Intel iSBC 655 Quick user guide

iSBC 655
SYSTEM CHASSIS
HARDWARE REFERENCE MANUAL
ManualOrder Number:9800709A
I
Copyright ©1978 Intel Corporation
Intel Corporation,3065 Bowers Avenue,Santa Clara,California 95051
I

Intel Corporation makes no warranty of any kind with regard to this material, including, but not
limited to, the implied warranties of merchantability and fitness for a particular purpose. IntelCor-
porationassumesnoresponsibility for any errors that may appear in this document.Intel Corpora-
tion makes nocommitment to update nor to keep current the information containedin this docu-
ment.
No part of this document may be copied or reproduced in any form or by anymeans without the
prior written consent of Intel Corporation.
ICE
INSITE
INTEL
INTELLEC
iSBC
LIBRARY MANAGER
MCS
MEGACHASSIS
MICROMAP
MUL TIBUS
PROMPT
RMX
UPI
~SCOPE

This manual provides general information,installation instructions,principles
of op ration, and service information for theiSBC655 System Chassis. Additional
infor ation is available in thefollowing documents:
• Int l iSBC 635 Power SupplyHardwareReference Manual, Order No. 9800298.
• Int l iSBC 604/614 Cardcage HardwareReference Manual, Order No. 9800708.

CONTENTS
CHAPTER 1 I
~~:~~~~:~~'J~~'~~~~?~"""'".~~~~
Chassis DescriptiOn. . . . . .. . . . . .. . . .. . . . ...... . ... 1-1
Documentation Sup lied 1-2
Equipment .Supplie.1 1-2
UserSupphed EqUl ment 1-2
Specifications 1-2
CHAPTER 2
PREPARATIO FOR USE
Introduction 2-1
Unpacking and Ins ection 2-1
InstallationconSidlations2-1
Power Requireme ts 2-1
Cooling Requirem nts2-1
Rack Mounting .. 2-1
PhysicalDGnension 2-3
Multibus DescriPtiol' .. . . . . .. . . . ............. ... 2-3
Multibus Priority 2-3
Multibus and Auxili y Connectors2-3
CHAPTER 3
PRINCIPLES OF OPERATION PAGE
Introduction 3-1
Functional Description. . .. . ...................... 3-1
Front Panel Switches and Indicators 3-1
Line Voltage Select Switch and Line Fuse 3-1
Fans 3-1
iSBC 604 Cardcage and Backplane 3-1
iSBC 635 Power Supply. .. . . . . .. . . .. .. . . . . .. . .. 3-2
Power Fail Status. . . . ...... . .. .......... . . ... 3-2
Output Voltage Adjustments 3-2
CHAPTER 4
SERVICE INFORMATION
Introduction 4-1
Service and Repair Assistance 4-1
Removal and Replacement 4-1
Power Supply RemovaL 4-1
Cardcage/Backplane Removal 4-2
Indicator Lamp Replacement. ..... .. .. .. . . . . . .. 4-2
Service Diagrams 4-2
Replacement Parts Listing 4-2
TABLE TITLE PAGE
1-1.Specificatio s 1-2
2-1.Multibus Connector Pin Assignment 2-4
2-2. P2 Connectc r Pin Assignment. . . . .. .. . .. 2-5
TABLE TITLE PAGE
2-3. Compatible Bus Connectors 2-6
4-1.Replacement Parts Listing 4-2
4-2.Manufacturer's Codes 4-3
ILLUSTRATIONS
FIGURE ~TITLE PAGE
1-1.iSBC 655 S ternChassis 1-1
2-1.iSBC 655 Diensions 2-2
2-2. Serial Prioriy........................... 2-3
2-3. Parallel Priority. . . . ...... .. . . .. . . . . .. . .. 2-4
4-1.Main Frame Assembly (Sheet 1 of2) 4-5
4-1.Main Frame Assembly (Sheet2 of2) 4-7
4-2. Wmng Dia
g
[= 4-9
FIGURE TITLE PAGE
4-3. Sub Panel Assembly 4-11
4-4. Display Board Assembly 4-13
4-5.Display Board Schematic 4-15
4-6.Cardcage Assembly 4-17
4-7.Backplane Schematic 4-19
4-8.AC Power Harness ................. . . .. 4-21
4-9.Outline Dimensions 4-23

CHAPTER 1
GENERAL INFORMATION
The iSBC 655 Syste Chassis (figure 1-1) is packaged
as a completelyasse bled microcomputer chassis.It
consists of a po er supply, a four slot card-
cage/backplane, du I fans, anda frontpanel.This
chapter providesaleneral descriptionof the chassis
in addition to a spec fications table.
