IBM 6400 series Maintenance Manual page 89

If the message appears, replace the shuttle frame assembly.
083 INTAKE FAN FAULT
1. Sensors cannot detect current in the card cage fan circuit.
Cycle power. If the message appears, press Stop.
2. Power off the printer. Remove the paper guide assembly or pedestal top cover.
Disconnect connector P106 from the CMX controller board. Test connector
P106/CCF for shorts or opens. (Refer to the Main Wire Harness Test Tables on
page 297.)
Replace components that fail test.
3. Make sure P106/CCF has a good connection at J106 on the CMX controller
board.
Connect P106 to the CMX controller board.
4. Inspect for obstructions of airways and vents.
Remove obstructions.
5. Power on the printer.
If the message appears, replace the CMX controller board. Record the
message and return it with the defective board.
084 POWER SUPPLY 48V FAILED
1. Power off the printer. Remove the paper guide assembly or pedestal top cover.
Check that power supply connector P101 is fully seated in connector J101 on the
CMX controller board.
Connect power supply connector P101 to J101 on the CMX controller
board.
2. If the printer has the coax/twinax expansion board, check the adapter connection
to the CMX controller board.
Make sure the 60-pin expansion adapter is correctly seated between the
CMX controller board and the coax/twinax expansion board.
3. Power on the printer.
If the message appears, replace the hammer bank logic cable assembly
(P108) and the power cable assembly (P105). (Refer to Appendix A.)
4. Power on the printer.
Troubleshooting 89