Memorex 7200 User manual

7200/7300 Processing Unit
Maintenance Manual
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November 1972 Edition
Memorex Corporation
Santa Clara, California 95052
Requests for copies of Memorex publications should be made to
your Memorex representative or to the Memorex branch office
serving your locality.
This publication is provided for informational purposes. Contact
Memorex for the latest periodic enhancement.
A readers' comments form is provided at the back of this publi-
cation. If the form has been removed, comments may be
addressed to the Memorex Corporation, Publications Dept.,
Santa Clara, California 95052.
© 1972, MEMOREX CORPORATION

PAGE
TABLE Of CONTENTS
SECTlOi'J 1.
INlHOOUCTIUN ••••••••••••••••••••••••••••••••••
1- 1
S CL1P E {]f l'lJ\l~UAl • • • • • • • .• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • 1- 1
RELATION TO SUPPORT DIAGRAMS MANUAL ••••••••••••••••••••••• 1-1
DIFfEHENCES AMONG MODELS AND FEATURES ••••.•••••.•••••••.•• 1-2
SECTION 2.
INSTALLATIGN ••••••••••••••••••••••••••••••••••
SITE P J\.EP ARJ.\ TI Oi···J ••••••.••••••••••••••••••••••••••••••••••••
PRE-INSTALLATION CHECKS ••••••••••••••••••••••••••••••.•
Air Conditioning - Humidity Control •••••••••••••••••
Primary Power - facility Grounding ••••••••••••••••••
floor Preparation •••••••••••••••••••••••••••••••••••
Storage facilities ••••••••••••••••••••••••••••••••••
Sys terr. l{ecor ds ••••••••••••••••••••••••••••••••••••••
SpeciaJ Tools and Test Equiprnent ••••••••••••••••••••
Manpower Allocation •••••••••••••••••••••••••••••••••
SYSTEM C/~BLI.-JG DATA ••••••••••••••••••••••••••••••••••••
Cable Identification ••••••••••••••••••••••••••••••••
Terminations ••••••••••••••••••••••••••••••••••••••••
CabJe PJacement •••••••••••••••••••••••••••••••••••••
System Groundin9 Cab1es •••••••••••••••••••••••••••••
Input Power Transformer Adjustment ••••••••••••••••••
U j\JJJ ACJ-< I f·JG •••••••••••••••••••••••••••••••••••••••••••••••••
ASSEMBLY ••••••••••••••••••••••••••••••••••••••••••••••••••
CJ\DLE CONNECTIONS •••••••••••••••••••••••••••••••••••••••••
GHOUJW •HHE CONNECfIONS ••••••••••••••••••••••••••••••••
Pm~EH /d~D s IGI~/\L Ci\nLE corn··.JECT IUhS •••••••••••••••••••••
Power Cab)e Connections to TJ05 •••••••••••••••••••••
3010 Console Card Reader Connection •••••••••••••••••
1240 Console Connection ••••••••••••••••••••••••••••.
Peripheral Power Line (PPL) Cab1<; Connect.ion ••••••••
5120 Line Printer Connection ••••••••••••••••••••••••
8025 Card Reader/Punch Connection •••••••••••••••••••
3237 Master Tape Drive Connection •••••••••••••••••••
3664 Disc Drive Connection ••••••••••••••••••••••••••
FI Hf\l COI~NEC T1 CH~S •••• :. •••••••••••••••••••••••••••••••••
i i i
2-1
2-1
2-1
7-1
2-1
2-3
2-3
2-3
2-3
2-3
2-h
:!:-5
2-5
2-5
2-5
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7.-9'
2-10
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2-25
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lAl3LE Of C01HENTS PACE 2
?aqe
POST-INSTALLATION CHECK-OUT ••••••••••••••••••••••••••••••• 2-23
TERMINAL BLOCK CHECKS •••••••••••••••••••••••••••••••••• 2-2.1
RESISTANCE CHECKS •••••••••••••••.•••••••••••••••••••••• 2-29
VOLTAGE Ct~lECKS ••••••••••••••••••••••••••••••••••••••••• 2-30
EMERGENCY POWER OFF (EPO) CHECKS ••••••••••••••••••••••• 2-31
!>HARED RESOURCES OPERATIONAL CHECK ••••••••••••••••••••• 2-31
:.,;JSC SUBSYS lEM OPERJHIONJ\L CHECK ••••••••••••••••••••••• 2-33
1240 CONSOLE OPERATIONAL CHECK ••••••••••••••••••••••••• 2-33
0ASIC DATA CHANNEL GPERATIO~Al CHECK ••••••••••••••.•••• 2-34
