Changhong Electric 21NF55, Service Manual, Page: 42 / 83

SERVICE MANUAL
40
Table 14 Functions and Service Data of TDA7057AQ (N600)’ s Pins
Table 1 5 Function and Service Data of TDA7449 (N650)’ s Pins
Digital Multimeter: Victor DT890D Pin
No.
Symbol
Reference Voltage (V) Positive Resistance (K
Ω
) Negative Resistance (K
Ω
)
1 CREF 4.0 28.2 21.9
2 VS 8.0 1.8 1.8
3 PGND 0 0 0
4 ROUT 3.3 9.4 9.3
5 LOUT 3.3 9.4 9.3
6 R_IN1 4.0 21.9 26.0
7 R_IN2 4.0 26.7 24.3.
8 L_IN1 4.0 26.7 24.3
9 L_IN2 4.0 21.9 26.1
10 MUXOUT(L) 4.0 24.5 22.5
11 MUXOUT(R) 4.0 24.5 22.5
12 BIN(R) 4.0 28.0 26.1
13 BOUT(R) 4.0 28.0 21.0
14 BOUT(L) 4.0 28.0 20.8
15 TREBLE(L) 4.0 28.0 26.1
16 BIN(L) 4.0 30.5 28.0
17 TREBLE(R) 4.0 30.5 28.0
18 DIG_GND 0 0 0
19 SCL 3.4 6.8 6.7
20 SDA 3.1 6.8 6.7
Notes:
③
The data are only for reference.
④
The data sheet may differ dependent on different models.
Digital Multimeter Pin
No.
Function Description
Reference Voltage (V) Positive Resistance (20K
Ω
) Negative Resistance (20K
Ω
)
1
Volume control input 0.95 6.85 6.15
2
Not connected 0.00
∞ ∞
3
Audio R signal input 2.38 12.59 6.51
4
Supply voltage 17.48 0.47 0.47
5
Audio L signal input 2.37 12.5 6.51
6
Ground 0.00 0.00 0.00
7
Volume control input 0.95 6.85 0.15
8
Left channel in-phase signal output 8016 6.46 5.59
9 Ground 0.00 0.00 0.00
10
Left channel inverting signal output 8.25 6.46 5.59
11
Right channel inverting signal output 8.24 6.46 5.59
12
Ground 0.00 0.00 0.00
13
Right channel in-phase signal output 8.13 6.46 5.59