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Document:	RK8-E Handouts
Order Number:	XX-5EBF8-9D
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Pages:	39
Original Filename:	http://bitsavers.org/pdf/dec/pdp8/disc/RK8-E_Handouts.pdf

OCR Text

RKS-E Handouts

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Title
All

FIELD SERVICE TECHNICAL MANUAL
12 Bit

16 Bit

Option or Designator'

[!)I 18 Bit 01 36Bit 0

RK95

+5 VOLT FEGULATOR 5409503

/TeCh Tip
Number RK95-TT-l

Processor Applicability

81 11

I I I I

Rev
Author J. WALSH/A. MUIR
Approval HAROLD LONG Date 9/12/72

Cross Reference

The +5 volt regulator 5409503 which is used in both the RK95
and RCll/RS64 has a partially installed ECO. For some rea.son,
in a few units, some difficulty has been experienced which
results in the triggering of the crowbar.
If the crowbar
triggers and system power is not removed the heat dissipated by
the S.C.R. is sufficient to damage the regulator board.
ECO 5409503-04 was written to correct this problem. However,
due to material non-availability the ECO was never implemented
fully.
ECO 5409503-05 is a field retrofit to correct this
deficiency. This ECO will be distributed immediately at the
regional level and as soon as possible to all field offices.

Title

Processor AppJicability
All

IMPROPERLY WIRED SECTOR TRANSDUCERS

18 J111 I I I I

Author J. WALSH/A. MUIR
Approval HAROLD LONG

Rev

CPL

Tech Tip .
Number RK95-TT-2
Cross Reference
()

Date •• 9/12/72

A number of improperly wired sector transducers were produced
some time ago. We feel that our logistics system has been
purged of these defective parts, however, as a precautionary
measure, this tech tip'is being issued. Below, both types
of transducers are illustrated. Should replacement become
necessary, it is suggested that a visual inspection be made.
Improperly wired transducers should be disposed of anq replacement ordered from Maynard or respective regional stockrooms.

P/N .30 - 1(>8+2

WRONG

RIGHT

II PUBLICATION DATE SEPTEMBER, 1972

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CPL
Title

RK~5

Proce~r Applicability

(
All

I 8 III I I I I I

RK~5

Author J. WALSH/A. MUIR
Approval HAROLD LONG

Tech Tip
Number

MAINTENANCE MANUAL CORRECTIONS
Rev

RK~5-:-TT-3

Cross Reference

Date

MAINTENANCE MANUAL CORRECTIONS

• Ch. 2 Sec. 2.1: Step 6 makes reference to 3 rubber shockmount c4shions. These shock mounts are presently not being
employed. A restraint bracket is being developed and will be used
when it is available. Presently there is nothing in this area
to be removed.
Step 7 should state that the shipping bracket will be turned 180
rather than being completely removed.

Sec. 2.2 Step 4 - see correction to Sec 2.1 step 6.
Chapter 5, section 5:3.2.6 in Step 21 should be looking A7

A5Ml.

section 5.3.3.3 in Step 4, pins A8M2 and A7M2 are
called out for head selection. The should be ~8M2
and B7M2 respectively.
Step 10 calls for a ± 10% margin.
been widened to ± 25%.

This spec has

Section 5.3.4.3 Step 7 calls for 3b usec average. This
spec has been changed to 70 useS + 10 usec average.
Just as in the RK05, attempt to split the difference
between upper and lower head when performing this
adjustment.
Section 5.3.2.6 Step 22. The sweep speed should be
10 MS/DIV. Page 5- 14 figure 5-10 the sweep speed
should be 10 MS/DIV.
CPL
Tit;e

Processor Applicability
All

hEAD OSCILLATION PROBLEM

I 8 1111 I I I I

Author J. WALSH/A. MUIR
Appt'ov.' HAROLD LONG

Date

Rev

Tech Tip
Number RXg5-TT-4
Cross Reference

9/13/72

The composition of the duck bill used on the RXOS was changed.
Should this new duck bill be installed on an early model RKOS, a
head oscillation problem may be encountered to correct this
problem. See ECO H743-0001.
Page 2

Cl'L

~DmDDmU

FIELD SERVICE TECHNICAL MANUAL
12 Bit

01 16 Bit 01 18 alt OJ 36 Bit 0

All

I 8/11 I I I I I

Author

HK05

Tech TIp.,
Number RJ< 0') -'J'T- 5

Tille I{KO ,~ 1'0WEH SUPPLY filit-10VAL
Proce~sor Applicability

Option or Designator

,J •

Approv<ll II.

Rev

1"',11 ~;Il! /,.

l\lu i r

LOlltJ

Date 01)/13/72

.. Cross Reference

Wilen removing the RK05 pO\ver supply and dsst~mbly sume difficulty may
be encounterc·d.
The reasons tor lh i~; IS thv clo:;t~ tolerances between
lhl~ (Jm"'l.~r supply p<.1cku'Je, l>,Hi~ [Jj~lt'· oI:;;;vlllbly dnd chdssis.
To facilitate
removul loosen the two (2) L'.lptiv,· .. ,~r-.·\·J:; \vhich hold the front most (+15
volt) l'equlator in pL1Ct! Llnd Tl'm()vt' it.
Tlwn' should now be> enough room
to lll<Jrll~UV<'.'l· the 11742 supply fl·l.~'·'

•

Tirle

All

POSSlhLI-: MISCONNEC'rI ON 01-' NO I~~ i': C L ii'!' I: I{

Processor Applic.1bility

18 I 111

I I I I

,TeCh Tip
Number

HK05-'rT-6

Cross Reference

Author

~Vd I ::11

Rev

Approval

11.

LUI,,,

Date 1/4/7.1

An (!rror LII thl.~ DEC P~lck Print I{I-:O~-Il-l, Chd:j~i:i wiJ:inq,,'has resulted
in cl nl.inll)~r of units beill<J !.;hipped to tlw field with thE:' GE 130V MOV
incorrectly connected.
The schemcltic has been corrL:ctcd viu IX\).
'1'0 insure that drives which
you iJrt..! supporting have thi!:i MOV in correct..lJ, rn .... kl~ the following check:
(1)
(2)
(j)

(4)
(5)

Extend dri.ve fully 011 !jidt."~
Remove till." bott()1l\ Pilll,'l:;
Look behind tJ1I.~ SrillUil' motor
If the reel bocly ot till' <:1-: r-10V is pd1.111el to the
frollt P~lfll:l, it is illcon'vctll' connc'ct0d
If the red body is pdr4tlh.·1 to thL' side panel, it.
is connected corr0ctly.

