Sharp FO-77

FO-77U
UX-66U
5. Externally connected TEL OFF HOOK detection circuit section
• The circuit current detection is turned on together with OFF HOOK
of main body or OFF HOOK of externally connected TEL. ON of
CML OFF (HS=L) is judged as OFF HOOK of externally connected
TEL.
6. CI detection circuit
• CI is detected by the photocoupler which is integrated in series in
the primary side TEL circuit well proven in the existing unit.
7. Signal/DTMF transmission level
• Signal transmission level setting: ATT -10 dB Circuit output: -12
dBm.
• DTMF transmission level setting: HF -3.5 dBm LF -5.0 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]
5 – 10
Signal Name Description
CML
Line connecting relay and DP generating relay
(The circuit is located H: Line make
in the TEL/LIU PWB.) L: Line break
SP MUTE Speaker tone mute control signal
(The circuit is located H: Muting (Power down mode)
in the TEL/LIU PWB.) L: Muting cancel (Normal operation)
Handset reception mute control signal
TEL MUTE H: Muting
L: Muting cancel
Handset receiver volume control signal
RCVOL
(The circuit is located
in the control PWB.) Note: The DTMF sending listed above is DTMF signal
sending in the handset OFF-HOOK mode.
Volume High Low DTMF sending and LOW
RCVOL LH H
VOLUME SETTING
LINEOUT A RCVOL
(HIGH) (LOW)
Receiver volume setting Low 1
High 0
DTMF Transmission Fixed 1
volume setting (Receiver)
Key buzzer volume setting Fixed
Speaker volume setting Low 1 1
Middle 1 0
High 0 1
Ringer volume setting Low 1 1
Middle 1 0
High 0 1
DTMF speaker volume setting Low 1 1
Middle 1 0
High 0 1