Canon W8400 Series, Service Manual, Page: 164 / 224

Chapter 6
6-14
6.1.5.2 Printhead error! (E04000)
0009-7122
<Cause>
This is displayed when a drive voltage error occurs in the printhead.
<Probable problem locations>
Printhead, carriage relay PCB, carriage unit, engine controller, system controller
<Remedy>
1. Replace the printhead.
2. Replace the carriage relay PCB.
3. Replace the carriage unit.
4. Replace the engine controller.
5. Replace the system controller.
6.1.5.3 Mist Count Error (E04001)
0010-0068
<Cause>
This is displayed when a full waste ink level is detected in the platen waste ink box and the mist fan unit.
<Probable problem locations>
platen waste ink box, mist fan unit, engine controller and system controller
<Remedy>
1.Replace the platen waste ink box and the mist fan unit.
After replacing the platen waste ink box and the mist fan unit, perform SERVICE MODE> INITIALIZE> MIST COUNT.
2. Replace engine controller.
3. Replace system controller.
6.1.5.4 Scale read error! (E04002)
0009-7123
<Cause>
This is displayed when the carriage sensor could not read the linear scale.
<Probable problem locations>
Linear scale, carriage sensor, carriage relay PCB, carriage unit, engine controller, system controller
<Remedy>
1. Visual check
Replace the linear scale if it is dirty, damaged, deformed, or otherwise does not function normally.
Remove any foreign objects adhering to the carriage sensor.
2. Cable connection check
Replace the cable between the carriage sensor and carriage relay PCB if the connection is not functioning normally.
3. Replace the carriage relay PCB.
4. Cable connection check
Replace the cable between the carriage relay PCB and engine controller if the connection is not functioning normally.
5. Replace the carriage unit.
6. Replace the engine controller.
7. Replace the system controller
6.1.5.5 Turn Power Off!! (S04010)
0009-7124
<Cause>
System controller RTC not found (S04010).
<Probable problem locations>
Lithium battery and system controller
<Remedy>
1. Replace engine controller.
6.1.5.6 Turn Power Off!! (E02777)
0009-7125
<Cause>
Communication error between system controller and engine controller.
<Probable problem locations>
Firmware, engine controller and system controller
<Remedy>
1. Update firmware.
2. Replace engine controller.
3. Replace system controller.