IBM PS2 Model P70 386 Hardware Maintenance Service: Difference between revisions

Latest revision as of 21:18, 30 September 2026

The IBM PS/2 Model P70 386 HMS (Hardware Maintenance Service) is IBM's fault-isolation and parts pamphlet for the Personal System/2 Model P70 386 (type 8573). The front page gives part number 15F2198, form number S15F-2198-00 and the date 21 March 1990; the edition notice says First Edition (March 1990). The PDF has 33 pages. It is a text conversion of IBM's softcopy edition, numbered by topic ("4.0 - 1"), with its three illustrations replaced by placeholders.

IBM describes it on the front page as containing "procedures for isolating problems to a FRU, a Symptom-to-FRU Index, and a parts listing", to be used with the general IBM Personal System/2 Hardware Maintenance Reference (part number 15F2190) and Hardware Maintenance Service (part number 15F2200) manuals. The removals, locations and specifications for the P70 are in the companion P70 386 HMR (64F3994).

Topic	Subject
1.0	General checkout (numbered step procedure)
2.0	Installed devices list: automatic configuration, device type, SCSI and non-SCSI devices
3.0	Undetermined problem
4.0	Power supply voltages
5.0	Enable and disable settings
6.0	External display self-test
7.0	Display Adapter 8514/A
8.0	Keyboard
9.0	Printer
10.0	Memory
11.0	Symptom-to-FRU Index: beep and no-beep symptoms, then POST error codes in eight-digit form
12.0	How to use the parts catalogue, with an example
13.0	Parts, including supplemental parts for concurrent replacement

Figures a repairer can use

**P70 386 supply test limits (HMS topic 4.0)**
Rail	Minimum	Maximum	Ground pin	Positive pin
+5 V	+4.8 V	+5.2 V	6, 7 or 8	3, 4 or 5
+12 V	+11.5 V	+12.6 V	6, 7 or 8	2
-12 V	-11.5 V	-12.6 V	6, 7 or 8	1

IBM's instruction is to replace the supply if the voltages are wrong or the fan is not running (4.0). The undetermined-problem procedure (3.0) removes non-IBM devices, external devices, the math coprocessor and adapters one at a time, then checks the supply, then replaces the system board.

Memory errors (10.0): 00011000 is a system-board parity check, 00011100 a memory-expansion adapter parity check, and 00021500 or 00021600 a failing system-board memory module kit.

Main FRU numbers (13.0):

Power supply 38F4734; plasma-display assembly 38F4737; plasma-display adapter 38F4686; battery 72X8498.
System board, 16 MHz: 38F5969 (serial numbers xxxx49999 or earlier) or 56F9084 (xxxx50001 or later). 20 MHz: 65X1564 or 56F9085, split the same way.
1.44 MB diskette drive 38F5936; 30, 60 and 120 MB ESDI fixed disks 6128287, 90X8627 and 90X9286.

Early machines need several parts changed together. For serial numbers 230000001 to 230004000 and 231000001 to 231001000, IBM says to check the plasma-display assembly: if its FRU number is not 38F4737 and the supply-to-display power cable is not grey, replace the plasma-display assembly, plasma-display adapter, power supply and plasma-display power cable (38F5939) at the same time (13.0, supplemental parts).

What this manual does not contain

The general safety information and safety inspection guide are in the separate Hardware Maintenance Service General Information pamphlet, which is not part of this PDF. There are no removal procedures or location drawings (those are in the HMR), no schematic and no component values: the supply, the plasma display and its adapter are each a single FRU.

Download: IBM PS2 Model P70 386 HMS.pdf

Related pages

IBM PS2 Model P70 386 Hardware Maintenance Reference, IBM PS2 Model P70 Technical Reference (April 1989), IBM PS2 Model P70 HITR Supplement
IBM Mobile Systems Hardware Maintenance Manual Volume 1, which also covers the P70 and P75 (8573)

