Instruction manual

3–21Troubleshooting
POWER SUPPLY HOT
NOTE: The printer has sensor circuits that sample the operating temperature
of key print components. When higher than normal temperatures are
sensed, print speed is automatically reduced. If the printer runs at
reduced speed for an extended period of time, a (UNIT) HOT
message is sent to the LCD and printing stops, allowing printer
components to cool down. Pressing the CLEAR key resumes the
print task. Check the operating environment. A severe environment
is one with an ambient temperature consistently above 40° Celsius
(104° Fahrenheit) or is dirty enough to create blockage of the
cabinet fan vents. If the printer is located in such an environment,
consider relocating it to a cooler, cleaner area or reducing the size
and duration of the print jobs.
Instruction Indication Yes No
1. Press the CLEAR key.
“POWER SUPPLY HOT”
message.
Go to step 2. Return printer to
normal operation.
2. Cycle power: Power off
printer. Wait 15 seconds.
Power on printer.
“POWER SUPPLY HOT ”
message.
Go to step 3. Return printer to
normal operation.
3. Run a diagnostic printer test.
“POWER SUPPLY HOT”
message.
Go to step 4. Return printer to
normal operation.
4. a) Power off the printer.
b) Remove the paper path.
c) Check that the power
supply guard/air deflector is
correctly positioned over the
power supply board.
d) WARNING: DO NOT
TOUCH the power supply,
but hold your hand close
enough to check for heat
radiating off the board.
Power supply is noticeably hot. Go to step 5. Replace power
supply board.
5. Verify that all fan cable
connectors are connected.
(See
Appendix A,
Interconnect Diagram.)
Fan cables are properly
connected.
Go to step 6. Connect fan cable
connector(s).
6. a) Power on the printer.
b) Verify that all fans operate.
c) Power off printer.
Fans are OK. Go to step 7. Replace defective
fan(s).