IBM PCjr Hardware Maintenance And Service page 311

Diskette-Drive Fan Replacement 640
Warning: Be carefulwhen the top cover is off the
system unit. The components on the power board
can become hot with the system unit On.
Align the diskette-drive fan so that the pinsmolded into
the mounting bracket mate with the holes in the fan.
1. Use two screws andfasten the fan assembly to the
diskette-drive mounting bracket.
2. Replace the diskette drive (615).
Diskette-Drive
Diskette-Drive
Mounting Bracket
Diskette Drive 4-600-13