The incorrect connection acro!:)!:; the RKOS spindle motor stclrting relay
is from terminal 3 to termini}l 4.
Th(' I:onnc>ct j on shouici be from termill<.1l 2 Lo terminal 4.

IPAGE

II PAGE REVISION

II PUBLICATION DATE Januclry 4, 1972
,,'

I r,

I<Kl1-c ile LOW DC LOW

Ill!

------ Processor Applicability
All

I I1 I ~ I I I I
il

,\ I

C·lul r

Approval

Jim

W..ll~;1t

HKO 5 -'f1'-7

Cross Reference

Tech Tip
Number

Author

I
Rev

Date

01/0·1/7 j

unibus AC LO and DC LO ..Ire scp..lr~t~ ~iyn~lti p~culid~ to
PDP-II oper<.1tion illlll arc Hot to bl.: cunfuscu with HKllC
Df< UUS AC LO and DC LO.
'l'h('sQ ~-i(Jnals C..lnJ)ot be tie~l
to(jether, the result if this occur~;, j~i PDP-II [Jmv'er fail
will flot work.
A popul ;lr production WI ring en-or

I.:'>

5J.yn.:ll~

[J'!I1L'l~.

wiLin~

tog~ther

elt the lJowe 1seyuence is:

llliil.Ju~

.. 'nd

conlll.!ct lhl.!se
Thc correct

From 1I7:!OI-: .Il lb" Uut tum of llll.!
cdbjn...:l Lo ,\l' l.() l")IlIl'.:ctOL- on
bot lorn pmv'c'r ('lid I" ~I h: :

AC LO:

•

['rom 1I72uE Lll L.lh· i.Jollc.1I1 (.r lhe
cabinet to lie LO connl!cto,- on
bo l to III paWl.! C t.: IIU i' l.:llc.: •

Un 1 i.J us DC LO:

Uisk Bus AC LO: Frnnl ne<-lr('st 1173'1 to AC LO COrll}(:ctor
top power cud pLtle.
Disk Bus DC LO: From ne.:lres t 1173.1 Lu OC LO connector
top pOWeL end tddle.
If the system has
and therefore, no
<-Ire th ..!n provided
must b~ installed

only RK05 disk J~ivl.::'; there are no H~34 supplies
connect-ion::. to t.be: '"UP end plate.
These signals
through the disk i)w; c<-lb l~ .:lnd RJ<ll-C ECO It. 0000 8
in the RKII-C loyic.

~ 111\ I I I I

HEAD IDENTIFICATION

Proceswr Applicability

1\11

I B

Author
Approval

.J •

II.

Rev

~'1alsh

Lonq

Date

Tech Tip
Number

RK05-T'l'-8

Cross Reference

01/04/73

The RKO,) head deSignations "up" and "down" arc derived from IBM
design.:ltions used in their moving heau disk memorics.
When the
i.lir bearing is oriented upward, the ll.!!'m "up" is employed and
when the air bearing is oriented downward, the term "down" is
used.
'l'hese designations are used throughout the moving-head
disk industry.
C.:lr(; should be exercised when cncountoring these terms, for the
"up" hC..ld is t:he head which rcads [rom the lower surface of the
disk, i.e., the head which occupies the lower position in the
carriage assembly.
The "down" hC.:ld is the head which reads from
the upper surface of the disk, i.c., the head which occupies the
upper position in the carriage assembly.
When ordering RKOS heads, usc the [011mJiPH] part numbers:
Upper head ("down" head)
Lower Head ("up" head)

Page -4-

:30-10863- 2
30-10863-1

CPL

~DmDDmD
Tille

FIELD SERVICE TECHNICAL MANUAL
12 Bit

[KJI

(R) I 18 Bit 01

36Bit

Author

I sill I I I I I

Jim Walsh

Approval Harold Lonq

LOWEl{

RK05

\ Tech TIp RK05-TT-8
Number
Cross Reference
Rev lI.

HEAD IDENTIFICATION (Continued)
Processor Applicabiltty

All

16 Bit

Option or Designator

Date 06/04/73

III.AII

30-JO/io3-01

(Cable will plug into the
physically upper set of pins
on the G180, i.e.pins 5,6,7

......_

-----:r.---~

&8)

Cable
Ill' I' J; j{

II b\ II

3U-IO/io3-02

(Cable plugs to pins 1,2,3 &4
on the G180)

••

Cable

Note: No disk malfunction will occur if the head cables are reversed.
(Indeed reversing them can be a useful troubleshooting aid) but any unit
with reversed cables will produce discs that are not program compatible
with other RK05 disk units. since the data is on the opposite side of the
disk from where it is expected. Check for correct head wiring at installation time!

.,
(PAGE

II PAGE REVISION

.. -"

UPUBLlCATlON DATE

January 1973

Title

!Tech Tip
Number

W,05 HEADS

Processor Apphubility
All

I 8 h1 I I I

Author

Rev

Jim Walsh

Approval Harold Lonn

RK05-TT-9".
Cross Reference

Date 01/04/73

An ECO tc the carriage assembly and one to th~ tailpiece of

the R/W heads involved the machining of the flat surface
where the head rests on the tang of the carriage. The new
REV head will fit in the old REV carriage assemblies. Caution
should be exercised however to insure that the pad of the head
is en a plane which is parallel to that of the disk surface.
Heads on old REV tailpieces will not fit into new REV carriage
assemblies.
New REV tailpieces can be identified by the machining marks (n
the shoulder.
See Figure 1.

~IACIiINING

it (t s S S$'

•
•
•

•
MACHINING MAinS

UI'I'I.;I{ ileAl)

Page -6-

LOWER III:AL>

·momDDmD
Title

FIELD SERVICE TECHNICAL MANUAL
12 Bit

16 Bit

I 81 11 115 1 I I I

RKOS

(1)1 18 Bit I:iJI 36Bit 0

ITech
Tip
Numbttr

Head/Disk Interference
Processor App.licability

All

CPL
Option or Desigriator

Author W.

Linton

Approval

R KO 5 - TT -10

Cross Reference

Rev
Date 7 / 1 2 / 7 3

INTRODUCTION:
Head/Disc Interference, or 1101 (frequently referred to as a head crilsh)
is a result of head contact with a disc surface.
Most commonly it is
caused by a build up of dirt on the read/write head or a foreign particle in the air streaJ:l used as a "LUBRICANT" between the head and
disc surface.
If the problem is not TOTALLY CORRECTED, it has a
propagation effect from drive to drive through pack after pack.
RECOGNITION:
!fead /f'lisc Interferance can be recognized by one or more of the following:
A.