SYSTEM TEST UNOEi\ ulAS CONDITIONS •••••••••••••••••••••• 2-35
INSTALLATIOi" REPUH.T ••••••••••••••••••••••••••••••••••••••• 2-35
SECTION 3. OPEkATH~G DATA AhU PROCEDURES ••••••••..••••••••
I f~lM<.UDUC TI [)jJ .............................................. .
c UL lRGLS Ai w Ii mI CJ\ rans ................................... .
OPEi·~t\ '"'fUi!, GJ-~UUlJ •••••••••••••••••••••••••••••••• ·~ ••••••••
PH.OG1{/:,J11hf.R GROUP ....................................... .
MA I l·JTENAii.JCE GROUP ...................................... .
SYSTEM ACTIVITY 8ISPLAY G~OUP ••••••••••••••••••••••••••
COhi·IUNICJUluj~.S ACTIVITY DISPLAY Gl{OUP .................. .
OPt.:HJH ING Pi{OCEUUhES ...................................... .
(;Ei·J£1{AL ••••••••••••••••••••••••••••••••••••••••••••••••
;~des of Uperation .................................. .
Lireakpoint Facility ••••••••••••••••••••••••.•••••••••
S\'·; ITCH H~G PmJER Gr~ AND OFF ............................. .
LWW I hG CUNlHOL S TOhAGE f,{lJ/'-'. DISC ...................... ..
Po\ver On Cond i t ion •••••••••••••••••••••••••.•••••••••
Upf~r a tor l'·lOd e •••••••••••••••••••••••••••..••••••••
i·)rogr am J•lode · ••••••••••••••••••••••••••••..••••••••
Reset/Load Condition ................................ .
Opera tor t··iod e .................................... .
Pro gr am 1''1od e • • • • • • • • • • • • • • • • • • • • • • • • • • • • .. • • • • • • • •
Ma in ten a nee t--·lod e ••••••••••••••••••••••••.•••••••••
LuJ\D I NG CONTf(Ol .::> TUf(AGE FR0:-1 CAHDS ••••••••••••.•••••••••
fJ0~1er Un Cond it ion •••••••••••••••••••••••••.•••••••••
Opc~r a tor i''1ode •••••••••••••••••••••••••••.•••••••••
Program /"1ode ••••••••••••••••••••••••••••.•••••••••
.&-\.es et/ Load Condit ion •••••••••••••••••••••••.•••••••••
Uperator I-iode •••••••••••••••••••••••••••.•••••••••
Program t·'lod e • • • • • • • • • • • • • • • ••••••••••••• , •••••••••
i''la int e nance i'1ode •••••••••••••••••••••••• , •••••••••
LuJUJla~G l"iJ.\h. !:>TlJRAGE FROM DISC •••••••••••••••••••••••••
Autoload Condition ••••••••••••••••••••••••••••••••••
iv
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3-1
3-1
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LUAU I NG Iii~ I.- S TU,-:.i\GE FHUt·;
Preconditions •••••• ~
rrocedure ••••••••
hd~D H~G Cl.JHi 1,dL ::::i TOiU\GE
J-Jreconditions
Procedure
Llreakpoint ~can
Displaying Contents
fih l TI i1 JG CU1 1 Jh:.uL ~ Tui,/\GE
r)r econd it ions
Procedure
i.3reakpoint Scan
Entering Data
HE/~O I NG l'-'li-\ I I\ ST U•\AGL:
Preconditions
Procedure
hh IT I NG f'lA I l,. Sl LH{J.\Gt.
i)r econd it ions
Procedure
C/\1WS
of Consecutive Locations
..... .....
1\EJ.\D I i~G ,-.fG 15lEL.S UF
Freconditions
erocedure
r\EGISTEh FILES
LUJ\Cil l~G 1\LG I~> TJ.::h,'.) uf
Preconoitions
2rocedure •••••
,·\i.:J~U H-JG H.t:G I~) lb\S ()j-"
Pr econc.j it ions
Procedure
LUJ\[J I NG iu:c I~ TEt\S
r' r econcJ it ions
Procedure
HEM~ I i~C SHJ~;u.:-:o hLSUui<CES
freconditions
t·-r oce<.l u re
LXt.CUT ING PhUChi~Ji.S
Preconditions
Procedur('
~t.Cf IUN 4.
J.~[c; I~ l[;{S
PJ\E vua I VE MA I H TEHJ\i~CE ••••••••••••••••••
... ci ,UV Ii ,G/ I hSb' l Ii .G ;·:LDLLfS •JI TH P m"wEH. U1 J
Cu1·i•jU1·JbH LLCt-\l lW·~S ..................... .
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3-30
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3-30
3-31
3-31
3-31
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3-32
3-32
3-33
3-33
3-33
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3-34
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3-36
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3

