HP Portable 386 Compaq Portable 386 Personal Computer Maintenance and Service - Page 52

Replace 512 Kbyte Memory Modules J1 through J8 with PN 107687-001.

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Defective Memory Isolation Memory error codes are shown on the display in an 8 digit format (XX000Y ZZ). The XX and Y alphanumeric codes are the key identification points for defective memory isolation. Due to the design of the COMPAQ PORTABLE 386 Personal Computer, the remaining codes in the format are not required for determining memory locations. The 8 digit code is defined as follows: XX 000 Y ZZ Failed data bit. Values are: || | | 00, 01, 02, 04, 08, 10, 20, 40, 80, ??. || | | || | | Failed byte. Values are: || | 0, 1, 2, 3. || | Always zero. || Reserved. Ignore. | Megabyte where error occurred. Ignore Memory Locations After identifying X and Y use Figures 6-1, 6-2, 6-3, and 6-4 to locate the defective memory module or board. For information on removing and replacing the system board or the memory options, see Chapter 8, "Removal and Replacement Procedures." Memory Replacement Replace 512 Kbyte Memory Modules J1 through J8 with PN 107687-001. Replace the 4 Megabyte Memory Expansion Board with PN 107688-001. Replace the 4 Megabyte Memory Extension Board with PN 107685-001.

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Defective Memory Isolation
Memory error codes are shown on the display in an 8 digit format (XX000Y ZZ).
The XX and Y alphanumeric codes are the key identification points for
defective memory isolation. Due to the design of the COMPAQ PORTABLE 386
Personal Computer, the remaining codes in the format are not required for
determining memory locations.
The 8 digit code is defined as follows:
XX 000 Y ZZ
|| | | |------- Failed data bit. Values are:
|| | |
00, 01, 02, 04, 08, 10, 20, 40, 80, ??. Ignore
|| | |
|| | |
|| |
---------- Failed byte. Values are:
|| |
0, 1, 2, 3.
|| |
||
------------- Always zero.
||
| ---------------- Reserved. Ignore.
|
----------------- Megabyte where error occurred.
Memory Locations
After identifying X and Y use Figures 6-1, 6-2, 6-3, and 6-4 to locate the
defective memory module or board. For information on removing and replacing
the system board or the memory options, see Chapter 8, "Removal and
Replacement Procedures."
Memory Replacement
Replace 512 Kbyte Memory Modules J1 through J8 with PN 107687-001.
Replace the 4 Megabyte Memory Expansion Board with PN 107688-001.
Replace the 4 Megabyte Memory Extension Board with PN 107685-001.