DP-3X AUDIO VIDEO MUTE CIRCUIT EXPLANATION
PAGE 02-07
FRONT AUDIO OUT HARD MUTE PATH:
•
The high from
Q527
is routed to
DA06
the through the
PPS4
connector pin
4
. The high continues to the
base of
QAA2
.
When this transistor turns on, it supplies a Lo to pin
11
of
IAA1
and hard mutes the Au-
dio Out. (Note: This is not the same thing as the Mute selected from the customer’s remote. This is con-
trolled by the Front Audio Control IC
IA01
internally and functions in three states, No Mute = 100%,
1/2 Mute = 50% and Full Mute = 0%.
OUT TO HI-FI MUTE PATH:
The high from the
Mute Activation
circuit is also routed to the anode of
DA54
and then to the cathodes of
DA51
and
DA52
to the base of
QA51,
and
QA54
.
When these transistor turns on,
they grounds the Right and Left audio for the Out to Hi-Fi audio output jacks.
FRONT AUDIO OUT MUTE: Labeled as V MUTE 1 (Microprocessor Pin 49)
V MUTE 1:
The high from the Microprocessor pin
49
to
I010
(in pin
3
at 3.3V and out pin
17
at 5V). This
High is sent to the following 4 circuits:
1.
To the Front Audio Out Hard Mute circuit routed through
DA06
. (
Described above
)
2.
The high is also routed through
DA03
to the base of
QA01,
and
QA02
.
When these transistor turns on,
they ground the audio going into the Audio Output IC
IAA1
at the
PPS4
connector. Right audio in pin
2
of the
PPS4
connector to pin
4
of
IAA1
. Left audio in pin
3
of the
PPS4
connector to pin
2
of
IAA1
.
3.
CRT Mute:
See CRT Mute Path explanation above.
4.
Out to Hi-Fi Mute Path:
The high from the Level shifter
I007
pin
13
is routed to the anode of
DA53
and then to the cathodes of
DA51
and
DA52
to the base of
QA51,
and
QA54
.
When these transistor
turns on, they ground the audio going into the audio for Out to Hi-Fi audio output jacks.
A MUTE PATH: (Microprocessor Pin 71)
A MUTE:
Also, the high from the Microprocessor pin
71
to
I007
(in pin
7
at 3.3V and out pin
13
at 5V).
This High is sent to the following 3 circuits:
1.
Front Audio signal mute:
The high from the Level shifter
I007
pin
13
is routed to the anode of
DA04
and to the base of
QA01,
and
QA02
.
When these transistor turns on, they ground the audio going into
the Audio Output IC
IAA1
at the
PPS4
connector. Right audio in pin
2
of the
PPS4
connector to pin
4
of
IAA1
. Left audio in pin
3
of the
PPS4
connector to pin
2
of
IAA1
.
2.
Main Tuner U301 Mute:
The high from the Level shifter
I007
pin
13
is routed to pin
25
of the Main
Tuner
U301
. This high mutes the Audio and Video outputs from the Tuner.
3.
Out to Hi-Fi Mute Path:
The high from the Level shifter
I007
pin
13
is routed to the anode of
DA53
and then to the cathodes of
DA51
and
DA52
to the base of
QA51,
and
QA54
.
When these transistor
turns on, they ground the audio going into the audio for Out to Hi-Fi audio output jacks.
REC MUTE PATH: (Microprocessor Pin 70)
Record Mute signal path
.
This pin is only used in the DP-36 chassis. It is routed through
D405
to pin
38
of the
PST1
connector on the Terminal PWB. Here it is routed to
DV02
and
DV03
and then to the bases of
QV08
and
QV09
. When this line goes high, the Audio Left and Right is muted coming from the monitor outputs. The DP-
36 utilizes a Digital Tuner (ATSC). The ATSC tuner also outputs NTSC video and Audio which is routed to the
Monitor outputs for VCR recordings. When the ATSC tuner (Antenna C) changes channels, the audio is muted
briefly to avoid the unnecessary noise during switching.
Note too that the DP-36 does not utilize D406 like all the other chassis.
FRONT SPEAKER OFF: (IA01 Pin 17)
Front Speaker Off signal
.
The high from the Audio Control IC
IA01
pin
17
goes to 2 circuits:
1.
It goes to
DA07
to the
PPS4
connector pin
4
. The high continues to the base of
QAA2
.
When this tran-
sistor turns on, it supplies a Lo to pin
11
of
IAA1
and hard mutes the Audio Out.
2.
It goes through
DA05
to the base of
QA01,
and
QA02
.
When these transistor turns on, they ground the
audio going into the Audio Output IC
IAA1
at the
PPS4
connector. Right audio in pin
2
of the
PPS4
connector to pin
4
of
IAA1
. Left audio in pin
3
of the
PPS4
connector to pin
2
of
IAA1
.
Summary of Contents for 46W500
Page 2: ...DP 3X BLANK PAGE NOTES BLANK PAGE ...
Page 6: ...DP 3X BLANK PAGE NOTES BLANK PAGE ...
Page 7: ...DP 3X CHASSIS INFORMATION POWER SUPPLY INFORMATION SECTION 1 ...
Page 8: ...DP 3X BLANK PAGE NOTES BLANK PAGE ...
Page 23: ...DP 3X CHASSIS INFORMATION MICROPROCESSOR INFORMATION SECTION 2 ...
Page 24: ...DP 3X BLANK PAGE NOTES BLANK PAGE ...
Page 35: ...DP 3X CHASSIS INFORMATION VIDEO INFORMATION SECTION 3 ...
Page 36: ...DP 3X BLANK PAGE NOTES BLANK PAGE ...
Page 50: ...DP 3X BLANK PAGE NOTES BLANK PAGE ...
Page 51: ...DP 3X CHASSIS INFORMATION AUDIO INFORMATION SECTION 4 ...
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Page 57: ...DP 3X CHASSIS INFORMATION DEFLECTION INFORMATION SECTION 5 ...
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Page 69: ...DP 3X CHASSIS INFORMATION DIGITAL CONVERGENCE INFORMATION SECTION 6 ...
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Page 83: ...DP 3X CHASSIS INFORMATION ADJUSTMENT INFORMATION SECTION 7 ...
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Page 99: ...DP 3X CHASSIS INFORMATION MISCELLANEOUS INFORMATION SECTION 8 ...
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Page 111: ...DP 3X CHASSIS INFORMATION DP 33W 46W500 DVD PLAYER TROUBLESHOOTING SECTION 9 ...
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Page 131: ...DP 3X CHASSIS INFORMATION THINGS YOU SHOULD KNOW SECTION 10 ...
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