Tektronix Phaser 550 Service Manual page 135

Table 6-2 Print engine service error codes (cont'd.)
Error code Meaning of error code and what to do about it
22 Positioning error of the photoconductive belt.
1. Ensure that the imaging unit is properly installed and locked in place.
2. Ensure the tension lever of the imaging unit is set in the locking
position.
3. Inspect the wiring harnesses leading in and out of the charger sensor
board.
4. Replace the imaging unit.
5. Replace the engine control board.
6. Replace the charger sensor board.
30 Accumulator belt out of position.
1. Is there toner on the accumulator belt cleaning blade holder? (The
holder is located on the imaging unit, along the bottom of the green
OPC belt.)
2. Ensure that the imaging unit is properly installed and locked in place.
3. Inspect and clean the transparent plastic cover over the accumulator
belt position sensor. This sensor is located on the interior of the back
wall of the chassis.
4. Inspect the wiring harnesses leading in and out of the charger sensor
board.
5. Replace the imaging unit.
6. Replace the engine control board.
32 Accumulator belt cleaning blade movement error.
1. Inspect the cleaning blade (Iocated on the imaging unit, along the
bottom of the green OPC belt). Is it flipped up? If so, replace the
imaging unit.
2. lnspect the wiring harness leading from the cleaning board to CN302
of the engine driver board.
3. Replace the cleaning board.
4. Replace the engine driver board.
33 Paper transfer roller movement error.
1. Inspect the first drive 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 operate correctly?
5. Inspect the wiring harness leading from the paper feeder to CN309
of the engine control board.
6. Replace the paper feeder.
7. Replace the engine driver board.
40 Fuser low temperature low error.
1. Replace the fuser. The thermal fuse is blown or lamp is broken.
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.
41 Fuser high temperature error.
1. 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.
Troubleshooting
Service Manual 6-21
6