Fm Stereo (Fm-St) - Philips VR120 Service Manual

Circuit diagrams and PWB layouts, Wiring diagram
7.7

FM stereo (FM-ST)

1
A
B
8
3770
C
SIF2
1K
attention for pos. 7760 solder direction!
D
2780
4768
2765
4764
E
1
VR120 7.
2 3 4
2.9V
14
4
FM DEMODULATOR
5
NARROW-BAND PLL
AMPL. 1
SC1
9
16
12
11
2784
25 IFINT
2.4V
47p
17
19
20
22
FM DEMODULATOR
44
NARROW-BAND PLL
AMPL. 2
SC2
36
23
18 13
2.9V
2 3 4
70
5 6
2775
10n
2778
470n
2781
470n
2.5V 2.5V 2.8V 2.7V 2.5V 2.5V
10 32 33 8 3 6 38
AF -
STEREO DECODER
STEREO ADJUST
AF SWITCH
B/G, D/K, I, M(Korea)
STANDARD
7760
TDA9873HZ
DIGITAL
DIGITAL IDENTIFICATION
ACQUISITION PILOT IIC-BUS
AF -
OSCILLATOR NARROW-BAND PLL TRANSCEIVER
CLOCK
26 24 15 31 35 34 30 29
1.4V 2.6V 2.5V 2.5V
1.4V 3V 2.7V
for German stereo only
5 6
7 8
39 40
11
3775
OUTL 1 2.5V
470R
3776
2 2.5V
OUTR
470R
OUTM 43
5VA
2782
41
VREF 2.5V
47u
AGND 7 0V 4760
POWER
SUPPLY
VCC 28
5V
I770
DGND
27
21
1.5V
MAD
37 42
2.5V
C760
GNDFMS
GNDFV
9703
GNDFMS GNDFV
..
OSCILLOGRAMS
..V MEASURED IN PLAYBACK MODE
..V MEASURED IN RECORD MODE
7 8
1760 E5
2760 E3
2763 E3
2770 D4
2772 A3
2773 A3
2775 A5
2778 A5
2779 E6
2780 E5
2781 A5
2782 C7
A
2783 E5
2784 C2
2785 D4
2786 D8
2789 A6
3762 E3
3766 E6
3768 A3
3769 E6
3770 C2
3771 E5
3775 B7
B
3776 B8
4760 C7
AFL 4761 D7
4769 C8
5763 C8
AFR
7760 C5
9602 E2
9703 E3
C760 E2
I770 C8
I791 E3
I792 E3
C
I793 A3
Interconnections:
AF page 73
AL page 72
AIO1 page 66 D
AIO2 page 65
DE page 67
FM ST page 70
FM NIC-page 71
FV page 69
FOME page 78
I/O page 77
PS page 64
E
VPO page 76
VS page 75
VS_S page 74
FM-ST-8920-8