Sharp FACSIMILE UX-108 Service Manual page 53

[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
TEL IN Receiving signal from line or modem
TEL OUT Transfer signal to line
SPOUT Speaker output signal
Transmission (DTMF) analog signal output
TXOUT
from modem
Reception (DTMF, others) analog signal input
RXIN
into modem
(Example: Fax signal send)
CML
H
TEL
LINE
L
CI DETECTOR
EXT.
HANDSET
SPEAKER
Function
Function
TEL/LIU PWB
CML
DP GEN.
RX MUTE
TEL IN
TELOUT
VOL A
DP ON
CI
RHS
+5V
+24VA
DG
NO Signal Name (CNLIUA)
1
2
3
4
5
6
NO Signal Name (CNLIUB)
1
2
8. Cl detection circuit
The CI detection circuit detects the CI signals. A CI signal, which is pro-
vided to the photo-coupler PC6 through the C4 (0.56 µF), R2 (10 K),
and ZD3 when the ring signal is inputted from the telephone line.
9. Power supply and bias circuits
The voltages of +5V and +24VA are supplied from the control PWB unit.
CONTROL PWB
TXOUT
RXIN
VOL B
VOL C
BZCONT
0
1
Fig. 6
5 – 10
NO
TELOUT 7
TELIN 8
TELMUTE 9
CI 10
HS 11
RHS 12
NO
3
RXMUTE
DPON
4
TXCONT
SIGTX
1
0
0
SIGRX
1
UX-108DE
Signal Name (CNLIUA)
RXIN
TXOUT
CML
+24VA
+5V
DG
Signal Name (CNLIUB)
DPMUTE
E-RLY
MODEM
(R96DFXL-CID)
CML
TXCONT
GAIN-C
XFC3
RX MUTE
SP MUTE
BZCONT
DP ON
CI
RHS