TABLE OF CONTENTS PAGE 4
REGISTER FILE ••••••••••••••••••••••••••••••••••••••••••••• 4-2
MICRO-INSTRUCTION REPERTOIRE ••••••••••••••••••••••••••.••• 4-2
MICRO-INSHWCTION FORMATS.................................. 4-6
MACHINE-LANGUAGE INSTRUCTION REPERTOIRE ••••••••••••••••••• 4-6
CODE CHAR TS • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • 4-1 6
CONVERSION TABLES ••••••••••••••••••••••••••••••••••••••••• 4-25
TOOLS AND TEST EQUIPMENT •••••••••••••••••••••••••••••••••• 4-25
SECTION 5. DIAGNOSTIC PROGRAMS ••••••••••••••••••••••••••• 5-1
SEClION 6. SHAt(EO RESUURC£S • • • • •• • • • • • • • • • • •• • • • • • • • • • • • • 6-1
GENERAL INFORMATION ••••••••••••••••••••••••••••••••••••••• 6-1
TIMING CHECKS••••@•••••••••••••••••······················· 6-8
CPU TIMit~G CHECKS •• • • • • • • • • •• • • • • •• • • •• • • • • • • • • • • • • • • • • 6-B
lnitiaJ Checks •••••••••••••••••••••••••••••••••••••• 6-8
Excursions Counter •••••••••••••••••••••••••••••••••• 6-8
Ti ming C r1a in I ••••••••••••••••••••••••••••••••• ,. • • • • 6-9
/'•lS TIMING Cj-1ECKS • •• • .. •• •••• • • •• • • •• • • •• • • •• •• •• •• •.. • • •• 6-9
Timer Delay Adjustment ·························~···· 6-9
Refresh Timing Checks··························~···· 6-1?
Timing Module Adjustments ······················~···· 6-12
SECTION 7. INTEGRATED COMMUNICATIONS ADAPTER............... 7-1
COMMAND viOHD fOHMATS .. • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • .• • • • • 7-1
LINE ADAPTER ADDRESSING ······························Q···· 7-6
RS-232C SIGNAL INTERCHANGE ·························••n••·· 7-7
SECTION 8. BASIC DATA CHANNEL • •• • • • •• • • •• • • •• • • •• • • • .. • • •• B-1
SECTION 9. INTEGRATED FILE ADAPTER ···········•••••••4••••• 9-1
vi

