Nothing Is Displayed On The Led; Control Panel Is Inoperable - Brother HL-L5000D Service Manual

4.6.2 Nothing is displayed on the LED

<User Check>
- Turn the power switch OFF and then ON again.
Step
Connection failure of the key PCB
1
flat cable
Panel PCB failure (Non touch panel
2
models only)
Key PCB failure (Touch panel
3
models only)
4 Main PCB failure

4.6.3 Control panel is inoperable

<User Check>
- Turn the power switch OFF and then ON again.
Step
Rubber key attachment failure
1
(Non touch panel models only)
Connection failure of the panel PCB
2 flat cable (Non touch panel models
only)
Connection failure of the low-
3
voltage power supply harness
Panel PCB failure (Non touch panel
4
models only)
Touch panel failure
5
(Touch panel models only)
6 Key PCB failure
Low-voltage power supply PCB
7
failure
8 Main PCB failure
Cause
Reconnect the key PCB flat cable.
Replace the panel PCB ASSY.
Replace the LCD panel ASSY.
Replace the main PCB ASSY.
Cause
Reattach the rubber key.
Reconnect the panel PCB flat cable.
Reconnect the low-voltage power supply
harness.
Replace the panel PCB ASSY.
Replace the LCD panel ASSY.
Replace the panel cover case upper.
Replace the low-voltage power supply PCB
ASSY.
Replace the main PCB ASSY.
2-113
Remedy
Remedy
Confidential