Unable To Perform Panel Operation - Brother DCP-L8400CDN Service Manual

4.6.2

Unable to perform panel operation

< User Check >
- Turn the power OFF/ON.
Step
1
2
3
4
5
6
7
8
9
10
11
Cause
The version of the panel
firmware and the main
firmware do not match.
Deviated adjustment of touch
panel
Connection failure of the key
PCB flat cable
Connection failure of the
panel PCB harness
Connection failure of the
touch panel flat cable
Connection failure of the
low-voltage power supply
PCB harness
Panel PCB failure
LCD failure
Key PCB failure
Low-voltage power supply
PCB failure
Main PCB failure
Install the latest panel firmware and main
firmware.
Refer to "1.3.21 Adjustment of touch panel
(Function code 61)" in Chapter 5
adjustments.
Reconnect the key PCB flat cable.
Reconnect the panel PCB harness.
Reconnect the touch panel flat cable.
Reconnect the low-voltage power supply
PCB harness.
Replace the panel PCB unit.
Replace the LCD.
Replace the panel cover ASSY.
Replace the low-voltage power supply PCB
unit.
Replace the main PCB ASSY.
2-117
Remedy
and perform
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