Oki OKIOFFICE44 Service Manual page 301

A3.12 CTR (PC Interface Unit) Circuit Diagram
CTR board is used as an interface board of PC and FAX when PC is connected to facsimile machine.
1. Block diagram
CTR board circuit is formed by Receiver, Driver, and 1284-I/F.
Figure A3.12.1 shows related signals of CTR board.
CPU
IC2
IOGA
Figure A3.12.1 Related Signals of P050 (PC interface unit)
Board Descriptions
R44/17
BACKI
AD0 to AD7
RD-N, WRL-N
CASL-N,
CLK
BRE0O
BRE0I
PSBN
VEROP
FLT-N
SELP
ACK-N
BSYP
IPRN
AFXN
SLIN
BACKO
PD0 to PD7
AD8 to AD15
A - 59
CTR (option)
CN2
Driver
Receiver
1284-I/F
CN3
OKIOFFICE 44 Serv. Man., P/N 59276801
CN1
Host PC