
R51
40672201TH Rev. 4
A3 - 4
A3.1.3
R51 Circuit Diagram (Page 3/12)
1.
Block diagram
The audio monitor circuit on page 3/12 that consists of IC11 (analog switch IC) and IC5
(amplifier) generates the following audio monitor.
•
Line monitoring
•
Buzzer signals
Figure A3.1.3 shows the block diagram of audio monitor circuit.
2.
Function
1)
Line monitoring
Send and receive signals are input from the transformer on the NCU board to this
circuit as a R signal and the signal power is input to the IC11. The IC11 adjusts
the monitor volume by MONC0, MONC1 and MONC2 signal under the control of
IOGA4. Output (high and low) from IC11 passes through the amplifier and is fed to
the speaker as a SP signal.
* MONC0/MONC1/MONC2 signal: Volume control signal.
Note: In case of transmission mode, the monitor will be available during dialing,
but the monitor will be switched off automatically after the elapse of specified
time (about 5 sec).
2)
Buzzer control
Alarm and other signals are input from IOGA4 to this circuit as BZ signals. The
various buzzer signals are sounded under the control of IOGA4 (CPU).
Figure A3.1.3 Block Diagram of Audio Monitor Circuit
IC11
IC2
IOGA4
IOGA4
RM
From MODEM
circuit
Analog
switch
IC5
Amplifier
CN9
1
2
Speaker
BZ
MONC1
MONC2
MONC0
0 V
0 VA
+5 V
0 VA
TR513
IC2
Содержание OKIOFFICE84
Страница 7: ...40672201TH Rev 4 CHAPTER 1 GENERAL INFORMATION...
Страница 44: ...40672201TH Rev 4 CHAPTER 2 INSTALLATION PROCEDURE...
Страница 120: ...40672201TH Rev 4 CHAPTER 3 BRIEF TECHNICAL DESCRIPTION...
Страница 128: ...40672201TH Rev 4 CHAPTER 4 MECHANICAL DISASSEMBLY AND REASSEMBLY...
Страница 133: ...4 5 40672201TH Rev 4 Appearance of the OKIOFFICE84 OKIFAX 4500 FX051 CP4 Fig 01...
Страница 155: ...40672201TH Rev 4 CHAPTER 5 ADJUSTMENTS...
Страница 159: ...40672201TH Rev 4 CHAPTER 6 CLEANING AND MAINTENANCE...
Страница 187: ...40672201TH Rev 4 CHAPTER 7 TROUBLESHOOTING AND REPAIR FOR OKIOFFICE84 OKIFAX 4500...
Страница 232: ...40672201TH Rev 4 CHAPTER 8 DIPSWITCHS SETTING TABLES...
Страница 254: ...40672201TH Rev 4 Appendix A PC Board Descriptions and Operation Second Edition December 1998 Oki Data Corporation...
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Страница 435: ...40672201TH Rev 4 Appendix F PC Loading Second Edition December 1998 Oki Data Corporation...
Страница 436: ...40672201TH Rev 4 FX 051 SYSTEM SPECIFICATION PC LOADING PART Ver 00 11 Oki Data Confidential...
Страница 448: ...40672201TH Rev 4 Appendix G RMCS SYSTEM MANUAL For Model 30 Second Edition December 1998 Oki Data Corporation...
Страница 473: ...40672201TH Rev 4 H 18 Figure 2 1 IC16 Pin 77 IC16 Pin 78 IC16 Pin 79 IC16 Pin 80...
Страница 481: ...40672201TH Rev 4 Appendix I FAX2NET FUNCTION First Edition October 1999 Oki Data Corporation...