Hitachi VTMX900ECT Wartungshandbuch Seite 109

FM - Audio (AF)
1 2
5VA 9VA
A
GNDAF GNDAF GNDAF
B
I666
16
GNDAF GNDVS GNDVS
0V
AH2
0V
AH1
C
AHC
2654
17 3658
470R I659
10n
GNDVS
11
I656
F668 2657
AFL
D F667 2658
220n I655
AFR
I661 I657
2659
220n
AINFL
I660
2661
220n I664
AINFR
I654
2662
220n
AIN1L
2664
220n I653
AIN1R
I652
2665
220n
AIN2L
2666 I651
220n
AIN2R
E
220n
12
C652 C651 C650
GND GNDVS GNDAF GNDAIO
F663
F
AMLR
AMLP
1 2
3 4
F670
F669
GNDAF
9.1V 7.8V 3.8V
27 34 29 28 41 0.8V
1.2V 40 GND VCC Vref Iref DCL
VCCH
DCR
active standby
passive standby
39
+ level
LPF
HID
35 detect
4.3V
HF
BPF
PLL
4.3V 37
1,7/1,8 limiter
HFAGC
1.3Mhz
pb amp
0V 1.4Mhz
RM
rec curr HF
4.2V CCO
LPF
level
36
M +
detect
38 BPF
4.2V
CCO
HF
head amplifier 1,7/1,8
1.7Mhz
limiter
1.8Mhz
3.8V 1 SAP
HF
PLL
LPF
3.8V 2 TUL
DUB
Volume L FM (de-)modulator
3.8V N
3 TUR
3.8V 4 CIL
M
3.8V 5 CIR
+ +
3.8V 6 E1L
M
3.8V 7 E1R
Volume R
3.8V E2L
8
9 E2R
3.8V
10
3.8V AUXL SAP
M
11 TUL
3.8V AUXR
+
Normal Sel
TUR
E2L
Input Sel
+
E2R
4.6V
18
2670
220n
3 4
3-27 3-27
5 6 7
I658
9010
GNDAF
44 2V 0.5V 4.0V 42 43
4.0V
7650
EOS+Pb
TDA9605H
HiFi DET 2
I C
DOC
audio LPF
noise
Noise
M
suppr.
Reduction
audio
clipper
audio LPF
Noise
noise
Reduction
M
suppr.
audio
clipper
L
Line Sel
+
E2L
+
R
+
NILevel N
N M
E2R
i/o control
Dec.Sel
Out Sel
M
EOS+REC
TUL
E1L
DUB
M
SAP
DCL
TUR
DCR
E1R
M
SAP
MUTE
Auto-mute
M
RFC Mute
21 22
3.8V
6651
BAS216
GNDAF GNDAF
I665
19
GNDAF
5 6 7
Interconnections:
AF page 3-27 AL page 3-24
FV page 3-21 FOME page 3-34 I/O page 3-33
8 9
5VA 9VA
.. OSCILLOGRAMS
..V MEASURED IN PLAYBACK MODE
..V MEASURED IN RECORD MODE
5VA 9VA
2679
F652
GNDAF
10u
23
3.6V
I662
F651 3655 2680
24
3.9V
GNDAF
F664
2K7 2681 6n8
25 3.9V
GNDAF
F650 2650
26 0.8V 0.7V 47u
GNDAF
F656
2651
33 3.8V 10u
3.9V
GNDAF
F655
32 3.8V 10u
3.9V
2653
3657
31 3.9V
GNDAF
I663
0.7V 2K7
30 6n8
F653
2655
GNDAF
F654 2656
47u
GNDAF
10u
+1dB 12V
13
4.6V 2660
F657
AOUT1L
16
15 2u2
2663
4.6V AOUT1R
17
F660
18 2u2
4.6V
14
F658 2667
AOUT2L
19
2u2
4.6V
F659 2668
AOUT2R
20
2u2
3.9V 15
F661 2669
13
100n
14
12
GNDAIO GNDAIO
GNDAF
8 9
AIO1 page 3-17 AIO2 page 3-15 DE page 3-19 FM ST page 3-22 FM NIC-page 3-23
PS page 3-14 VPO page 3-32 VS page 3-31
1501 A1 F672 B5
2650 C9 F673 A1
2651 C9 F674 B1
2652 C2 I651 E2
2653 C9 I652 E2
2654 C1 I653 E2
2655 D9 I654 D2
2656 D9 I655 D2
2657 D2 I656 D2
2658 D1 I657 D2
A
2659 D2 I658 A5
2660 D9 I659 D2
2661 D1 I660 D1
2662 D2 I661 D1
2663 D8 I662 C9
2664 E1 I663 C9
2665 E2 I664 D2
2666 E1 I665 F5
2667 E9 I666 B2
2668 E8 I667 A4
2669 E8 I669 B6
B 2670 F4 I670 B6
2671 F7
2672 A4
2673 A2
2674 A2
2675 B1
2676 B2
2677 A4
2678 A5
2679 B9
2680 C9
2681 C9
C
2682 C2
3650 A4
3651 A6
3652 A6
3653 A5
3654 B8
3655 C9
3656 C8
3657 C9
3658 C2
3659 F7
3660 F9
D
3661 F9
5650 A2
5651 B1
6651 F6
7650 B3
9010 A5
C650 E2
C651 E1
C652 E1
F650 C8
F651 C8
E F652 B8
F653 C8
F654 D8
F655 C8
F656 C8
F657 D8
AMCO F658 E8
F659 E8
F660 D8
F661 E8
F662 F7
F663 F2
F
F664 C8
F665 A5
F666 A4
F667 D1
F668 D1
F669 A3
F670 A3
F671 A4
VS_S page 3-28