Repetitive hard read errors.
Because of adverse propagation
effect, do nJt move any pack with this kind of error to more.
than one other drive. If errors persist, stop both drives and
remove packs that are on them (DO NOT ALLOW USE OF TIIESE PACKS
Of! OIUVES UNTIL THE PROBLHI IS FULLY RESOLVED) investigate
f u· r the r for h e ad / dis c i n t e r fer en\: e .

Uncommon noise from the disc as characterized by audible
tinkling sound.
The noise will progress to a screech.

Disc surface damage.
A pack with any of the following conditions must be replaced:
1.

Deposits or smears that cannot be totally removed with
alcohol and Kimwipes.

A concentric scratch or any scratch where the aluminum

suhstrate is visible.
NOTE:
The disc edge may have
aluminum visible and cause no problem.

iLl
IpAGE 7 OF

II PAGE REVISION

UPUBlICATION DATE

.J 1I I y,

19 7 3

[Tech Tip
Number

Ilead/Disk Interference

Title

Processor Applicability
All 18

11 1

(

I 1, I I I

Author

Approval

Cross Reference

Rev

Linton

Date 7/12/73

RKOS-TT-IO

RECOGNITION (continued)

Multiple adjacent concentric scratches regardless of length.

ImLeJded particle with trailing scratch (also called comet
tail).

Radial/diagonal scratches where aluminum substrate is exposed.

Read/Write Head Damage
1•

Dark brown or black streaks (burned oxide and/or aluminum)
anywhere on the ".. hite ceramic hea". clean the h .. ~d.
If the
head
again crashes on a known good, c 1 can dis \..:, r (. p I ace the h cad .
Discolored epoxy (normally white) at the R/W clement which
cannot he cleaned off wlth alcohol.
Other.
Bent or broken flexures can result from a prolonged
IIIJI or mishandling.
Replace any head with this type of
damage.
DO NOT· ATTLMPT REPAIH.
The ceramic head gimhal
spring is adjusted to ± 1 degree landing attitude.
If this
attitude is disturbed in ~ way. the head will consistantly
crash when loaded on the disk.

•
HECOVEHY:
A.

Inspect head and disc packs.
Determine which heads and surfaces
were involved in the crash.
Check all hcads and TOTAL pack
I ihrary for possible spreading of a general crash problem.

Heplace all damaged heads and disC packs.

Clean remaining heads.
1.

If contamination cannot be removed.
placed.

Check head loading manually for correct operation.

Page 8

the head mllst be re-

r. l' I

~DmDnmD
Title

lfead/Pisk

FIELD SERVICE TECHNICAL MANUAL
12 Bit

ILl I 16 Bit 01

RECOVERY:

Q I 36 Bit Cl

I I I

I(KO~

Tech TIp
Number

Interference

Processor Apphcdbihty

All

18 Bit

Option or Designator

Author 1\'.
Approval

Cross "Reference

Rev

Linton

RK05-TT-IO

Date 7/12/73

(continued)

Check absolute filter and disc pack filter
Replace it if necessary.

for contamination.

Clean disc pack arell "atching particularly for filings,
s h a v c d met a I, pia s tic P;I r tic I e s, etc.

In Steps F ilnJ G, the off line tester m:ly be u~cd.
Mount
a maintt~nance pack (not a cr pack) 011 the drive, rllrn power
on ;1 Jl J per mit toe am e /{ F i\ IJ Y •
T urn II owe r u f fan d c h e c ~ f () I"
oxiJe buildup on heads or other si,~n~ of head/disk interference.
If satisfactory, turn power back on and run using the off
line tester for at least IS minutes.
NOTI:
heaJs b~'ing out
of correct alignment will caU!.ie ERRORS.
Try several differc·nt
operations and correct any failure noted which cannot be
ascertained to be duq to incorrect head alignment.

Mount a C[ pack anJ check and align all

II.

If origin.1i pack on which tht: crash occured does not apJll'ar
damaged, mount it.
Turn on pOI.;er and permit to cum\.' IILADY.
Turn power off and check for signs of hcad/Ji~c intcrfl'rence.
If satisfactory, turn Jlower back. on and ensure that tht.' pack
is dUllipecl before proceeding to the next uperati;,n.

I .

Chec}.. the pack and drive thoroughly using the Jisc pack
diagno~tics.
It may be necessary to reformat the pack.
sure to run Disk Data fo~ at leaSt 15 minutes .

.1.

Inspect heads for oxide after 12 hours of run time.
If
oxide appears. determine cause and correct.
If no oxide is
visible recheck in a week.

After one week,

I. .

Un 1 e s s ill dam age d pac k san d !!...U dam age d he a d~ h a v '-' bee n r co m0 v e d fro m
the machines involved and the actual cause of the IfOT IS
d~l~rmined (when possible) an~ corrected, the prohlem WILL
reoccur in a short period of time.
Usually ~jthin a month.

heads ..

revert to PM schedule.

Ib
PAGE 9 OF

PAGE REVISION

PUBLICATION DATE

July.

1973

Tech TIp

Title

Ileall/Dis\-'

NUOl~r
---'-

IlIterferencL'

Proct:~~O( AppliCability

All

Author

Ii.

Rev

Lill/Oll

In.: () S - TT - 1 0
Cross Reff!rencl!

---------------------A pproVi\ I
Date

Ci'L

PREVENTION
I.:leaning of R/W heads.

l'ropt.. r

Ins u rea I r f j 1 t e r I n g s y s t (' III has n o l e ;1 k s .. n d f i 1 t e r S are
c I e ;11\, a d i. r t y f i I t I: r l d r i \' l' r I 1 t e r) w I 1 I I.: a II s l' C ,) II t a 11\ i II it t j 0 II
h u i 1 d u f' ;1 n d c x c e s s i v e h eat i n g 0 f the d r ) v t· U II it.

Insure no foreign particles arc being generated within a drive
J u e tow ear c illl S c J b)' i II t t'r f l' r t' n,' e h t' t h' C C II "i s k a II d elf t r j J g e
or he tween Sector slot~ and index/sct'tor t!,all~duccr.

Car e fu 1 han d lin g 0 f dis cpa c k s .
1I1I mpin g 0 f
a g a ills t e a b j n L' t S O l ' f j I e J r i v e f r u II t C U vcr s
~ector discs.

