8573 Common Devices
Open the Case
Remove Hard Drive
Set SCSI ID
External Storage Device Port
   External Storage Device Cable
      Cable Source
Power Supply Checkout
   Power Supply Fan (Remove/Install)
Remove power On Password
Symptom to FRU Index


Opening the Case
 


1. Strongly push below latch to release. 
2. Work right to left. Lift edge of rear cover outward to clear catch.
3. After releasing all the five latches, lift and remove the rear cover.
 
 

NOTE: There are two additional catches, one to each side of the carrying handle.When you lift up the rear cover, it pivots on them.



Hard Drive Removal

 
 

Detach power cable from system board.
Detach SCSI cable from system board.
Remove both screws from the HD Bracket.
Remove black screw from foot.
Pull drive cage up.
 
 
 
 
 
 



Set SCSI ID

          Switch Position
SCSI ID      1    2    3 
  ID6       Off  On   On
  ID5       On   Off  On
  ID4       Off  Off  On
  ID3       On   On   Off
  ID2       Off  On   Off
  ID1       On   Off  Off
  ID0       Off  Off  Off



External Storage Device Port
       The external storage device port is the equivalent of the B drive internal diskette port, as found in the PS/2 Model 70.  This permits attachment of externally powered devices like the IBM 4869 External Diskette Drive Model 001 and some other equipment manufacturers' backup devices.

External Storage Device Cable
           A new cable (#2716) (23F2716) is available for attaching appropriate external backup devices and diskette drives.  The cable features Hoshiden connector to attach to the P70 with an industry standard 37 pin D Shell connector that connects to the external powered devices.  The length of the cable is 35.5cm (14 inches). 
  Mondo 6 pin wide by 5 pin high rectangular connector. Still slogging through IBM Technoslavian, it's referred to as a "B drive" like on the Model 70 that does not take up the B letter as one would expect, but appears as "D".

External Storage Device Cable Source
  Thanks to the power of Capitalism, the good folks at  Prime Electronic Components, Inc. have them, it's 23F2716 for $9.95. They look like THIS



The system I am using sometimes refuses to start after power-on without any display or beep symptom. After several power on-off eventually it starts. Any idea???

From Peter
   Looks like a slightly buggy power supply -or- systemboard. The PSU is a little sensible against aging and overheating after many years, because it is a known "dust collector". The PSU fan sits awkwarly mounted over the PSU and only blows half (or less) through the PSU, which causes dust particles to stay in the PSU. I would recommend that you remove it from the machine and give it a good blow with a compressor and air-nozzle to get out the dust bunnies from it. Make sure the fan is in working order. 

On various occasions I saw failing mainboards. They refused to come on - and I don't know why. They simply died from one day to the next and could only be replaced. Back in the "good old days" with full IBM support and machines under warranty that was no big problem. Today things look different. If cleaning the power supply doesn't help - and if removing all adapters and testing with the bare sysboard doesn't change the misbehaviour: suspect the mainboard to be damaged and look for a replacement. 

Under rare circumstances a poorly seated card-riserboard caused trouble. Have the small two-slot riserboard removed, clean the contacts and spray a good amount of TV-tuner cleaner in the board connector. Let it dry for 10 minutes and use a piece of stiff card pushed into the connector with one edge and move it up / down the connector. Then spray the connector once again and let it dry for an hour. You might also repeat these steps on the two MCA slots on the
riserboard. Especially on the slot pointing towards the top of the unit, which collects dust when left with no card installed for a longer time.

Some older units also developed a sort of "creeping short" along the FDD cable where the FDD cable enters the "flip out" FDD bay. There was an ECA for the FDD cable from IBM for the earlier models, where FDD cables broke, shortened DC-voltages to GND or FDD signals and caused a dead systemboard. (Few only - IBM fixed it in an early stage).

Another potential problem has been reported with the memory modules. The system takes only 1 and 2MB modules anyway, but certain 2MB modules installed on the sysboard connectors with double sided 10 chips layout (20 chips total - 2 x 8 data + 2 x 2 parity - 16 bigger and 4 smaller chips) caused overload of the memory driver lines. This usually resulted in either a 200-something memory error -or- a machine failing to come up at all. 

