Hitachi VTMX900ECT Wartungshandbuch Seite 103

Frontend (FV)
1701 D1 1707 G10 2704 C8 2710 C14 2716 G4
1702 E1 1708 C1 2705 C12 2711 D13 2717 G4
1703 G7 2700 D5 2706 C12 2712 G6 2718 G11
1704 E7 2701 B10 2707 C9 2713 E7 2719 G12
1705 D13 2702 C11 2708 C9 2714 E6 2720 G1
1706 G10 2703 C3 2709 C10 2715 F9 2721 G2
1 2 3
5V_STBY 5VA 33V
A
5V_STBY 5VA 33V
B
1708
1
3704
33K
GNDVIO GNDFV
C
6 4.9V 2.4V
18 18 19 19 5
MT1 MT1 MT2 MT2 +B AGC AGC I I III III
1701
VCO VCO
I I III III
I' I'
BPF BPF AGC AGC MIX MIX
D
BPF BPF AGC AGC MIX MIX
III' III'
RF-in RF-in
BPF BPF AGC AGC MIX MIX
UHF' UHF'
passive passive
UHF UHF
loop through loop through VCO VCO
UHF UHF
NOTE: Optional NOTE: Optional NOTE: UHF only for TP944 NOTE: UHF only for TP944
I' III' UHF' I' III' UHF'
E
NOTE: Not in TB916 NOTE: Not in TB916
RF-out RF-out
MIX MIX
1702
+ +
MOD MOD VCO VCO
AS AS VIDEO SOUND
PLL_SUPPLY PLL_SUPPLY
F
15 12 11
4.9V 1 3V 3 A
4.1V
G
5V_STBY
F700
9 10
9906
GNDFV GNDVIO
H
..
I OSCILLOGRAMS
..V MEASURED IN PLAYBACK MODE
..V MEASURED IN RECORD MODE
1 2 3
2722 G2 2728 F9 3704 B2 3710 C13 3716 E14 3722 H5 3728 H6
2723 G3 2795 D12 3705 B7 3711 C13 3717 F11 3723 H5 3729 F11
2724 G9 3700 H9 3706 C9 3712 C15 3718 G6 3724 H3 3730 A7
2725 H3 3701 B7 3707 C9 3713 D13 3719 G7 3725 H9 3731 H11
2726 H3 3702 B10 3708 C11 3714 D6 3720 G9 3726 H3 3732 D15
2727 F12 3703 B11 3709 C4 3715 D13 3721 G6 3727 H6 3733 D15
4 5 6 7
Band 1 Adj.
3730
for BGIL only
100K
I705
3701
3.5V
39K
0V 7702
PDTC124EU
F704
3705
680R
5
F706
17 17
4701
BPF BPF
delete for BGIL
F707
16
3714 I734 120p
I I III III UHF UHF
100R 2713
13
PLL PLL
14
I735
40,4MHz
C
PLL PLL
B
for BGIL only
2 2
33.9V
5VA 5VA
I737
I738
F702
4.1V
I739
3727
7706
0V
BC847BW
5K6
33V
4 5 6 7
3-21 3-21
3734 E13 5701 D13 5707 G1 7701-A F13 7705 C10 F701 F1
4701 D6 5702 B10 5708 H4 7701-B C14 7706 H7 F702 G4
4702 G8 5703 C3 5709 D12 7701-C G11 9701 D14 F703 C11
4703 F10 5704 E7 5710 D13 7702 B6 9702 I3 F704 B4
4704 H9 6701 A10 F705 D13
5705 D5 7703 A11 9906 H1
4705 G6 5706 B12 6702 G7 7704 D15 F700 G3 F706 D5
8 9 10
3V
5702
AGC-Adj.
6
I706
2709
4
8p2
7
AFC-Adj.
7705
0.7V 0.9V 3.1V 2.6V 3.5V 2.7V 2.1V
22 15 4 6 7 19 18
14
2.4V
TUNER VIF
AGC AGC
1 4 1
3.3V VCO
FPLL
VIF
1704 TWD
2
3.3V AMPLIFIER VIDEO DEMODULATOR
2 5
23
3.2V
QSS MIXER
I733
SIF
3 INTERCARRIER MIXER
3.2V 24
AMPLIFIER
AM DEMODULATOR
SIF INTERCARRIER
AGC MODE SWITCH
5 3 12
2.9 - 5V
4.8V
2V 3729
I723
I728
for stereo only
4703
I726
1706
EFC
7701-C
1703
I724 HEF4053BT
3720
1 3 5 Y0
1
2.5V
470R
4
3 Y1
2
2
0.5V
5 Vss
for MONO only 8
GND for BGIL
or BGDK only
3
1707
EFC
I725
3725
1 3
I727
470R
2
for BGDKMONO
or BGILMONO
for BGIL
or BGDK only
8
8 9 10
Interconnections:
AF page 3-27 AL page 3-24
FV page 3-21 FOME page 3-34 I/O page 3-33
F707 D5 F713 I5 I703 F5 I709 C9 I717 D13 I723 F10
F708 F2 F714 A11 I704 C3 I710 C9 I718 E13 I724 G10
F709 F3 F715 I9 I705 B6 I711 C9 I719 F12 I725 H10
F710 F3 F716 I9 I706 B8 I712 C10 I720 F12 I726 F10
F711 I3 I701 C13 I715 C14 I721 F11 I727 H10
I707 C9
F712 B13 I702 F5 I708 C9 I716 C14 I722 F11 I728 F9
11 12 13
F714
5VA
5.1V
7703
BC847BW
2.5V
5VA 5VA
3
F712 I731
2
1
7701-B 16
for BGIL
s1 or BGDK only Vdd
HEF4053BT
1.8V 2 Y0
8
I701
1 Y1
1.9V
Vss Vee E
8 7 6
12.4V
5V
2795 5710
17 21 20
I717 delete for BGIL
2711 5701
or BGDK
VOLTAGE
15u
REFERENCE
3713
F705
AFC
DETECTOR
1705
1.8V
2V
5709 3715
16 3 1
1.8V
I718
AND AMPLIFIER 2
8 2.4V
7
FM-PLL DEMODULATOR
3734
150R
for mono only
13 9 10 11
2.5V 2.3V 2.3V 1.9V
5K6
I721 I719
I722
16
7701-A
Vdd
HEF4053BT
I720
11 S Y0 12
5VA 14 Z Y1 13
16
E Vee Vss
6 7 8
Vdd
S 9
0V
Z 4
for MONO only
2.5V
Vee E
7 6
B/G
PSS 1
SB1 0
SFS 0
11 12 13
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
I729 I5 I736 E6
I730 I5 I737 G7
I731 B14 I738 G7
I733 E7 I739 H6
I734 D6
I735 E6
14 15
A
B
AFC
I715
0V
10
S
5VA
1.8V
Z 15 C
6
0.9V
VFV
1.8V
9701 7704
BC857BW
2.5V
D
E
AFV
F
G
H
I L L' D/K
1 0 0 1
1 0
0 0
I
1 1 1 1
14 15
VS_S page 3-28