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Hitachi VTMX900ECT Wartungshandbuch Seite 104

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3-22
FM Stereo (FM-ST)
1
2
A
B
8
3770
2784
C
SIF2
1K
47p
D
C760
E
..
OSCILLOGRAMS
GNDFMS
..V MEASURED IN PLAYBACK MODE
..V MEASURED IN RECORD MODE
GNDFMS
1
2
REC
08
0V
A: DC, 500mV/Div, 2us/Div
A: DC, 2 V/Div, 500us/Div
IC 7705 PIN12 SIF2
IC 7761 PIN30,31 AFL,AFR
Interconnections:
AF page 3-27
AL page 3-24
AIO1 page 3-17 AIO2 page 3-15 DE page 3-19
FV page 3-21
FOME page 3-34 I/O page 3-33
PS page 3-14
3
4
5
2778
470n
2781
470n
2.9V
2.5V
2.5V
2.8V
14
10
32
33
4
FM DEMODULATOR
5
AF -
NARROW-BAND PLL
AMPL. 1
SC1
9
16
12
11
IFINT
2.4V
25
17
19
20
22
DIGITAL
FM DEMODULATOR
ACQUISITION
44
AF -
NARROW-BAND PLL
OSCILLATOR
NARROW-BAND PLL
AMPL. 2
SC2
CLOCK
36
23
18
13
26
24
15
2.9V
1.4V
2.6V
1.4V
GNDFV
9703
GNDFV
3
4
5
REC
11
0V
FM ST page 3-22 FM NIC-page 3-23
VPO page 3-32
VS page 3-31
VS_S page 3-28
3-22
6
7
2775
10n
2.7V
2.5V
2.5V
8
3
6
38
39
40
3775
OUTL 1
2.5V
470R
STEREO DECODER
3776
OUTR 2
2.5V
STEREO ADJUST
AF SWITCH
B/G, D/K, I, M(Korea)
470R
STANDARD
OUTM 43
2782
VREF 41
2.5V
7760
47u
AGND 7
0V
4760
POWER
SUPPLY
TDA9873HZ
VCC 28
5V
DGND
DIGITAL
27
IDENTIFICATION
PILOT
IIC-BUS
TRANSCEIVER
21
1.5V
MAD
31
35
34
30
29
37
42
2.5V
2.5V
2.5V
3V
2.7V
for German stereo only
6
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
11
B
3776 B8
4760 C7
AFL
4761 D7
4769 C8
5763 C8
AFR
7760 C5
9602 E2
5VA
9703 E3
C760 E2
I770 C8
I791 E3
I792 E3
C
I793 A3
I770
D
E
attention for pos 7760 solder direction!
8

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