Brother HL-4570CDW - Others Problems; The Fan Does Not Work (Error Code 2 B, EC); The Printer Is Not Turned ON, or the LCD Indication Does Not Appear

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Confidential
3.8 Others Problems
3.8.1 The printer is not turned ON, or the LCD indication does not appear
3.8.2 The fan does not work (Error code 2B, EC)
Step Cause Remedy
1 AC cord failure Replace the AC cord.
2 Harness connection failure of
panel PCB ASSY
Reconnect the panel PCB ASSY harness.
3 Harness connection failure of
LCD
Reconnect the LCD harness.
4 LCD failure Replace the LCD ASSY.
5 Power switch holder failure Replace the power switch holder.
6 Low-voltage power supply
PCB failure
Replace the low-voltage power supply PCB
ASSY.
7 Panel PCB failure Replace the panel PCB ASSY.
8 Engine PCB failure Replace the engine PCB ASSY.
9 High-voltage power supply
PCB failure
Replace the high-voltage power supply PCB
ASSY.
10 Main PCB failure Replace the main PCB ASSY.
Step Cause Remedy
1 Harness connection failure of
the appropriate fan
Reconnect the harness of the appropriate fan
correctly.
2 Failure of the appropriate fan Replace the appropriate fan.
3 Engine PCB failure Replace the engine PCB ASSY.
4 High-voltage power supply
PCB failure
Replace the high-voltage power supply PCB
ASSY.
5 Low-voltage power supply
PCB failure
Replace the low-voltage power supply PCB
ASSY.
6 Main PCB failure Replace the main PCB ASSY.