TAaLE OF CfHHENlS PAGE 5
SECTION 10. Pm~ER SUPPLY ••••••••••••••••••••••••••••••••• 10-1
T!ZOUBLESHOOTllJG ............................................ 10-1
FUSE CHECKS ............................................. 10-J
VOLlJ\GE CHECl<S ............................................ 10-3
SEQUENCER RELAY CHECKS ••••••••••••••••••••••••••••••••• 10-3
Version 4 Processing Units •••••••••••••••••••••••••• 10-3
Version S Processing Units •••••••••••••••••••••••••• 10-3
PHASE-LOCK MODULE SCH FIHHJG CHECKS •••••••••••••••••••• 10-l+
ALAHM C IHCU IT CHE Cl< .• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • 10-11.
J.\!J.JUS Tt·lt::•·JTS • • • • • • • • • • • .• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • 1 O-L~
ov fa~ v OL lAGE THHESHOLD AOJUS l ME nrs •••••• •••••••• •••••••• 1 0-LJ.
lr1itiaJ Conditions •••••••••••••••••••••••••••••••••• 10-4
+23 VDC Threshold Adjustmen~ •••••••••••••••••••••••• 10-5
+19 VDC Threshold Adjustment •••••••••••••••••••••••• 10-5
+5 VDC t\ Thresho Id Adjustment • •• • • • .. • • • • • • •• • • •• • • • • 10-6
+5 VDC U Threshold Adjustment ••••••••••••••••••••••• 10-7
-12, -5, -3, +3, +5, and +12 VDC Thresho1d
Adjustments ••••••••••••••••••••••••••••••••••••••• 10-7
PHASE LOCK .SCH F HUl"·JG 1-'\0JUS IMENlS • • • • • • • • • • • • • • • • • • • • • • 10- ~j
StCTIOh 11. Si'SlEt,; COh'TROL PAi~El ••••••••••••••••••••••••• 11-1
PJ-\i:El CONlHULS CHECI( •••••••••••••••••••••••••••••••••••••• 11-1
KE~OURCE ALLOCATION NETWORK CHECK ••••••••••••••••••••••••• 11-2
COhTi<OL STOHAGE /\i~D ADDRESS TABLE LOAD CHECK •••••••••••••• 11-3
PAi"-JE L LJ\dP Cl· lECK • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • 11 - 3
l 0Tl\L PJ\l: ES : 1 i_! 7
vi i

figure
2-1
2-2
2-3
2-'·
2-5
2-b
2-1
2-B
2-~
2-10
2-11
2-12
2-13
2-14
2-15
2-16
2-17
2-18
PAGE 1
LIST Of ILLUSTRATIONS
Title
Pre-InstaJJation Sequence •••••••••••••••.•••••••••
Cable Identification •••••••••••••••••••••••••••••
Processor Grounding Scheme ....................... .
Peripheral Equipment Grounding Scheme •••.•••••••••
Processing Unit Transport Dollies ••••••••••••••••
Card keader/Punch Shipping BJock •••••••••••••••••
I/U Panel ••••••••••••••••••••••••••••••••••••••••
i::..PU Distribution Panel •••••••••••••••••••••••••••
I-\ C Di s t r i bu t i on Pane J • • • • • • • • • • • • • • • • • • .. • • • • • • • • •
Peripheral Power Lines ••••••••••••••••••.•••••••••
AC Power In ••••••••••••••••••••••••••••••••••••••
8010 Console Card ~eader CabJe Connections •••••••
1240 Console Cable Connections ................... .
5120 Line Printer Cable Connections .............. .
8025 Cara 1u::auer/Puncn Cable Connections •••••••••
3237 i·iaster Tape Drive Cable Connections •••••••••
1664 Oise Drive Cable Connections •••••••.•••••••••
PPL CabJe Connections ............................ .
2-2
2-6
2-7
2-B
2-11
2-13
2-14
2-15
2-16
2-17
2-13
2-1 '..)
2-19
2-20
2-;~ 1
2- ;: '2
2-23
2-26
3-1 i"\e9 j s ter Fi I e and Associated Heg is ter i'.ddr ess cs ••• 3- 3 l
3-2 Register .Lption Address format ••••••••••.••••••••• 3-id
3-3 Kegister lJption and Associateu ;(·eqistcr J\cdress •• 3-112
4-1
4-2
4-3
b-1
6-2
6-3
6-i!
ti-5
b-b
b-l
6-<3
7-1
Component Locations, Process i n~J Unit ••••.•••••••••
P(, j·-1odu Je Layout •••••••••••••••••••••••..•••••••••
/';i cro- Instruct ion Forr.iats ••••••••••••••..•••••••••
Gray Code Counter and £-Timing ~aveforms •••••••••
f~O r IT1 a 1 pr i 0 r i t y "f i IT1 i ng • • • • • • • • • • • • • • • • • ., • • • • • • • • •
£i\F Group I head/i'1r i te Jim i ng ••••••••••••••••••••
C~ Page Organization •••••••••••••••••••..•••••••••
C~ Address Selection •••••••••••••••••••..•••••••••
MS J\ddress i ng Scheme ............................. .
Ti mer De Jay ~J2veforms ••••••••••••••••••..•••••••••
Timing Adjust~ent Potentiorreters •••••••••••••••••
HS-232C Signal Interchange ·············~·········
vi i i
G-2
6-3
6-4
6-5
6-6
6-7
6-10
6-15
l-':J