1-2. CHASSIS DESCRIPTION
The iSBC 655 System Chassisis designedto be rack
mounted, using RItTMA compatible components.
The 19 inch front J1lanelhas the following switches
and indicators:aporer ON/OFF indicator switch; a
RESET switch; an NTERRUPT switch;a RUN in-
dicator; and a HA T indicator. The rear panel is
easily removed for q ick access to the cardcage.
The two cooling fans are located on the left side of
the chassis, one directed toward thepowersupply
and the other directed toward the cardcage. These
fans supply adequate ventilation to keep the fully
loaded chassiswithin temperaturetolerance «55°C).
The chassisutilizesthe iSBC604 Cardcage-
Backplane for housing a maximum of four Intel
iSBC compatible boards. The backplanemay be ex-
tended to additional external cardcages or monitored
through a Multibus plug located on thebackplane.
Output power isfurnished bythemodular iSBC 635
Power Supply. The supplyismounted directly
behind the front panel and iseasily removed or
calibrated.Accepting either 100,115, 215, or 230
Vac, the supply provides fully regulatedand pro-
tected +12,+5,-12 and -5 volt outputs.A power
line monitor signal is also provided for use with
power-down subroutines.

The fopowing Hardware Reference Manuals are sup-
plied ~ith the iSBC 655 System Chassis:
1. iSIC 655 System Chassis HardwareReference
M nual Order Number 9800709.
2 is C 604/614 Cardcage HardwareReference
~Inual Order Number 9800708.
3 ISfC 635 Power SupplyHardware Reference
Minual Order Number 9800298.
A ChafiS wiring diagram, front panel logicdiagram,
and re lacement parts listing are located inChapter 4
of this manual.Similar diagrams and parts listings
pertaiing to the power supply and cardcage are_
locatein the Service Informationchapters of the
other anuals.
Thef lowing equipment is suppliedwith the iSBC
655 Sytern Chassis: front panelwith switches and in-
dicators, two fans, power supply, cardcage-
backplane, fuse, line filter,115 Vacpower cord, and
one 25 inch RS232 I/O cable.
All rack mounting hardware isuser supplied.
Chapter 2describes proceduresfor mountingand
lists recommended parts.If the chassisisoptioned
for 230volt operation,thepower cordis not sup-
plied. Any I/Ocables, with the exception of the
RS232 cable described in section 1-4, arealso user
furnished. The hardware referencemanual for each
iSBCboard will provide a table of compatible I/O
connectors recommended byIntel (not all boardsre-
quire I/Ocables, however).
Specifications of the iSBC655 SystemChassis are
listed in table 1-1.
PHY SICAL CHARACTERISTICS
f- eight
48.3 em(19 in.) at front panel
43.2 em (17 in.)behind front panel
ELEfTRICAL CHARACTERISTICS
Ir put Frequency
Output Current Over-Voltage
Voltage Current
(Max)
Limit (Max)
Protection
-
+12 2.0 amp 2.4amp + 14 to + 16 volts
+ 5 14.0 amp 16.8amp + 5.8 to + 6.6 volts
- 5 0.9amp 1.1amp -5.8 to -6.6 volts
-12 0.8amp 1.0amp -14 to -16 volts
Lire Regulation
Load Regulation

Operating Tempelature
Non-operating Te~perature

CHAPTER 2
PREPARATION FOR USE
This chapter providps instructions forunpacking,in-
stallation and initi
t
setup of the iSBC655 System
Chassis. The user s ould bethoroughly familiar with
the contents of this hapter before applying power to
the chassis.
