Other Problems; The Machine Is Not Turned On, Or The Lcd Indication Does Not Appear; The Fan Motor 60 Assy Does Not Rotate; The Room Temperature Is High Or Low - Brother DCP-7055 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
5 Power switch holder failure
Low voltage power supply
6
PCB failure
7 Panel PCB failure
High voltage power supply PCB
8
failure
9 Main PCB failure

3.14.2 The fan motor 60 ASSY does not rotate.

Step
Harness connection failure of the
1
fan motor 60 ASSY
2 Fan motor 60 ASSY 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
1
unable to release the lock.
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 power switch holder.
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 fan motor
60 ASSY correctly.
Replace the fan motor 60 ASSY.
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
Execute the Function code 91 to reset the
security lock setting.
Replace the main PCB ASSY.
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