Figure
~-1
9-2
9-3
9-4
9-5
9-b
')-7
9-a
~·-9
9-10
9-11
9-12
~-13
9-14
9-15
9-16
9-17
9-18
'.J-19
10-1
LIST OF ILLUSTRATIONS PAGE
Title
hrite Command ••••••••••••••••••••••••••••
Format Write Command •••••••••••••••••••••••••
f~ead Comn1and •••••••••••••••••••••••••••••
;:~ead hi thout lransf er Command
INP Instructnon Format ••••••••
Se1ect Drive Command •••••
CS Load Command ••••
Diagnostics Command
....
Control Commands • • • • • • •••••••••••••••
~rite Hardware Status Command ••••••••
........
Write Other Status Command •••••••••••••••••••••••
Track format ••••••••••••••••• •••• • •••••••
Home J\ddress •••••••••••••••••
Kecorci Zero ~·················
....
Gaps ·····~·····························
Special Track format for CS Load Drive Zero
Write Timing 1 ••••••••••••••••••••••••••••••••
Write Timing 2 •••••
Read Timing ~····· ••••
Ph<:1se Lock SCJ\
~'Jave form
..........................
ix
~-2
9-~~
9-3
9-3
9-3
9-4
9-4
')-4
9-5
')-(;,
:J-6
·j-/
9-7
'.)- :3
;;-9
9-10
9-11
9-1 ;;
9-1 "i
1 C-1 U
2

Table
2-1
2-2
2-3
4-1
4-2
4-3
4-4
4-5
4-6
4-7
4-8
4-~
4-10
4-11
4-12
·4-13
4-lll
4-15
6-1
7-1
7-2
7-3
7-4
7-5
7-6
8-1
u-2
PAGE
LIST Of TABLES
TitJe
Sample Manpower Allocation
Resistance Checks •••••••••••••••••••••••••••e••••
ilias Testing ································q····
Preventive Maintenance Schedule ···········••u••••
fRJ Decode Branch Addresses ••••••••••••••••••••••
Machine-Language Instruction Repertoire
Arranged by Function Code ••••••••••••••••••••••
Machine-Language Instruction Repertoire
Arranged by Mnemonic ···················•••o••••
ASCII Character to MS Sit Position ••••••••••u••••
ASCII Character to Hex Equivalent ········•••u••••
ELJCOIC Character to MS Bit Position ·········"····
EBCDIC Character to Hex EquivaJent ••••••••••u••••
EBCDIC/ASCII Character Conversions ··········fl····
Ho J Jeri th Punching Codes ••••••••••••••••••••..••••
Powers of Two TabJe ·······················••ti••••
Hexadecimal/Decimal Integer Conversion Table ti••••
Hexadecimal Addition and Subtraction TabJe ••e••••
Hexadecimal MultipJ ication Table ············~····
Tools and Jest Equipment ····················~····
CPU Timing··································~····
ICA to Shared Resources (Asynchronous) ······~····
Shared Hesources to ICA (Asyncnronous) ••••••..••••
ICA to Shared Resources (Synchronous) ·······~····
Shared Resources to ICA (Synchronous) ·······~····
Line Adapter Address Bits, ER 10 and E~ lf •••••••
EIA Standard RS-232C SignaJs •••••••••••••••••••••
BLJC Device Command Codes •••••••••••••••••••••••••
BOC Register ilit Assignments •••••••••••••••••••••
Page
2-4
2-29
2-36
4-2
4-8
4-9
4-12
4-15
4-16
4-17
4-18
4-19
l~-20
4-23
4-24
4-25
4-25
4-26
6-11
7-2
7-3
7-4
7-5
7-6
7-7
8-2
8-5
~-1 IFA Register Assignments ••••••••••••••••••••••••• 9-1
10-1 f"use Chart ••••••••••••••••••••••••••••••••••••••• 10-2
10-2 Threshold Adjustment Data •••••••••••••••••••••••• 10-8
x

