ADJUSTMENT
Adjusting Idling Current
1. Preparation
(1) Prepare a DC voltmeter.
(2) Place the unit under normal usage conditions, away from highly ventilated areas such as next to an
air conditioning machine or electric fan.
The set requires an ambient temperature of 15℃ to 30℃ and standard humidity.
(3) Settings of This Unit
• POWER (Power source switch) STANDBY
• SPEAKER (Speaker terminal) No load
(Do not connect equipment such as speakers or dummy resistors.)
2. Adjustment Procedure
(1) Remove the top cover and turn VR510, VR520, VR530, VR540, VR550, VR560, VR570 of the AMP PCB
counterclockwise(
c
) as far as possible.
(2) Connect the DC Voltmeter to the test points.
FRONT-Lch : CN510
FRONT-Rch : CN550
CENTER ch : CN530
SURROUND-Lch : CN520
SURROUND-Rch : CN540
SURROUND-BACK Lch : CN560
SURROUND-BACK Rch : CN570
(3) Connect the power cord to an outlet. Next, press the power button to turn on the power.
(4) Set this unit as follows.
MASTER VOLUME : "---" (
c
min.) : turn counterclockwise to the lowest
position.
MODE : MCH STEREO
FUNCTION : DVD
(5) Turn VR550 clockwise (
x
) and adjust the voltage of the test point to "
1.5mV ± 0.5mV DC
" within 2
minutes.
(6) 10 minutes after the preliminary adjustment, turn VR510 and set the voltage to "
2.0mV ± 0.5mV
DC
".
(7) Adjust the variable resistance of each channel using the same method.
F Rch S Rch C Rch S Lch F Lch S Back Rch S Back Lch
VR550 VR540 VR530 VR520 VR510 VR570 VR560
SBRSBL
SL SR
CEN
FL
FR
CN550 CN540 CN530 CN520 CN510 CN570 CN560
DC Voltmeter
AMP UNIT
128
Caution in
servicing
Electrical Mechanical Repair Information Updating
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