Sharp UX-P200 Service Manual page 51

5. CI detection circuit
•
CI is detected by the photo coupler which is integrated in series in
the primary side TEL circuit well proven in the existing unit.
6. Signal/DTMF transmission level & receiving level
•
Signal transmission level setting: ATT -8 dB Circuit output: -11 dBm.
•
DTMF transmission level setting: HF -2.5 dBm
Thus, set the level.
4) Signal selection
The following signals are used to control the transmission line of TEL/
FAX signal. For details, refer to the signal selector matrix table.
[Control signals from output port]
Signal Name
LF -4.5 dBm
(The circuit is located
in the TEL/LIU PWB.)
SP MUTE
(The circuit is located
in the TEL/LIU PWB.)
TELMUTE
RCVOL
DTMFMUTE
(The circuit is located
in the control PWB.)
VOLUME SETTING
Receiver volume setting
DTMF Transmission
volume setting (Receiver)
Key buzzer volume setting Fixed
Speaker volume setting
Ringer volume setting
DTMF speaker volume
setting
5 – 10
CML Line connecting relay and DP generating relay
H: Line make
L: Line break
Speaker tone mute control signal
H: Muting (Power down mode)
L: Muting cancel (Normal operation)
Handset reception mute control signal
H: Muting
L: Muting cancel
Handset receiver volume control signal
Volume High
RCVOL L
DTMFMUTE L
Note: The DTMF sending listed above is DTMF signal
sending in the handset OFF-HOOK mode.
(HIGH) (LOW)
Low
High
Middle
Fixed
Low
Middle
High
Low
Middle
High
Low
Middle
High
UX-P100U
UX-P200U
Description
Middle Low DTMF sending
H H H
L H H
LINEOUT A RCVOL DTME
MUTE
1 1
0 0
1 0
1 1
1 1
1 0
0 1
1 1
1 0
0 1
1 1
1 0
0 1