Brother service manual HL-1250/1270N, Engine I/O HL-1030/1240

CHAPTER 3 THEORY OF OPERATION

HL-1250/1270N

The reset IC is a RN5VD42A. The reset voltage is 4.2V (typ.) and the LOW period of reset is 80ms (typ.)

Fig. 3-22

1.3.10 Engine I/O

HL-1030/1240

Fig. 3-22 shows the engine interface circuit. The interface with the engine PCB is by full- duplex synchronous serial method.

Fig. 3-23

HL-1250/1270N

Fig. 3-23 shows the engine interface circuit. The interface with the engine PCB is by full- duplex synchronous serial method.

Fig. 3-24

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