IBM PC 300, Maintenance Service Manual

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006 - ARE THE VOLTAGES CORRECT AND DOES THE FAN RUN? (YES, READ AHEAD. NO, GO TO STEP 009)
The power supply is working normally.
If you suspect the on/off switch cable assembly, see Step 003.
If the fan continues to run when all connectors are plugged back in, go to “Undetermined Problems” on page 80. If the
fan stops running when a drive connector is plugged back in, go to "Start" on page 55.
007 - DO YOU HAVE AN OHM READING WHEN THE SWITCH IS PRESSED AND AN OPEN READING WHEN THE
SWITCH IS RELEASED? (YES, READ AHEAD. NO, GO TO STEP 008)
Replace the on/off switch cable assembly.
008 -
Replace the system board.
End.
009 -
Replace the power supply.
End.