Tektronix Phaser 550 Service Manual page 136

6
Troubleshooting
6-22 Phaser 550 Color Printer
Table 6-2 Print engine service error codes (cont'd.)
Error code Meaning of error code and what to do about it
42 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 CN12 of the
engine control board.
4. Replace the engine control board.
43 Fuser temperature rising too slow error.
1. Remove and reinstall the fuser. Insert it smoothly and solidly, with
force, into place.
1. 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.
2. Inspect the wiring harness leading from the fuser to CN12 of the
engine control board.
3. Replace the engine control board.
4. Replace the power supply.
50 Power supply fan error.
Is +24 VDC being supplied to the fan from the engine power supply's
CN853 pins 1 and 2? If it is, replace the fan. If not, replace the power
supply.
51 Ozone fan error.
1. Is +24 VDC being supplied to the fan from the engine control board's
CN14 pins 1 and 2? If it is, replace the fan. If not, replace the engine
control board.
61 Toner cartridge drive motor lost sync.
1. Are the toner cartridges properly installed and locked in position?
2. Does each toner cartridges developer roller rotate when driven by
the motor? If not replace the toner cartridge.
3. Does the toner cartridge motor rotate? Check the main motors
wiring harness to the engine driver board at CN305. If the wiring
checks out, replace the toner cartridge motor.
4. Replace the engine driver board.
62 Paper feed motor lost sync.
1. Rotate the fuser knob. If the torque required is too high, replace the
fuser. Either it ran out of oil or the oil pump is not functioning.
2. Does the paper feed motor run and generate torque?
3. Does the gear train of the paper feeder rotate properly?
4. Does the gear train of the fuser rotate properly?
5. Does the gear train of the paper eject rollers rotate properly?
6. Inspect the wiring harness leading from the paper feed motor to
connector CN306 of the engine driver board.
7. Replace the paper feed motor.
8. Replace the engine driver board.?
63 Main motor lost sync.
1. Is the imaging unit properly installed and locked in position?
2. Do the photoconductive and accumulator belts rotate when driven
by the main motor? If not replace the imaging unit.
3. Does the main motor rotate? Check the main motors wiring harness
to the engine driver board at CN313. If the wiring checks out, replace
the main motor.
4. Replace the engine driver board.