Philips L01.2A AB Service Manual page 48

EN 48 9. L01.2A AB
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 1004
in case of QSS demodulation and 1003 in case of Intercarrier
demodulation), to the audio demodulator part of the UOC
IC7200. The mono audio output on pin 48 goes directly, via the
EXT. AUDIO
OUTPUT
EXT. AUDIO
INPUT
RF ANT.
FM ANT.
1000
0265
TUNER
1 1
Circuit Descriptions, Abbreviation List, and IC Data Sheets
AUDIO SOURCE SELECTION
7801
7209
7210
FM FM IF FMR
BUFFER
7200
SIF SOUND
23
SAW
FILTER 24
DEMOD.
10
VIF
VISION
11 18
SAW
19
FILTER
DEMOD.
22
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
FM IF
FM FMR
BUFFER
7200
SIF
23
SAW
FILTER 24
VIF
10
18
19
11
SAW
FILTER
1
AGC
22
7861
7831
CONTROL
AUDIO DECODING
AND
PROCESSING
SELECTION
47
MATR. SWITCH
7834
7835
33
IF
µP
IF
I2C
VIDEO
PROCESSING
SYNC
PROCESSING
16 17 15 30
Figure 9-3
smart sound circuit (7941 for Bass and 7942 for Treble) and
buffer (7943), to the audio amplifier (AN7523 at position 7902).
The volume level is controlled at this IC (pin 9) by a
'VolumeMute' control line from the microprocessor.
The audio signal is then sent to the speaker/headphone output
panel.
AUDIO SWITCH
SOUND
IF
DEMOD.
VISION
µP
IF
DEMOD.
Figure 9-4
EXT. AUDIO OUT
7901
24
AUDIO
AMPL.
25
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 16532008_039.eps
7941
7942
7943
SMART
SND
48 VOLUME MUTE
AVL
7602
68
CL 16532008_040.eps
220501
7902
AUDIO
AMPL.
9
NVM
220501