PAGE
PHEFACE
This manual contains instaJJation, operating, instructions, and
maintenance information for the Memorex 7200/7300 Processing Unit
for use by Memorex Field Engineers. The manual is or9anized as
'follows:
Sect ion 1, lntroduct ion,
use of the manuaJ.
Section 2, lnstalJation,
procedures for connectinq
device to the Processing
checkout procedure.
discusses the scope and intended
contains unpacking instructions,
each per i phera J suhsys terr or
Unit, and a post-insta)Jation
Section 3, Operating Data and Procedures, describes aJJ
controls and indicators on the System Control Panel, pJus
some of the more commonly used operating procedures usinq
this Panel.
Sections 4 through 11 cover maintenance of all assemblies
compr1s1ng the Processing Unit, including shared resources,
power supplies and sequencer circuits, and integrated
adapters for 1/0 processors. (Maintenance information about
a particular peripheral device connected to the Processing
Unit can be found in separate maintenance manuaJs for each
device 1 isted on the folJo\rling page.) These eight SPctions
can be divided into two general areas: "memory-Joqging
11
maintenance aids, such as instruction repertoires and
conversion tab1es, which apply to the complete Processing
Unit (Section 4 and 5); and specific maintenance information
r c 1 at i ng to each ass em bl y of the Processing Unit, such ;1s
shared resources and integrated adapters (Sections 6 ~hrouqh
. 11).
J..\s a prerequisite for making maximum use of this rranu2J, the
reader should be thoroughly familiar with the 7300 Processin0
Unit Design Des er i pt ion t'1anua J., Volumes I tilrouqh IV
(Publications Numbers 2501.001 through 2501.004).
This manual is designed for use with other related documents to
provide a complete maintenance support package for the entire
MHX/40/50 System. lhese manuals are 1isted on the folJowin0 pa0e
by both title and number. The six-digit number (xxxxxx) is an
En9ineering Part Number and the seven-digit number (xxxx.xxx) is
a PubJications Number.

PREFJ~CE PAGE
506109 MHX 7200/7300 Processing Unit Support Diagrams
Manual, Volumes 1, 2, and 3
2801.001 7300 Processing Unit Illustrated Parts Cata1og
2680.010 8010 Card Reader Model 001 Maintenance Manual
2680.020 8010 Card Reader Model 002 Maintenance Milnual
2680.030 8010 Card Reader Model 003 Maintenance Manual
2581.001 8025 Card Reader/Punch Theory of Operation/
Diagrams/Maintenance Aids
2681.001 8025 Card Reader/Punch Maintenance Manual
2881.001 8025 Card Reader/Punch IJJustrated Parts
ureakdown
2650.001 5120 Printer Maintenance Manual
2850.001 5120 Printer Diagrams/Parts List
2630.001 3237 Magnetic fape Transport Model II NRZI
Operation and Servicing Manual
.£83u.001 323/ Magnetic Tape lransport Model II NRZI
Illustrated Parts Breakdown
2645.001 3664 Maintenance Manual
203516 3664 Logic Diagrams Manual
2845.001 3664 Illustrated Parts Catalog
804~11A 1240 Maintenance Manual
2861.001 1240 Illustrated Parts Catalog
2610.002 MKX/40 and 50 Systems field Support Site P1anning
Manual
i i
2