Inspect the shipping carton immediatelyupon receipt
for evidence of mi handling during transit.If the
shipping carton is s verelydamaged or waterstained,
request that the car ier's agent be present when the
carton is opened. If the carrier's agent is not present
whenthe carton is opened and the contentsof the
carton are damage , keepthe carton and packing
material for the agelt's inspection.
For repairs to a product damaged in shipment, con-
tact the Intel TFhriical Support Center (see
paragraph 4-2) to btain a Return Authorization
Number and furthe instructions. A purchase order
willbe required to c<Dmpletetherepair.A copyof the
purchase order shohld be submittedto the carrier
withyourclaim.
It is suggested that alvageable shippingcartons and
packing material be aved forfutureuse in the event
the product must be riPPed.
2-3. INSTALLA~ION CONSIDERATIONS
TheiSBC 655 chassi,isdesigned for 19 inch RETMA
rack mounting.Fi ure 2-1 illustratesall relevant
outline dimensions.Before chassisinstallation, the
user should be familar with paragraphs 2-4 through
2-8.
2-4. POWER REQUIREMENTS
The chassis is ·eqUi~pedwith the iSBC635 Power
Supply. This pow~r supplyrequiresone of the
following four AC i?put voltages: 100,115, 215,or
230, all ± 10070. Frequency range ofthe power supply
is 47 to 63 Hz. The dhassis isshipped in the 115 volt
configuration. Instr~ctionsfor converting the power
supply to one of ~~e other voltages are given in
chapter 2 of the iSBr; 635 Power Supply Hardware
Reference Manual (['de, No. 9800298).The powe,
supply is designed to handle up to four fully loaded
iSBC boards. Refer to the above mentionedmanual
for complete specifications.
2-5. COOLING REQUIREMENTS
The chassis, without expansion boards dissipates
about 4.13 kilogram calories of heat per minute
following warmup. Adequate cooling (maintain
temperature below 55°C) for the chassis and four
iSBC boards is provided by the two chassis fans.
Care should be exercised during installationto pre-
vent obstruction of chassis air flow openings.
The chassis is designed for installation instandard
19" RETMA racks using Chassis-Track C-300-D-122
Pivot Slides with alternate T-bar handles, or
equivalent.
When using slides other than Chassis-Track
C-300-D-122, the maximum slide width is
1.7 inches. Failure to comply mayresult in
damage to the System.
To mount Chassis-Track slides on the iSBC 655
chassis proceed as follows:
1. Remove and reinstall the front fan using four 1/4
x 7/16 inch spacers under the fan. (Spacers used
should be Amatom Electronic Hardware, Part
No. 9227-AI40 or equivalent.)
2. Mount the slides on the chassis usingmounting
hardware supplied with the slide.
3.When using slides other than Chassis-Track drill
holes according to the manufacturer's instruc-
tions.
When drilling new holes, ensure all metal fil-
ings and chips are removed from the interior
of the chassis before turn-on.Use a vacuum
cleaner for optimum results.
4. After the chassis has been mounted, secure it in
the cabinet with two No. 10-32 round head
machine screws.

- ,oo~ ,.,=1
. II 300 I
o
CONNECTORS
= = = ===
00
==== =
_1,·50
--
SIDE VIEW
Figure 2-1.iSBC 655 Dimensions (Inches)
709A-2

The physical dime sions of the iSBC655 System
Chassis are shown i figure 2-1.
