Tektronix 1235N - Phaser Color Laser Printer Service Manual page 41

Printer fault messages
Code Front panel message
T1 Fuser Upper Error T1 Power Off/On
T2 Fuser Lower Error T2 Power Off/On
1. Remove and install the fuser.
2. Test the thermistors inside the fuser using the test described in "Switch
scan test" on page 63.
3. Replace the fuser.
4. Replace the low-voltage power supply.
5. Replace the engine controller board.
U0 Engine ROM Error U0 Power Off/On
U1 Engine RAM Error U1 Power Off/On
U2 Engine EPROM Error U2 Power Off/On
U3 Engine EPROM Missing U3 Power Off/On
U4 Engine SRAM Error U4 Power Off/On
U5 Engine Control Error U5 Power Off/On
1. Turn the printer off and then on
2. Reset the printer NVRAM using the procedure "Resetting NVRAM" on
page 85.
3. Replace the engine controller board.
U6 Power Supply Error U6 Power Off/On
1. Inspect the main cooling fan. Ensure it is running correctly and is not
blocked.
2. Turn the printer off and then on.
3. Replace the low-voltage power supply.
4. Replace the engine controller board.
U7 Feeder Home Error U7 Power Off/On
1. Test the manual bypass feeder home sensor using the test described in
"Switch scan test" on page 63.
2. Inspect the sensor and its wiring harness.
3. Replace the engine controller board.
U8 Controller Fan Error U8 Power Off/On
1. Inspect the electrical chassis fan to see if it is running and not blocked.
2. Inspect the fan's wiring harness.
3. Replace the fan.
4. Replace the engine controller board.
U9 Supply Fan Error U9 Power Off/On
1. Inspect the main cooling fan to see if it is running and not blocked.
2. Inspect the fan's wiring harness.
3. Replace the fan.
4. Replace the engine controller board.
Service message
T1-Fuser Upper Error
T2-Fuser Lower error
U0-Engine ROM Error
U1-Engine RAM Error
U2-Engine EPROM Error
U3-Engine EPROM Missing
U4-Engine SRAM Error
U5-Engine Control Error
U6-Power Supply Error
U7-Feeder Home Error
U8-Controller Fan Error
U9-Supply Fan Error
Service Guide 27