I take from the 16MB you'd mentioned that the upper slot contains a memory card (the lower is too short anyway). So you should probably check the card connector as described further above and check if you cannot use memory modules with lower amount of chips. Usually the memory installed on cards causes a 200-series memory error in first place before dumping the machine to total darkness - but you never know. 

I have several P70 in my collection and all of these run with double-sided 2MB chips ... but I had a customer machine in '93 or so, which didn't. We used later 2MB/70ns 9-chip modules "hardware-recoded" (with soldering) to 2MB / 85ns and the system worked like a charm.
 

Power Systems Checkout
To check the power supply voltages, do the following:
Note:  If you can't power-on the computer, the hard disk drive motor-start jumper might be on .
Remove the motor-start jumper.
1. Power-off the computer.
2. Unplug the two power-supply connectors.
3. Power-on the computer and check for the voltages listed below.
If the voltages are not correct, check the power cord for continuity.
If the power cord is good, replace the power supply.

Vdc Min   Vdc Max   Ground () Pin   Positive (+) Pin
+4.8       +5.2      6, 7, or 8       3 ,4, or 5
+11.5     +12.6      6, 7, or 8            2
-11.0     -12.9      6, 7, or 8            1

Pin positions 6 and 7 are unpopulated.



System Unit Fan
   It is a Matsushita Panaflow DC Brushless fan, Model FBK-09A12L, DC 12v 0.1A

Remove/Install System Fan
   You will need a T-10 security Torx. Unfortunately, you need to get at the rear of the fan cage to get at the screws. If you don't want to disassemble the sytem, use a 1/4" drive ratchet and a hex bit adapter (assuming your security torx bit is a hex insert) to remove the two screws in the top two holes.
   Now pull the top outer edge out. Notice that the fan will pivot on the two white pivots at the base of the power supply. Carefully pull the power cable throgh the fan cage (you will have to turn the power connector to fit thru the opening).
   Personal opinion- I noticed that the factory routing of the fan's power wires routed them through the cutouts in the thermoplastic impeller housing. But notice that the right fan cage mount for the right screw extends past that cutout, thereby allowing you to tighten the fan housing against the extension with the wires between them. Not a good design. Fix- I pulled the wires out of the cutout and ran it down the side of the housing. There is enough room between the side of the fan cage and the fan housing for the wires to fit without being crushed.

System Unit Fan: 
  A non-functioning fan can cause heat to build up resulting in intermittent problems. If the fan is not running, replace the power supply.



Remove Power-on Password
To remove an active, unknown, power-on password do the following. 
   1. Power-off the computer and unplug the power cord. 
   2. Remove the system-unit cover. 
   3. Short the two pins of JP1 together. 

With the pins shorted, power-on the computer. This erases the power-on password. Remove the short after POST is finished. 



Symptom-to-FRU Index
 
Symptom/Error FRU/Action
Refdisk does not work.  (Try another Refdisk or bootable diskette before replacing FRUs..) 1. Diskette Drive
2. System Board
3. Diskette Drive Cable 
4. Reference Diskette
Refdisk does not work.  (Try another Refdisk or bootable diskette before replacing FRUs..) 1. Diskette Drive 
2. System Board
3. Diskette Drive Cable 
4. Reference Diskette
One or more keys do not work 1. Keyboard 
2. Keyboard Cable 
3. System Board
Changing colors 1. External Display 
2. Plasma Display Card
Power LED not lit - fan does not run 1. Power Supply 
2. System Board 
3. Any device or adapter
No beep, computer is otherwise functional. 1. Speaker Assembly 
2. System Board
No beep and nonfunctional computer. 1. System Board 
2. PowerSupply
Continuous beep 1. Power Supply 
2. System Board
Repeating short beeps 1. Power Supply 
2. System Board 
3. Keyboard (stuck key)
One long and one short beep 1. Display Option Adapter (if installed) 
2. System Board 
3. Power Supply
One long and two short beeps 1. Plasma Display Card 
2. System Board 
3. Power Supply 
4. Display Option Adapter 
One short beep and a blank or unreadable display with no external display 1. Plasma Display Assembly 
2. Plasma Display Cables 
3. Plasma Display Card 
4. System Board
One short beep and diskette prompt or a program loads from the fixeddisk drive 1. Diskette Drive 
2. System Board 
3. Power Supply
LED for HD stays on. 1. Fixed Disk Drive  
2. System Board   
3. Power Supply
LED for HD not lit, computer fully functional. 1. LED Assembly 
2. System Board
SCSI ID of internal HD can't be set correctly 1. Set Configuration 
2. Internal SCSI Fixed Disk Drive 
3. SCSI ID Switch
000110XX 
 
