Xerox 1235/DX Service Guide - Page 40
Engine SRAM Error U4 Power Off/On, Engine EPROM Missing U3 Power Off/On
UPC - 042215474542
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Printer fault messages Code Front panel message Service message T1 Fuser Upper Error T1 Power Off/On T1-Fuser Upper Error T2 Fuser Lower Error T2 Power Off/On T2-Fuser Lower error 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 U0-Engine ROM Error U1 Engine RAM Error U1 Power Off/On U1-Engine RAM Error U2 Engine EPROM Error U2 Power Off/On U2-Engine EPROM Error U3 Engine EPROM Missing U3 Power Off/On U3-Engine EPROM Missing U4 Engine SRAM Error U4 Power Off/On U4-Engine SRAM Error U5 Engine Control Error U5 Power Off/On U5-Engine Control Error 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 U6-Power Supply Error 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 U7-Feeder Home Error 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 U8-Controller Fan Error 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 U9-Supply Fan Error 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 Guide 27