High Temperature Error; Low Temperature Error; High Voltage Error - Tektronix Phaser 550 Service Manual

4. Is the left door open switch's wiring harnesses properly connected to
the engine driver board (CN312 – 24V interrupt)? In the case of the
Lower Tray Assembly, is the printer properly seated onto the Lower
Tray Assembly with good electrical connection. Try reseating the
printer. Check the lower feeder's wiring harness to the engine driver
board at connector CN310.
5. Replace the left door open switch.
6. Replace the engine driver board.

High temperature error

1. Replace the power supply unit.
2.
Replace the engine control board.

Low temperature error

1. Ensure the fuser is properly installed.
2. Check the fuser installed switch.
3.
Replace the fuser.
4. Replace the power supply unit.
5. Replace the engine control board.

High voltage error

1.
Replace the high voltage board.
2. Inspect the high-voltage wiring.
3. Replace the imaging unit and check the printer for proper operation.
4.
Sequentially replace each toner cartridge and check the printer for
proper operation.
5. Ensure that excessive conductive grease has not migrated and shorted
a high-voltage contact to ground.
Troubleshooting
Service Manual 6-17
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