1. System Board Memory Module 
2. System Board
000111XX 
 
1. Memory Expansion Kit 
2. Memory Expansion Adapter
000112XX 
000113XX
1. Any Adapter 
2. System Board
000161XX  1. Battery
000162XX 
(Verify correct enable/disable settings )
1. Any Device
000163XX
000164XX
000165XX
1. Set Configuration 
2. System Board
000166XX  1. Any Adapter
000194XX  1. System Board 
2. Memory Module
0001XXXX (not listed above) 1. System Board
000201XX  1. System Memory/Expansion Memory 
2. System Board
20X (slot 0) 1. System Board Memory Module 
2. SystemBoard
20X (slot 1 - 4)  1. Adapter Memory 
2. Memory Adapter
000211XX 
000215XX 
000216XX 
000221XX 
1. System Board Memory Module 
2. System Board
000225XX  1. System Board Memory Module 
2. System Board
000301XX 
000302XX 
1. Keyboard 
2. Keyboard Cable 
3. System Board 
000303XX  1. System Board 
2. Keyboard 
3. KeyboardCable 
000304XX  1. System Board 
2. Keyboard
000305XX  1. Keyboard Cable
000401XX  1. System Board
000602XX 1. Defective Diskette
0006XXXX  1. Diskette Drive 
2. System Board 
3. Power Supply 
4. Diskette-Drive Cable
0007XXXX  1. Processor Board 
2. System Board
001102XX 
001106XX 
1. System Board 
2. Any Serial Device
001107XX  1. Communications Cable 
2. System Board
001108XX 
001109XX 
1. System Board 
2. Serial Device
0011XXXX (not listed above)  1. System Board
001202XX 
001206XX 
1. Dual Async Adapter/A
001207XX  1. Communications Cable 
2. Dual Async Adapter/A
001208XX 
001209XX 
1. Serial Device 
0012XXXX (not listed above)  1. Dual Async Adapter/A 
2. System Board
0014XXXX 1. Printer 
2. System Board
004611XX 
004630XX 
1. Multiport/2 Interface Board 
2. Multiport/2 Adapter
004612XX 
004613XX 
004640XX 
004641XX 
1. Memory Module 
2. Multiport/2 Adapter
004650XX  1. Multiport Interface Cable
0046XXXX  1. Multiport/2 Adapter 
2. Interface Board 
3. Memory Module
008601XX 
008602XX 
1. Pointing Device
008603XX  1. System Board
008604XX 1. System Board 
2. Pointing Device
0096XXXX  1. SCSI Adapter (with cache)
2. Any SCSI Device 
3. System Board
010007XX  1. Communications Cable 
2. Multiprotocol Adapter/A
0100XXXX 
(not listed above)
1. Multiprotocol Adapter/A 
2. System Board
010102XX 
010106XX 
010108XX 
1. Modem Adapter/A
0010109XX  1. Serial Device 
0101XXXX (not listed above) 1. Modem Adapter/A 
2.System Board
0112XXXX 
( SLOT 1 is the built-in SCSI adapter)
1. SCSI Adapter (without cache) 
2. SCSI Device
000107XX 1. 5.25" External Diskette Drive 
2. 5.25" External Diskette Drive Adapter/A
012102XX 
012106XX 
012108XX 
1. 300/1200/2400 Modem Adapter/A
012109XX  1. Serial Device
0121XXXX (not listed above)  1. 300/1200/2400 Modem Adapter/A 
2. System Board
012901XX 
012902XX 
012903XX 
1. Processor Card 
2. SystemBoard
014710XX 1. Plasma Display Card 
2. Display Option Adapter
014711XX 1. Plasma Display Card 
2. Display Option Adapter
0147XXXX 1. Plasma Display Card 
2. Display Option Adapter 
3. System Board 
4. Processor Card
01490XXX 
01491XXX 
01492XXX
1. Plasma Display Card 
2. System Board 
3. Plasma Display Assembly
014932XX  1. External Display 
2. Plasma Display Card
014952XX  1. Plasma Display Assembly 
2. Plasma Display Card 
3. System Board
016500XX  1. 6157 Tape Attachment Adapter
016520XX 1. 6157 Streaming Tape Drive
016540XX 1. 6157 Streaming Tape Drive 
2. 6157 Tape Attachment Adapter
0166XXXX 
0167XXXX 
1. Token-Ring Network Adapter/A 
2. SystemBoard
0208XXXX 
(Check for duplicate SCSI ID settings.)
1 .Any SCSI Device
0210XXXX  1. SCSI Fixed Disk Drive 
2. SCSIAdapter 
3. SCSI Cable 
4. SCSI ID Switch (internal SCSI HD only)
0215XXXX  1. SCSI CD-ROM Drive 
2. SCSI Adapter

