Haier HT-2180 Service Manual page 31

Pin Function
23 Green primary
character output
24 Blue primary
character output
25 Character blanking
26 Line flyback
27 Field flyback
28 Character oscillating
29 Character oscillating
30 Grounding
31 CPU clock
32 CPU clock
33 CPU reset
34 Vacant pin
35 Infrared receiving input
36 Line synchronizing signal
input
37 Clock bus control
38 Data bus control
39 Vacant pin
40 Vacant pin
41 Vacant pin
42 Power supply
N101
Pin Function
1 Output (BU)
2 Output (BH)
3 Control input
4 Control input
5 Grounding terminal
6 Power input terminal 1
7 Output (BL)
8 Vacant pin
9 Power input terminal 2
Reference Voltage(V)
Without
signal
color 0
color 0
0
4.0
4.8
5.0
5.0
0
2.1
2.1
5.0
5.0
5.0
4.7
2.9
3.2
0
4.6
0
5.0
LA7910
Reference
Voltage(V)
Without signal
1.7
12.6
4.8
0
0
14.0
0
0
12
Circuit Explanation
Reference Resistance
With
Forward(Ω)
signal
0 620
0 620
0 620
4.0 680
4.8 680
5.0 600
5.0 0
0 0
2.1 700
2.1 700
5.0 650
5.0 700
5.0 700
4.7 700
2.9 700
3.2 700
0 700
4.6 700
0 700
5.0 420
Reference Resistance
Forward(KΩ) Backward(KΩ)
120
17.5
6.5
6.5
0
6.0
1.5
0.5
30
Backward(Ω)
2200
2200
2200
10000
10000
10000
10000
0
10000
10000
40000
10000
10000
10000
10000
10000
10000
10000
10000
2700
7.2
7.5
8.5
9.0
0
50
1.5
8.5
0.5