IBM 6400 series Maintenance Manual page 88

Advise the user to move the printer to cooler, cleaner location.
2. Check the kinds of print jobs the user is running: look for very dense graphics
and layouts.
Advise the user to run jobs in smaller batches.
3. Power off the printer. Remove the paper guide assembly or pedestal top cover.
Check that the power supply guard/air deflector is correctly positioned over the
power supply board. CAUTION: DO NOT TOUCH THE POWER SUPPLY, but
hold your hand close enough to check for heat radiating off the power supply
board.
If the power supply is noticeably hot, replace it.
4. Check that all fan cables are connected.
Connect all fan cables.
5. Inspect vents and fan airways for obstructions. Look underneath cabinet models
for items blocking the cabinet exhaust vents.
Remove any obstructions from vents and airways.
6. Install paper guide assembly or pedestal top cover. Power on the printer. Load
paper. Run the "All E's" print test for 5–10 minutes.
If the message appears, replace the CMX controller board. Record the
message and return it with the defective board.
081 POWER SUPPLY VOLTAGE FAILURE
1. The power supply has failed.
Replace the power supply board.
2. Power on the printer.
If the message appears, replace the CMX controller board.
082 POWER SUPPLY 8.5V FAILED
1. 8.5 Volt Power Failed. Internal power failure.
Cycle power. If the message appears, replace the power supply board.
2. Power on the printer.
If the message appears, replace the CMX controller board. Record the
message and return it with the defective board.
3. Power on the printer.
88 Troubleshooting