Troubleshooting Of The Control Panel; Nothing Is Displayed On The Lcd; The Control Panel Does Not Work - Brother 09055CDN Service Manual

3.11 Troubleshooting of the Control Panel

3.11.1 Nothing is displayed on the LCD

<User Check>
- Verify if the power switch is turned off.
- Check if the machine is in the Deep Sleep mode. (Touch panel model)
Step
1
2
3
4
5
6
7
8
9

3.11.2 The control panel does not work

<User Check>
- Check whether the function lock is not set.
- Turn OFF and ON the power switch.
Step
1
2
3
4
5
6
Cause
AC cord failure
Connection between main
PCB and panel PCB
Connection between main
PCB and low-voltage power
supply PCB
Inlet Harness ASSY failure
LCD or LCD unit failure
Panel PCB failure
High-voltage power supply
PCB failure
Low-voltage power supply
PCB failure
Main PCB failure
Cause
Assembling failure of the
panel unit
Connection between main
PCB and panel PCB
Rubber key failure
Fine adjustment of touch
panel misalignment (for
models with a touch panel)
Panel PCB failure
Main PCB failure
Replace the AC cord.
Connect the connector between the main
PCB ASSY and panel PCB ASSY correctly.
Connect the connector between the main
PCB ASSY and low-voltage power supply
PCB ASSY correctly.
Replace the inlet harness ASSY.
Replace the LCD or LCD unit.
Replace the panel PCB ASSY.
Replace the high-voltage power supply PCB
ASSY.
Replace the low-voltage power supply PCB
ASSY.
Replace the main PCB ASSY.
Re-assemble the panel unit.
Connect the connector between the main
PCB ASSY and panel PCB ASSY correctly.
Replace with the normal rubber key.
Perform the fine adjustment of touch panel.
(Function code
Replace the panel PCB ASSY.
Replace the main PCB ASSY.
2-134
Remedy
Remedy
61)
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