Sharp A260 - UX B/W Thermal Transfer Service Manual page 39

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
CML Line connecting relay and DP generating relay
H: Line make
(The circuit is located
L: Line break
in the TEL/LIU PWB.)
SP MUTE Speaker tone mute control signal
H: Muting (Power down mode)
(The circuit is located
L: Muting cancel (Normal operation)
in the TEL/LIU PWB.)
Handset reception mute control signal
TELMUTE H: Muting
L: Muting cancel
Handset receiver volume control signal
Volume
RCVOL
DTMFMUTE RCVOL
(The circuit is located
DTMFMUTE
in the control PWB.)
Note: The DTMF sending listed above is DTMF signal
sending in the handset OFF-HOOK mode.
VOLUME SETTING
Receiver volume setting Low
Middle
High
DTMF Transmission Fixed
volume setting (Receiver)
Key buzzer volume setting Fixed
Speaker volume setting Level1
Level2
Level3
Level4
Level5
Ringer volume setting Low
Middle
High
DTMF speaker volume Level1
setting Level2
Level3
Level4
Level5
OGM playback speaker Level1
volume setting Level2
Level3
Level4
Level5
ICM record speaker Level1
volume setting Level2
Level3
Level4
Level5
LF -4.5 dBm
Description
High
Middle Low DTMF sending
L H H H
L L H H
LINEOUT A RCVOL DTME VOL A VOL B
(HIGH) (LOW) MUTE
1 1
1 0
0 0
1 1
VOL C
1 1 1
0 1 1
0 0 1
1 1 0
0 1 0
1 0 0
1 1 1
0 0 1
0 0 0
1 0 1
1 0 1
1 0 1
1 0 1
1 0 1
0 0 1
1 1 0
0 1 0
1 0 0
0 0 0
0 0 1
1 1 0
0 1 0
1 0 0
0 0 0
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UX-A260U