Service manual

UX-340L/UX-345L
UX-330L
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 & receiving level
• Signal transmission level setting: ATT -8 dB Circuit output: -11 dBm.
• DTMF transmission level setting: HF -4.5 dBm LF -6.5 dBm
Thus, set the level.
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
Speaker tone mute control signal
SP MUTE H: Muting (Power down mode)
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.
Speaker volume control signal,
VOL A VOL A VOL B matrix
VOL B
(The circuit is located
in the control PWB.)
TXCONT
Handset transfer mute control signal
(The circuit is located
H: Signal sending, when transmitting
in the control PWB.)
L: During reception, transmission mute,
(during standby)
GAIN-C Reception gain switching signal
(The circuit is located H: When connected to line, 1: 1 gain
in the control PWB.) L: When not connected to line, HIGH gain
BZCONT Speaker output signal switching
(The circuit is located H: Buzzer signal output (during stand by)
in the control PWB.) L: When monitoring line signal
RCVCL Volume DTMF/DP
H Middle Fixed/—
L high —
VOL A VOL B
RING.
Buzzer DTMF
Receiving
HH———
LH
Low
—
Low
H L Middle Fixed Middle
LL
High — High
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]
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