Reset Circuit; 1.3.10 Engine I/O; 1.3.11 Panel I/O; 1.3.12 Video I/O - Brother MFC-8220 Service Manual

CHAPTER 3 THEORY OF OPERATION
1.3.9

Reset circuit

The reset IC is a R3112N281C. The reset voltage is 2.8V (typ.) and the LOW period of reset is
22.4ms (typ.)

1.3.10 Engine I/O

The interface with the engine PCB is by full-duplex synchronous serial method, of which
transfer rate is 520kbps.

1.3.11 Panel I/O

The interface with the panel PCB is by full-duplex synchronous serial method.

1.3.12 Video I/O

The video signal output from the ASIC is reversed through a transistor and output after being
corrected by the buffer IC.
Fig. 3-11
Fig. 3-12
Fig. 3-13
Fig. 3-14
3-8