Brother HL-1030, 1240, 1250 service manual Toner sensor light

CHAPTER 4 DISASSEMBLY AND RE-ASSEMBLY

(5)Disconnect the 11 (eleven) connectors for HL-1030/1240 or 12 (twelve) connectors for HL- 1250/1270N from the engine PCB to remove the engine PCB ASSY.

Toner sensor (light

Low-voltage power supply connector

reception) connector

Main PCB connector

Low-voltage power supply connector

Thermistor connector

(for HVPS)

Engine PCB ASSY

Fan motor connector

Polygon motor connector

Toner sensor (light

emission) connector

			Main motor connector
Solenoid connector
		Lower paper cassette connector
	Panel PCB
	connector	(HL-1250/1270N only)

Fig. 4-56

!CAUTION:

•Even if you want to remove only one of either the engine and high-voltage power supply PCBs, ensure you remove all screws securing both PCBs and disconnect the central connector while lifting both of them up. Failure to do so may damage the PCBs.

•When re-assembling the engine PCB, ensure it is aligned with the positioning boss first. Be careful the main motor harness is not caught between the engine PCB and the frame.

•When re-assembling the engine PCB or high-voltage power supply PCB, ensure the central connector is connected correctly.

•The engine PCB has been upgraded from the middle of September ’99 production to improve the print quality. As we supply both old and new versions of engine PCB, ensure that you replace the same version of the engine PCB. The old and new versions are incompatible each other. For details, refer to the parts reference list.

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