Sharp FO-71 Service Manual page 56

FO-71RA
FO-51RA
[Signals for status recognition according to input signals]
Signal Name
H:The handset is in the on-hook state.
RHS
L: The handset is in the off-hook state.
CI Incoming call (CI) detection signal
[Other signals]
Signal Name
TELIN Receiving signal from line or modem
TXOUT Transmission (DTMF) analog signal output from
modem
RXIN Reception (DTMF, others) analog signal input
into modem
(Example: SENDING/RECEIVING)
LINE H
L
CML
CI DETECTOR
PC2
Q103
RX
TEL MUTE
(H:MUTE)
TX
HANDSET
MIC MUTE
(H:MUTE)
Q105
: FAX SENDING/RECEIVING
Function
Function
TEL/LIU PWB CONTROL PWB
IC102
TXOUT
RXIN
IC102
IC101
TEL IN
IC101
SPEAKER
SP MUTE
(H:MUTE)
+24VL
DG
NO Signal Name (CNLIUA)
1 RHS-
2 DG
3 +24VL
4 MICMUTE
5 TELIN
6 TELMUTE
SIGTX SPKRP
SP OUT
SIGRX
MICP
MIC
/LINE
SELECT
LINEIN
LINE IN ENABLE
MODEM BLOCK
(CX20438 I/A)
SPOUT
LINE
OUT
IC5
DTMFMUTE
RCVOL
SP MUTE
TEL MUTE
CI
CML
MIC MUTE
Fig. 6
5 – 11
NO Signal Name (CNLIUA)
7 RXIN
8 TXOUT
9 CML
10
11 N.C.(HS-)
12 TELOUT
RTLOOP
0,1
0,0
1,0
1,1
ENABLE
MIC ENABLE
LPF
0,20,25,30dB
LINE OUT ENABLE
LINE
SELECT
1,1
0,0
1,0
MUTE,0,-6,-12dB
IC2 SCE209
FAX CONTROLLER
CI
0,6dB
SIN
DAC DAC
ADC
0,+4dB
SOUT