IBM 6151 Maintenance And Service Manual page 96

4Cx
Advanced Floating-Point Board (Level 2)
Additional Tests: None
Removal Procedure: See Processor, Floating-Point, or System
Memory Removal in Section
4.
Repair Checkout: Run the System Checkout.
4Dx
RT PC Expansion Unit Cable
Additional Tests: None.
Removal Procedure: See the IBM RT PC 6192 Expansion Unit
Hardware Maintenance and Service manual.
Repair Checkout: Run the System Checkout.
4Fx
IBM 6156 Bezel/Cable Assembly
Additional Tests: None
Removal Procedure: See the IBM 6156 Portable Disk Drive
Hardware Maintenance and Service manual.
Repair Checkout: Run the Fixed·disk Drive and Media
Checkout.
3-0020-18 Service Manual