Sharp UX-108 Service Manual

UX-108U/178U/188U
FO-375U
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 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 -10 dB Circuit output: -12
dBm.
• DTMF transmission level setting: HF -3.5 dBm LF -5.0 dBm
Thus, set the level.
• Attenuation in the LIU section of the receiving level is degigned at
-6 dBm. (The modem and circuit error are not included.)
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
RCVOL1
RCVOL2
(The circuit is located
in the control PWB.)
Three stage switching.
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
TXOUT mute 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
in the control PWB.) L: When monitoring line signal
Volume High Middle DTMF sending and LOW
RCVOL1 HL L
RCVOL2 LH L
VOL A VOL B
RING./
Buzzer DTMF
Receiving
HH———
H L High — High
L H Middle — Middle
L L Low Fixed Low
7. 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

Sharp UX-108 Specifications

General

Brand	Sharp
Model	UX-108
Category	Fax Machine
Language	English