IBM PCjr

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Set the system unit's Power switch to Off.
Remove the power board and set it aside. Make a
note that this is power board #1.
Attach a new power board. Make a note that this is
power board #2.
Set the system unit's Power switch to On.
Wait one minute.
DID YOU HEAR ONE BEEP?
YES The problem has been corrected. Reconnect
aU removed items, then repeat advanced
POST and the advanced tests to ensure that
the IBM PC/r is operating correctly.
NO The system board is bad. Replace it.
Repeat advanced POST and the advanced
tests to ensme that the IBM PC/r is operating
correctly.
Power 3-020-11