Careful

I·.

lIisk packs shoulJ he stored III the I.:OllljHlter roolll or similar
C II vir 0 n mc:: n t .
C ,I b 111 e t s t hat arc c I e iI n .. n d f r l' C () f Jus tan d
In il d t' 0 f
In t' tal
0 r o t her
fir e r l' sis t a II t mat c ria I il)' C ago Il J
~. t " rag e III .~" i II m .
Ml' tal II () \) r S II n '> u c II a c a " j II e t w 1 l i p I' 0 v ide
better protLclion.

examin;.ttion of hc .... d

loadlllg tillriflg

d i ;, cpa c" s
C;I Il h t' Il J
the

P~1

periods.

•
j:

I I'lJ J( TIN C;

Fill Ollt ..
giving the
1.

:).
.\ .

:, .
b •

7.
~.

Ficld St'rvict: I~t!port and appropriate
((llluwing information:

RKOS !>erial
. . , y s t t~ m t y p t'

site cquipmc.1t

number .

C II !i tom e r
Il a me.
Cause of daRlage (drllI'llt·" pack, bent sector disc, IIDI t'tc.)
Wa!i Jl e r 11\ a n l' n t 1 Y s tor e .I c u s t 0 111 C r I n for III OJ t ion d cst r II }' e d ?
Il i s (: p ,n: k s e ria 1 nil nt b.c r a II Ii III a n u fa c t \I r e r .
C Y I i II J e r a n J d i !> C sur rae l' d a III a g l' II .
LUl.:atillll of R/W heads rClllilC(·d ( I f any).
Dat~ of damage.

co u 1 din Ii i cat C a h Co 0 r mal con d i t ion san J s h 0 U 1 d
accordingly.
ro determine whlthcr thl' Jata
c::rror call be circumvented, move the pack to another drive
and try again.
If the operation on the second drive is
succ.·ssful and data erros are lIot t'xperienced, cuntinue with
normal operation.
If Jata error!> continue, follow this
procedure:
" 0a t a

I: r r 0 r s"

and

invc~tigateJ

Page

log ,

CPL
Option or Designator

FIELD SERVICE TECHNICAL MANUAL
12Bit ~

Title
All

Processor Applicability

I 81

NOTE:

\15\

I I I

18 Bit ~

Author

w. Linton

Approval

36Bit

RKOS

\TeCh Tip
Number RK05-TT-IO
Cross Reference
Rev
Date 7/12/73

(continued)
Successful recovery af~er trying on two drives is
highly unlikely. Moving ~his suspect pack aaain
and/or placing other packs on these suspect drives
could cause a cascade of damage to other packs
and drives since this type of repeating Data Error
failure may be indicative of physical damage to the
pack surface and/or drives.
\Tech Tip
Number RKOS-TT-ll
Cross Reference
AuthorMac Sloan/Bill Linton Rev 0
RKOS-TT-IO
Approval Jim Barclay Date 8/2/73

DISK DESTRUCTION MADE SIMPLE

,I,

Processor Applicability
All

Head/Disk Interference

REPORTING:

Title

16 Bit

I 8 I 111 151

•
(

See attached picture. Yes. the head in an RKOS (or similar) disk
drive actually "flies" closer than a finger print smudge or large
smoke particle -- let alone a spec of dust. flake of dandruff or
a hair. This may give you some idea why, when you can write your
name in the dust on the outside of the disk cartridge. you may get
disk oxide building up on the white ceramic head. Oxide build-up
on the heads causes improper head flight and ERRORS if your're lucky-CATASTROPHIC DESTRUCTION OF HEADS AND DISK if you're not.
Keep the
disk cartridge door shut and the disk in a clean bag or clean environment when not in-the drive. And that's only dirt. There are
other ways you can wreck a cartridge and/or drive; such as:

IPAGE IUF

II PAGE REVISION o II PUBLICATION DATE

July, 1973

Title

DISK DESTRUCTION MADE SIMPLE
Processor Applicability
Author Mac

A'I
"8111llsl

I I I

ITech
Tip
Number RJ<OS-TT-ll

Sloan/Bill Linton Rev 0
Date 8/2/73
ApprovaUim Barclay

Cross Reference
RKOS-TT-IO

The small foil gimble spring which holds the white ceramic head
to its support bracket is "tweeked" by the head manufacturer to ±l
degree so that the head will "land" properly on the boundary
layer of air which spins along with the disk.
NOw, if you BEND the
head in ~ way, you mess up this landing angle.
When the head
does not land right. usually one edge of the head "bites" through
the air boundary layer and dings the oxide. Usually. the head will
bounce and fly.
Occasionally, however, known to us all. the head
doesn't get up and fly -- it digs and burrows into the oxide, which
happens to be moving at about 58 miles per hour.

The disk cartridge has other paths to glory. To my knowledge. no
drive in the industry will accept a cartridge upside down.
While
this is a rather extreme case of an improperly seated cartridge.
less obviously mis-seated cartridges will cause equally spectacular
disk operation. ·DO NOT FORCE the cartridge into (qr out of) the
drive and. unless you are Westfield assembly or Field Service. do not
"realign" the cartridge receiver.
Finally. dinged disks and oxide build up on heads are rather like a
social djsease which may be transmitted by either disk or heads to
other heads or disks.
Fix the problem before mixing bad cartridges
or drives.
SO:

Disks.
Do not
Do not
Do not

Page 12

like jokes in the presence of ladies. should be kept clean.
bend heads!
rape the drive with the cartridge.
mix bad disks.

RK05

~E~DDmD
Title

All

FIELD SERVICE TECHNICAL MANUAL
12 Bit

Option or Designator

I!J I 16 Bit 13 I 18 Bit [] I 36 Bit 0

JTech Tip
Number RKOS -TT-ll

DISK DESTRUCTION MADE SIMPLE
Processor Applicability

Au~or

CPL

ANDY VEROSTIC

I 811111~ I I I .. ApprovalJIM BARCLAY

Cross Reference

Rev 0
Date 8/2/73

RKOS-TT-IO

0::

-<
<-

::c Cl
z:

.....-'e. C)
~
~o

::c

•
..-,.
0::

~
n:

a:l
LD

."-/

~~
~~

f////
PAGEREVISION

PUBLICATION DATE

August,

1973

Title
All

INSTRUCTIONS FOR USING THE RK05K-AC
ALIGNMENT CARTRIDGE
Pro~r Applicability
Author BILL LINTON

I 8 111\151 I I I

Approval ART Z INS

r:~L

Tech Tip
Number RK05-TT-12
Cross Reference
Reol 0
Date 8/2/73

I
j

The following information describes how to do an RKOS head alignment and Index/Sector timing adju~t~ent using the DEC rnad~ alignment cartridge (RKOS-AC).
These instructions will be included in
the next update of the RKOS Manual, which will be about three months
from now.

