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Document:	Installing and Using the LA75 Companion Printer
Order Number:	EK-0LA75-UG
Revision:	2
Pages:	142
Original Filename:	ek-0la75-ug-002.pdf

OCR Text

EK-OLA75-UG-002

Installing and Using the
LA75 Companion Printer

dlilgliltiall|

EK-OLA75-UG-002

Installing and Using the
LA75 Companion Printer

Prepared by Educational Services

of Digital Equipment Corporation

1st Edition, May 1986

The reproduction of this material, in part or whole, is 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 Equip-

ment Corporation assumes no responsibility for any errors that may appear in this
document.
This equipment generates and uses radio frequency energy and if not installed pro-

perly, that is in 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 limits for a Class B computing device in accordance with the specifications in

Subpart J of part 15 of FCC Rules, which are designed to provide reasonable protection against such interference in a residential installation. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does
cause interference to radio or television reception, which can be determined by turning the equipment off 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 printer.
Move the printer away from the receiver.

Plug the printer into 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 find the booklet How to Identify
and Resolve Radio/TV Interference Problems, prepared by the Federal

Communications Commission, helpful. This booklet is available from the U.S.
Government Printing Office, Washington, DC

20402, Stock No. 004-000-00345-4.

IBM is a registered trademark of International Business Machines Corporation.
The following are trademarks of Digital Equipment Corporation, Maynard,
Massachusetts.

dlifg]itla]1 ]

DECUS

P/OS

Professional
Rainbow
RSTS

VAX
VMA
VT

DECsystem-10

MASSBUS

RSX

Work Processor

DECSYSTEM-20

PDP

DEC
DECmate
DECnet

DECwriter
DIBOL
LA

UNIBUS

VAXmate

CONTENTS

INTRODUCTION

SECTION 1
1

INSTALLING THE LA75 COMPANION PRINTER

INSTALLING THE PRINTER

Site CONSIAEratiONS ....cceeiee e
e r e aa s eenas

Checking the Contents 0f the BOX .....cucvveeiiiniiiiieee

A LOOK @t the Printer ... .o e
e e ena e

Removing the Packing Material ...

Installing the Ribbon Cartridge ...

Installing the POWer Cord ... e
e ee e e

TestiNg the Printer ...t

Connecting the Printer to a Computer System ...

Printing @ FII@ ..cue et

If You Have Difficulties Printing a File ...

SECTION 2
2

USING THE LA75 COMPANION PRINTER

PRINTING FILES

About the LA75 Control Panel ...t

Printer Operating Controls and Indicators ...........cccooeiiiiriiiiiicci
e,

Printing Files ..ot
e e e e e enrea e

Contents

LOADING PAPER

Paper Controls

...................

Loading Paper

.................

Bottom Load (Pinfeed Paper)

Rear Load (Pinfeed Paper)

Single Sheet

Adjusting the Printhead for Paper ThIiCKNESS

...

Using the Low Tear Bar

Removing the Low Tear Bar

CONFIGURING THE PRINTER

What is Configuration?

Determining the Printer’s Configuration

Set-Up Mode Controls and Indicators

Changing the Printer’'s Configuration

Value Select State
Feature Select State ..

88
.....

Saving New Values and Exiting Set-Up Mode

What Are Features and Values?
5

.. 89

MAINTAINING THE PRINTER

General Maintenance

.....

Correcting Simple Problems

Removing and Replacing the Ribbon Cartridge

102

Removing and Replacing the Printhead

108

Removing and Replacing the Fuse

112

APPENDIX A

ACCESSORIES AND SUPPLIES

APPENDIX B

FIELD SERVICE INFORMATION

APPENDIX C

OPERATING SPECIFICATIONS

APPENDIX D

ESCAPE SEQUENCES

TABLES
1-1

Interface/System Cable Adapters

3-1

Loading Methods and Types Of Paper ...,

4-1

Factory-Set Configurations

4-2

LAT75 Features, Values, and Factory Settings

5-1

Troubleshooting Checklist

...

92
98

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 is 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.

Chapter 3

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 sothat it can communicate with
your computer system.

Introduction

Chapter 5

Maintaining the Printer

This chapter tells 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 youidentify and correct simple problems 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.

e The computer system (alSo known as the host) that the printer is connected to.

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.

Section 1
Installing the LA75

Companion Printer

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 .....ccuieeiiiiii

Site CONSIAEratioNS .....ccen e
e e e e e s e s e e e e e e a e enans

A LOOK at the Printer ...
e
e e er e ee

Removing the Packing Material ...
e

Installing the Ribbon Cartridge .......c.oveiiieiii

Installing the Power Cord ... et
e e 12
Testing the Printer ...
et
r e e e e e e a e 14

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

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

Printing @ File ...one et
e e e e e e e 30
If You Have Difficulties Printing a File .......cccuuorieiiiiii

e, 30

Installing the Printer

CHECKING THE CONTENTS OF THE BOX
Unpack the LA75 and make sure you have all the items shown below. If any items
are missing or 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.

