Haier HT-2180 Service Manual page 28

N201
Pin Function
1 Unweighted
2 Audio signal output
3 PIF circuit power supply
4 AFT output and auto-adjusting
5 PIF circuit grounding
6 IF signal input pin
7 IF signal input pin
8 RF AGC output
9 IF AGC filtering
10 Color demodulation APC filtering
11 4.43MHz crystal oscillator
12 Y/C circuit grounding
13 Analog RGB and AKB mode
alternating
14 Analog R signal input
15 Analog G signal input
16 Analog B signal input
17 RGB(image and
circuit) power supply
18 R signal output
19 G signal output
20 B signal output
21 ABCL control pin
22 Field sawtooth wave forming
23 Field feedback signal
24 Field driving signal output
25 Field AGC
26 Bus clock signal
27 Bus data signal
28 Deflection circuit power supply
29 PAL/NTSC identification signal
output
SECAM identification signal input
30 Line feedback pulse input
31 Composite synchronizing pulse
signal output
32 Line driving signal
33 Deflection circuit grounding pin
34 Sandcastle pulse input
35 Video switching signal output
36 Digital circuit power supply
37 SECAM B-Y signal input
38 SECAM R-Y signal input
39 Y signal input
Reference Voltage(V)
Without With signal
signal
5.0
3.5
9.0
2.1
0
2.0
2.0
6.6
5.2
2.4
3.5
0
0
2.7
2.7
2.7
message 9.0
3.0
3.0
3.0
5.6
4.1
5.0
0.9
1.8
5.0
5.0
9.0
1.5
0.6
4.5
2.7
0
1.5
3.1
5.0
2.4
2.4
3.1
27
Circuit Explanation
TB1238AN
Reference Resistance(KΩ )
Forward(Ω)
5.0 800
3.5 750
9.0 460
2.1 750
0 0
2.0 680
2.0 680
4.0 680
4.1 760
2.4 750
3.5 820
0 0
0 720
2.7 800
2.7 800
2.7 800
9.0 450
3.0 760
3.0 760
3.0 720
5.6 820
4.1 750
5.0 820
0.9 720
1.8 800
5.0 720
5.0 720
9.0 450
1.5 800
0.6 780
4.5 780
2.7 640
0 0
1.5 820
3.1 750
5.0 470
2.4 800
2.4 800
3.1 800
Backward(Ω)
2000
2000
600
600
0
2000
2000
2000
2000
3000
3000
0
650
3000
3000
3000
600
1500
1500
1400
2000
2000
2000
900
2000
15000
15000
600
2000
2000
2000
680
0
2000
1200
800
2000
2000
3600