IBM PCjr Hardware Maintenance And Service page 176

1. Set the system unit's Power switch to Off.
2. Remove the 64KB memory and display expansion
and set it aside.
3. Perform advanced POST.
The IBM Personal Computer Basic
Version 01.20 Copyright IBM Corp.1981
XXXXX Bytes free
OK
iHEO 2liL!i:p 3[EZaa 40333 sk-IOB
DID ADVANCED POST SUCCESSFULLY
COMPLETE?
The 64KB memory and display expansion is
bad. Replace it.
Repeat advanced POST and the advanced
tests to ensure that the IBM PCyr is operating
correctly.
Reattach the 64KB memory and display
expansion.
Continue to the next page.
Diskette Drive 3-600-19