Error Code 20 - Fuser Lamp Overheat - Printronix L5535 Maintenance Manual

Chapter 4
Status Messages And Error Messages
b. Turn off power to the printer and check the continuity of the harness
4. Check the flash power supply and its harness.
With power to the printer off, check the continuity of the flash power
supply harness. If the continuity is OK, replace the flash power supply.
Error Code 20 — Fuser Lamp Overheat
1. Check that the fuser unit is installed properly.
2. Check the fuser unit air filter. If the filter is dirty, clean or replace it.
3. Check the fuser reflector cooling fan (FCF).
If the fan is working properly, go to step 4. If the fan does not turn:
a. Put the positive lead of a digital multimeter on pin 11 of connector
b. Measure the voltage with the printer powered up, which should be
c. If the voltage is 24V and the fan does not turn, turn off power to the
4. Check the lamp thermistor (LTS).
a. Turn off power to the printer and allow the fuser to cool completely (to
b. Disconnect harness connector CN14 from the MC board.
c. Measure the resistance between pin 1 of connector CN14 on the MC
d. If the resistance is OK, go to step 5. If the resistance is not OK, check
5. Replace the MC board.
I–152
from connector CN6 of the MC board to FP-J11 of the flash power
supply. If the continuity is OK, replace the MC board.
CHECKLIST:
FUSER UNIT
FUSER UNIT AIR FILTER
LAMP THERMISTOR (LTS) OR HARNESS
FUSER REFLECTOR COOLING FAN (FCF) OR
HARNESS
MC BOARD
CN15 on the MC board, and the negative lead on pin 12 of CN15.
about 24V.
printer and check the continuity of the harness between connector
CN15 on the MC board and JM15105.
If the continuity is OK, replace the FCF.
about 25° C or below).
board, and pin 2 of connector CN14. The resistance should be about
20 KΩ.
the continuity of the harness between connector CN14 on the MC
board and JM14101.
If the continuity is OK, replace the LTS.