M-IS22V
21
7.1 SINGLE OPERATION METHOD
7. GENERAL INFORMATION
MAIN
ASSY
A
INPUT SIGNAL
10mV
OUTPUT SIGNAL
R85 – 1k
Ω
CONTROLL
0V, 5V or 12V
CONNECT
"A" POINT (GND)
(FOUR PLACES)
SIDE B
Single operation method and input level.
The procedure and the input level of a single operation are shown below.
1. Short R85 with 1k
Ω
.
2. Connect the four “A” points of the figure below.
GNDs are not common because it is independent with chassis GND (GND of the amplifier), B1GND, B2GND, and B3GND.
The potential of B1GND, B2GND, and B3GND becomes same level as chassis GND by connecting the four “A” points.
2. The power supply of the unit is turned on.
3. The terminal CONT (2 pin of CN3332) are controlled respectively by the following voltages.
CONT
12V
5V
0V
RY
ON
ON
OFF
MUTE
OFF
ON
ON
4. The signal of 10mV is input from the input terminal (JA3333), and the output is confirmed with the speaker terminal (CN3331).
Note : If the music signal is input directly to the input terminal (JA3333) with CD PLAYER etc. , the output becomes a large sound because
there are 40dB GAIN of the amplifier.
Caution when disassembling.
Even if the power supply cord is pulled out from the outlet, neither C11 nor C12 of the AF ASSY are discharged.
Please discharge C11 and C12 of the AF ASSY with the resistor of 100
Ω
or more before removing the AF ASSY or the POWER SUPPLY ASSY.
As there is a possibility to destroy the transistor, discharge with the resistor of 100
Ω
or more.
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