PAGE 1
SECTION 1. INTRODUCTION
~COPE Of MANUAL
The 7200/7300 Processing Unit Maintenance Manual provides
information necessary to instaJJ, operate, and maintain the 7200
and 7300 Processing Units used in the Memorex {MRX) 40 and 50
Systems, respectively. The Processing Unit is the system central
processing unit, performing aJJ necessary computing and control
functions required by the System. The main intent of this manual
is to provide information about the Processing Unit only;
however, some details of the peripheral devices that connect to
the Processing Unit are also provided in the installation
section. Diagnostic programs referenced in this manual also check
functions of the peripheral devices as weJJ as those of the
Processing Unit. Hardware-oriented maintenance contained in this
manual, however, is restricted onJy to logic present in the
Processing Unit. Information required to maintain the peripheral
devices which are separate from the Processing Unit is found in
applicable peripheral device manuals referenced in the Preface.
t<ELJ\llON ru SUPPOI\l DIJ~GRAMS MAN.UAL
This maintenance manual has been written to complement as ~uch as
possible the MRX 7200/7300 Processing Unit Support Diaqrams
Manual to provide an integral maintenance package for the
Processing Unit. The Support Diagrams Manual contains alJ Jo~ic
and schematic diagrams for the Processing Unit, plus many
supplementary maintenance-oriented diagra~s such as block
diagrams and register formats. These drawinqs are contained in
three volumes, with the supplementary diagrams contained in the
first haJf of Volume 1 and the power schematics and Jocic
oidgrams contained in the second haJf of Volume 1, and Volume~ 2
ana 3. If a particular maintenance-oriented diagram is already in
the Support Diagrams Manual, it is not repeated here; instead, a
reference is made to the drawing in the Support Diagrams Manual
by both the drawing number and the volume in which it is located.
For information about the conventions and symbology used in the
Support Diagrams Manual, refer to the introduction in the manu;JJ.

SECTION 1
PAGE
2
DlffERENCES AMONG MODELS AND FEATURES
Maintenance information in this manual is appJ ic,lble to both the
7200 and 7300 Processing Units, Versions 4 (60 Hz only) and 5 (50
or 60 Hz), with any or alJ features present. Differences between
the 7200 and 7300 models, versions 4 and 5, and the presence or
absence of particular features are called out on applicable PC
module location maps in the Support Diagrams Ma1nual and in
appropriate locations in this manual.

PAGE
SECTION 2. INSTALLATION
This section contains information for installing the MRX/40/50
System at the customer-s site. Subjects covered are: site
preparation, unpacking, cable connections, and post-installation
checkout.
~IlE PREPARATION
PRE-INSTALLATION CHECKS
Prior to installing the system, the installation site should be
checked to verify that all facility requirements conform to those
specified in the MRX/40 and 50 Systems Field Support Site
Planning Manual and the customer-s particular site plan. These
requirements are shown in Figure 2-1 and summari7ed in the
fo11owing paragraphs.
~ir ~onditioning-- Humidit~ Control
Optimum operating conditions for the facility are 70 de~rees F
(21 degrees C) and 50% relative humidity under conditions of
actual operation. The specified temperature and humidity optimum
must be maintained at all times, including non-operating hours.
Refer to the Site Planning Manual for detaiJed specifications for
each device in a particular customer-s system.
primar~ Power - Facilit~ Groundin,g
The facility power system should conform to that specified in the
Site Planning manuaJ with special emphasis on faciJ ity grounding.
Each required receptacle should be inspected for qrounding,
electrical short, and correct phase rotation prior to turning
power on. The power system should conform in general to the
examples shown in the Site Planning ManuaJ for 60 Hz and 50 Hz
systems. Have the customer correct any input .phasing problems.

,,
CHECK AIR
CONDITIONING/
HUMIDITY
CHECK FLOOR
PREPARATION
READ
INSTALLATION
HC'TtON
•
CHECK
SAFETY
EQUIPMENT
CHECK TEST
EQUIPMENT
AND TOOLS
PREPARE MANPOWER
AND WORK
SCHEDULES
SECTION 2
'
CHECK PRIMARY
POWER/FACILITY
GROUNDING
PAGE
l
CHECI<~
STORAcie
1=ACILITIES
-------
figure 2-1. ?re-installation Seouence
2

