Haier HT-2599 Service Manual page 17

VII. IC function pins
1. Integrated circuits used in this model
1) TBA1238AN: picture intermediate amplification, sound intermediate amplification,
video signal processing, chrominance signal processing, RGB output circuit, horizontal
and field oscillating scan circuit.
2) TMP87CK38N: super central micro-processing unit.
3) LA7830 (LA7833): field scan circuit
4) LA4275: sound power amplifier circuit
5) LA7910: wave band change-over switch
2. IC functions and parameters
N402
No. Function
1 Grounding
2 Output
3 Pump power supply output
4 Field scanning sawtooth signal input
5 Field scanning
forming terminal
6 Field power supply
7 Field power supply input
Item Function
1 Grounding
2 Power amplifier output
3 Power supply
4 Ripple wave filtering
5 Grounding
6 Audio Input
7 Feedback
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
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Reference
Voltage(V)
sawtooth signal
N701
Reference
Voltage(V)
Reference Voltage(V) Reference Resistance(KΩ )
Without
signal
5.0
3.5
9.0
2.1
0
2.0
LA7830 (LA7833)
Reference Resistance(KΩ )
Forward
0 0
14 0.45
24(26) 0.5
0.9 0.9
0.8 0.65
24(26) 0.5
1.9 0.72
LA4275
Reference Resistance(KΩ )
Forward
0 0
10 0.55
20 0.42
10 1.2
0 0
0.7 1.1
0.2 0.72
TB1238AN
With
Forward(Ω)
signal
5.0 800
3.5 750
9.0 460
2.1 750
0 0
2.0 680
Backward
0
1.6
∞
1
1.4
4.5
30
Backward
0
4.5
2.8
2.4
0
∞
2.0
Backward(Ω)
2000
2000
600
600
0
2000