PRINTER

RIBBON
CARTRIDGE

INTERFACE

DOCUMENTATION

CABLE

PACKAGE

MA-0121-86

Installing the Printer

SITE CONSIDERATIONS
The LA75 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 WINDOW

TRACTOR
RELEASE
LEVER

BAIL BAR
PRINTHEAD
ADJUSTMENT
LEVER

TRACTOR
RELEASE
LEVER

BAIL BAR

LEVER

.,
RIBBON
CARTRIDGE

MA.0122 86

Installing the Printer

LOW TEAR

PAPER
GUIDE
PAPER COVER

INTERFACE CABLE
RECEPTACLE

ON/OFF SWITCH
POWER CORD
RECEPTACLE
MA-0123-86

Installing the Printer

Removing the Packing Material
1.

Remove the access cover.

MA- 012486

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.0183-86
A

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
MA-0126-86

Installing the Printer

Fittheribbon cartridge between the mounting clips on the carriage. Make
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

1»

MA.0127-86

Installing the Printer

Turn the ribbon adjustment knob enough to tighten the ribbon.

MA-0128-86

Installing the Printer

5.
NOTE:

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

MA.0129-86

Installing the Printer

Installing the Power Cord
1.

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

MA-0130-86

Installing the Printer

Plug the power cord into the back of the printer.

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

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).

\MA0130-86

Installing the Printer

Open the print window. Remove the paper cover.

PAPER COVER

PRINT WINDOW

\MAQ0133-86

Installing the Printer

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

NOTE:

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.

MA-0149-86

Installing the Printer

Open both tractor doors.

MA-013% 86

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-0150-86

Installing the Printer

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

NOTE:

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

pin holes can enlarge.

MA-0151-86

Installing the Printer

Pullthe paperrelease lever toward the front of the printer to set the printer
in tractor mode.

MA-0189-86

Installing the Printer

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

MA-0136-86

Installing the Printer

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

MA-0137-86

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 0138 86

Installing the Printer

11.

Replace the paper cover. Close the print window.

MA-0140-86

12.

Press and hold down the Form Feed switch, and turn the power switch

to 1 (on).

Protocol

Power

Fault

Ready

Quality

e
3 Other

Set-up

Line
Feed

Form
Feed

Hawld OO
CJNLQ

Feature

Value

Previous
MA-0139-86

Installing the Printer

13.

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

IURELUY
PUHELY
"HELL

HELL
FAY

() %+ ,—, /0123456789 : 1 <=+7@ABCLEFGHIJELMNOFERSTUVWXYZI\]
" _‘abcdefghi jk1mno
O ¥+

/0123456789 ;<{=7@ABCODEFGHIJELMNOFORSTUVWXYZLN]
" _‘abcdefghi jk 1 mnop

() ¥+ ,—, /0123456789

)%+~ /0123456789

%! () ¥+ ,— . /0123456789
O

;1=

7@ABCHEFGHIJ ELMNOFAQRSTUVWXYZIN] " _‘abcdefghi jk1mnopq

() %+ ,—./0123456789: ;<=>7C@ABCLODEFGHIJELMNOFORSTUVWXYZIN]
" _‘abcdefghi jk1mnopgr
3 -=>?CABCLODEFGHIJELMNOFORSTUVWXYZI\]
" _‘abcdefghi jk1mnopqgrs
;< =:-7@ABCOEFGHIJELMNOFQRSTUVWXYZIN]1"
_‘abcdefghi jkImnopgrst

%+, =, /01234567891 ;<=>7@ABCHEFGHIJ ELMNOFORSTUVWXYZL\N]"_‘abcdefghijkImnopqgrstu
{=>7E@ABCDEFGHIJKLMNOFGRSTUVWXYZILN]
" _“abcdefghi jklmnopgrstuv

() ¥+ ,— . /70123456789 ¢ 3<=>@ARCODEFGHIJELMNOFARSTUVWXYZI\N]
" _‘abcdefghijk 1 mnopgrstuvw

)R+, — /0123456789 1 ;< =>7CABCLHEFGHIJKLMNOFORSTUVWXYZLN\N]
" *abcdefghi jklmnopgrstuvwsx
¥+ ,-,./012345678%: ;= :>7CARCLOEFGHIJELMNOFERSTUVWXYZI\N]"
_*abcdefghijk I mnopqgrstuvawxy
+,— /0123456789

