then press Ready.

Ribbon is not

install the ribbon,

instalied.

then press Ready.

Printhead adjust-

Check printhead

ment is too far

adjustment.

does not print.

back.

Printer does

Access cover is

Close the access cover,

not start and

open.

then press Ready.

internal problem.

Call Digital service

Ready indicator is off.
Pressing Ready does
not turn the indicator on.

When power is turned

(Appendix B).

on, the carriage stays to

the left home position and

the Fault light blinks.

Poor Printing
Print quality is poor.

Paper is not the

Use Digital-recommended

recommmended type.

paper (Appendix C).

Riobon is not the

Use Digital-recommended

recommended type.

ribbon (Appendix C).

Ribbon cartridge

Adijust or replace the

is not mounted

ribbon cartridge.

correctly; ribbon
cartridge is old or

defective.
Printhead is too

Adjust printhead

tar from paper.

adjustment lever for
single, multipart sheets
or envelopes, as required,

Printhead

Replace printhead

is defective.

(page 108).

100

Maintaining the Printer

Table 5-1

Troubleshooting Checklist (Cont)

Problem

Probable Cause

Suggested Solution

Blank spaces
(missing dots) are in

Internal failure.

Call Digital service
(Appendix B).

horizontal row of

characters.

Printhead is worn.

Replace the printhead (page
108). Also see Appendix B for
service information.

Clear paper path.

Print lines

Paper path is

overlap.

obstructed.

Printzsd pages

You have not

Check the features

have garbled

chosen the

menu stored in the

characters.

corract values

printer's memaory,

for your host

especially baud rate,

computer.

data bits and parity, and
protocol (page 85).

If necessary, reselect the

correct features and values
for your host computer

(page 84).
Printer prints

Paper release

Set the lever to the

characters ata

lever is not in

correct position {page 39).

slant, paper tears

the corrcet

or jams, or paper

position.

doas not move.

Maintaining the Printer

Tabile 5-1

Troubleshooting Checklist (Cont)
Probable Cause

Suggested Solution

Paper jams.

Paper path is

Clear the paper path.

fFault indicator

obstructed.

Problem

Paper Problems

is off.
Pinfeed paper

Adjust the paper.

holes are not seated
in the tractor pins.

Tractors are not

Unlock and move the

in the correct

tractors (page 44).

position for

Avoid stretching or

paper width.

wrinkling the paper.

Paper release

Move paper

lever is not

rolease lever

in correct

to correct

position.

Paper jams;

Paper path is

Clear paper path;

Fault indicator is on.

abstructed.

remove jammed paper.

Paper release

Move paper

lever is not

release lever

in correct

to carrect

position.

Printer stops and the

Printer is out of

Reload paper and press

Fault indicator lights.

paper.

Ready.

Internal problem.

Turn power off, then

Prassing Ready causes
the printer to print one
line.

Fauilt indicator blinks.

on. if the Fault indicator

continues to blink, call
Digital service (Appendix B).

101

Maintaining the Printer

102

REMOVING AND REPLACING THE RIBBON CARTRIDGE
WARNING:

Turn the power switch to 0 (off) before replacing the ribbon

cartridge.
1.

Remove the printer access cover.

2. Move the printhead carriage to the center of the platen.

Ma 0159 46

Maintaining the Printer

103

Pushtheribbon cartridge notches outward and pull up on the ribbon cartridge to remove it. Discard the old ribbon cartridge.

NOTE:

See Appendix A for the replacement ribbon cartridge order number.

Maintaining the Printer

104

On the new cartridge, turn the ribbon adjustment knob in the direction
indicated on the cartridge.

RIBBON

CARTRIDGE

MA 0126
86

Maintaining the Printer

105

Fittheribbon cartridge between the mounting clips on the carriage. Make
sure that the ribbon fits between the printhead and the smudge guard.
Press down on the cartridge until you hear it click into place.

NOTE:

Make sure the ribbon is secured on both the left and right sides.

SMUDGE GUARD

MOUNTING
cLp

A D127 86

Maintaining the Printer

106

Tighten the ribbon with the ribbon adjustment knob.

MA 0YJ8 8F

Maintaining the Printer

Replace the printer access cover.

Mo 0128 86

107

Maintaining the Printer

108

REMOVING AND REPLACING THE PRINTHEAD

WARNING:

NOTE:

Turn the power switch to 0 (off) before you replace the printhead.

It you have a Digital service contract, have the Field Service technician

replace the printhead.
1.

Remove the printer access cover.

2. Move the printhead carriage to the center of the platen.

L 0ha 86

Maintaining the Printer

109

3. Remove the ribbon cartridge (page 102).

4. Push the head clamp to the right and pull the printhead straight up to
remove it from the carriage. Discard the old printhead.

NOTE:

See Appendix C for the replacement printhead order number.

110

Maintaining the Printer

5. Push the head clamp to the right and insert the replacement printhead
into the connector on the carriage.

NYR
7 BE

Maintaining the Printer

111

6. Replace the ribbon cartridge (page 102).
7.

Replace the access cover.

