Changhong Electric PF2939, Service Manual, Page: 26 / 47

SERVICE MANUAL
Table 5 Functions and Service Data of TDA8350Q-N6 (N401)’s Pins
Digital Multimeter
Pin No. Function Description
Reference
Voltage (V)
Positive
Resistance
(20K
Ω
)
Negative
Resistance
(20K
Ω
)
1 Vertical drive input (positive) 2.33 5.16 2.70
2 Vertical drive input (negative) 2.25 5.16 2.70
3 Feedback input 8.03 3.82 2.14
4 Supply voltage 17 4.76 1.83
5 Output 1 7.98 3.84 2.14
6 Not connected 0
∞ ∞
7 Ground 0 0 0
8 Pump supply voltage input 47.57
∞
1.84
9 Output 2 8.8 3.84 2.14
10 Guard output 0.18 10.05 3.04
11 Pincushion output 16.85 8.48 1.83
12 Pincushion input (negative) 0.74 4.75 2.78
13 Pincushion input (positive) 0 0 0
Table 6 Functions and Service Data of TDA8944J (N361)’s Pins
Digital Multimeter
Pin
No.
Functions Description
Reference Voltage
(V)
Positive Resistance
(20K
Ω
)
Negative Resistance
(20K
Ω
)
1
Negative loudspeaker terminal 1
7.58
2.74 2.47
2
Ground channel 1
0 0 0
3
Supply voltage channel 1
15.28 0.65 0.65
4
Positive loudspeaker terminal 1
7.6
2.76 2.46
5
Not connected
0
∞ ∞
6
Positive input 1
7.6 3.37 3.02
7
Not connected
0
∞ ∞
8
Negative input 1
7.6
3.36 3.02
9
Negative input 2
7.6 3.36 3.02
10
Mode selection input (standby,
mute, operating)
0.04 3.51 2.81
11
Half supply voltage decoupling
(ripple rejection)
7.6 3 2.88
12 Positive input 2 7.6
3.25 2.90
13 Not connected 0
∞ ∞
14 Negative loudspeaker terminal 2 7.6 2.88 2.47
15 Ground channel 2 0 0 0
16 Supply voltage channel 2 15.25 0.65 0.65
17 Positive loudspeaker terminal 2 7.58 2.77 2.46
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