1. ALIGNMENT CARTRIDGE
Function
The RKOSK-AC Alignment Cartridge provides three tracks (track 105
plus spare tracks 85 and 125) of constant frequency data with alternating sectors recorded at displacements of +2.5 milliinches and
-2.S milliinches from the ideal track locations respectively.
When a head is aligned to specification, the readback signal sho\\ls
equal amplitudes for all. sectors (as shown when the oscilloscope
displays only two sectors and triggered by the SECtOR SIGNAL).
The
degree of amplitude inequality in alternating sectors is indicative
of the departure from exact alignment.
See figures 3 thru 9.
Sector timing data is included on these three tracks to indicate
the head gap location relative to sector pulse detection.
This data
is represented by a single pulse 70 u sec nominal following the
INDEX pulse and 10 u sec prior to the onset of head alignment data.
An additional feature.of the ~lignment cartridge is its ability to
indicate the degree of runout of the spindle.
By triggering the
oscilloscope on INDEX and displaying a complete revolution of the
disk on the display. the head may appear to be aligned at a few sector
l~cations while misaligned at others.
Such a condition is indicative
of the degree of wobble of the spindle.
Figure 1 shows a display
with negligible runout while Figure 2 shows a spindle with considerable
runout.
The amount of wobble can be determined by the amplitude
differences occurring in any adjacent pair of sector boundaries by the
same equat~ons as used for head alignment.
The acceptance criteria
for spindle runout is to be determined.

Page 14

_.-

-ira~~m~n
(,~
1 ~.' ":.::
Titl~

FIELD SErViCE TECHNICAL MANUAL
12 Bit

INSTRUCTIONS FOR USING THE RKOSK-AC
Processor Applicability
Isl1111s!

RKOS

GJl 16 Bit liJl 18 Bit liJl 36Bit 0

fiT Tr.N\IFNT_ rtll)TDTnr.;=

All

CPL
Option or Designator

I I I

Author BILL LINTON
Approval ART Z INS

\TeCh Tip
Number

RKOS-TT-12

Cross Reference

Rev

Data 8/2/73

ALIGNMENT CARTRIDGE (continued)
Alignment Cartridge Specifications
Alignment and Sector Timing Tracks:
Primary Track - IDS
Backup Tracks - 85, 125
Recorded Frequency: Nominal 720 KHz
No. of Sectors: 12
Alignment Accuracy, track 105: ! 200 u in.
Alignment Accuracy, tracks 85, 125:

300 u in.

Sector Timing: Single pulse 70usec ± 1 usec following INDEX pulse.

Figure 1
Negligible runout

--,1

-~1

Figure 2
Considerable runout.
NOTE: If this
condition exi~ts ensure that
'----~--~
mating of spindle and disk are
clean.
Improper mating can
cause such runout.

IPAGE 1 S>F

/I PAGE REVISION

II PUBLICATION DATE

August, 1973

CPL

Titla

AT Tr"HCM'r

f'An'T'nTn,.,.,

Processor Applicability

f\1I

ITeCh Tip
Number RKOS-TT-12
Cross Reference
Rav

INSTRUCTIONS FOR USING THE RKOSK-AC

I8 III Irs I I I I

Author

BILL LINTON
Approval ART Z INS

Date 8/2/73

2.READ/WRITE HEAD CHECK AND ALIGNMENT
The following procedure describes the complete read/write head
alignment.
Before attempting this alignment procedure, ensure that
the drive operates correctly and that the heads have not been contaminated by exposure to a defective cartridge.
If new heads have
been installed, it is recommended that this alignment procedure
bo peTf~r~ed 0ff-llne ~sing hnckho~rd jumpers to nave the p0si~ioner
to the alignment cylinder.
Off-line alignment is strongly recommended because of the ease of returning to the alignment cylinder
whenever the positioner has been physically moved.
However, simple
maintenance routines or an RKOS Exerciser may also he used to move
the positioner.
See Step 9.
For a simple check of the head alignment, the appropriate on-line
diagnostics mar be used; however:
DO NOT ADJUST A HEAD THAT HAS LESS THAN

IS~o

ERROR

REF STEP 11, THE FINAL ADJUSTMENT ERROR MUST NOT EXCEED 6%

To align or check the neads proceed as follows:
A~

Unplug the drive

line cord to remove power.

Disconnect the drive interface card from the electronic
module and install an M930 terminator card in its place.

Reconnect the AC line cord to apply power to the drive
and cycle the drive up to operating status.

Install an alignment cartridge on the spindle and operate
the drive in the run mode for at least 30 minutes. This
must be done to allo~ the alignment cartridge and the
drive components to achieve thermal stabilization.

Using the WTPROT switch, place the drive in the write
protect condition.

Set the oscilloscope controls as follows:

(
"age 16

~EmDDmD
Title

FIELD SERViCE TECHNICAL MANUAL
12 Bit

RKOS

(i)l 16 Bit ~I 18 Bit 01 36Bit 0

INSTRUCTIONS FOR USING THE RKOSK-AC
ALIGNMENT CARTRIDGE
Processor Applicability
Author
B ILL LINTON
Approval
81
ART ZINS

1~ 1~

CPL
Option or Designator

I I I

"
ITeCh Tip
Number

Rev

RKOS-TT-12
Cross Reference

Date 8/2/73

READ/WRITE HEAD CHECK AND ALIGNMENT (continued)
vertical
mode
=
sensitivity =
coupling =

ADD (invert CHAN 2)
20mV/div
dc

sweep
Asweep
time
trigger

500 us/div
normal

trigger
source
coupling
slope
=

external*
ac
(-) negative

* Use a 1:1 probe to connect the scope external
trigger input to A02S2 (sector)

7.
. 8.

Connect the channell probe to TP3 and the channel 2 probe
to TP4 of the G189 card.
(Use 10:1 probes) •
Ensure that the positioner track scale indicates cylinder 00.

Figure 3
a.

Error

= -100%

Larg~ misaligriment.
Head close to
CYL 104. {Further misalignment
only reduces signal on right of
screen)".

