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IBM PS/1 - Page 91

IBM PS/1
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092 (continued)
The error message displayed indicates the failing SIMM by position. Refer
to “486SX 20MHz/486SX 25MHz Level 1 (30-Pin Memory SIMM) System
Board Layout” on page 5-9.
Make a note of the error.
Power off the system unit.
Move the four SIMMs to bank 1.
Power on the system unit.
If you get a POST error, press Esc.
Run the memory test.
DID YOU RECEIVE AN ERROR?
Yes No
093
Replace the failing system board.
094
Replace the failing SIMM.
095
(From step 083)
Power off the system unit.
Replace each memory SIMM one at a time with a known good memory
SIMM of equivalent value.
Power on the system unit.
If the symptom goes away, the last memory SIMM replaced is defective. If
all memory SIMMs have been replaced and the problem remains, replace
the system board.
Note: Since the 486SX, 486DX, and 486DX2 (72-pin memory SIMM)
system boards have no soldered memory, you must have at least
one memory SIMM installed for the system to operate.
Diagnostic Information 2-53

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