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
( (ALL Channel) of the MAIN PCB counterclockwise(
c
) as far
as possible.
(2) Connect the DC Voltmeter to the test points.
FRONT-Lch : CN510 : VR510
FRONT-Rch : CN550 : VR550
CENTER ch : CN530 : VR530
SURROUND-Lch : CN520 : VR520
SURROUND-Rch : CN540 : VR540
(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.
SPEAKER (Speaker terminal) : No load
(Do not connect equipment such as speakers or dummy resistors.)
MODE : MCH STEREO
FUNCTION : CBL / SAT
(5) Turn
VR510
clockwise (
x
) and adjust the voltage of the test point to "
2.0mV ± 0.5mV DC
" within 2
minutes.
(6) Check whether the voltage is within the range "
2.0mV +2mV/-1mV DC
" 10 minutes after adjust-
ment.
(7) Adjust the variable resistance of each channel using the same method.
CN540VR540VR510 CN510 VR520 CN520 VR530 CN530 VR550 CN550
F Lch
S Lch
C ch
S Rch
F Rch
DC Voltmeter
MAIN PCB
73
Caution in
servicing
Electrical Mechanical Repair Information Updating
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