(PAGE l70F

II PAGE REVISION

I! PUBLICATION DATE

{

August, 1973

CPL

All

Tech Tip
Number

INSTRUCTIONS FOR USING TilE RK05K-AC
TRIDGE
Processor Applicability
Author BILL LINTON

Rev
D~te

Approval ART Z INS

2. READ/WRITE HEAD CHECK AND ALIGNMENT

RKOS-TT-l2
Cross Reference

8/2/73

(continued)

- - - - - - - - -----Figure 4
b. Error =-72%
Head considerably misaligned, Smaller
left amplitude indicates head position
less than CYL 105.

-----------------.- -- ._---_._Figure 5
c. Error

= -15%

Head slightly misaligned. Smaller left
amplitude indicates head position less
than CYL 105.

Figure 6
d.

Right On

Head correctly aligned at CYL 105.
Amplitudes are equal.

Page 18

--,-

-...

.x2

. - -. . ____1__~_. .

......

J ... .
...........

CPL

," . ',- '.,

r~-~'a~~D~D
~!.' _ ~

All

Option or Designator

;..~.:....o

Title

FIELD SERVICE TECHNICAL MANUAL
12 Bit

16 Bit

RK05

Ql 18 Bit QI 368it 0

\ Tech Tip
INSTRUCTIONS FOR USING THE RKOSK-AC
Number RKOS-TT-12
AT, I GNMENT CARTR~DGF
Cross Reference
Processor Applicabiiity
Re" 0
Author
BILL LINTON
Approval ART ZINS
Date 8/2/73
8

I I 1111 sl I I I
2.

READ/WRITE HEAD CHECK AND ALIGNMENT

(continued)

Figure 7
e.

.--··--'1·· .......... --"--r . . .

Error = +15%

Head slightly misaligned. Larger left
amplitude indicates head position more
than CYL 105.

Figure 8
f.

Error = +72%

Head considerably misaligned.
Larger
left amplitude indicates head position
more than CYL lOS.

Error

)(

I
T

Lr
~

Figure 9

.J_--. .

..--. -........- .-.-..-...-....-

-------4

= +100%

Large misalignment. Head ~lose to
CYt 106.
(Further misalignment only
reduces amplitude of signal on left
side of screen).

*To calculate % of error, use the following formula:
% error

IPAGE l!DF

II PAGE REVISION

= Xl -X 2

X 100

II PU8L1CATION DATE

August, 1973

CPL
Number RKOs-TT-12

Proce5$()r Applicability

All

Author

Approyal

Tech Tip

INSTRUCTIONS FOR USING THE RKOsK-AC

Tjtla

Rav 0
BILL LINTON
ART Z INS
Date 8/2/73

Cross Reference

REAP/WRITE HEAD CHECK AND ALIGNMENT (continued)
X ,X = amplitude and the resultant sign denotes the direction of
l
2
error.
A negative (-) sign inqicates that the head is back
too far.
9.

Select cylinder 105 as follows:.

NOTU:
a.

It i3 also pos3ible to perform th~ fQllowing adju5tm~nts
using the RKOs Exerciser or simple maintenance routines.

Connect backboard jumpers from A07Tl, A07C2, B07Tl or any
available ground pins to the following points:
A08EI
A08Jl
A08Cl
A08KI

CYL
CYL
CYL
CYL

ADD
ADD
ADD
ADD

6 (64)
5 (32)
3 (8)
1 (1)

A04Vl

SE L/ ROY L

Connect a jumper from B08Hl (STROBE) to BOSN2 (SECTOR PULSE).
The positioner should move to cylinder 105.
Confirm this by
observing the track scale indicator.

If the RKll/RKOs is still cabled to the processor cylinder
105 may be selected by: (1) Load address 177412 (the RKDA)
and deposit 006440
(CYL 105) then (2) Load address 177404
S
(RCCS) and deposit 000011 (Seek and Go).

For RK8E/RKOS, the following program may be used:
7000

BGN,

SEEK,

7201
6742
'1212
6746
7604
6743
6741
5206
7402
5200
3000

/
/

!
/
/
/
/
/
/
/

CLA CLL
DCLR
TAD SEEK
OLDC
LAS (0-6 = cy1, 7 = surface)
OLAG
DSICP
J14P-!
HLT
J~IP

BGN

(Change bit 9 and 10 for drive other
than 0)

Load Address
7000
Set S.R. to 6440 (for cyl addr. 105

physically lower head)
10
(or S.R. 6460 for physically upper head)
Press CLEAR, then CONTINUE

Page 20

~_a~ED~D
Title

All

12 Bit

GJI 15 Bit GJ I 13 Bit GJI 36Bit 0

INSTRUCTIONS FOR USING THE RK05K-AC
ALIGNMENT CAgTRIDGE
Processor Applicability
Author BILL LINTON

18 I dlS{

10.

FJELD SERV~CE TECHl'HCAL MANUAL

I I I

Approval ART Z INS

CPL
Option or Designator
RKOS

lTech Tip
Number RKOS-TT-12
Cross Reference
RevO
Date 8 / 2/. 73

Monitor the scope display for one of the waveforms illustrated
in Figure 3 thru 9.
Adjust the trigger level control so that
the bright horizontal line appears at beginning of sectors displayed at left of screen. This indicates that these are odd
sectors, while sectors displayed on right side of screen are
even numbered sectors. The odd numbered sector amplitudes
correspond to Xl' and even numbered, X2 in equation for % error.
If none of the illustrated waveforms appear, the head is misaligned so badly that manual manipulation of the positioner is
required.
If manual manipulation is required, perform the
following steps; if not, proceed to Step 11.
a.

Place Switch Sl (on H604) in the down or off position.

Slowly move the positioner by hand until the alignment pattern
occurs.
CAUTION:
Do not use any undue force on positioner
when manually changing track positions.

Since cylinder 85 ~nd 125 have identical patterns,
be sure that the d1splayed pattern is for cylinder 105.

Observe the track scale and note the CYlinder indication
when the "right on" 'iaveform (Figure 6) is obtained.
If the scale indicates less than lOS, the head is too
far forward in the carriage. Conversely, if the scale
indicates more than lOS, the head is back too far in
the carriage.

Loosen the clamp and adjustment screws
(Figure 10)
and move the head in the appropriate direction until
the "right on" waveform is obtained and the scale indication is slightly greater than 105.

Lightly tighten the clamp Screw and turn on the positioner
power (Sl up).

