IBM 6151 Maintenance And Service Manual page 425

3. Remove the fixed-disk and diskette adapter from slot 6 and
place it on top of the system unit with the cables attached.
4. Remove the desired board.
5. Record the type and slot position.
- -
[AJ
Processor Board
[ijJ
Floating-Point Board
@]
Memory Option
[Q]
Memory Option
A,)ZB042
(6/88) Removal and Replacement 4-15