The iSBC 655 Syst m Chassis is equipped with the
iSBC604 Cardcag /Backplane. This card cage ac-
comodates up to fo r iSBC boardsand has an exten-
sion plug for attach ent to additionalexternal card-
cages. The backpla e conforms to the Intel Multibus
specification. Thes signals and pinnumbers are
referenced in tabl 2-1. Some IntelSingle Board
Computers use co nector P2 for additional signals
and battery backu .These assignments arelisted in
table 2-2.
The iSBC 655 can be used with master boardsin
either a serial or parallel priority scheme A master
priority methodsmust be implemented, or the boards
in the card cage will not interact.
In the serial method,priority isresolved by board
placement.Slot 12 (top slot) hasthe highest priority
and 15 the lowest.To implement this method, a
jumper must be installed between wire wrap posts B
and N on the etch side of the backplane. This is il-
lustrated in figure 2-2. In this scheme a maximum of
three master boards may be used.
To initiate a parallel priority scheme, a priority
resolver network is required.Boards such as the iSBC
80120 and 80/30 mayuse thisnetwork. A typical
hookup of this type is shown in figure 2-3.
2-10. MULTIBUS AND AUXILIARY
CONNECTORS
board is defined as a board whichis capableof ac- Recommended compatible busconnectors for PI and
quiring and control ing the Multibus.One of the two P2 are listed in table 2-3.
HIGHEST LOWEST
PRIORITYPRIORITY
MASTER MASTER
J2 J3 J4
~
BPRNI
~
BPRNI
~
BPRNIBPROIAND BPRNIPINS
NOT USED BY NON-
MASTERS.
BPROI
~~~
BPROIBPROI
'--
-
,~
CEHiSBC604
Ml Ll
BACKPLANE
Kl (BOnOMI
-=--=- -=-
709A-3
Figure 2-2. Serial Priority

NO.1 NO.8
NO.2PRIORITY NO.7 PRIORITY
PRIORITY (HIGHEST)PRIORITY(LOWEST)
J2J3J4 J5
15 15 1515 BPRNI
BPRNIBPRNIBPRNI
(NOTE)(NOTE)(NOTE) (NOTE)
18 BREQI18 BREDI18 BREDI18
BRED;
----- ---- ----- ----
- 1 ~:gK6~~ANE
I
B A C 0
HG
I (BOnOM)
L----- ---- ----- ----
_J
BUS
PRIORITY
RESOLVER
BREDIINPUTS I
FROM MASTERS
IN iSBC 614
I
BPRNI
OUTPUTS
TO MASTERS
IN iSBC 614
COMPONENT SIDE) CIRCUIT SIDE)
PIN MNEMONIC DESCRIPTION PIN MNEMONIC DESCRIPTION
1GND Signal GND 2 GND Sig GND
3 +5V + 5Vdc 4 +5V +5Vdc
POWER 5 +5V + 5Vdc6 +5V + 5Vdc
SUPP IES 7 +12V +12Vdc 8+12V+12Vdc
9-5V - 5Vdc 10 -5V - 5Vdc
11 GND Signal GND 12 GND Signal GND
13 BCLKIBusClock 14 INITIInitialize
15 BPRNI Bus Pri.In 16 BPROIBus Pri.Out
BUS 17 BUSYI Bus Busy 18 BREQIBus Request
CONTROLS 19 MRDCI Mem Read Cmd 20 MWTCI Mem Write Cmd
21 IORCI1/0Read Cmd 2210WCI 1/0 Write Cmd
23 XACKIXFER Acknowledge 24 INH11 Inhibit 1 disable RAM
25 AACKIAdvance Acknowledge 26 INH21Inhibit 2 disable ROM
27 BHENI Byte High Enable 28AD101
29 CBRQICommon BusRequest30 AD111Address
31 CCLKIConstant Clk32 AD121Bus
