DP120F/DP125F Circuit Description
7-88
March 2000 © TOSHIBA TEC
The line monitor circuit consists of the CML relay (US/CA/TW: RLY2, EU/AU/ASIA/HK: RLY3),
analog switch (US/CA/TW: IC51, EU/AU/ASIA/HK: IC3), the I/OP-1 GA (IC7) and analog switches
(IC8, IC14) on the Main PBA, and other peripheral devices. It switches the telephone line path
with the analog switch and monitors the line status, ringer signal, and tone signal in facsimile
transmission and reception with the speaker connected to CN5 on the Main PBA. It also switches
the analog switch to output a buzzer tone from the speaker.
The signal to be monitored is selected by switching the analog switch (IC8) according to the
MONISEL signal, TONESEL signal, and RING/TONE signal which are output from the I/OP-1
GA.
To monitor the line during transmission and reception, the I/OP-1 GA causes the CML1 signal
to be HIGH to switch the analog switch and connect the line to the MODEM side.
For line path switching control, refer to "4. 1 Line Path Switching Control Circuit" in this chapter.
The correspondence between the respective signal levels and monitoring signals is shown in
the table below.
The monitoring signal selected by IC8 is input to the analog switch (IC14) to select an output
sound volume. The sound volume is selected by switching IC14 according to the SPVOL0-2
signals output from the I/OP-1 GA and selecting an input resistance for the monitoring signal.
The correspondence between the respective signals and sound volumes is shown in the table
below.
Monitoring signal
MONISEL
TONESEL
RING/TONE
LINE Monitor
Line 1
HIGH
HIGH
-
Line 2
LOW
HIGH
-
Ringer
-
LOW
HIGH
Alarm/Key touch Tone
-
LOW
LOW
Sound volume
SPVOL2
SPVOL1
SPVOL0
Silent (0)
LOW
LOW
LOW
Min. (1)
LOW
LOW
HIGH
(2)
LOW
HIGH
LOW
(3)
LOW
HIGH
HIGH
(4)
HIGH
LOW
LOW
(5)
HIGH
LOW
HIGH
(6)
HIGH
HIGH
LOW
Max. (7)
HIGH
HIGH
HIGH
Содержание DP120F
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Страница 316: ...March 2000 TOSHIBA TEC 7 7 DP120F DP125F Circuit Description 1 2 Block Diagram 07 01 10 Fig 7 1 7 ...
Страница 337: ...DP120F DP125F Circuit Description 7 28 March 2000 TOSHIBA TEC 3 1 Memory Circuit Fig 7 3 1 07 03 01 ...
Страница 387: ...DP120F DP125F Circuit Description 7 78 March 2000 TOSHIBA TEC EU AU ASIA HK models Fig 7 4 2 07 04 00E ...
Страница 401: ...DP120F DP125F Circuit Description 7 92 March 2000 TOSHIBA TEC 07 05 00 Fig 7 5 1 ...
Страница 579: ...March 2000 TOSHIBA TEC 9 15 DP120F DP125F Dialing and Communication Procedure b Standard procedure ...
Страница 654: ...DP120F DP125F Troubleshooting 11 42 March 2000 TOSHIBA TEC 2 3 Flow Chart Recommended for Field Service ...
Страница 655: ...March 2000 TOSHIBA TEC 11 43 DP120F DP125F Troubleshooting 2 4 Flow Chart Recommended for Telephone Screening ...
Страница 656: ...DP120F DP125F Troubleshooting 11 44 March 2000 TOSHIBA TEC ...
Страница 699: ...March 2000 TOSHIBA TEC 12 1 DP120F DP125F Appendix Chapter 12 Appendix 1 Sample List 1 1 Protocol Trace List ...
Страница 700: ...DP120F DP125F Appendix 12 2 March 2000 TOSHIBA TEC 1 2 Error Count List ...
Страница 701: ...March 2000 TOSHIBA TEC 12 3 DP120F DP125F Appendix 1 3 Function List for Maintenance ...
Страница 702: ...DP120F DP125F Appendix 12 4 March 2000 TOSHIBA TEC 1 4 Drum Unit ...
Страница 703: ...March 2000 TOSHIBA TEC 12 5 DP120F DP125F Appendix 1 5 Memory Dump List ...
Страница 706: ...SHUWA SHIBA PARK BLDG A 2 4 1 SHIBA KOEN MINATO KU TOKYO 105 8524 JAPAN ...