Panasonic UF-890 Service Manual page 95

Pin No. Signal Name
CN23-3 HLIN2
CN23-4 NC
CN23-5 AI
CN23-6 AIS
CN25
Refer to FCB PCB CN3.
Destination
SRU PCB
CN90-2
SRU PCB
CN90-3
SRU PCB
CN90-4
On Hook
SRU PCB
CN90-5
Signal Waveform
Off Hook
+5V (H)
0V (L)
0V
95
Function
Line Signal for the Fax Handset
Not Connected
Switch Hook Signal
Ground