IBM PCjr Hardware Maintenance And Service page 256

Diskette Drive Removal 610
Waming: Be careful when the top cover is off the
system unit. The components on the power board
can become hot with the system unit On.
1. Set the system unit's Power switch to Off.
2. Remove the system unit top cover (100).
3. Remove the internal modem, if installed (830).
4. Remove the 64KB Memory and Display Expansion,
if installed (200).
5. Remove the diskette-drive adapter (600).
64KB Memory and
Display Expansion
Power Adapter
System Board
Diskette Drive
Diskette-Drive
Adapter
Internal Modem
Diskette Drive 4-600-3