33 INTAIIntrAcknowledge 34 AD131
J<

iSBC 655
Preparation For Use
Table 2-1.Multibus Connector Pin Assignment (Continued)
(COMPONENT SIDE) (CIRCUIT SIDE)
PIN MNEMONIC DESCRIPTION PIN MNEMONIC DESCRIPTION
f,
INT6/Parallel 36 INT7/Parallel
INT4/ Interrupt 38 INT5/Interrupt
INTERRUPTS INT2/Requests 40 INT3/ Requests
INTO/42 INT1/
~3 ADRE/44 ADRF/
11
ADRC/46 ADRD/
ADRAIAddress 48 ADRB Address
ADDRESS ADR8/ Bus 50 ADR9/ Bus
ADR6/52 ADR7/
h~
ADR4/ 54 ADR5/
ADR2/ 56 ADR3/
57 ADRO/' 58 ADR1/
t
DATE/60 DATF/
DATC/ 62 DATD/
DATA/ Data 64 DATB/ Data
DAT8/ Bus 66 DAT9/ Bus
DATA 67 DAT6/ 68 DAT7/
69 DAT4/ 70 DAT5/
,1DAT2/ 72 DAT3/
3DATO/ 74 DAT1/
5 GND Signal GND 76 GND SignalGND
1
7-10V2-10Vdc78 -10V2-10Vdc
POWER 79 -12V -12Vdc80 -12V -12Vdc
SUPPLIES 81 +5V + 5Vdc 82 +5V +5Vdc
I
~~
+5V + 5Vdc 84 +5V +5Vdc
GNDSignal GND 86 GND Signal GND
Notes:
1.ADRO/ is equi alent to BLEN (positive true)when usedon 16 bit systems.
2. Not used on MULTIBUS.
(COMPONENT SIDE) (CIRCUIT SIDE)
PIN MNEMO~IC DESCRIPTION PIN MNEMONIC DESCRIPTION
1 GND Signal GND2 GND Signal GND
3VCCB + 5VBattery 4 VCCB + 5V Battery
5VCCPP + 5V PulsedPower 6VCCPP + 5V Pulsed Power
7VBBB - 5V Battery 8 VBBB - 5V Battery
9pUPa/ Pulsed Power Off10 Reserved
11 VDDB +12VBattery 12 VDDB +12V Battery
13 PFSR/Power Fail Sense Reset14 Reserved
15VAAB -12VBattery 16 VAAB -12V Battery
17PFSN/ Power FailSense 18 ACLO AC Low
I

C :>MPONENT SIDE) CIRCUIT SIDE)
PIN MNEMONICDESCRIPTION PIN MNEMONIC DESCRIPTION
19 PFINI Power Fail Interrupt 20 MPROIMemoryProtect
21GNOSignal GNO 22 GNOSignal GNO
23 +15V+15V 24 +15V +15V
25 -15V-15V 26 -15V -15V
27 28 HALTI Bus Master HALT
29 30 WAITIBus MasterWAITSTATE
31 32 ALE Bus Master ALE
33 34 Reserved
35 36 Reserved
37 38 RESETIReset switch
39 40
41 Reserved 42
43 44
45 46 Reserved
47 48
49 50
51 52
53 54
55 56
57 58
59 60
Notes:
1.If possible,on slave boards, PFINshould beconnected toINTO .
2.All undefined pins are reserved for future use.
OfCenters Connector
Function Pins Inches Type Vendor Vendor #Intel
Multi1busCOC VPB01 E43000A1
Con ector 43 86
0.156 Soldered'MICRO PLASTICS MP-0156-43-BW-4
(P1)ARCO AE443WP1 N/A
Less Ears
I
VIKING 2VH43/1AV5
Multi
JUS COC VFB01 E43000A1
Conr ector 4386
0.156 Wirewrap2COC VPB01E43AOOA1 MOS985
(P1) VIKING 2VH43/1AV5
Auxil ary
Conr ector 3060
0.1 Soldered'TI H312130 N/A
(P2) VIKING 3VH30/1JN5
A)
UXI ary
Connector 3060
0.1Wire wrap2COC VPB011 B30AOOA2 N/A
(P2) TI H311130
Not s:
1. Connectorheights are not guaranteed to conform to Intel packaging equipment.
2. Wirewrappin lengths are notguaranteed toconform to Intel packaging equipment.
3.CAUTION:Ensure the connectoryou are ordering fits your design needs.Verify part numbers with vendors.
