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 VR401 (ALL Channel) of the AMP PCB counterclockwise(
c
) as far as
possible.
(2) Connect the DC Voltmeter to the test points.
FRONT-Lch
: TP401 : VR411
FRONT-Rch
: TP402 : VR412
CENTER ch
: TP403 : VR413
SURROUND-Lch
: TP404 : VR414
SURROUND-Rch
: TP405 : VR415
SURROUND-BACK Lch
: TP406 : VR416
SURROUND-BACK Rch
: TP407 : VR417
(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
: DVD
(5) Turn VR4800 clockwise (
x
) and adjust the voltage of the test point to "
6.0mV ± 0.5mV DC
" within 2
minutes.
(6) 10 minutes after the preliminary adjustment, turn VR401 and set the voltage to "
8.0mV ± 0.5mV
DC
".
(7) Adjust the variable resistance of each channel using the same method.
CP501
VR401
VR404
CP504
VR403
CP503
VR405
VR402
CP505
CP502
VR406
CP506
VR407
CP507
F Lch
S Lch
F Rch
C ch
S Rch
S Back Lch
S Back Rch
DC Voltmeter
AMP UNIT
149
Caution in
servicing
Electrical
Mechanical
Repair Information
Updating