14
Chapter 1
This 3-section filter constitutes a low pass filter of overall cutoff frequency of 44KHz. Audio signals after
low pass filter is amplified by IC1510 by about 6dB and output to audio out1 and audio out2.
Here, among audio signals, FL signals are input at pin 3 of IC1508 and output from pin 1, then input to pin
2 of IC1510 then output from pin 1.
FR signals are input at pin 5 of IC1508 and output from pin 7, then input to pin 6 of IC1510 then output
from pin 7.
3.
MUTE CIRCUIT (DEC substrate, RJK substrate)
The principal role of mute circuit is the erasing of useless noises occurring when power is turned on.
Mute signal for noise erasing is generated by SH MICOM, reverse-amplified by Q1505 and Q1506. Then
by putting Q1310 and Q1311 'ON', it mutes audio signals.
In addition, if IC1502 detects no-signal, it generate a mute signal called ZERO MUTE. This latter is
reverse-amplified by Q1507 and mutes useless audio signals by putting Q1310 and Q1311 'ON'.
+
-
3
2
1
+
Filter 2
Filter 1
Filter 3
IC1508
C1567
R1533
C1571
C1561
R1531
C1563
R1529
C1559
R1527
Summary of Contents for DV-P250A
Page 9: ...6 Chapter 1 Rear Panel ACER DVD 5500 ACER DVD 5300 ...
Page 10: ...Chapter 1 7 Acer DVD 5100 Hitachi DV P250E ...
Page 29: ...26 Chapter 1 ...
Page 40: ...Appendix A 37 DEC Board A side Schematics Appendix A ...
Page 41: ...Appendix A 38 DEC Board B side ...
Page 42: ...Appendix A 39 RJK Board A side ...
Page 43: ...Appendix A 40 RJK Board B side ...
Page 44: ...Appendix A 41 FSW MVR FJK Board A side ...
Page 45: ...Appendix A 42 FSW MVR FJK Board B side ...
Page 47: ...Appendix A 44 Exploded Diagram ...
Page 49: ...FSW PWB MVR PWB FJK PWB ...