Panasonic UF-580 Service Manual page 69

CN18
SC PCB
Signal Name
Pin No.
CN18-1 L2 (T)
CN18-3 L1 (R)
CN18-6 +24V
CN18-7 +5VP
CN18-8 GND
CN18-9 pCMLD
CN18-10 pCTON
CN18-11 pHKOF
CN52
SC PCB
Signal Name
Pin No.
CN52-1 TH1
CN52-2 TH2
Destination
MJR PCB
CN28-1
MJR PCB
CN28-3
MJR PCB
CN29-1
MJR PCB
CN29-2
MJR PCB
CN29-3
MJR PCB
+5V(H)
CN29-4
MJR PCB
above +3V(H) Ring Detected
CN29-5
MJR PCB
+5V(H)
CN29-6
Destination
Thermistor
Assembly
Thermistor
Assembly
Signal Waveform
0V(L)
0V
0V(L)
Signal Waveform
69
Function
Line Transformer Input
Signal
Ground
0V
+24 VDC Power Supply
+24V
+5 VDC Power Supply
+5V
Ground
0V
Line Switching Relay Drive
Signal
H : CML On
L : CML Off
Ring Detection Signal
H : Ring Detected
L : Ring Not Detected
External Phone Off-Hook
Detection Signal
(Phone Line must be
connected)
H : Off Hook
L : On Hook
Function
Thermistor Output Signal
5V
0V
Thermistor Output Signal
5V
0V