Frontend (Fv) - Philips VR120 Service Manual

Circuit diagrams and PWB layouts, Wiring diagram
7.6

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
33V
5V_STBY 5VA
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
E
NOTE: Not in TB916 NOTE: Not in TB916
RF-out RF-out
MIX MIX
1702
+ +
MOD MOD VCO VCO
AS AS
PLL_SUPPLY PLL_SUPPLY
F 15
12
4.9V 1 VIDEO VIDEO 3 SOUND SOUND A
3V 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
VR120
2722 G2 2728 F9 3704 B2 3710 C13 3716 E14 3722 H5
2723 G3 2795 D12 3705 B7 3711 C13 3717 F11 3723 H5
2724 G9 3700 H9 3706 C9 3712 C15 3718 G6 3724 H3
2725 H3 3701 B7 3707 C9 3713 D13 3719 G7 3725 H9
2726 H3 3702 B10 3708 C11 3714 D6 3720 G9 3726 H3
2727 F12 3703 B11 3709 C4 3715 D13 3721 G6 3727 H6
4 5 6
Band 1 Adj.
for BGIL only
100K
I705
3701
3.5V
39K
7702
0V
PDTC124EU
F704
5
F706
17 17
4701
BPF BPF
delete for BGIL
F707
16
3714 I734 120p
I I III III UHF UHF
100R
13 2713
PLL PLL
14
I' III' UHF' I' III' UHF'
I735
40,4MHz
C
PLL PLL
B
for BGIL only
11 2 2
33.9V
5VA
I737
I738
F702
I739
3727
0V
5K6
33V
4 5 6
7. 69
3728 H6 3734 E13 5701 D13 5707 G1 7701-A F13 7705 C10
3729 F11 4701 D6 5702 B10 5708 H4 7701-B C14 7706 H7
3730 A7 4702 G8 5703 C3 5709 D12 7701-C G11 9701 D14
3731 H11 4703 F10 5704 E7 5710 D13 7702 B6 9702 I3
3732 D15 4704 H9 5705 D5 6701 A10 7703 A11 9906 H1
3733 D15 4705 G6 5706 B12 6702 G7 7704 D15 F700 G3
7 8 9
3730
AGC-Adj.
I706
3705
680R
2709
8p2
0.7V 0.9V 3.1V 2.6V 3.5V 2.7V
22 15 4 6 7 19
14
2.4V
TUNER VIF
AGC AGC
1
1 4 3.3V
FPLL
VIF
1704
2
3.3V
AMPLIFIER
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
2.9 - 5V
4.8V
I723
I728
5VA
1706 / 1766
at the same pos.
EFC EFC
1703
3720
1 1
1
470R
4
2 2
2
5
for MONO only
GND
3
1707
EFC
4.1V
I725
3725
7706 1
BC847BW
470R
2
for BGDKMONO
or BGILMONO
for BGIL
or BGDK only
8
7 8 9
F701 F1 F707 D5 F713 I5 I703 F5 I709 C9 I717 D13
F702 G4 F708 F2 F714 A11 I704 C3 I710 C9 I718 E13
F703 C11 F709 F3 F715 I9 I705 B6 I711 C9 I719 F12
F704 B4 F710 F3 F716 I9 I706 B8 I712 C10 I720 F12
F705 D13 F711 I3 I701 C13 I707 C9 I715 C14 I721 F11
F706 D5 F712 B13 I702 F5 I708 C9 I716 C14 I722 F11
10 11 12 13
F714
5VA
5.1V
3V 7703
BC847BW
2.5V
5VA 5VA
5702
6 3
F712
2
4 1
for BGIL
s1
or BGDK only
1.8V
7 8
I701
AFC-Adj. 1.9V
7705
12.4V
2.1V 5V
2795 5710
18 17 21 20
I717
2711
VOLTAGE
REFERENCE
F705
AFC
DETECTOR
1.8V
2V
5709 3715
VCO 16
TWD
I718
VIDEO DEMODULATOR
AND AMPLIFIER
8 2.4V
7
FM-PLL DEMODULATOR
3734
150R
for mono only
12 13 9 10 11
2V 3729 2.5V 2.3V 2.3V 1.9V
5K6
for stereo only I721 I719
I722
16
4703 7701-A
Vdd
I720 HEF4053BT
11 S
I726
5VA 14 Z
7701-C 16 E
2.5V Vdd 0V
HEF4053BT
3 3 5 Y0 S 9
0.5V
3 Y1 Z 4
for MONO only
2.5V
Vss Vee E
8 7
6
for BGIL
or BGDK only
3
I727
B/G I
PSS 1 1
SB1 0
0
SFS 0 1
10 11 12 13
I723 F10 I729 I5 I736 E6
I724 G10 I730 I5 I737 G7
I725 H10 I731 B14 I738 G7
I726 F10 I733 E7 I739 H6
I727 H10 I734 D6
I728 F9 I735 E6
14 15
A
B
I731
AFC
16
7701-B
Vdd I715
HEF4053BT
0V
2 Y0 S 10
5VA
1.8V
1 Y1 Z 15
C
Vss Vee E
8 7 6
6
0.9V
VFV
1.8V
9701 7704
BC857BW
delete for BGIL
5701 or BGDK
2.5V
D
3713
1705
3 1 1.8V
2
E
AFV
F
Y0 12
Y1 13
Vee Vss
Interconnections:
6 7 8
AF page 73
G
AL page 72
AIO1 page 66
AIO2 page 65
DE page 67
FM ST page 70
H
FM NIC-page 71
L L' D/K
FV page 69
FOME page 78
0 0 1
I/O page 77
PS page 64
1 0
0
VPO page 76
I
VS page 75
1 1 1
VS_S page 74
FV-8920-10
14 15