Turn the positioner power off, move the positioner fully
forward and turn on the positioner power (Sl up) to
initiate a restor~ (RTZ) operation. The positioner will
automatically return to cylinder 105 following the RTZ.

IPAGE 2lOF

II PAGE R~VISJOl'jl

1/ PUBLICATION DATE

August, 1973

)

CPL
INSTRUCTIONS FOR USING TIlE RKOSK-AC
ALIGNMENT CARTRIDGE
Processor Applicability
Author BILL LINTON
All
Approval ART ZINS
181111151
1

~TeCh Tip

Title
/
I

11.

Number

Rev

RKOS-TT-l2
Cross Reference

Date 8/2/73

If one of the illustrated waveforms is present, note the
direction in which the head must be moved to obtain
the "right on" indication.
If the head must be moved backward, 100~en the head clamp and adjustment screws and gently
push the head all the way back into the carriage.
If the
head must be moved forward. loosen only the clamp screw,
then turn the adjustment screw until the correct waveform
is obtained.
(The adjustment screw is a vernier which only
moves the head forward and should not be left torqued
down after this adjustment).
NOTE
If the positioner is moved from cylinder 105 during the
adjustment procedure, turn off positioner power (51 down)
and manually move the positioner fully forward then turn on
positioner power (51 up) to initiate a restore CRTZ)
operation. The positioner will automatically return to
cylinder 105 following the RTZ.

12.

Ground B08M2 to select the upper head and repeat the preceding steps.

13.

If available, use a torque wrench (C-IA9605893-0-0) and
tighten the head clamp screw until the wrench begins to
ratchet (55 oz/in.).
If a torque wrench is not available,
use the appropriate Allen wrench to tighten the head clamp
screw snugly, however, do not over tighten.

14.

Recheck to ensure that the clamping action did not disturb
the head adjustment.

Page 22

CPI

~. ~; ..•..
i-~~~DDmD

Title
All

FIELD SERvaC~ TECHNJCAL MANUAL
12 Bit

GJI 16 Bit (JI 18 Bit ~I 36Bit 0

INSTRUCTIONS FOR USING THE RKOSK-AC
ALIGNMENT CARTRIDGE
Processor Applicability

I 8 1111151

1 I

Author

RItt tINTON
Date
ART ZINS

Approval

LOWER HEAD ADJUSTMENT SCREW

TRACK SCALE

Option or Designator

UPPER HEAD ADJUSTMENT SCREW

RKOS

\ Tech Tip
Number RKOS-TT-12
Cross Reference
Rev
0

8/2/73

LOWER HEAD CLAMP SCREW

UPPER HEAD CLAMP SCREW

Figure 10
Read/Write Head Adjustments

IPAGE 23 0F

II PAGE REVISION

II PUBLICATION DATE

August, 1973

CPL
INSTRUCTIONS FOR USING THE RKOSK-AC
All

Processor A~pJicability

Rev

Author BILL LINTON
Approval ART ZINS

Tech Tip
r.lumber

RKOS-TT-l2

Cross Refarence

Date 8/2/7 3

3.INDEX/SECTOR TIMING ADJUSTMENT
NOTE
Heads must be aligned to track before checking sector/index
timing.

Unplug the drive AC line cord to remove power.

Disconnect the drive interface cable card from the electronic
module and install an M9"30 terminator card in 'its place.

Reconnect the AC line cord to apply power to the drive and
cycle the drive up to operating status.

Install an alignment cartridge on the spindle and operate
the drive in the run mode for at least 30 minutes.
This
must be done to allow the alignment cartridge and the.
drive components to achieve thermal stabilization.

Using the WR PROT switch, place the drive in the write
protect condition.

Set the oscilloscope controls as follows:
vertical
mode
sensitivity
coupling

A sweep
time
trigger

=
=

ADD (invert CHAN 2)
0.2V/div
dc

5 MS/dv
normal

trigger
source
coupling
slope

=
=
=

external*
ac

* Use a 1:1 probe to connect the scope external
trigger input to A02R2 (INDEX).

')\
Page 24

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FIELD SERV~CE TECHNICAL MANUAL

r~J" ~r

Tit:e

12 Bit

0l 16 Bit 0/ 18 Bit 01 36Bit 0

III 115 I I I I

INDEX/SECTOR TIMING ADJUSTMENT

Approval ART ZINS

RKOS
JTeCh Tip

INSTRUCTIONS FOR USING THE RKOSK-AC
ALIGNMENT CARTRIDGE
Processor Applicability
Author. BILL INT,ON

All 1

Option or Designator

Number

Rev

0
8/2/73

Date

RKOS-TT-12
Cross Reference

(continued)

Connect the channell probe to TP3 and the channel 2
probe to TP4 of the GIBO card.
(Use 10:1 probes).

Ensure that the positioner track scale indicates cylinder
00.

Select cylinder 105 with jumpers as follows:
NOTE
It is also possible to perform the following adjustments
using the RK05 Exerciser or simple test programs.
a.

Connect backboard jumpers from A07Tl, A07C2, or any
available ground pins to the following points.
A08EI
A08J1
A08CI
A08Kl

CYL ADD
CYL ADD
CYL ADD
CYL ADD

A04Vl

105
SEL/ROY L

6
5
3
0

(64)
(32)
(8)
(1)

Connect a jumper from B08HI (STROBE) to B08N2 (SECTOR
PULSE).
The positioner should move to cylinder 105.
Confirm this by observing the track scale indicator.

10.

Monitor the scope for a single pulse followed by data beginning 10 us following the pulse.

11.

Expand the sweep time to 10 us/div and check that the
single pulse occurs 70 ! 10 us from the start of the
sweep (figure 11).

12.

Ground B08M2 to select the upper head and check for the same
pulse tolerances as step 11.
If necessary, adjust R6
on the M7700 card (card position 2) until the average time
for the two pulses is 70 us and the 70 + 10 us individual
pulse requirement is maintained. If th~se rBquirements
cannot be met, go to step 13 or 14.
DO NOT BEND THE HEADS!

PAGE2 5

PAGE REVISION

PUBLICATION DATE

August, 1973

CPL
Tech Tip

INSTRUCTIONS FOR USING THE RK05K-AC

Title

Number

Processor Applicability

J\II

Author
Approval ART ZINS

13.

14.

Rev

RKOS-TT-12
Cross Reference
i·

Date 8/2/73

If R6 does not adjust the average of the two pulses to 70 usec.
perform the fallowing:
A.

Loosen the sector transducer screws.

If the average of the pulses is greater than 70 usec. move the
transducer towards the airduct. if less than 70 usec move
transducer away from the airduct.

