Cannot Update Firmware; The Machine Is Not Turned On - Brother DCP-L8400CDN Service Manual

4.14.3 Cannot update firmware

< User Check >
- Check if other function is being in process.
- Turn the power OFF/ON.
Step
1
2

4.14.4 The machine is not turned ON

< User Check >
- Turn the power OFF/ON.
- Properly insert the AC cord.
Step
1
2
3
4
5
6
7
8
Cause
Firmware version does not
match
Main PCB failure
Cause
Connection failure of the
panel PCB harness
Connection failure of the LCD
flat cable
Connection failure of the
low-voltage power supply
PCB harness
Disconnection of AC cord
Panel PCB failure
LCD failure
Low-voltage power supply
PCB failure
Main PCB failure
Reinstall the latest versions of all the
firmwares in the order of the sub firmware,
panel firmware, main firmware, and
high-voltage firmware.
(The panel firmware is available only for the
model with touch panel.)
Replace the main PCB ASSY.
Reconnect the panel PCB harness.
Reconnect the LCD flat cable.
Reconnect the low-voltage power supply
PCB harness.
Replace the AC cord.
Replace the panel PCB unit.
Replace the LCD.
Replace the low-voltage power supply PCB
unit.
Replace the main PCB ASSY.
2-134
Remedy
Remedy
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