1 <=:7@ABCOEFGHIJELMNOFERSTUVWXYZLN]
" _ ‘abcdefghi jklmnopgrstuvwiy:z

/0123456789 1 ;<= PARCLDEFGHIIKLMNOFORSTUVWXYZIN]
" _‘abcdefghi jk 1 mnopgrstuvwsxyz(
—./01234%56789 : ; <=>7@ABCHEFGHIJKLMNOFERSTUVWXYZIL\]
" _ ‘*abcdefghi jklmnopgrstuvwiyz (|
/01234567893 ;=P C@ABCLOEFGHIJ ELMNOFQRSTUVRWXYZIN] " _‘abcdefahi

/0123456789

k1 mnopgrstuvwxy= (13

;<=>7ARBCLEFGHIJ ELMNOFORSTUVWXYZIN] " _*abcdefaghi jklmnopgrstuvwxyz {137

0123456789 2 3 =>7ABCLEFGHIJELMNOFORSTUVWXYZIN]
" _*abcdefghij)kImnopgrstuvwxyz (1237~
123456789 : 1 <=:7"CABCHEFGHI I ELMNOFGORSTUVWXYZLN] " _Yabcdefghi jk Il mnopgrstuvwxyz {137

23456789 1 ;<=:7@ARCODEFGHIJELMNOFARSTUVWXYZIN]
" _‘abcdefghi jkl1mnopgrstuvwiyz (123~

3456789 : 3

=>7P@ABCDEFGHIJ ELMNOFORSTUVWXYZL\N]1 " _‘abcdefghi jkImnopgrstuvwxeyz {127

' "#

456789 : 1 <=>7@ABRCDEFGHIJ ELMNOFORSTUVWXYZIN] " _*abcdefghi jklmnopgrstuvwxyz {1}~

'"#%

56789 ;<=7C@ABCDEFGHIJELMNOFORSTUVWXYZILN]
" _Yabcdefghi jk I mnopqgrstuvwxyz (1)

' "#F%Y

6789 : 1< =+"@ABCLEFGHIJELMNOFQRSTUVWXYZON]
" ‘abcdefghi gkl mnoparstuvwxyz {1237

' "H#$UY

7891 1< =:7@ABRCODEFGHIJELMNOFORSTUVWXYZIN]
" _"abcdeftghi jklmnopgrstuvwiyz {137

'"#E/%’

8% : :<=>7CARCLDEFGHIJELMNOFCORSTUVWXYZIN]
" _‘abcdefghijkimnopgrstuvwxyz {1237

'"#FL%7
(

923 i=5PEABCDEFGHIJ ELMNOFORSTUVWXYZ LN ] " __*abcdefahi jklmnopgrstuvwiyz (1)7

P #EL%7
()

: 35 =PEABCOEFGHIJELMNOFORSTUVWXYZIN]
" _‘abcdefghi jk I mnopqgrstuvwxyz (127

'"#FY%
() *

s o= EARBRCODEFGHIJELMNOFORSTUVWXYZIN]
" _tabcdefghi jkImnopgrstuvwxyz {137

" "HELL
() *+

=P EARCDEFGHIT ELMMNOF
IR &

14.

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:

If the printer does not pass the self-test, see Table 5-1,

shooting Checklist.

Trouble-

Installing the Printer

CONNECTING THE PRINTER TO A COMPUTER SYSTEM
1.

Turn the power switch to 0 (off).

MA-0130-86

Installing the Printer

Plug the interface cable into the back of the printer.

~,\

s~\~

| 7

Installing the Printer

Plug the other end of the interface cable 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.

MA-01390-86

Installing the Printer

H8571-B

TO
PRINTER

9-PIN

PORT

ADAPTER

H8571-A

25 PIN
ADAPTER

TERMINAL

P o

PRINTER

PRINTER Al

nores.ae
ADAPTERS A AND B

(D NOT SHOWN)

Table 1-1

Interface/System Cabile Adapters

Host Computer/Video Terminal

Adapter Part Number

VT100 series with printer port

H8571-A

VT200 series

H8571-B

PC100 series (Rainbow)

H8571-D

PC325 (Professional)

H8571-B

PC350 (Professional)

H8571-B

PC380 (Professional)

H8571-B

DECmate

H8571-B

VAXstation

H8571-B

NOTE:

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

has an RS232 serial 25-pin male printer port. Use the H8571-B 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 afile 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.

your

printer

still

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.

