Hitachi VTMX900EUK Service Manual page 104

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