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d>1. Keyboard Cable 000401XX  1. System Board 000602XX 1. Defective Diskette 0006XXXX  1. Diskette Drive 
2. System Board 
3. Power Supply 
4. Diskette-Drive Cable 0007XXXX  1. Processor Board 
2. System Board 001102XX 
001106XX  1. System Board 
2. Any Serial Device 001107XX  1. Communications Cable 
2. System Board 001108XX 
001109XX  1. System Board 
2. Serial Device 0011XXXX (not listed above)  1. System Board 001202XX 
001206XX  1. Dual Async Adapter/A 001207XX  1. Communications Cable 
2. Dual Async Adapter/A 001208XX 
001209XX  1. Serial Device  0012XXXX (not listed above)  1. Dual Async Adapter/A 
2. System Board 0014XXXX 1. Printer 
2. System Board 004611XX 
004630XX  1. Multiport/2 Interface Board 
2. Multiport/2 Adapter 004612XX 
004613XX 
004640XX 
004641XX  1. Memory Module 
2. Multiport/2 Adapter 004650XX  1. Multiport Interface Cable 0046XXXX  1. Multiport/2 Adapter 
2. Interface Board 
3. Memory Module 008601XX 
008602XX  1. Pointing Device 008603XX  1. System Board 008604XX 1. System Board 
2. Pointing Device 0096XXXX  1. SCSI Adapter (with cache)
2. Any SCSI Device 
3. System Board 010007XX  1. Communications Cable 
2. Multiprotocol Adapter/A 0100XXXX 
(not listed above) 1. Multiprotocol Adapter/A 
2. System Board 010102XX 
010106XX 
010108XX  1. Modem Adapter/A 0010109XX  1. Serial Device  0101XXXX (not listed above) 1. Modem Adapter/A 
2.System Board 0112XXXX 
( SLOT 1 is the built-in SCSI adapter) 1. SCSI Adapter (without cache) 
2. SCSI Device 000107XX 1. 5.25" External Diskette Drive 
2. 5.25" External Diskette Drive Adapter/A 012102XX 
012106XX 
012108XX  1. 300/1200/2400 Modem Adapter/A 012109XX  1. Serial Device 0121XXXX (not listed above)  1. 300/1200/2400 Modem Adapter/A 
2. System Board 012901XX 
012902XX 
012903XX  1. Processor Card 
2. SystemBoard 014710XX 1. Plasma Display Card 
2. Display Option Adapter 014711XX 1. Plasma Display Card 
2. Display Option Adapter 0147XXXX 1. Plasma Display Card 
2. Display Option Adapter 
3. System Board 
4. Processor Card 01490XXX 
01491XXX 
01492XXX 1. Plasma Display Card 
2. System Board 
3. Plasma Display Assembly 014932XX  1. External Display 
2. Plasma Display Card 014952XX  1. Plasma Display Assembly 
2. Plasma Display Card 
3. System Board 016500XX  1. 6157 Tape Attachment Adapter 016520XX 1. 6157 Streaming Tape Drive 016540XX 1. 6157 Streaming Tape Drive 
2. 6157 Tape Attachment Adapter 0166XXXX 
0167XXXX  1. Token-Ring Network Adapter/A 
2. SystemBoard 0208XXXX 
(Check for duplicate SCSI ID settings.) 1 .Any SCSI Device 0210XXXX  1. SCSI Fixed Disk Drive 
2. SCSIAdapter 
3. SCSI Cable 
4. SCSI ID Switch (internal SCSI HD only) 0215XXXX  1. SCSI CD-ROM Drive 
2. SCSI Adapter

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