Section 2
Using the LA7S5
Companion Printer

PRINTING FILES

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

About the LA75 Control Panel ........ .o
eeer e e e e e e 32
Printer Operating Controls and Indicators .........ccooeriiiiii i 33
Printing Files ..ot
e e e e e e e e e e ee 35

Printing Files

ABOUT THE LA75 CONTROL PANEL
Inthis chapter you will learn howto use the printer’s operating controls and howto

printyour files. To print files, the control panel switches perform the functions that
appear in white letters above the switch.

Protocol

Power

Fault

Ready

Quality

o
3 Other

Set-up

aowld
C3JNLQ

Feature

Value

Line

Form

Feed

OO
Next

Previous
MA-0139-86

NOTE:

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

explained in Chapter 4, Configuring the Printer.

Printing Files

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

Fault Indicator
The fault indicator is red. It lights 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.

NOTE:

Use

Proprinter.

“Other” when you

want the

LA75

to perform

like the IBM

Printing Files

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

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 quality is controlled by what you pro-

grammed

into

the

printer's

set-up

memory,

through

software

commands.

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

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

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

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

hratt

This

printing.

example

Draft

example

Memo

1is

example

NLQ@

example

LQ printing.

Memo

This

printing.

NLQ
This

printing.

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 time.
Printing Files

NOTE:

Make sure that there is paper loaded 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 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.
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 LA75 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 follow the steps outlined in

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

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.

=T oYY g @0
o) (0]

[T 38

aY=To
[Tl o [lme=T
=T SR
SO T 41

Table 3-1

Loading Methods and Types of Paper ... 41

Bottom Load (Pinfeed Paper) ...
sn e s

Rear Load (Pinfeed Paper)

SINGIE SNEEL ...ttt

et e

seeae st e e e st s e se e e se st snestesestssenseassens 71

Adjusting the Printhead for Paper ThiCKNESS ...t /8
Using the Low Tear Bar .......

Removing the Low Tear Bar

Loading Paper

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

TRACTOR

TRACTOR
STOP

CLAMPS
TRACTOR

RELEASE
LEVER

PAPER

POSITIONERS

PAPER

RELEASE
LEVER

PLATEN

KNOB

TRACTOR
RELEASE

LEVER

BAIL BAR

LEVER

MA-0142-86

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 allow printing on a single

sheet.

Loading Paper

Bail Bar
The bail bar holds the paper againstthe platen. The red etch marks on the bail bar
indicate the print area for a standard sheet of paper. Use these etch marksto 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 unit for a push or a 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 of the paper (column 1) to line up correctly with the printhead
when it starts printing.

Loading Paper

Printhead Adjustment Lever
The printhead adjustment lever changes the printhead position to allow for differentthicknesses 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

SHEETS

MA-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.

Load 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.

Loading Paper

Bottom Load (Pinfeed Paper - Tractors in the Pull 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 slot, you must first set
the tractors in the pull position. Steps 1 through 4 tell how to setthe tractorsin the
oull position.
1.

Turn the power switch to 0 (off).

MA-0130-86

Loading Paper

Remove the access cover and the paper cover.

MA-0146-86

Loading Paper

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

MA-0177-86

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 pull position.

MA 0178 86

Loading Paper

Unlocktheclamp ontherighttractor by pullingthe clamp toward the front

of the printer.

NOTE:

Checkthatthelefttractorisagainstthe tractor stop. Ifitis 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.

MA-0134.86

Loading Paper

Open both tractor doors.

MA-0179-86

Loading Paper

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

MA-0183 86

Loading Paper

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

MA 0176 86

Loading Paper

9.
NOTE:

Insert the paper through the bottom slot of the printer.
To prevent skewing, position the paper so that it feeds straight into the bottom

of the printer.

MA-0180-86

Loading Paper

10.

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

MA 0181

Loading Paper

11.

Alignthe 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 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-0182-86

Loading Paper

12.

Adjustthe 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:

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

pin holes can enlarge.

MA-0184-86

Loading Paper

13.

Adjust the paper by pulling it down from beneath the

printer’'s bottom

slot.

MA-0185-86

Loading Paper

14.

Movethe bail bar levertoward the back of the printer so that the bail baris

against the paper and platen.

MA 0175 86

Loading Paper

15.

Replace the access cover and paper cover.

MA-0188-86

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)

[;L

=—

MA-0147-86

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 0 (off).

MA-0130-86

Loading Paper

Open the print window and remove the paper cover.

PAPER COVER

MAO0133-86

Loading Paper

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

MA-0186 86

Loading Paper

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 0187 86

Loading Paper

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

NOTE:

Checkthatthe lefttractorisagainstthe tractorstop. Ifitisnot, unlockthe

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.

MA-0149-86

Loading Paper

Open both tractor doors.