Tighten the screws and perform steps 11 and 12.

If the time between the two pulses is greater than 20 usec. one or
possibly both of the heads must be replaced. DO NOT BEND THE
HEADS. The head to be replaced can only be found by trial and
error.

PIN
=TP3&TP4
SWEEP
=10 us/div
VERT SENS DO.2V/div

Figure 4 Index/Sector Waveform

(
Page 26

CPL

f~~e~ED~D

12 Bit

01 18 Bit ~r 36 Bit 0

16 Bit

RK05
ITech Tip
Number RKOS-TT-13

ECO'S 36, 37, 39 and 41
GENERAL INFORMATION

7ith~

All

FIELD SERV'CE TECHNJCAL MANUAL

Option or Designator

Processor Applicability

Author

BILL LINTON / A. VEPOSTIC

III 115 I I I I

Approval

ART ZINS

Cross Reference

Date 8/1 5/73

The purpose of this Tech Tip is to describe the Inter-relationship
between RKOS ECO's 36,37,39 and 41.

These four ECO's \iill solve some of the cartridge seating problems that are being experienced with RKOS's. Specifically
they are:
1.

Two tone cartridges
that do not seat properly
(difficult to insert or platter rubs on cartridge
case).
iCO # 37 adds a new Duck Bill to fix this.

Cartridge door opener slips underneath the access
door flap thus trapping the cartridge in the drive.
ECO # 36, by adding a rubber sleeve, raises the door
opener so that now it should not slip under the flap.

Cartridge door opener slips off the access door so
that the door tries to close when the cartridge is
seated.
ECO i 39 causes the door opener to have greater tension
against the door by adding two new springs to the door
opener.
Because of 'the new springs, ECO 41 adds a
second rubber sleeve under the door opener to keep
it from twisting.

Additional comments on the ECO's follow:
ECO

No additional comments.

iI PAGE REVISION

IlpUBLlCATIONDATE

August, 1973

Titl,g

ECO'S 36, 37, 39 and 41
(~ENER!lL

nH'n~Ml\'TTnt\J

Processor Applicability

All

I 8 llllisl 1 I I
Additional

Author BILL LINTON
Approval ART ZINS

co~ments

Rev 0

rD'

Tech Tip
Number RKOS-TT-13
Cross Reference

Date 8/15/73

on the ECO's follow:

(continued)

ECO If 37
1.

The new duck bill installed by ECO If 37 can be recognized by the fact that the DEC part number and
rev (12-10744 Rev C) is molded on the part. Therefore, you can easily recognize a drive that needs
ECO If 37.

The addition of the new cartridge posts .is for industry specification conformance. The new posts can
be recognized by the fact that Rev "B" is stamped
on them.

A new airduct and gasket are not to be installed and
therefore, will not be shipped with the kit.

The following is the procedure for installing ECO If 37.
It is included in this Tech Tip for your convenience,
a copy will be sent with the ECO kit.

Page 28

4.1

Power down the ~KOS.

4.2

Remove top and bottom covers.

4.3

Install revision "B" cartridge support posts.

4.4

Install Rev C duck bill.

4.S

The cartridge receiver alignment procedure as
printed in the Maintenance Manual stays in effect.
The two types of cartridges presently in use
( a 11 w·h i tea n d hi 0 ton ear e a Iso s 1 i g n t 1 Y
different in height, i.e., the two tone one is
generally lower than the all white ones.
In
some cases the cartridge receiver might be too tight
to insert the all ~hite cartridge. This of
course has the effect that the cartridge gets
compressed some~hat which reduces the internal
clearance.

CPT.

~·j~~ED~D
~.~~
'J;;.~.
"' ; i

t'·

FJELD SERVfCE TECHNICAL MANUAL

12 Bit
lTitle

f All

Option or Designator

GJI 15 Bit 01 18 Bit ~1 36 Bit 0

ECO'S 36, 37, 39 and 41
GENERAL INFORMATION
Processor Applicability
Author

181111151

4.5

I I I

-'TeCh Tip
Number RKOS-TT-13
Cross Reference
Rev

BILL LINTON

Approval

ART ZINS

RKOS

Date

8/15/73

(continued)
If cartridge receiver is too tight, i.e., considerable force is needed to insert the cartridge
bend it open so a white cartridge slides in easily
(this is only to be used as an emergency procedure).
Do not get disturbed by the fact that two tone
cartridges have a lot of vertical play inside the
cartridge receiver.
After alignment of cartridge
receiver, make absolutelY sure there is about .010
to .040 inch clearance between the bottom of the
cartridge and the two longitudinal rails of the
cartridge receiver at & point close to the linear
positioner (dimension "A" on page 5-36 of Maintenance
Manual). Note the manual defines .020 to .040 inch.
The cartridge, when resting inside the drive is suspended by three points:
two support posts and the
lower slot of the duckbill. The only purpose of the
cartridge receiver is to guide the cartridge into
position and to apply vertical pressure to the
cartridge when it is seated •. The cartridge receiver
is not supposed to restrain the cartridge in any
way.
It has to give the cartridge freedom to assume
the three point location, hence, clearance "A" is
needed underneath the cartridge.

ECO It 39
1.

When 39 is installed, ECO 41 must also be installed.

ECO II 41
1.

Ii ECO 39 and 41 are installed there is no need to order
ECO 36 since ECO 41 will be sp.nt with two rllhber sleevp.~
DEC PIN 7411271, thus 41 incoruora~es ECO 36.

It is anticipated that the parts for these ECO's will be available by the first week in August.

PAGE

PAGE REVISION

PUBLICATION DATE

August, 1973

Title

ECO'S 36, 37, 39 and 41 GENERAL INFORr.1ATION

All

Processor Applicability

Author

L,I,J I I I

Approl/al

BILL LINTON
ART ZINS

Rev

Tech Tip
Number

CPL
RK05-TT-13
Cross Reference

Date 8/15/73

I
I

Please note that all four of these ECO's could be installed
at the same time.
Since there is no major disassembly or extensive parts installation required in any of these four ECO's,
it is racomme~Jed that ~ll four be installed ~t t~e same time.
Alternatively ECO 36 or ECO 37 or ECO's 39 and 41 may be installed at separate times.
Your choice is naturally going to
depend on your particular situation.
If you have any further questions about this T~ch Tip or the
four TICO's, please call Bill Linton or Andy Verostic in Maynard
at extensions 3242 or 2916.

PAGE 30

(