2-6

CHAPTER 3
PRINCIPLES OF OPERATION
3-1. INTROD~CTION
This chapter descIjbes thebasic functional operation
of the iSBC 655 System Chassis. Most of the in-
formation in this 0rapter centers around the opertion
of the front panel,Discussion of the powersupplyis
covered in a seprrate publication, the iSBC 635
Power SupplyHardware Reference Manual,Order
Number 9800298.
Thechassisfuncti9nal components includethe front
panelwith switche$andindicators, two cooling fans,
powersupply,fo~r slotcardcage/backplane, and a
domestic (l15 vIt) power cord. The following
paragraphs descri e themajor componentsof the
chassis.
I
3-3. FRONT PAlNEL SWITCHES AND
INDICATqRS
Three switches reside on the iSBC 655front panel:
the power ON/OFF indicator/switch, the RUN
switch, and the HALT switch.
I
The power ON/OFf indicator/switch(SI) is located
on the leftside of tHe frontpanel.When power isap-
plied, the indicator willilluminate. Theilluminator
bulb is accessed by pullingoff thetranslucent switch
cap.
The other two froIljtpanelswitchesaremomentary
rocker types, labeled RESET (S3) and INTERRUPT
(S4). The RESET ~witchis wiredtopin 14 of the
backplane. When d(jpressed, the switch generates the
RESET /signal, which is synonymous with IN IT/on
the backplane. The (lip-flopwhich actually generates
RESET /is located dm the front panel printed circuit
board (PCB), and is showninfigure 4-5.
TheINTERRUPT s~itch functions in a similar man-
ner. Whenthe switfhis depressed,circuitry on the
front panel PCB generates the INTl/signal,which is
wired to pin 42 of tHe backplane (refer tofigure 4-2).
TheRUN and HALTindicatorsarelight emitting
diodesmounted on thefront panel PCB.The RUN
andHALTindicatdrs illuminate asa function of
threestatus signals: ~AIT/,HALT/,and ALE.The
RUN indicator illu~inateswhen the CPU is exe-
cuting an instruction. The indicator will be off when
the CPU is in the WAIT state or a HALT instruction
has been executed.
The HALT indicator illuminates after the CPU has
executed a HALT instruction. A front panel RESET
or an INTERRUPT will remove the HALT state.
Notice that when the CPU isin the WAIT state
neither the RUN nor the HALT indicators are on.
The illuminator circuitry is shown in figure 4-5.
3-4: LINEVOLTAGE SELECT SWITCH
AND LINE FUSE
The line voltage select switch is adjacent tothe card-
cage fan, and is shown schematically in figure 4-2.
The switch has two positions, corresponding to the
two usable line voltages; 115 VACand 230VAC. A
keyed switch locking plate securesthe switch in one
position. The switch can be set to the otherposition,
onlyby loosening the two plate hold-down screws,
and flipping the plate over.Each side of the plate is
labeled.
Fuse F 1 is located on the rear chassis panel,right
side. A 2.5 ampere fuseshould be used for 230 volt
operation and a 5 ampere fuse isused for 115 volt
operation.
The line filter is located directly below the fuse.The
line filter hardware also functionsas the power cord
connector.
The chassis utilizes two fans for coolingpurposes.
Both are located on the power ON/OFF switch side
of the chassis. Air flow is directed into the chassis,
with one fan cooling the power supply and the other
cooling the cardcage. Power for each fan is derived
directly from the line voltage.
3~.~BCW4CARDCAGEAND
BACKPLANE
The cardcage houses a total of four iSBC boards.
Considered part of the cardcage, the backplane is a
printed circuit board with Multibusand other con-
nectors attached.Operating voltages reach the
boards via the backplane and all interboard com-
munication occurs on the Multibus.