MA-0135 86

Loading Paper

Alignthe pinfeed holes on both edges of the paper with the tractor pins of

both tractors. Close the tractor door to secure the paper.
NOTE:

The redetch markson the bail barindicate the printarea for
a standard

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

MA.0150-86

Loading Paper

Adjust the 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.
NQOTE:

Ifyou stretch the paper too tightly, the side perforations will tear or the

pin holes can enlarge.

MA 0151-86

Loading Paper

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

MA-0189-86

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 paperisinthe
print position.

Replace the paper cover. Close the print window.

MA 0137 86

Loading Paper

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:

Ifthe Faultindicator does not light, the paper is too close to the platen.

Turn the platen knob toward the back of the printer until the Fault indicator
lights.

MA-0152 86

Loading Paper

CAUTION:

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

the platen.
2.

Press the Form Feed switch.
The paper automatically moves under the platen to the print position.

Protocol

Power

Fault

Ready

Quality

o 3 Other

Set-up

Line

Form

Feed

D oD -D D
CNLQ

Feature

Value

Previous
MA.0139-86

Replace the paper cover. Close the print window.

MA-0140 86

Loading Paper

Pull out the wire paper separator.

PAPER

SEPARATOR

MA-0143-86

You are now ready to print.

Loading Paper

Loading Single Sheets of Paper
(With or Without Pinfeed 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 0152-86

Loading Paper

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

autopark

feature

allows

you

back

out

only

two

pages

(65.88 centimeters, 22 inches) at a time.

MA-0167-86

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

Loading Paper

Open the print window.

Raise the paper guide and secure it in place.

Pull out the paper

separator.

MA 0173-86

Loading Paper

Move the paper release lever toward the back of the printer so thatitisin
friction mode.

Place asingle sheet of paper on the paper guide so that the paper is resting just under the platen.

NOTE:

The redetch marks on the bail barindicate the print area for a 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.

MA-0172-86

Loading Paper

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

MA 0154-86

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

Turnthe platen knob toward the back of the printer until the paperisinthe
print position.

Close the print window.

MA 0171 86

Loading Paper

Activating the Automatic Paper Feed
CAUTION:

Before performing step 1, 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.

Protocol

Power

Fault

Ready

Quality

oo 33 Other

Set-up

Line

Form

Feed

D -D -D D
CJNLQ

Feature

Value

Previous
MA-0139-86

Close the print window.

MA 0156 86

You are now ready to print on the single sheet.

NOTE:

Toreloadthe pinfeed paperafteryou 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-sheet, hand-fed paper:
e

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

For multipart paper or envelopes:
®

Pull the lever toward the front of the printer.

SINGLE
SHEETS

ENVELOPES

AND
MULTIPLE

MA-0144-86

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.

Open the print window.

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

LINE

MA 0157 86

Loading Paper

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

MA-0158-86

Close the print window.

Loading Paper

REMOVING THE LOW TEAR BAR
1.

Remove the access cover from the printer.

MA-0159-86

Loading Paper

Open the print window and slide the low tear bar off.

CONFIGURING THE PRINTER

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

What is Configuration? ...
e e e e e e e e s e e e e s ee 84
Determining the Printer’'s Configuration ..........c.cccrvriiiiiiir
e, 84

Table 4-1 Factory-Set Configurations ... 85

Set-Up Mode Controls and INdicators ........cveeeieiiciiiiiiec

e 86

Changing the Printer’s Configuration ........c.cccooiiriiiiiiiiiiccr
e 87
Value SelECt StAte .....ccueviieiiiiee ettt
re e e e e e e e e e re e eenns 88
Feature Select State ...
e e
e 88

Saving New Values and Exiting Set-Up Mode ... 89
What Are Features and ValUES? ...ttt
ee e ee e s e e e e e e 89

Table 4-2 LA75 Features, Values, and Factory Settings

Configuring 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 most important 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.

Turn the power switch to 0 (off).

Press and hold the Set-up switch while you set the power switch to 1
(on).
The LA75 prints alistof whatisin its set-up memory. Table 4-1is an example of what information is stored in set-up memory.

Press the 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

Table 4-1

Factory-Set Configurations

LA75-S

VYer=zion

Code

1.0

Value

Feature
1

Rate

4500

Bitz

g-None

Frotocol

DEC

Form

DEC

Baud
Data

and

Faraty

Length

Character

Set

Supplemental

Frint

(DEC)
Character

Density

Franter

Text

Mode

Set

(LEC)

(DEC)

{(LDEC)
Right

Margin

(DEC)

inches=s
ASCII

Supplemental

Draft

LASO

Truncate

Auto

(DEC)

Auto

(LDEC)

Auto

CAN

Control

Cancel

(DEC)

(Emulation)

0On

Code

132

Columns

Faper

Out

Rell

Slashed

Zero

Auto

Active

Auto

Fower-up

(Emulation)
(Emulation)

Character

Baud

NLE
Rate

(DEC)

Set

(Emulation)

Density

(Emulation)

Control

Functions

Columns

Zero

without

auto

bBLraphics

Dratt

Select

4800

auto

slash

LF
set

NLE

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.

