Changhong Electric 21BM91, Руководство по обслуживанию, Страница: 49 / 58

SERVICE MANUAL
Table 20 Functions and Service Data of TDA8944J’s Pins
Digital Multimeter
Pin
No.
Functions Description
Reference Voltage
(V)
Positive Resistance
(20K
Ω
)
Negative Resistance
(20K
Ω
)
1 Negative loudspeaker terminal 1 7.98
∞ ∞
2 Ground channel 1 0 0 0
3 Supply voltage channel 1 14.9 5.8 7.7
4 Positive loudspeaker terminal 1 7.3
∞ ∞
5 Not connected 0
∞ ∞
6 Positive input 1 7.3 ∞ ∞
7 Not connected 0
∞ ∞
8 Negative input 1 7.4
∞ ∞
9 Negative input 2 7.3 ∞ ∞
10
Mode selection input (standby,
mute, operating)
0 7.8 8.9
11
Half supply voltage decoupling
(ripple rejection)
7.6
∞ ∞
12 Positive input 2 7.3
∞ ∞
13 Not connected 0
∞ ∞
14 Negative loudspeaker terminal 2 7.3
∞ ∞
15 Ground channel 2 0 0 0
16 Supply voltage channel 2 14.8 3.5 3.5
17 Positive loudspeaker terminal 2 7.3
∞ ∞
Table 21 Functions and Service Data of TA1343N’s Pins
Digital Multimeter
Pin No. Function Description
Reference Voltage (V) Positive Resistance (20K
Ω
)
1
Offset canceling filter
4.6 850
2 φ
2
4.6 850
3 φ 3
4.6 850
4 φ
4
4.6 850
(Continued)
47