10
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 IC1201, reverse-amplified by Q2501 and Q2502. Then by
putting Q1310 and Q1311 'ON', it mutes audio signals.
In addition, if IC1501 detects no-signal, it generate a mute signal called ZERO MUTE. This latter is
reverse-amplified by Q1501 and mutes useless audio signals by putting Q1310 and Q1311 'ON'.
4.
5.1CH Difference List
Output
D/A Converter
Operational amplifier
Front L/R
IC 1503
IC 1508, IC 1510, IC 1517
Surround L
IC 1502
IC 1511, IC 1512
Surround R
IC 1501
IC 1511, IC 1512
Center
IC 1501
IC 1513, IC 1514
SUBW
IC 1502
IC 1513, IC 1514, IC 15188
+
-
3
2
1
+
Filter 2
Filter 1
Filter 3
IC1508
C1567
R1533
C1571
C1561
R1531
C1563
R1529
C1559
R1527
Summary of Contents for DV-P505E
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