Service manual

UX-510UA
FO-1470U
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 photo coupler which is integrated in series in
the primary side TEL circuit well proven in the existing unit.
7. Signal/DTMF transmission level & receiving 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 – 9
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
DTMFMUTE
(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 Middle Low
DTMF sending
RCVOL
LHL L
DTMFMUTE L L H H
VOLUME SETTING
LINEOUT A RCVOL DTME
(HIGH) (LOW) MUTE
Receiver volume setting Low 0 1
High 0 0
Middle 1 0
DTMF Transmission Fixed 0 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 Low 1 1
setting Middle 1 0
High 0 1