Protocol

Power

Fault

Ready

Quality

o
3 Other

Set-up

Line

Form
Feed

Feed

awlJ 00O
CNLQ

Feature

Value

Previous
MA-0139-86

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

switch, the printer advances one feature or value.

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.

Configuring the Printer

Changing the Printer’s Configuration (Set-Up Mode)
NOTE:

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

set to O (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

Fault

Ready

Quality

o 3 Other

Set-up

Line

Form

Feed

Fead

D .D -D D
C3NLQ

Feature

Value

Previous
MA 0139 86

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).

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

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.
5.

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

Configuring the Printer

Value Select State
1.

Press the Value switch.

Protocol

Power

Fault

Ready

Quality

Set-up

oo -

3 Other

Line

Form

Feed

D -D-D D

Feature

CNLQ

Value

Previous
MA.-0139
.86

NOTE:

The indicator to the right of the Value switch begins flashing; the NLQ

indicator stops flashing.
2.

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

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.

Protocol

Power

Fault

Ready

Quality

oo 3 Other

Set-up

Line

Form

Feed

D - D -D D
C3INLQ

Feature

Value

Previous
MA-0139-86

NOTE:

The indicator to the right of the Value switch stops flashing; the NLQ

indicator begins flashing.

Pressthe Next switch orthe Previous switchtolistthe 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.

Protocol

Power

Fault

Ready

Quality

oo 3 Other

Set-up

Line

Form

Feed

D . D - [:] D
OONLQ

Feature

Value

Previous
MA 0139 86

NOTE:

The printer automatically returns to print mode.

Ifthe poweristurned off before the Set-up switch is pressed, no changes

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.

Whenyou are in set-up mode, you can changethe 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 setthe 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.
4.

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

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

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

develop 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 ID defines the device name used by the printer when responding
to requests from your host computer, or application software. LA50 ID
allows the printer to respond as an LA50. LA210ID allows itto respond as

an LA210. Conformance level 2 allows it to respond as a level 2 device
(functionally equivalent to LA210 printer).

Configuring 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
exceedstheright margin. Wrap printsthe characters that exceed 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 LA75 emulate, or act like, the IBM Proprinter.
14.

Paper-out bell determines if the printer will sound a bell, when it detects a
paper-out signal.

15.

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

16.

Auto line feed on CR determines whether
the printer automatically advances 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 determinesthe 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 emulation
software. It also defines the value of feature 19 (power-up density).

NOTE:

Someofthese 20featurescan beoverridden by software controls (Table

4-2).

Table 4-2

LA75 Features, Values, and Factory Settings

Feature

Software

Value

Number

Feature

Controlled

Number

Baud rate

Data bits

and parity

Protocol

Form length

*Factory-set value.

Yes

Value

110

200

300

600

1200

2400

4800*

9600

7-Even

7-0Odd

7-Space

7-Mark

8-Even

8-0Odd

8-None*

DEC*

Other

12 inches

11 inchesTM

Configuring the Printer

Table 4-2

LA75 Features, Values, and Factory Settings (Cont)

Feature

Software

Value

Number

Feature

Controlied

Number

Character set

Yes

(DEC)

Supplemental

U.S. ASCII*
Great Britain

DEC Finland

France

DEC French Canada

Germany

Italy

JIS Roman

DEC Norway/Denmark

Spain

DEC Sweden

Norway/Denmark

DEC Dutch

DEC Swiss

DEC Portugal

(Reserved)

DEC supplemental*

ISO supplemental

(DEC)

DEC technical

Katakana

Draft*

Yes

(DEC)

1
2

character set

Print density

Yes

Value

Memo

NLQ

LAS50 ID*

Printer ID

Conformance

(DEC)

level I.D.

LA210 ID

only

Conformance
Level 2

Text mode

Yes

right margin

Truncate*

Wrap

(DEC)

Auto LFon CR

Yes

(DEC)

Auto CRon LF
(DEC)

Yes

Auto LF on CR

No auto LF*

Auto CRon LF

No auto CR*

Configuring the Printer

Table 4-2

LA75 Features, Values, and Factory Settings (Cont)

Feature

Software

Value

Number Feature

Controlled

Number

CAN control

Value
Cancel control
functions*

Code (DEC)

80 or 132

Yes

-t

Kill buffer

columns (DEC)
Paper-out bell

132 columns

Yes

-l

-k

Slashed zero

-t

Yes

No auto LF*

Active character Yes

Graphics set A*
Graphics set B

Power-up densityYes

Draft*

LQ or NLQ
(Emulation)

*Factory-set value.

