Other Problems; The Machine Is Not Turned On, Or The Lcd Indication Does Not Appear; Fuser Fan Does Not Rotate; The Room Temperature Is High Or Low - Brother DCP-7057 Service Manual

3.14 Other Problems

3.14.1 The machine is not turned ON, or the LCD indication does not appear

Step
1 AC cord failure
Harness connection failure of panel
2
PCB ASSY
3 Harness connection failure of LCD
4 LCD failure
Low voltage power supply
5
PCB failure
6 Panel PCB failure
High voltage power supply PCB
7
failure
8 Main PCB failure

3.14.2 Fuser fan does not rotate

Step
Harness connection failure of the
1
fuser fan
2 Fuser fan failure
Harness connection failure of high
3
voltage power supply PCB
High voltage power supply PCB
4
ASSY failure
5 Main PCB failure

3.14.3 The room temperature is high or low

User Check
• Adjust the room temperature to 10 °C to 30 °C.
• Check if the exhaust opening is blocked.
Step
1 Internal temperature sensor failure
2 Main PCB failure

3.14.4 Problem associated with Secure Function Lock

User Check
• The administrator of this machine is requested to release the security lock.
Step
Forgot the password (PIN code) and
unable to release the lock.
1
2 Main PCB failure
Cause
Cause
Cause
Cause
2-104
Remedy
Replace the AC cord.
Reconnect the panel PCB ASSY harness.
Reconnect the LCD harness.
Replace the LCD.
Replace the low voltage power supply
PCB ASSY.
Replace the panel PCB ASSY.
Replace the high voltage power supply
PCB ASSY.
Replace the main PCB ASSY.
Remedy
Reconnect the harness of the fuser fan
correctly.
Replace the fuser fan.
Reconnect the harness of the high
voltage power supply PCB ASSY.
Replace the high voltage power supply
PCB ASSY.
Replace the main PCB ASSY.
Remedy
Replace the Internal temperature sensor.
Replace the main PCB ASSY.
Remedy
Press the [MENU] button in the ready
state, and then press the [#], [2], [7], [9],
[0], and [0] in this order to reset the
security lock setting.
Replace the main PCB ASSY.
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