IBM 6151 Maintenance And Service Manual page 438

Diskette Drive Replacement
Follow the Handling a Diskette Drive procedures. If needed, see
Section 7.
1. Be sure the terminator resistor is installed. If needed, refer to
Section 7.
2. Align the drive and push it into the system unit until the latch
wire clicks.
Drive Latch Wire
AJZBF024
4-28 Service Manual