IBM 6151 Maintenance And Service Manual page 103

63x
Operator Panel Board
Additional Tests: None
Removal Procedure: See Operator Panel Board Removal in
Section 4.
Repair Checkout: Run the System Checkout. The two-digit
display displays 88 immediately after the
power switch is set to On for a lamp test.
In normal operation, the two-digit display is
blank when the POST programs complete.
64x
IBM High Capacity Diskette Drive
Additional Tests: Run the Diskette Drive Checkout.
Removal Procedure: See Diskette Drive Removal in Section 4.
Repair Checkout: Run the Diskette Drive Checkout.
65x
IBM 6156 Model 001
Additional Tests: None
Removal Procedure: See Attached Device Removal in
Section 4.
Repair Checkout: Run the System Checkout.
(6/88) Problem Isolation Charts 3-0020-25