Ricoh FACSIMILE FAX77 Field Service Manual page 179

CN15 - OPU
Pin Name
Function
1 COM1 Ground
2 XMICIN Signal from microphone
3 1OPSID OPU status data
4 1OPSOD OPU drive data
5 5OPSCK OPU data clock
6 5OPMOD Chip select (H: OPP, L: OPP3)
7 - 5V
8 COM1
9 + 5V
CN16 - Speaker
Pin Name Function
1 MONISP Signal to speaker
2 COM1 Ground
CN17 - Modem
Pin Name Function
1 1RD Read enable
2 5WR Write enable
+ 5V
3 Supply from FCU
4 + 5V Supply from FCU
5 D6 Data bus
6 5MCS0 Chip select
7
D7 Data bus
8 A2 Address bus
9
10
11
V
12
0
13
14
15
16
5
17
18 5MCS1
19
20, 21
22 5G2CLK
23
24
25
V
26
0
27
0
28
29
30
31
32
V
33 1CABS1
2
34 1CABS2
5
35
5
36
5
37
1.5
38 XTXOUT
5
39
40
7-5
D5 Data bus
A0 Address bus
Not used
Not used
Not used
COM1 Ground
D3 Data bus
Not used
5CTS Clear to send (Active L)
Chip select
Ready to send
5RTS
Not used
G2 clock
D1 Data bus
Not used
Not used
+ 12V
Supply from FCU
A1 Address bus
D2 Data bus
D0 Data bus
A3 Address bus
D4 Data bus
Interrupt request
5MINT
Cable select
Cable select
Not used
Not used
- 12V Supply from FCU
Data for transmission
COM1 Ground
XRXIN Received data
0
5
5
5
12
5
0
0
-12
0
0
0