IBM 6151 Maintenance And Service Manual page 123

B4x
RT PC ASCII Terminal Cable - RS-232C (10 Pin)
Additional Tests: None
Removal Procedure: See Adapter Removal in Section 4.
Repair Checkout: Run a normal customer program.
B5x
RT PC ASCII Terminal Cable - RS-422A
Additional Tests: None
Removal Procedure: See Adapter Removal in Section 4.
Repair Checkout: Run a normal customer program.
B6x
RT PC Serial Printer Cable (10 Pin)
Additional Tests: None
Removal Procedure: See Adapter Removal in Section 4.
Repair Checkout: Run a normal customer program.
(6/88) Problem Isolation Charts 3-0020-45