Haier HT-2180, Руководство по обслуживанию

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28
Reference Voltage(V)
Reference Resistance(K
Ω
)
Pin Function
Without
signal
With signal
Forward(
Ω
) Backward(
Ω
)
40 Line AFC filtering 6.6 6.6 800 2000
41 External video/Y signal input 1.6 1.6 800 2000
42 Digital circuit grounding 0 0 0 0
43 PIF composite video signal input 3.3 3.3 800 2000
44 Black level detection filtering 2.3 2.3 800 4000
45 External chrominance signal input 2.9 2.9 800 2000
46 Y/C circuit power supply 5.0 5.0 500 1200
47 PIF and SIF composite signal
output
3.8 3.8 680 900
48 Intermediate frequency locked
phase loop filtering
4.7 4.7 800 2000
49 VCO and SIF grounding 0 0 0 0
50 Intermediate frequency VCO 8.1 8.1 550 1000
51 Intermediate frequency VCO 8.1 8.1 650 1000
52 VCO and SIF power supply 9.0 9.0 450 600
53 SIF signal input and horizontal
curve correction
4.5 4.5 820 2000
54 SIF smooth filtering 5.6 5.6 800 1300
55 External audio input 4.2 4.2 800 2000
56 FM DC negative feedback 3.5 3.5 800 2000
N901 TMP87CK38N(87CM38N)
Reference Voltage(V) Reference Resistance Pin Function
Without
signal
With
signal
Forward(
Ω
) Backward(
Ω
)
1 Power supply grounding 0 0 0 0
2 Tuning voltage output * * 700 8000
3 Vacant pin 5.0 5.0 700 8000
4 Mute 5.0 0 700 8000
5 External mute 5.0 0 700 8000
6 Vacant pin 0 0 700 8000
7 Standby power supply 2.0 2.0 700 8000
8 Vacant pin 1~4.2 1~4.2 700 8000
9 Band 1 0~4.8 0~4.8 700 3500
10 Band 2 0~1.7 0~1.7 700 3000
11 Clock bus control 5.0 5.0 700 15000
12 Digit bus control 5.0 5.0 600 15000
13 AFC input 2.3 2.3 700 3000
14 Karaoke switch 0 0 600 10000
15 Keyboard matrix input 4.0 4.0 700 10000
16 Keyboard matrix input 4.0 4.0 680 10000
17 Vacant pin 0 0 700 10000
18 Vacant pin 0 0 700 10000
Circuit Explanation