Ma Q29 g

See Adjusting the Printhead in Chapter 3 to adjust the printhead for paper
thickness.

Maintaining the Printer

112

REMOVING AND REPLACING THE FUSE

WARNING:

Turnthe power switch to 0 (off). Disconnect the power cord from the

walil outlet and the printer.

Push the fuse holder in while turning it to the left. Remove the fuse
holder.

Maintaining the Printer

2. Replace the old fuse with a new one of equal value.

sMa N168.06

113

PAGE

114

INTENTIONALLY

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ACCESSORIES AND SUPPLIES

A wide variety of accessories and supplies (including manuals) are available to
enhance printer versatility and make operation easier. To place an order or
request a catalog, call the Digital sales office in your area during regular
business hours.

Accessories

Option Number

Description

PCXXF-CF

Acrylic desk-top stand

LAS0X-FF

Paper catcher

LAXXA-AA

Desk stand acoustic cover

H0401-A

Crossover serial switch

115

116

Accessories and Supplies

Supplies

Option Number

Description

BC16E-10

System interface cable

LAS0R-06

Nylon ribbon cartridges, 6 per box

PCXXA-AM/AB

Platen cleaner, 10 applicators per box

H9850-PA

Paper,9-1/2in X 11in, 1/2 in perforated edges, 20 b,
2700 sheets per carton

Paper,9-1/2in x 11in, 1/2 in perforated edges, 20 |b,

H9850-LR

540 sheets per pack

ADAPTERS

you

need

order

adapter

for

your computer

system

video

terminal, use the option numbers listed in Table 1-1, Interface/System Cable
Adapters. Order adapters through the DECdirect catalog.

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FIELD SERVICE INFORMATION

DIGITAL’S SERVICES
Digital provides a wide range of maintenance programs that cover small systems

and terminals. These include on-site, carry-in, and mail-in maintenance services.
You can use these programs to select a plan that meets your service needs, from

complete Digital support, to self-maintenance.

ON-SITE SERVICE
Digital ofters fast, low-cost, quality maintenance performed at your site by Digitaltrained service specialists. Whether you take advantage of our DECservice or

Basic Service Agreements, or choose our Time and Materials service, you can be
sure that your small system or terminal is getting the best possible maintenance.

CARRY-IN SERVICE
There are several hundred Digital service centers in major cities world-wide,
which offer convenient, fast, and dependable “return-to” maintenance at a savings
over on-site service.

DECmailer
iIf you are capable of self-maintenance, you should use our fast turnaround

module and subassembly repair service - DECmailer.
For more information on any of Digital's Maintenance Services, call the Digital
Field Service office in your area during normal business hours.

117

PAGE

118

INTENTIONALLY

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OPERATING SPECIFICATIONS

LA75 SPECIFICATIONS

Weight

10 kg (22 Ib)

Dimensions
Height

130 mm (5.12 in)

Width

452 mm (17.8 in)

Depth

348 mm (13.7 in)

Environment

Temperature

10°C to 40°C (50°F to 104°F)

Relative humidity

10% to 90%

Voltage. frequency
LA75-A2

120 V, 50/60 Hz

LA75-A3

240 V, 50/60 Hz

LA75-A4

220 V, 50/60 Hz

LA75-A5

100 V, 50/60 Hz

Power consumption

120 W maximum

Power receptacie

Nonswitched, 3-prong, grounded

Power cord

1.83 m (6 ft) detachable

Data interface

6-pin modular connector

119

120

Operating Specifications

System cable

Part number BC16E-10

EIA Standard RS-423
Connection to RS232C 9-pin and 25-pin printer
ports is achieved with optional adapters
Ribbon Cartridge

Part number LAS0R-06

Printhead

Part number 29-25916-00

9-pin dot matrix
Printing method

Bidirectional

Unidirectional, left to right
Forward and reverse paper motion*
Input buffer capacity

2 kilobyte (2ud8 characters)

Buffer control

XON/XOFF software protocot,

READY/OFF-LINE front panel control
Print density

Draft mode

12 X 9 matrix

(horizontal X vertical dots)

Memo mode

24 x 9 matrix

Near letter quality mode

24 X 17 matrix

Letter quality mode

36 x 18 matrix

Printing speed

Mode

Burst Speedt

Throughput Speedt

Draft

250 char/s

182 char/s

Memo

125 char/s

96 char/s

Near letter quality

42 char/s

35 char/s

Letter quality

32 char/s

26 char/s

For bottom paper feed applications, use forward motion only. Use rear

paper feed for applications requiring forward/reverse printing motions
(super/sub scripting, bolding, underlining).
t

Burst print speeds (maximum speed) are measured while printing text at 80
characters per line at 10 ¢characters per inch.

Throughput print speeds (average speed) are measured while printing text
at ten characters per inch with line spacing of six lines per inch.