Signal terminator resistorsare located on the
backpl nePCB,and are shown schematically in
figure -7.
An ad itional connector,J5A, is installed on the
backpl ne to accommodate several status signalsand
auxilia y RAM refresh power.
This p wer supplyprovides regulated DC voltages
(+12, 12, +5, & -5) from 100,115,215 or 230 VAC
power ources. Outputlevels are delivered through
keyed onnectorswhich mate directly to the front
panel ndbackplane. All outputs have current
limitin and overvoltage protection. These tolerances
are listed in the Specifications section of the iSBC 635
Hardware Reference Manual
3-8. POWER FAIL STATUS. The power supply
is equipped with anAC line monitor which will
generate AC LOW signal, when the source falls
below 90070of itsnominalvalue.The AC LOW signal
iswired to pin 19 on J5A of the backplane. Pin 19 is
typicallyconnected toan interrupt matrix orcon-
troller on the Single Board Computer.
3-9. OUTPUT VOLTAGE ADJUSTMENTS.
Each output voltage level is individually adjustable.
Procedures for these adjustments are given in
Chapter 3 of the iSBC 635 Hardware Reference
Manual

CHAPTER 41
SERVICE INFORMATION
4-1.INTRODUFTION
This chapter provides service and repair assistance in-
structions, removal and replacement information,
and service diagram .
4-2.SERVICE hND REPAIR
ASSISTANCE
United States custOIrers can obtain service and repair
assistance from IJ;ltel by contacting the MCSD
Technical Support Center in Santa Clara, California
at one of the follow'ng numbers:
From Alaska or Hawaii call -
[phone]
From locationslwithin California calltoll free-
(800) 672-~507
From all other U.S. locations call tollfree -
(800) 538-~014
TWX: 910-338-0p26
TELEX: 34-6372
I
Always contact the MCSD TechnicalSupport Center
before returning a product to Intel for service or
repair.You will be given a "Repair Authorization
Number", shippin& instructions, and other impor-
tant information which will help Intel provide you
withfast, efficient service. If the product isbeing
returned because o~damage sustained during ship-
ment from Intel, or if the productis out of warranty,
a purchase order is ecessary in order for theMCSD
Technical Support Center to initiate the repair.
In preparing the prlduct forshipment to theMCSD
Technical Support Center, use the original factory
packaging material, if available. If the original
packaging is not <ljvailable, wrapthe product in a
cushioning materiallsuch as Air Cap TH-240 (or
equivalent) manufactured by the Sealed Air Corpora-
tion, Hawthorne, N.J., and enclose in a heavy-duty
corrugated shipping carton. Seal the carton securely,
mark it "FRAGILE" to ensure careful handling, and
shipit to the address specified by MCSD Technical
Support Center per onnel.
Customer outside of the United States
should contact their sales source (Intel Sales
Office or Authorized Intel Distributor) for
directionson obtaining service or repair
assistance.
The removaland replacement of most components in
theiSBC 655 isobvious. Only those procedures that
are critical or are not considered obvious will be dis-
cussed in this section.
The power supplycan be partially removed from the
chassisfor access to thebackplane. With partial
removal, the cablesare not disconnected and the
power supply is still operational.
Do not operate the iSBC 655 under load with
thepower supplypartially removed any
longer than 15 minutes for installation or
maintenance. The power supply can
overheat if under load and isnot cooled by
the internal fans.
For partial removal of the power supply proceed as
follows:
a. Set POWER switch to OFFand disconnect AC
power cord from its receptacle.
b.Remove top cover, front panelcover, and front
panel.
c.Be sure the main chassis islevel and remove the
four power supply retaining screws.
d.Pull power supplyout of chassis through front
panel access, until the two large posts on lower
rear corners of power supply contact the brackets
in lower cornersof front panel cutout.These
postswill support power supply so it can hang
below front panel.
