IBM 6151 Maintenance And Service Manual page 90

3Ax
RT PC S/370 Host Interface Adapter
Additional Tests: None
Removal Procedure: See "Removal Procedure" on page 9-097-2.
Repair Checkout: Run the System Checkout.
3Bx
8-Port Asynchronous RS-422A Adapter
Additional Tests: Run the RT PC 8-Port Asynchronous RS422
Adapter Checkout.
Removal Procedure: If the adapter is in the system unit, see
Adapter Removal in Section 4, otherwise
see the service information for the unit
where the adapter is installed.
Repair Checkout: Run the RT PC 8-Port Asynchronous RS422
Adapter Checkout.
3-0020-12 Service Manual