Philips L01.1U Service Manual page 94

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EN 94 9. L01.1U AC
EXT. AUDIO
INPUT
RF ANT.
FM ANT.
1000
0265
TUNER
1 1
1
EXT. VIDEO
INPUT
POWER
SUPPLY
9.2.2 Mono
In mono sets, the signal goes via the SAW filter (position 1002/
1003), to the audio demodulator part of the UOC IC 7200. The
audio output on pin 48 goes to the audio amplifier (AN7523 at
position 7902).
EXT. AUDIO
OUTPUT
EXT. AUDIO
INPUT
RF ANT.
FM ANT.
1000
0265
TUNER
1 1
1
Circuit Description
AUDIO SOURCE SELECTION
7801
7209
7210
FM IF
BUFFER
NOT FOR
NAFTA
7200
10
11 18
SAW
19
FILTER
AGC
1200 : 1202
38
SOUND
TRAP
INT_CVBS 40
EXT_CVBS
42
7802
VIDEO
SWITCH
VIDEO SOURCE
SELECTION
V BAT
AUDIO
12V
3.9V
3.3V
Figure 9-3 Stereo audio signal processing
FM PRE
AMP .
NOT FOR
NAFTA
7200
SOUND
DEMOD.
10
18
19
VISION
11
SAW
FILTER
DEMOD.
AGC
Figure 9-4 Mono audio signal processing
7861
7831
CONTROL
AUDIO DECODING
AND
PROCESSING
SELECTION
MATR. SWITCH
7834
7835
SOUND
IF
DEMOD.
VISION
µP
IF
DEMOD.
I2C
VIDEO
PROCESSING
SYNC
PROCESSING
16 17 15 30
The volume level is controlled at this IC (pin 9) by a
'VolumeMute' control line from the microprocessor.
The audio signal from IC 7902 is then send to the speaker and
headphone output panel.
AUDIO SWITCH
IF
µP
IF
Published in Heiloo Holland
EXT. AUDIO OUT
7901
AUDIO
AMPL.
7602
68
NVM
50:53
EXT RGB/YUV INPUT
7330
RGB/YUV 56:58
VIDEO
PROCESSING
AMPL.
EHT
7460
H
HOR.
DEFL.
+
EW
EW
7471
V+
VERT.
DEFL.
V-
CL 16532016_01a.eps
7902
SMART
SND
AVL
7602
68
NVM
CL 16532016_01b.eps
22/11/2016
120401
AUDIO
AMPL.
120401