N —

No auto CR*

(Emulation)
20

Auto CRon LF

(Emulation)

—d

Auto CRon LF

set (Emulation)
18

Auto LF on CR

(Emulation)

Auto LFon CR

Zero with slash
Zero without slash*

(Emulation)

Off
Oon*

(Emulation)
15

80 columns*

LQ or NLQ

Select NLQ*
Select LQ

MAINTAINING THE PRINTER

This chapter describes how to keep the printer clean, replace the ribbon car-

tridge and the fuse, and install or replace the printhead. Table 5-1 is a troubleshooting checklist that can help you identify and correct simple problems and
possibly save a service call.

General MaiNtENANCE .......c..oieiiiec
et e ene e e e e e e rnnees

Correcting Simple Problems ...t

Table 5-1 Troubleshooting Checklist ...

Removing and Replacing the Ribbon Cartridge .........ccooviiiiiiiiiiiiieeen 102
Removing and Replacing the Printhead ..., 108

Removing and Replacing the Fuse

Maintaining the Printer

GENERAL MAINTENANCE
The printer does not need preventive maintenance. Clean its surface withadamp
cloth only. Clean the platen with Digital-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 set it tightly around the platen. Also make sure the printhead adjust-

mentleverisinthe correct position (page 78). See Appendix C for paper specifications. 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 prin-

ter. See page 102 for information on howto replace theribbon 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 or 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 call-

ing for service.

If you have a problem, follow these steps.
1.

Find the description of the problem on the Troubleshooting Checklist.

Read the probable causes for that problem.

3.. Follow the suggested solutions for each probable cause.

NOTE:

Theprobablecausesarelistedinthe orderofwhatis mostlikelyto 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 not try 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

connected 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-

Check cable connections

is lit, but the

cations cable

at the printer and

printer is not

is not installed

computer.

printing.

correctly.
Protocol setting
may be incorrect.

Power off printer.
Power on printer and

choose protocol setting
to match printing

application.
Ready indicator

Printer is off-

Press the Ready switch

is off. Fault

line.

to put the printer

on-line.

indicator is off.

Access cover is

Close the access cover.

open.

Press Ready.

Fault indicator

Printer is out of

Reload paper,

is lit

paper, or paper

then press Ready.

but not

is not inserted

blinking.

correctly.

Carriage

Printhead carriage

vibrates.

path is blocked.

Open access cover.
Remove the obstruction.

Fault 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.

does not print.
Ribbon is not

Install the ribbon,

installed.

then press Ready.

Printhead adjust-

Check printhead

ment is too far

adjustment.

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
on, the carriage stays to

(Appendix B).

the left home position and
the Fault light blinks.

Poor Printing
Print quality is poor.

Paper is not the

Use Digital-recommended

recommended type.

paper (Appendix C).

Ribbon is not the

Use Digital-recommended

recommended type.

ribbon (Appendix C).

Ribbon cartridge

Adjust or replace the

is not mounted

ribbon cartridge.

correctly; ribbon

cartridge is old or
defective.
Printhead is too

Adjust printhead

far 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

Internal failure.

Call Digital service

(missing dots) are in

(Appendix B).

horizontal row of
characters.

Printhead is worn.

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

Print lines

Paper path is

overlap.

obstructed.

Clear paper path.

Printed pages

You have not

Check the features

have garbled

chosen the

menu stored in the

characters.

correct values

printer’'s memory,

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 at a

lever is not in

correct position (page 39).

slant, paper tears

the correct

or jams, or paper

position.

does not move.

Maintaining the Printer

Table 5-1

Troubleshooting Checklist (Cont)

Problem

Probable Cause

Suggested Solution

Paper jams.

Paper path is

Clear the paper path.

Fault indicator

obstructed.

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

release lever

in correct

to correct

position.

Paper jams;

Paper path is

Clear paper path;

Fault indicator is on.

obstructed.

remove jammed paper.

Paper release

Move paper

lever is not

release lever

in correct

to correct

position.

Printer stops and the

Printer is out of

Reload paper and press

Fault indicator lights.

paper.

Ready.

Internal problem.

Turn power off, then

Pressing Ready causes

the printer to print one
line.

Fault indicator blinks.

on. If the Fault indicator

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

101

102

Maintaining the Printer

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.

Move the printhead carriage to the center of the platen.

MA.0159-86

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.

MA 0160 86

104

Maintaining the Printer

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

PRINTHEAD

MOUNTING
CLIP

~
I

MA.0127.86

106

Maintaining the Printer

MA-0128-86

Maintaining the Printer

Replace the printer access cover.