SECTION 2
PAGE
3
FloQr PreparatiQ!!
If the facility is equipped with a raised floor, check that the
cable cutouts or raceway match the approved floor plan. If the
ar<;!a under the raised floor is used as an air plenum, make sure
the customer has adequately cleaned the area, incJuding vacuuming
if necessary. Also check that the customer has removed any sharp
edges from cable ducts to prevent personnel injuries or cable
damage. Underfloor cab1es should be installed before the units
are positioned.
Customer storage faciJ ities should be checked to insure that the
facilities are suitable for file storage and offer adequate
security and fire protection. The fSR storage area should be
checked to insure that adequate space has been provided for
equipment storage and the required number of convenience
receptacles are present.
Special_Tool~LJest ~uipment
In addition to the standard FSR tools and test equiprrent, the
following speciaJ tools and test equipment wiJJ be useful for
pre-installation checking.
• Oscilloscope, Tektronix Model 422
• AC Voltmeter (1/2% accuracy or better)
• Sling Psychrometer
• Three-foot carpenter-s Jevel
A sample guide for manpower assignments is shown in Table 2-1.
The times shown are for a system composed of three disc drives,
three tape units, one card reader/punch and one printer. The
system is assumed to have no unforeseen technical problems and
all pre-instalJation preparations are assumed to be complete. In
addition, the time estimate is based on installation by personnel
farniJ iar with the MRX/40/50 system, two men to a shift.

SECTION 2
TABLE 2-1. SAMPLE MANPOWER ALLOCATION
ACTIVITY
Supervise unloading
Unpack and position equipment
lnstalJ sub-floor cabJing
Connect cab) ing
Perform voltage checks
Perform off-) ine checks
Perform micro-diagnostics
Perform diagnostics
rerform system check
lnsta11 skins and covers
Sample System Contains:
3 Oise Drives
3 Tape Units
1 Card Reader/Punch
1 Printer
SYSTEM CABLING DATA
DURATION
4
8
8
2
6
4
8
12
4
4
PAGE
4
(HRS.)
All cables are shipped in the same container with their
respective "fkUM" unit*. The documentation supporting tt1e cable
shipment is contained in the packing Jist attached to the outside
of the processing unit shipping container.
*The "FROM" unit is the most remote device by cabl ~ng from the
Processing Unit. This convention applies to all types of cables
except primary cords and signal cabling for communications
equipment. See Section 6 of the field Support Site Planning
Manual for more details.

SECTION 2
PAGE
s
.CabJ~,9.ent if i cat ion
System cables are identi'f ied by part number tags attached near
both ends of each cable. A third tag denoting the engineering
change (EC) Jeve1 of the cable is attached near one end of the
cable (see Figure 2-2). After removing aJJ cables from their
respective cartons, check them against the shipping J ist and the
system requirements. Damaged or omitted cables should be reported
to the field manager.
The last device on the disc multiplex cable and the last device
on both selector channels (bus and tag cables) must be
terminated. The bus and tag cable terminator part numbers are
/00063 and 700064, respectively. The multiplex cable terminator
part number is 203202. Ous tag, and disc multiplexer cable
terminators are shipped inside the Processing Unit table.
Sub-floor cables must be installed prior to positioning the
equipment. Cables to be installed at floor-level should be sorted
and routed between equipment after positioning. Cables at
t1oor-Jeve1 will require protective ramps. Place bus and tag
cables so. that a dark plug wi 11 connect to a light receptacle and
vice versa (see Figure 2-2).
Sys~§!:Q!!nding CabJes
In addition to the normal grounding provided via the 1/0 and
power cables, a suppJementary ftstar" grounding must be instaJJed
on each component not powered directly from the computer.
11
Star
11
grounding refers to the physical geometry of the wirin9 scheme.
Using this technique, the computer is made the center of the
system with radiating ground wires to aJJ of the peripheral
devices involved (see figures 2-3 and 2-4).

-r-:
0
:J
NOTE:
BUI ANO TAG CABLES
MUST SE CONNECTED
-i.tGH-r9 TO -OARK ...
0
0
r
0
0
MRX
ENGINEERING CHANGE LEVSL
EC
/ 8
]
~ PART NUMBER
(/')
rn
('"')
-t
~
0
z