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2.4 PAL tuner – THOMSON FE6234B
TU1
TV
AGC(int)
FM Ant-in
AS
SCL
SDA
+5V-T
+5V-T
NC
+33V
NC
NC
FM-SW
Audio o/p
SIF / AS
GND
Video
FM-IF
G1
TH1
G2
TH2
+5V-IF
G3
TH3
G4
TH4
NC
NC
T
THOMOSON
FE6234B
+9V
L21
Z200
L22
R72
+9V_TU
Z220
4.7 J
D8
A
K
(1W)
1N6478
(1A)
The Tuner feature as bellowing:
1. +5V input
2. CVBS signal output
3. base-band audio output (L/R)
4. I2C interface communicate
5. Support PAL system
PAL tuner Circuit
1
2
C45
C46
3
100P J
100P J
4
T
T
T
5
C47
6
0.1U K
C48
100P J
7
T
8
T
9
33V_TU
10
11
12
13
14
THOMOSON Tuner Video Output
15
= 0.85 ~ 1.15Vpp at 75 OHM load
16
T
17
L19
Z220
+5V_TU
18
19
C57
C58
+
C59
100P J
0.01U K
20
220U 16V
T
T
T
U3
(Io = 0.22A ,max)
1
3
VI
VO
NJM7805DL1A-TE1_PB F
C63
+
C62
0.1U K
47U 16V
SUB_SCL1_TU
R59
33
SUB_SDA1_TU
R60
33
C49
+
C50
0.01U K
220U 16V
T
T
D7
R61
10K
K
A
C51
LL4148
C52
ZD28
0.022U K
UDZS33B
T
T
+9V_TU
L20
R65
560
Z220
+
C60
10U M
sycn tip 640mV
R69
0
+5V_TU
+
C64
R75
0
47U 16V
C65
0.1U K
R77
0
R78
0
T
Connecting TU GND and Video GND
112
SCL_CONN
1,4,5
SDA_CONN
1,4,5
L17
Z220
+5V_TU
L18
1000U K
0.022U K
R62
C53
R64
C55
4700P K
10K
180P J
(X7R)
(NP0)
T
B
Q5
BC847C
C56
6800P K
(X7R)
T
T
1VP-P
R66
470
+9V_TU
R67
NC
(1/4W, fusible)
R68
NC
B
Q6
NC
B
Q7
2N3906S
R71
sycn tip 710mV
NC
Connecting TU GND and MSP GND
R73
0
R74
0
R76
0
R79
0
R80
0
R81
0
T
+5V_TU
150
R63
22
C54
1U K
T
TV_SIF
5
TV_CVBS
4
+
C61
NC
R70
NC
(1Vpp at 75 Ohm load)
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