Operating Specifications

Font

Courier

Characters per inch

1
10, 12, 16.5,. 17

(horizontal pitch)

(standard-width characters)
5.6.8.25.8.55

(double-width characters)
Vertical pitch

2,3,4,6,8,12 lines per inch

Character sets

U.S. ASCH

National Replacement (NRC)
(See Table 4-2 for complete list.)
ISO 8-bit supplemental

DEC suppiemental
DEC technical

VT100 Special Graphic
(line drawing)

Katakana

IBM Proprinter:

Graphic Set A
Graphic Set B

All Character Set, Symbol Drawing
Character attributes

True descenders (j, ¥y, p. g, Q)
italics

Superscript
Subscript

Shadow bold
Underline

Double underiine

Overscore

121

122

Operating Specifications

PAPER SPECIFICATIONS

Method

Paper

of Loading

Type

Width

Weight

Thickness

Rear and

Single part

108 to 254 mm

56 to 75 g/m?

bottom

pinfeed paper

4.25into 10w

15t0 20 Ib

Bottom

3-part forms

108 to 254 mm

0.30 mm or less

only

with carbon

425t0 10in

0.012 in or less

first sheet

37to 60 g/m?
i0to161b
4510 56 g/m?

copies

121015 1b
4-part forms

108 to 254 mm

0.30 mm or less

without

4.25t0 10in

0012 in or less

carbon
54 to 56 g/m?

Sheets 1-3

t45t0151b

Sheets, 4

49 to 56 g/m?
13to151b

Hand ted

Labels on

108 to 254 mm

0.30 mm or iess

carrier

4.25t0 10 in

0.012 in or less

Single sheet

254 mm or less

60 to 90 g/m?

0.05%t0 0.30 mm

{plain bond)

10 in or less

16 to 24 Ib

0.0002t0 0.012in

Envelopes

0.30 mm or less

0.012 in or less

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BASIC ESCAPE SEQUENCES

Some applications programs may require insertion of escape sequences to
activate the printer's features. The following is a list of common escape se-

quences for DEC Protocol and IBM Proprinter emulation that control these
features.

NOTE:

Make sure that the printer is set to DEC protocol when you are printing

DEC liles and Other protocol when you are printing other files.
DEC PROTOCOL
Horizontal Pitch
The following control sequences set the horizontal pitch and select singlewidth printing.

Function

Sequence

Sets pitch to

ESClw

10 char/in

ESC[O0w

;

Sets pitch to

ESC[2w

ESC1w ‘

Choose one sequence

12 char/in

Sets pitch to

ESCl4w

16.5 char/in
(changes printing to
132 columns)

Sets pitch to

ESC{11w

17.1 char/in
123

124

Rasic Escape Sequences

The following control sequences set the horizontal pitch and select double~
width printing.

Function

Sequence

Sets pitch to

ESC[5w

5 char/in

Sets pitch to

ESC{b6w

6 char/in

Sets pitch to

ESC[8w

8.25 char/in

Sets pitch to

ESC{12w

8.55 char/in

Print Dens.ly

The following control sequences generate ane of four print densities: draft,
memo, near letter quality, and letter quality.

Function

Sequence

Selects draft printing

ESC["z
ESC{0"z

ESC({1"z

Selects letter quality

ESC[272

(LQ) printing

Selects memo printing

ESC[3"2

Selects near letter quality

ESC[4"2

(NLQ) printing

Choose one sequence

Basic Escape Sequences

125

Underline, Bold, and ltalics
The following control sequences generate single or double underlines, bold or
italic letters.

Function

Sequence

Turns off bold, italics, underline, and

ESC | 0Om or none

double underline printing.
Turns on bold printing.

ESC[1m

Turns on italics printing.

ESC[3m

Turns on underline printing; turns off

ESC[4m

double underline printing, if selected.
Turns on double underline printing:

ESC([2tm

turns off underline printing, if selected.

Turns off bold printing.

ESC[22m

Turns off italics printing.

ESC{23m

Turns off underline and double underline

ESC[{24m

printing.
To use these sequences consecutively, use the following format.

ESC[Ps;..;Psm
For example, to turn on bold, italics, and underline, the sequence is as follows.

ESC([{1:3:4m

126

Basic Escape Sequences

IBM EMULATION PROTOCOL
The following escape sequences control the printing functions.

Function

Sequence

Turns on shadow bold printing.

ESCE

Turns off shadow bold printing.

ESC G

Turns on LQ or NLQ mode,
depending on menu feature setting 20.

ESCH

Turns on draft mode.

ESCIPs

You can use the following sequence to select printing mode. The Ps parameter
you select determines the printing mode.
Ps

Mode

Selects draft mode.

Selects LQ/NLQ mode.

Selects draft mode.

Uses down-line ivaded set.

Selects NLQ mode.
Uses down-line loaded set.

Sets and resets underlining.

ESC-Ps

if Ps = 1(0/1), it underlines all characters that follow this sequence.
if Ps = NUL (0/0), it turns off underlining.