IBM PS/1, Hardware Maintenance Service

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MAP 0600 (continued)
ARE THE VOLTAGES CORRECT?
Yes No
035
Replace the power supply.
036
– Power off the system unit.
– Check all lines of the diskette drive signal cable for continuity.
DO ALL LINES HAVE CONTINUITY?
Yes No
037
Replace the diskette drive signal cable.
038
(From step 018)
IS YOUR SYSTEM BOARD A 486SX OR 486DX (30-PIN MEMORY
SIMMS)?
Yes No
039
Go to Step 042 on page 2-65.
040
You may have a failing SIMM.
Perform the following steps to check each of the SIMMs. You may have to
perform these steps several times.
– Power off the system unit.
– Replace one of the SIMMs with a known good SIMM.
– Power on the system unit.
(Step 040 continues)
2-64