Hitachi VTMX900ECT Wartungshandbuch Seite 105

FM Stereo Nicam (FM-ST-NIC)
1 2
5VA 5VD 9VASW
A
5VA 5VD 9VASW
I760
3765
12
B
SCL
100R
I761
3767
13
SDA
100R
I762
2771
1.5V 3
GNDFMS
47p
8
2792 I763
2 ANA_IN1+
1.5V
SIF2
C
47p
MONO
7
I764
2774
3.8V 43 MONO-IN
AFV
D
41 SC1-IN-R
GNDFMS
3.8V
SCART 1
I766
40 SC1-IN-L
3V
38 SC2-IN-R
37 SC2-IN-L
SCART 2
E
F
GNDFMS
1 2
REC 07
0V
A: DC, 1 V/Div, 500us/Div A: DC, 500mV/Div, 2us/Div
IC 7705 PIN8 AFV MONO IC 7705 PIN12 SIF2
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
GNDFMS
2761
GNDFMS
100n
GNDFMS
2764
GNDFMS
2766
GNDFMS
I790
5.2V
7 8 9 4
10
TP TP TP TP
7761
MSP3415D
I2SL/R
I2SL/R
S1...4
FM1
LOUDSPEAKER R
FM2
DEMODULATOR
NICAM A
LOUDSPEAKER L
NICAM B
IDENT IDENT
DSP
HEADPHONE R
A/D SCART-L
HEADPHONE L
SCART-R
A/D
SCART-R
SCART-L
SCART
Switching Facilities
NC NC NC NC
25 29 35 39 44 17 21 28 20 5.1V 1 5 2.4V
1761
I774 I775
F761 5762
GNDFMS
HC-49/U
10u
18M432
GNDFMS GNDFMS GNDFMS GNDFMS
5VA
3 4 5
REC 08 REC
0V
A: DC, 2 V/Div, 500us/Div
IC 7761 PIN30,31 AFL,AFR
FM ST page 3-22 FM NIC-page 3-23
VPO page 3-32 VS page 3-31 VS_S page 3-28
3-23 3-23
6 7 8
5VD
6760
3760
9VASW
1N4148
10n
10u
2.6V 8V
I789
42 33 32 34
11
5.16V
I786
19
5.1V
I785
22 5.1V
DACM-R 26
D/A GNDFMS GNDFMS
LOUDSPEAKER
DACM-L 27
D/A
I784
18
TP
I783
36
3.7V
I782
23
24
GNDFMS
SC1-OUT-R 30 4767
3.8V
D/A
SCART 1
SC1-OUT-L 31 3.8V 4768
D/A
TP TP TP
GNDFMS
6 6.2V 14 15 16
I776
GNDFMS
6 7 8
11
0V
9 1761 E6
2761 A6
2764 A6
2765 D8
2766 A6
2767 B8
2768 B8
2769 B7
2771 C2
A 2774 D2
2776 D7
2777 D2
2787 F5
2788 F6
2790 F5
2791 F5
2792 C2
2793 E7
2794 E8
3760 A6
3763 A7
B
3764 A8
3765 B2
3767 B2
4759 A5
4762 F3
4763 F3
4764 F3
4765 F4
4767 D8
4768 E8
5760 A8
5761 F5
C
5762 E5
6760 A6
6761 A7
7761 B3
9724 A8
F760 E3
F761 E5
I760 B2
I761 B2
I762 B2
I763 C2
D I764 C2
I766 D2
I768 E3
11
I772 E4
I774 E5
AFR
I775 E6
I776 E6
AFL I782 D7
I783 D7
I784 C7
I785 B7
I786 B7
E
I787 A6
I788 A6
I789 B7
I790 B5
F
.. OSCILLOGRAMS
attention for pos 7761 solder direction!
..V MEASURED IN PLAYBACK MODE
..V MEASURED IN RECORD MODE
9