Brother International IntelliFax-3550 Service Manual - Page 38

Eraser lamp ON/OFF signal, ware malfunction.

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1 3 1-1 2 1-2 1-3 1-4 5 1-5 1-6 1-7 1-8 1-9 1-10 1-11 4 7 6 8 Main PCB Circuit Diagram 5/7 1 Connector for the relay PCB 1-1: Laser drive signals 1-2: High-voltage power supply control signals 1-3: Eraser lamp ON/OFF signal 1-4: Fan 1 control signal 1-5: Signal input from the paper ejection sensor 1-6: Signal input from the registration sensor 1-7: Signal input from the sheet feeder cover sensor 1-8: Signal input from the cover sensor 1-9: Signal input from the toner sensor 1-10: Signal input from the heater thermister 1-11: Signal input from the toner thermister 2 Heater control circuit which prevents the heater from overheating due to ASIC or software malfunction. (The ASIC controls the HTON signal with the hysteresis characteristics for stabilized heater control.) 3 Connector for the low-voltage power supply 4 Main motor driver which controls recording paper feeding and drum rotation. 5 Fan 2 driver circuit 6 Paper pull-in solenoid circuit 7 Scanner motor driver and its control circuitry 8 Signal input from the hook switch III - 19

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III –
19
Main PCB Circuit Diagram 5/7
1
Connector for the relay PCB
1
-1:
Laser drive signals
1
-2:
High-voltage power supply control signals
1
-3:
Eraser lamp ON/OFF signal
1
-4:
Fan 1 control signal
1
-5:
Signal input from the paper ejection sensor
1
-6:
Signal input from the registration sensor
1
-7:
Signal input from the sheet feeder cover sensor
1
-8:
Signal input from the cover sensor
1
-9:
Signal input from the toner sensor
1
-10:
Signal input from the heater thermister
1
-11:
Signal input from the toner thermister
2
Heater control circuit which prevents the heater from overheating due to ASIC or soft-
ware malfunction.
(The ASIC controls the HTON signal with the hysteresis characteris-
tics for stabilized heater control.)
3
Connector for the low-voltage power supply
4
Main motor driver which controls recording paper feeding and drum rotation.
5
Fan 2 driver circuit
6
Paper pull-in solenoid circuit
7
Scanner motor driver and its control circuitry
8
Signal input from the hook switch
1
2
3
4
5
6
7
8
1
-1
1
-2
1
-3
1
-4
1
-5
1
-6
1
-7
1
-8
1
-9
1
-10
1
-11