Ricoh FACSIMILE FAX77, Field Service Manual

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4. NCU
CN1 - Network
Pin Name Function V
1
L1 To/From the network
2 L2 To/From the network
3 T1 To/From the external phone
4 T2 To/From the external phone 0
5 GS Ground start terminal 0
CN2 - FCU
See FCU CN18. The pins are reversed. For
example, pin A1 on the FCU is pin A11 on
the NCU.
CN3 - Test Points
Pin Name Function
V
1 XL1 To/From the network
2
XL2 To/From the network
3 XTT1 To/From the external phone
4
XTT2 To/From the external phone 0
5. OPU
CN1 - FCU
See FCU CN15.
CN2 - B4 Document Width Sensor (SB-3) -
Asia only
Pin Name Function
V
1
5SB3B SB-3 output (L: Paper present) 0
2
+ 5V Supply 1
3 COM1 Ground
0
7-7