MA-0129-86

107

108

Maintaining the Printer

WARNING:

NOTE:

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

|Ifyou have a Digital service contract, have the Field Service technician

replace the printhead.
1.

Remove the printer access cover.

Move the printhead carriage to the center of the platen.

MA-0159-86

Maintaining the Printer

109

Remove the ribbon cartridge (page 102).

Push the head clamp to the right and pull the printhead straight up to

remove it from the carriage. Discard the old printhead.

MA 0161 86

110

Maintaining the Printer

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

MA-0162-86

Maintaining the Printer

Replace the ribbon cartridge (page 102).

Replace the access cover.

111

MA.0129-86

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

112

Maintaining the Printer

REMOVING AND REPLACING THE FUSE
WARNING:

Turnthe powerswitch to O (off). Disconnectthe powercordfrom the

wall outlet and the printer.

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

MA-0163-86

Maintaining the Printer

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

MA 0164-86

113

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

LASOX-FF

Paper catcher

LAXXA-AA

Desk stand acoustic cover

HO0401-A

Crossover serial switch

115

116

Accessories and Supplies

Supplies

Option Number

Description

BC16E-10

System interface cable

LA50R-06

Nylon ribbon cartridges, 6 per box

PCXXA-AM/AB

Platen cleaner, 10 applicators per box

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

H9850-PA

2700 sheets per carton

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

H9850-LR

540 sheets per pack

ADAPTERS
If

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.

FIELD SERVICE INFORMATION

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

andterminals. 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 offers fast, low-cost, quality maintenance performed at your site by Digital-

trained 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
If 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

OPERATING SPECIFICATIONS

LA75 SPECIFICATIONS

Weight

10 kg (22 Ib)

Dimensions
Height

130 mm (5.12in)

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 receptacle

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
Printhead

Part number LA50R-06

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 (2048 characters)

Buffer control

XON/XOFF software protocol,
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.
I

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

10, 12, 16.5, 17.1

(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. ASCII
National Replacement (NRC)

(See Table 4-2 for complete list.)
ISO 8-bit supplemental
DEC supplemental
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, ¥, p, g, Q)
Italics

Superscript

Subscript
Shadow bold
Underline
Double underline

Overscore

121

122

Operating Specifications

PAPER SPECIFICATIONS
Method

Paper

of Loading

Type

Rear and
bottom

Width

Weight

Single part

108 to 254 mm

56 to 75 g/m?

pinfeed paper

4.25into 10 in

15t0 20 Ib

Thickness

Bottom

3-part forms

108 to 254 mm

0.30 mm or less

only

with carbon

4.25t0 10 in

0.012 in or less

first sheet

37 to 60 g/m?
10to 16 Ib
45 to 56 g/m?

copies

12to 151b
4-part forms

108 to 254 mm

0.30 mm or less

without

4.25t0 10in

0.012 in or less

carbon
54 to 56 g/m?

Sheets 1-3

14.5t0151b

Sheets, 4

49 to 56 g/m?

13t0 15 Ib

Hand fed

Labels on

108 to 254 mm

0.30 mm or less

carrier

4.25t010in

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

0.0002 to 0.012 in

Envelopes

0.30 mm or less
0.012 in or less

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

NOTE:

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

DEC files 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

ESC[w

10 char/in

ESC[Ow

Choose one sequence

ESC[1w

Sets pitch to

ESC[2w

12 char/in

Sets pitch to

ESC[4w

16.5 char/in
(changes printing to
132 columns)

Sets pitch to

ESC[11w

17.1 char/in
123

124

Basic Escape Sequences

The following control sequences set the horizontal pitch and select doublewidth printing.

Function

Sequence

Sets pitch to

ESC[5wW

5 char/in

Sets pitch to

ESC[6w

6 char/in

Sets pitch to

ESC[8w

8.25 char/in

Sets pitch to

ESC[12w

8.55 char/in

Print Density
The following control sequences generate one 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[2”z

(LQ) printing

Selects memo printing

ESC[3”z

Selects near letter quality

ESC[47z

(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 [0 m 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[21m

turns off underline printing, if selected.
Turns off bold printing.

ESC[22 m

Turns off italics printing.

ESC[23 m

Turns off underline and double underline

ESC[24 m

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,

ESCH

depending on menu feature setting 20.

Turns on draft mode.

ESC I Ps

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

Mode

Selects draft mode.

Selects LQ/NLQ mode.

Selects draft raode.

Uses down-line loaded 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 seguence.
If Ps = NUL (0/0), it turns off underlining.

Digital Equipment Corporation ¢ Maynard, MA 01754