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from (13) and (20) will be directly fed into the (12) of woofer amplification integrated circuit N610
(TDA7297); and, as for the audio signals that have gone through sound tone processing , the audio
signals exported from the (18) and (15) will be directly fed into the (12) and (4) of the sound
amplifying integrated circuit N601 TDA7297 . The external capacitors C717 562 and C714 562
of the (19) and (14) of N701 TDA9860 are used as the treble control capacitors for left and right
channels. The (31) of N701 TDA9860 is a woofer control switch.
Table 3 lists the pin function and test data of TDA9860 as the reference for maintenance. The data is
tested under the mode of 49.75MHz PAL D/K and cylindrical color card, using a model FLUKE 79
instrument.
Table 3
Pin
Function
1
Pre-AV audio input of left channel
2
D-COIL
3
Interior audio input
4
Decoupling filter of power supply
5
Interior audio input
6
8V Power supply
7
AV audio output from right channel
8
Ground
9
Audio output from right channel
10
Audio input of right channel
11
Connecting terminal of bass control
capacitor
12
Connecting terminal of bass control
capacitor
13
Woofer frequency signal (L)
14
Connecting terminal of treble control
capacitor
15
Audio output, right channel
16
Clock line of I
17
Data line of I
18
Audio output, left channel
19
Connecting terminal of treble control
capacitor
20
Woofer frequency signal (R)
21
Connecting terminal of bass control
capacitor
22
Connecting terminal of bass control
capacitor
23
Audio input of left channel
24
Audio output from left channel
25
Ground
26
AV audio output from left channel
27
Connecting terminal of analog. stereo
capacitor
28
Post- AV audio input of left channel
29
Connecting terminal of analog. stereo
capacitor
2
C bus
2
C bus
Working
Resistance to Ground R
Voltage
Forward Test Back
V
4.0
4.6M
0.1
6.9M
4.0
4.7M
7.9
9.1K
4.0
4.6M
8.0
2.8K
4.0
6.5M
0
0
4.0
10.8K
4.0
4.6M
4.0
4.6M
4.0
4.7M
3.9
6.6M
4.0
6.2M
4.0
8.8K
4.4
19K
4.5
19K
4.0
8.9K
4.0
6.2M
3.9
6.5M
4.0
4.6M
4.0
4.6M
4.0
4.6M
4.0
10.8K
0
0
4.0
6.5M
4.0
4.6M
4.0
4.6M
4.0
4.6M
34
Circuit Explanation
Test
3.1M
4.9M
3.1M
9.1K
3.1M
2.8K
4.3M
0
10.8K
3.1M
3.1M
3.1M
3.9M~
4.2M
8.8K
17.9K
18.0K
8.9K
4.3M
3.9M
3.2M
3.2M
3.2M
10.8K
0
4.3M
3.2M
3.2M
3.2M
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