Sharp A260 Service Manual - Page 39

5. 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. 6. Signal/DTMF transmission level & receiving level • Signal transmission level setting: ATT -8 dB Circuit output: -11 dBm. • DTMF transmission level setting: HF -2.5 dBm LF -4.5 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] 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) TELMUTE Handset reception mute control signal H: Muting L: Muting cancel Handset receiver volume control signal RCVOL DTMFMUTE (The circuit is located in the control PWB.) Volume High Middle Low DTMF sending RCVOL L HH H DTMFMUTE L L H H Note: The DTMF sending listed above is DTMF signal sending in the handset OFF-HOOK mode. VOLUME SETTING LINEOUT A RCVOL DTME VOL A VOL B (HIGH) (LOW) MUTE Receiver volume setting Low Middle High DTMF Transmission Fixed volume setting (Receiver) Key buzzer volume setting Fixed Speaker volume setting Level1 Level2 Level3 Level4 Level5 Ringer volume setting Low Middle High DTMF speaker volume Level1 setting Level2 Level3 Level4 Level5 OGM playback speaker Level1 volume setting Level2 Level3 Level4 Level5 ICM record speaker Level1 volume setting Level2 Level3 Level4 Level5 1 1 1 0 0 0 1 1 1 1 0 1 0 0 1 1 0 1 1 0 1 1 0 0 0 0 1 0 1 0 1 0 1 0 1 0 0 0 1 1 0 1 1 0 0 0 0 0 1 1 0 1 1 0 0 0 VOL C 1 1 1 0 0 0 1 1 0 1 1 1 1 1 1 0 0 0 0 1 0 0 0 0 5 - 11 UX-A260U manuals4you.com