Grundig GV400 Servicehandbuch Seite 46

www.freeservicemanuals.info
Chassisplatte – Empfangseinheit / Family Board – Frontend (FV)
1 2 3
+12A
A
2703
IN CASE OF REPLACEMENT SEE FRONTEND ADJUSTMENTS
6
I
+12V
B
I III
C
U
I U I I I
D
U
7 10 8
E
+12A
12V
+12A +12A
0V
7709
BC848B
F
12V
0V
3737
7710
47k
BC858B
11.3V +12A
12V
+12A
11.9V
12V
7708
BC848B
G
3735
7711
47k
BC858B
11.9V
0V
H
I
2 3 4 5
J
1
1701
K
1 2 3
GRUNDIG Service-Technik
Platinenabbildungen und Schaltpläne / Layout of PCBs and Circuit Diagrams
4 5 6 7
SYSTEM TUNER OFW
1720 1721
PAL BG UV917 G1966M
PAL I UV943 J1952
PAL BG UV917 K2950M
III UV917
SEC DK
G
1720
26
M
2
OFW
17
1721
1
M
16
MT2 7712
G
MT1
3720
5
47k
+33V
11 15 14 13 12
30.6V
7714
7713
BC847B
3743
BC857B
4k7
3739 1.8V
22k
HEF4104BP
8
14
VSS
12V
O3
13
7 10
O7
11 9
9
O5 STR
13 1
1.1V
10
O6
12
D
7
2
O4
14
6
O0
4 CP
3
O1
2
5
HEF4094BP
7701
O2
12V
6
3
E0 VDD
+12A +12A
15 16
1
12V 12V
3704 3705
2701
18k 22k
100n
2%
3706
6 7
68k
2%
8
4 5 6 7
8 9 10
5VAS
TRAP BANDPASS
1722 1723
TPS5.5MB-TF21F SFSH5.5MDB
TPS6.0MB-TF21F SFSH6,0MDB
TPS6.5MB-TF21F SFSH6,5MDB
5.1V 2.6V
20 6
18
3 INTERNAL TRAVELING
REFERANCE WAVE
VOLTAGE DIVIDER
4
3-stage
IF-amplifier
1
FREQUENCY
5
3.4V DETECTOR
AND PHASE
3.4V
DETECTOR
+12A
2
without_need
PLL
1.2V
3723 4
6.2V TUNER IF
AGC AGC
12
3 19
2.9V
1.2V
AGC
0.5V
2.9V
5
0.5V
7
LM358M 6
2.3V
7700
1%
3700
10k
2%
5VAS
7704
8
5.1V
15
5.2V
12
0.5V 3746
1k2
11
3747
1k2
5
5.2V
4
16
+12A
7700
LM358M
8
2
3707
1
2k2
3
1%
0.6V
4
0.6V
AGC SDA
STROBE
to DE
3708
560k
1%
1%
8 9 10
4 - 11 GRUNDIG Service-Technik
Platinenabbildungen und Schaltpläne / Layout of PCBs and Circuit Diagrams
11 12 13 14
4 3
2
6 1
2.6V
2.7V 2.7V
17 16 15
8p2
1.9V
9
VCO AFC AF
1.6V
AMPLIFIER
7702
10
TDA9800
VIDEO
VIDEO
FM-PLL
DEMODULATOR AMPLIFIER
7 2.3V
3732
AGC BUFFER AND
NOISE 2k2
DETECTOR
CLIPPING
5 8 14 13 11
3.1V 2V
2V
2.6V
1722
1 3
2
1723
3730 3731
1 3
5722
330E 560E
15u
2
1724
3740
1 3 +33V
470E
2
5VAS
+12A
12V
6702
2750
1N4148
3756
4u7
22k
1%
3757
5.3V
7707
470E
BC848B
3 7.4V
7703
1
TL 431
2
1%
PWM AFC
SCL
..V MEASURED IN PLAYBACK MODE
..V MEASURED IN RECORD MODE
..O OSCILLOGRAMS
11 12 13 14
It`s Free
15 16
1701 K 2
1720 B 4
1721 C 7
1722 E12
1723 E13
1724 F13
A
2700 J 6
2701 I 7
2702 J 7
2703 A 2
2704 I 5
2705 I 8
2720 C 8
2721 C 8
2722 A10
2723 A10
2724 D 7
2725 E11
B
2726 E11
2727 A11
AFV
AFV 2728 B15
2729 C14
to VS/IO 2730 K 4
27
2732 H12
2733 E 5
2750 H14
2760 F 4
3700 F 8
C
3701 K 9
28 3704 I 5
3705 I 6
3706 J 7
3707 J 9
1.9V
3708 K 9
1.8V 3720 D 7
1.4V
3721 D 7
VFV
1.1V 3722 D 7
D 3723 D 8
7705
to VS/IO
BC858B 3724 E 9
3725 A11
3728 A14
3729 B14
3730 E12
3731 E13
3732 D14
3733 E15
3735 G 2
3736 G 1
E
3737 F 2
3738 F 1
3739 F 4
3740 F13
3741 F 8
3742 F 7
3743 E 7
3744 E 6
3745 E 4
3746 G10
F
3747 H10
3750 H12
3751 I12
+33V
3752 H13
3753 I14
3754 H15
3755 G15
3756 H14
3757 H13
5VAS
G 3760 J 6
5703 A12
7706
3755 5720 C 6
BD436
5721 A 9
10E +14A
5722 E12
14.5V 6702 H14
7700 I 8
3754
14.8V
7700 F 8
330E
7701 H 4
7702 C12
13V 7703 I14
H
7704 F 8
13.36
7705 D15
7706 G15
7707 H14
7708 G 2
7709 F 3
7710 F 1
7711 G 1
7712 D 7
I 7713 E 6
7714 E 7
J
Frontend 9314
K
A.N. 9318
15 16
4 - 11