Service manual

UX-465L/C
UX-485LU
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.)
(UX-465L/C ONLY) 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
VOL A VOL B VOL C ON-HOOK ICM/OGM ICM/OGM
OUTPUT VALUE (GP02) (GP03) (GP04) Receiving MONITOR PLAY RINGER BUZZER DTMF/DP
X 0 1K 0 0 0 — HIGH HIGH HIGH — —
X 1 10K 1 0 0 HIGH MID 1 MIDDLE1 — — —
X 2 39K 0 1 0 MID 1 MID 2 MIDDLE2 — — —
X 3 100K 1 1 0 MID 2 MID 3 MIDDLE3 — — —
X 4 200K 0 0 1 MID 3 LOW LOW MIDDLE — —
X 5 300K 1 0 1 — — — — — FIXED
X 6 470K 0 1 1 LOW — — — FIXED —
X 7 750K 1 1 1 — — — LOW — —
VOLUME SETTING