Tektronix Z740/N - Phaser 740 Color Laser Printer Service Manual page 36

Print engine service error codes
Error code
33
40
41
42
43
50
Meaning of error code and what to do about it
Paper transfer roller movement error.
1. Inspect the first drive gear (white joint gear) in the paper feeder.
Are any of its teeth broke?
2. Ensure the second bias transfer roller is in its lower position.
3. Check that the transfer roller sensor flag properly interrupts its
sensor.
4. Does the transfer roller clutch and stop plate operate correctly?
5. Inspect the wiring harness leading from the paper feeder to
CN20 of the engine control board.
6. Replace the paper feeder.
7. Replace the engine control board.
Fuser low temperature low error.
1. Is the fuser cold? The thermal fuse may be blown or lamp may
be broken. Check the fuse. Replace the fuser.
2. Inspect the wiring harness leading from the fuser to CN25 of the
engine control board.
3. Replace the power supply.
4. Replace the engine control board.
Fuser high temperature error.
1. Replace the fuser.
2. Inspect the wiring harness leading from the fuser to CN25 of the
engine control board.
3. Replace the engine control board.
4. Replace the power supply.
Fuser thermistor open.
1. Ensure the fuser is properly installed and firmly seated in place.
2. Replace the fuser.
3. Inspect the wiring harness leading from the fuser to CN25 of the
engine control board.
4. Replace the engine control board.
Fuser temperature rising too slow error.
1. Remove and reinstall the fuser. Insert it smoothly and solidly,
with force, into place. Secure it with its thumbscrew.
2. Ensure the fuser is the correct type for the printer a 220 volt
fuser installed in a 110 volt printer produces an Error 43.
Replace the fuser.
3. Inspect the wiring harness leading from the fuser to CN25 of the
engine control board.
4. Replace the engine control board.
5. Replace the power supply.
Power supply fan error.
1. Is +24 VDC being supplied to the fan from the control board
connector CN30 pins 1 and 2? If it is, replace the fan. If not,
replace the power supply.
Service Guide
25