Akai 29CT24FS, Service Manual

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SERVICE MANUAL
Table 14 Functions and Service Data of TDA8944J (N603)’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 15 Functions and Service Data of LA78040/78041 (N301)’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
∞
∞
(continued)
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