For complete removal of the power supply, proceed
asfollows:
a. Perform steps (a) through (c) above.
b. Disconnect and tag power supply cables.
c. Lift power supply out through top of chassis.

4-5. (r- ARDCAGE/BACKPLANE
~EMOVAL
To re~ove thecardcage/backplane, proceed as
follow:
a. Dir:;connect AC power cord.
b. Rt move topcover and thefour screws that
se ure cardcagetobottom panel.
c. Mpve cardcage away from power supplytogain
ac ess to the two backplaneconnectors.
d. T g anddisconnect thetwoconnectors.
e. Li t card cage and backplane out of chassis.
f.Rt verse the steps for replacement.
4-6. INDICATOR LAMP REPLACEMENT
The P PWER switchhas an integral incandescent in-
dicato lamp. To replace the lamp,proceed as
follow:
a. Se POWER switchto OFF and remove front
parelcover.
b.Pull rectangular switch cover assembly straight
out from panel.
c.The indicatorlampis recessed in a sleeve in the
cover assembly. Remove lamp and replace with a
No.387lamp, size TI 3/4, 28V.
d.Replace switch cover and front panel.
The iSBC 655 Service Diagrams are given in figures
4-1 through 4-8. A signal mnemonic that ends with a
slash denotes the signal is active low (<i:;OAV). Con-
versely,a signal mnemonic without a slash denotes
the signal isactive high~2A V).
Table 4-1 liststhe replacement parts for the iSBC 655
chassis. The table is grouped according to chassis
modules. Abbreviations used in the parts listing are
identified in table 4-2. Parts for the power supply are
listed in the iSBC 635 Hardware Reference Manual.
FigLre &Description PartNo.Mfr.Code Oty
Inde No.
4-1 Main Frame Assembly
~
Tray, chassis3000626-01Intel 1
Cover,top 3000628-01 Intel 1
Panel,rear 3000654-01 Intel 1
~
Bracket,mounting switch 3000659-01 Intel 1
Clamp, cable 3000651-01 Intel 1
10 Card cage IBackplane assem bly 4000681-07 Intel 1
1D Plate,switchlocking 3000997-01Intel 1
1~ Harness,AC power 4000761-01 Intel 1
1~Power mounting bracket assembly 4000768-01 Intel 1
1p Subpanel assembly (see figure 4-3) 4002000-01Intel 1
117Frontpanel cable assembly 4001998-01 Intel 1
1~ Lamp,miniature 28v, .04 amp T 1.75 inch 387 GTE 1
3D Fan, 3.125 in.square by 1.64 in.wide SU 243ROT 2
3Fuse,5A 125V or 2.5A 250V OBD CML 1
2
17
Holder, fuse342048 LIT 1
2~ Filter, line 3A3EF1-E1-1 CC 1
2Switch,DPDT,illuminated (Sl) 572-8115-11ILL 1
2D Switch,DPDT,slide (S2) 46206LR SWI 1
2~ Connector,60 pin H312130TI1-4
1~ Power Supply (use either vendor) CP-174 POI 1
76863400 CDC
4-3 Subpanel Assembly 3000655-01 Intel1
Display overlay 4102001-01 Intel 1
Display subpanel 3001086-01 Intel 1
1 D
Switch, DPDT momentary (S3) 7208-J12EBXC&K 1
1Switch,SPDT momentary (S4) 7108-J12EBXC&K 1
4-4 Display Printed Circuit Board 1001994-01 Intel1
Nand gate IC,7438 (A 1,A3,A4) SN7438 TI3
Monostable multivibrator (A2) 9602 FAI 1
Diode,Light Emitting Red (DS1, DS2) MV5053 MON 2
Connector (J1) 87528-1 AMP 1
Resistor,33K ± 5%, .25W (R6) OBD CML 1
Resistor,240 ohm, ± 5%, .25W (R18,19) OBD CML 2
Resistor, 2.2K ± 5%, .25W (Rl-5,R7-17) OBD CML 16