IBM 6151 Maintenance And Service Manual page 289

Step 9
The following is a list of devices and the most likely failing FRUs
for each device:
Diskette
Fixed disk
Printer
Plotter
Terminal
Modem
Coprocessor
Display
Keyboard
Mouse
Tape
The adapter for the fixed-disk and diskette drives,
the diskette drive, the diskette
The adapter for the fixed-disk and diskette drives,
the fixed-disk drive
The printer adapter, the printer, the printer cable
The plotter adapter, the plotter, the plotter cable
The terminal adapter, the terminal, the terminal
cable
The adapter the modem is attached to, the modem,
the modem cable
The IBM AT" Coprocessor Option, the IBM AT
Math Co-processor module, the IBM AT 512KB
Memory Expansion Option
The display adapter, the display, the display cable
The keyboard, the system board
The mouse, the system board
The tape drive adapter, the tape drive. the tape
cartridge.
In addition to the above FRUs, the following common FRUs can
also cause a problem:
• System board
• Processor board
• Memory expansion option
• Floating-point board
• Power supply.
Step 9 continues on the next page.
AT is a registered trademark of International Business Machines
Corporation.
(6/88) Problem Isolation Charts 3-0080-9