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Idling Current Adjustment
• Perform adjustments in the HI-VOLTAGE mode.
1 Adjustment point
Semi-fixed resistors VR101, VR201 of amplifier board.
2 Precautions on adjustments
1. Set the RCA input terminal to open.
2. Apply a voltage of 14.4V between the +12V terminal, REMOTE
terminal, and GND terminal.
3. Rotate the above semi-fixed resistors completely in the coun-
terclockwise direction while observing the component side.
4. Check that the voltage at the adjustment point becomes 0 mV
in step 2.
5. Fine adjustments may be required according to the characteris-
tics of the MOS-FET used.
• When adjusting the idling current
Rotating the semi-fixed resistor in the clockwise direction:
In creases the idling current
Rotating the semi-fixed resistor in the counterclockwise direc tion:
Decreases the idling current
* Take note that rotating excessively in the clockwise direction
will increase the idling current suddenly.
3 Approximate adjustment values
Adjust as follows so that the following voltages become
0.4 to 0.5 mV .
L channel :
Voltage between TP101 and TP102: Use VR101 of the ampli-
fier board
R channel :
Voltage between TP201 and TP202: Use VR201 of the ampli-
fier board
8
SECTION 4
ELECTRICAL ADJUSTMENTS
Adjustment Location
Connection :
- AMPLIFIER BOARD - (Component side)
TP202
TP102
TP201
(R-CH) VR201
VR101 (L-CH)
IDLING
TP101(L-CH)
TP201(R-CH)
TP102(L-CH)
TP202(R-CH)
TP101
Digital voltmeter
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