SERVICE MANUAL
5
φ
5
4.6 850
6
Lch input
4.5 850
7 GND
0 0
8
Rch input
4.5 860
9
Bias filter
5.9 850
10
Bass LPF (R)
4.6 850
11
Treble HPF (R)
4.6 850
12
Wch output
4.5 850
13
Rch output
4.4 850
14
Treble HPF (L)
4.6 850
15
Bass LPF (L)
4.5 850
16
Lch output
4.4 850
17
Woofer LPF 1
5.3 850
18
Woofer LPF 2
5.2 870
19
Woofer LPF 3
5.3 850
20
Vcc
8.9 300
21
Volume filter
3.2 870
22
Woofer LPF
4.5 870
23
SCL
4.8 1464
24
SDA
4.8 1464
Table 22 Functions and Service Data of LA78040/78041’s Pins
GDM8145 Multimeter
Ground Resistance (K
Ω
)
Pin No.
Function Description
Voltage of
Pin (V)
Measure with red probe
while grounding black probe.
Measure with black probe
while grounding red probe.
1
Ground
0 0
0
2
Vertical output terminal
9.73 0.58
0.58
3
Pump supply voltage input
24.88
∞
∞
4
In-phase input terminal
2.22 1.30
1.30
5
Inverting input terminal
2.22 4.58
4.55
6
Supply voltage
24.13 1.55
1.55
7
Pump supply voltage
output/vertical flyback pulse
output
2.61 7.09
5.93
48