Brother HL-L3210CW - Troubleshooting for Control Panel Problems; Nothing Is Displayed on the LCD; Nothing Is Displayed on the LED; Unable to Perform Panel Operation

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Confidential
4.6 Troubleshooting for Control Panel Problems
4.6.1 Nothing is displayed on the LCD
<User Check>
• Turn the power switch OFF and then back ON again.
• Unplug the AC cord and then plug it again.
* Panel flat cable (Touch panel models) / Panel harness (Non-touch panel models)
4.6.2 Nothing is displayed on the LED
<User Check>
• Turn the power switch OFF and then back ON again.
* Panel flat cable (Touch panel models) / Panel harness (Non-touch panel models)
4.6.3 Unable to perform panel operation
<User Check>
• Turn the power switch OFF and then back ON again.
* Panel flat cable (Touch panel models) / Panel harness (Non-touch panel models)
Step Cause Remedy
1
Connection failure of the
panel flat cable/harness*
Reconnect the panel flat cable/harness*.
2
Connection failure of the low-
voltage power supply harness
Reconnect the low-voltage power supply
harness.
3
Connection failure of the high-
voltage power supply flat cable
Reconnect the high-voltage power supply flat
cable.
4 AC cord failure Replace the AC cord.
5
Panel flat cable/harness* failure Replace the panel flat cable/harness*.
6 Panel PCB failure Replace the panel PCB.
7 LCD failure Replace the LCD.
8
Low-voltage power supply
PCB failure
Replace the low-voltage power supply PCB.
9 Main PCB failure Replace the main PCB.
Step Cause Remedy
1
Connection failure of the
panel flat cable/harness*
Reconnect the panel flat cable/harness*.
2 Panel PCB failure Replace the panel PCB.
3 Main PCB failure Replace the main PCB.
Step Cause Remedy
1
Connection failure of the low-
voltage power supply harness
Reconnect the low-voltage power supply
harness.
2
Panel flat cable/harness* failure Replace the panel flat cable/harness*.
3 Panel PCB failure Replace the panel PCB.
4 Touch panel ASSY failure Replace the touch panel ASSY.
5
Low-voltage power supply
PCB failure
Replace the low-voltage power supply PCB.
6 Main PCB failure Replace the main PCB.