Brother International IntelliFax-3550 Service Manual - Page 40

Connector for the NCU PCB, NCU relay ON/OFF signal

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1 3 2-1 2 3-1 2-2 2-3 2-4 2-7 2-5 2-6 4-2 4-1 3-2 4 Main PCB Circuit Diagram 7/7 1 Connector for the NCU PCB CMLL: NCU relay ON/OFF signal PLS: Dial pulse output TLOF: Off-hook signal which is active Low for the external telephone. CI: Call signal which is active Low. TXD: Line output signal from the MODEM TLSL: Handset microphone signal RL1: Line input signal to the MODEM RL2: Line monitor signal ADLC: Line current detection input DASEND: Output level matching signal DAST: Side tone level matching signal (Only in the European versions.) DPS: External telephone switching signal EAT: Earth function signal POL: Polarity inversion detection signal III - 21

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III –
21
Main PCB Circuit Diagram 7/7
1
Connector for the NCU PCB
CMLL:
NCU relay ON/OFF signal
PLS:
Dial pulse output
TLOF:
Off-hook signal which is active Low for the external telephone.
C
I
:
Call signal which is active Low.
TXD:
Line output signal from the MODEM
TLSL:
Handset microphone signal
RL1:
Line input signal to the MODEM
RL2:
Line monitor signal
ADLC:
Line current detection input
DASEND:
Output level matching signal
DAST:
Side tone level matching signal
(Only in the European versions.)
DPS:
External telephone switching signal
EAT:
Earth function signal
POL:
Polarity inversion detection signal
1
2
2
-1
2
-2
2
-3
2
-5
2
-6
2
-4
2
-7
3
3
-1
3
-2
4
4
-1
4
-2