Functions And Service Data Of La78040/78041 (N301)’S Pins - Akai 29CT24FS Service Manual

Table 14 Functions and Service Data of TDA8944J (N603)'s Pins
Pin
Functions Description
No.
1 Negative loudspeaker terminal 1
2 Ground channel 1
3 Supply voltage channel 1
4 Positive loudspeaker terminal 1
5 Not connected
6 Positive input 1
7 Not connected
8 Negative input 1
9 Negative input 2
Mode selection input (standby,
10
mute, operating)
Half supply voltage decoupling
11
(ripple rejection)
12 Positive input 2
13 Not connected
14 Negative loudspeaker terminal 2
15 Ground channel 2
16 Supply voltage channel 2
17 Positive loudspeaker terminal 2
Table 15 Functions and Service Data of LA78040/78041 (N301)'s Pins
Pin No. Function Description
1
Ground
2
Vertical output terminal
3
Pump supply voltage input
SERVICE MANUAL
Reference Voltage Positive Resistance
(V)
7.98
0
14.9
7.3
0
7.3
0
7.4
7.3
0
7.6
7.3
0
7.3
0
14.8
7.3
Voltage of
Pin (V)
0
9.73
24.88
44
Digital Multimeter
Negative Resistance
(20KΩ)
∞
0
5.8
∞
∞
∞
∞
∞
∞
7.8
∞
∞
∞
∞
0
3.5
∞
GDM8145 Multimeter
Ground Resistance (KΩ)
Measure with red
probe while
grounding black
probe.
0
0.58
∞
(20KΩ)
∞
0
7.7
∞
∞
∞
∞
∞
∞
8.9
∞
∞
∞
∞
0
3.5
∞
Measure with
black probe
while grounding
red probe.
0
0.58
∞
(continued)