Engine I/O - Brother 1240 Service Manual

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.)

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.
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. 3-22
Fig. 3-23
Fig. 3-24
3-17
CHAPTER 3 THEORY OF OPERATION