Brother HL 1230 - B/W Laser Printer Service Manual page 68

CHAPTER 3 THEORY OF OPERATION
HL-1450/1470N
The reset IC is a RN5VD42A. The reset voltage is 4.2V (typ.) and the LOW period of reset is
80ms (typ.)
1.3.9 Engine I/O
HL-1230/1440
Fig. 3-22 shows the engine interface circuit. The interface with the engine PCB is by full-
duplex synchronous serial method.
HL-1450/1470N
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
3-18