Instruction manual

3–12 Troubleshooting
COIL 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. If the printer often prints at half speed, it may be
operating in a severe 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.
“COIL HOT * ” message. Go to step 2. Return printer to
normal operation.
2. Cycle power: Power off
printer. Wait 15 seconds.
Power on printer.
“COIL HOT * ” message. Go to step 3. Return printer to
normal operation.
3. Run “All Black” print test for
1/4 page.
“COIL HOT * ” message. Go to step 4. Return printer to
normal operation.
4. a) Power off the printer.
b) Remove the paper path.
c) 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).
5. 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).
6. Check for obstruction of
vents and fan airways.
Vents and airways are clear. Go to step 8. Remove
obstructions.
Make sure cabinet
exhaust fan vents
are not blocked.
(Check for items
beneath the
printer blocking
cabinet vents.)