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Service Hints & Tips

Document ID: MCGN-3N9MVH

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PC Server 325/330 - Trap/hang with 128MB DIMM

Applicable to: AP-S, Canada, LA, United States

Source: RETAIN tip H161527

Symptom
PC Server 325/330 intermittent trap or hang. The failure may appear as:
- System hang
- Trap
- Blue screen
- Abend
- Memory error

Problem Isolation Aids
- The system is a PC Server 325 type 8639 model EJ0/ES0/ESV/RS0/PT0/PTW/PB0/RB0 or PC Server 330 type 8640 model ES0/ES2/ESS/EM2/PT0/PB0/PM0

- The system has one or more 128MB DIMM FRU p/n76H0656, Option p/n94G6475, Assembly p/n63H0937.

Note: The DIMM may or may not have a FRU# or Option# listed on the IBM sticker but will have the Assembly# listed directly below the bar code on the IBM sticker(see the IBM Label layout in diagram A)

- All memory in the system is IBM Qualified and Supported.

Fix
1- Eliminate the possibility of a DIMM placement problem by ensuring that the installed memory DIMMs in the system are located in order of capacity. Start with the greater capacity DIMM located in the connector marked J2 (closest to the outside edge of the processor board) and then continue with J3, J4, and J5 in order of decreasing DIMM capacities. Refer to the "User's Handbook" - Working with Memory-Module Kits for further details.

2- Locate the Barcode on the IBM label attached to the 128mb DIMM.

3- Examine the numbers listed below the Barcode to confirm the Assembly p/n63H0937 as well as the Header code located immediately to the right of the Assembly #.

4- If the header code contains any of the following codes, the memory is suspected to be faulty:

J12S3 J1369 J1414 J1415

5- Replace suspected faulty 128MB DIMM(s) that have any of the Header codes listed above with a new DIMM, FRU p/n76H0656.

NOT all Systems with the 128MB DIMM(s) installed will experience failures; do NOT replace the 128MB DIMM(s) unless failures are observed.

Note: 128MB DIMM's with any other header codes are not suspect.

Diagram A: SAMPLE 128 MB MEMORY DIMM with IBM Label:

___________________________________________________________
| _________ ________ ______________________ |
| | S E C | | S E C | |xxxxxxxxxxxx | |
| |_________| |________| |xxxxxxxxxxxx xxxxx | |
| ___ ___ | xx xx |<---
| | || ||IBM xxxxx | | '
O | || ||_____________________| O '
| _________ ________ | || | ________ ________ | '
| | S E C | | S E C || || || S E C | | S E C | | '
| |_________| |________||___||___||________| |________| | '
| | '
|__|||||||||O|||||||||O|||||||||||||||||||||||||||||||||||__| '
'
'
'
_____________________ Assembly # 63H0937 '
| _____________ Header code Jxxxx '
__|___ __|__ (total of 22 char.) '
______________________________________________ '
| |||||||||||||||||||||||| <--Barcode | '
| xxx63H0937xJ1369xxxxxx Fru: 76H0656 | '
| MB NS |<--------'
| ___ ___ | IBM Label
| | | | |\/| Opt: 94G6475 |
| | |--| | | |
| _|_ |__| | | |
|______________________________________________|

Although the FRU number has not changed, Current Option, FRU, and Manufacturing stock do not contain affected DIMMs.

SAS KEYWORDS:
PSY2, PSY2ERR, PSY2MEM, PSY2PART, 76H0656, 63H0937, MEMORY, 94G6475, D/T8639, D/T8640, 8639-EJ0, 8639-ES0, 8639-ESV, 8639-RS0, 8639-PT0, 8639PTW, 8639-PB0, 8639-RB0, 8640-ES0, 8640-ES2, 8640-ESS, 8640-EM2, 8640-PT0, 8640-PB0, 8640-PM0, HANG, TRAP, BLUE SCREEN, ABEND, MEMORY ERROR, 128MB DIMM, DIMM, ERROR, HEADER CODE

	Search Keywords	PSY2, PSY2ERR, PSY2MEM, PSY2PART, 76H0656, 63H0937, MEMORY, 94G6475, D/T8639, D/T8640, 8639-EJ0, 8639-ES0, 8639-ESV, 8639-RS0, 8639-PT0, 8639PTW, 8639-PB0, 8639-RB0, 8640-ES0, 8640-ES2, 8640-ESS, 8640-EM2, 8640-PT0, 8640-PB0, 8640-PM0, HANG, TRAP
	Hint Category	Lock-up/Hang, Memory, Retain
	Date Created	27-10-97
	Last Updated	28-10-98
	Revision Date	28-10-99
	Brand	IBM PC Server
	Product Family	PC Server 325, PC Server 330
	Machine Type	8639, 8640
	Model	EJ0; ES0; ESV; RS0; PT0; PTW; PB0; RB0 ES0; ES2; ESS; EM2; PT0; PB0; PM0; 11Y; 1RY
	TypeModel
	Retain Tip (if applicable)	H161527
	Reverse Doclinks and Admin Purposes