@@ Line 1: / Line 1: @@
-The '''IBM PS/2 Model P70 386 Hardware Maintenance Service''' is IBM's 33-page service pamphlet for the PS/2 Model P70 386 (8573). '''Part number 15F2198, form number S15F-2198-00, First Edition (March 1990)'''. It is the fault-isolation half of the pair; the [[IBM PS2 Model P70 386 Hardware Maintenance Reference|Hardware Maintenance Reference]] is the removals-and-locations half.
+The '''IBM PS/2 Model P70 386 HMS''' (Hardware Maintenance Service) is IBM's fault-isolation and parts pamphlet for the Personal System/2 Model P70 386 (type 8573). The front page gives part number 15F2198, form number S15F-2198-00 and the date 21 March 1990; the edition notice says First Edition (March 1990). The PDF has 33 pages. It is a text conversion of IBM's softcopy edition, numbered by topic ("4.0 - 1"), with its three illustrations replaced by placeholders.
-== What it contains ==
+IBM describes it on the front page as containing "procedures for isolating problems to a FRU, a Symptom-to-FRU Index, and a parts listing", to be used with the general ''IBM Personal System/2 Hardware Maintenance Reference'' (part number 15F2190) and ''Hardware Maintenance Service'' (part number 15F2200) manuals. The removals, locations and specifications for the P70 are in the companion [[IBM PS2 Model P70 386 Hardware Maintenance Reference|P70 386 HMR]] (64F3994).
-* '''1.0 General Checkout''' and '''2.0 Installed Devices List''' &mdash; automatic configuration, device types, SCSI and non-SCSI devices.
+== Contents ==
-* '''3.0 Undetermined Problem''' &mdash; IBM's isolation-by-removal sequence.
-* '''4.0 Power Supply Voltages''' &mdash; the connector-pin measurements for this chassis.
-* '''5.0 Enable and Disable Settings''', '''6.0 External Display Self-Test''', '''7.0 Display Adapter 8514/A''', '''8.0 Keyboard''', '''9.0 Printer''', '''10.0 Memory'''.
-* '''11.0 Symptom-to-FRU Index''' &mdash; the numeric POST codes and beep symptoms mapped to FRUs.
-* '''12.0 How To Use This Parts Catalog''' (with a worked example) and '''13.0 Parts'''.
-== What it does not contain ==
+{| class="wikitable" style="width:80%;"
+! Topic !! Subject
+|-
+| 1.0 || General checkout (numbered step procedure)
+|-
+| 2.0 || Installed devices list: automatic configuration, device type, SCSI and non-SCSI devices
+|-
+| 3.0 || Undetermined problem
+|-
+| 4.0 || Power supply voltages
+|-
+| 5.0 || Enable and disable settings
+|-
+| 6.0 || External display self-test
+|-
+| 7.0 || Display Adapter 8514/A
+|-
+| 8.0 || Keyboard
+|-
+| 9.0 || Printer
+|-
+| 10.0 || Memory
+|-
+| 11.0 || Symptom-to-FRU Index: beep and no-beep symptoms, then POST error codes in eight-digit form
+|-
+| 12.0 || How to use the parts catalogue, with an example
+|-
+| 13.0 || Parts, including supplemental parts for concurrent replacement
+|}
-'''Module level only.''' IBM serviced these machines by field-replaceable-unit exchange, and this pamphlet reflects that: it names FRU part numbers, not component values. There is no capacitor list, no resistor list, no semiconductor list and no schematic anywhere in it. The power supply, the planar and each drive are single line items in the parts catalogue. This is why no IBM machine checked in this wiki's verification drive has a published component-level capacitor list &mdash; it is not that the manuals were lost, it is that IBM never wrote one.
+== Figures a repairer can use ==
-It is also '''not a standalone book'''. IBM issued it as a pamphlet to be filed in a binder alongside the general-purpose ''IBM Personal System/2 Hardware Maintenance Reference'' (part number 15F2190, form number S15F-2190-00) and ''Hardware Maintenance Service'' (part number 15F2200, form number S15F-2200-00), which carry the safety information, the general checkout procedure and the option and adapter sections. Those two general volumes are not hosted here.
+<templatestyles src="Template:StyledTable/styles.css" />
+{| class="wikitable styled-table" style="width:70%; text-align:center;"
+|+'''P70 386 supply test limits (HMS topic 4.0)'''
+! Rail !! Minimum !! Maximum !! Ground pin !! Positive pin
+|-
+| +5 V || +4.8 V || +5.2 V || 6, 7 or 8 || 3, 4 or 5
+|-
+| +12 V || +11.5 V || +12.6 V || 6, 7 or 8 || 2
+|-
+| -12 V || -11.5 V || -12.6 V || 6, 7 or 8 || 1
+|}
+IBM's instruction is to replace the supply if the voltages are wrong or the fan is not running (4.0). The undetermined-problem procedure (3.0) removes non-IBM devices, external devices, the math coprocessor and adapters one at a time, then checks the supply, then replaces the system board.
+Memory errors (10.0): 00011000 is a system-board parity check, 00011100 a memory-expansion adapter parity check, and 00021500 or 00021600 a failing system-board memory module kit.
+Main FRU numbers (13.0):
+* Power supply 38F4734; plasma-display assembly 38F4737; plasma-display adapter 38F4686; battery 72X8498.
+* System board, 16 MHz: 38F5969 (serial numbers xxxx49999 or earlier) or 56F9084 (xxxx50001 or later). 20 MHz: 65X1564 or 56F9085, split the same way.
+* 1.44 MB diskette drive 38F5936; 30, 60 and 120 MB ESDI fixed disks 6128287, 90X8627 and 90X9286.
+Early machines need several parts changed together. For serial numbers 230000001 to 230004000 and 231000001 to 231001000, IBM says to check the plasma-display assembly: if its FRU number is not 38F4737 and the supply-to-display power cable is not grey, replace the plasma-display assembly, plasma-display adapter, power supply and plasma-display power cable (38F5939) at the same time (13.0, supplemental parts).
+== What this manual does not contain ==
+The general safety information and safety inspection guide are in the separate ''Hardware Maintenance Service General Information'' pamphlet, which is not part of this PDF. There are no removal procedures or location drawings (those are in the HMR), no schematic and no component values: the supply, the plasma display and its adapter are each a single FRU.
 <pdf> File:IBM PS2 Model P70 386 HMS.pdf </pdf>
-Download it here: [[:File:IBM PS2 Model P70 386 HMS.pdf|IBM PS2 Model P70 386 HMS.pdf]]
+Download: [[:File:IBM PS2 Model P70 386 HMS.pdf|IBM PS2 Model P70 386 HMS.pdf]]
 == Related pages ==
-* [[IBM PS2 Model P70 386 Hardware Maintenance Reference]] &middot; [[IBM PS2 Model P70 Technical Reference (April 1989)]] &middot; [[IBM PS2 Model P70 HITR Supplement]]
+* [[IBM PS2 Model P70 386 Hardware Maintenance Reference]], [[IBM PS2 Model P70 Technical Reference (April 1989)]], [[IBM PS2 Model P70 HITR Supplement]]
+* [[IBM Mobile Systems Hardware Maintenance Manual Volume 1]], which also covers the P70 and P75 (8573)
 [[Category:IBM Service Manuals]]
 [[Category:Service Manuals]]

Josh (talk | contribs)

Latest revision as of 21:18, 30 September 2026

Contents

Figures a repairer can use

What this manual does not contain

Related pages