19
IDLING ADJUSTMENT
Setup
1. Lay the unit at an ordinary position away from a direct current from an air condition or fan. Do the adjustment at a
temperature between 15°C (59°F) and 30°C (86°F).
2. Set control as follows.
POWER SWITCH
→
OFF (
j
)
VOLUME CONTROL
→
Fully counterclockwise in the minimum position
(
c
)
.
(Main Volume and Semifixed resistors [R581, R582])
SPEAKER Terminals
→
Open: do not connect the speakers, dummy load etc.
Adjustment
(1) Remove top cover. And then connect DC Voltmeter to test points of 8U-110133-1 (Lch) and 8U-110133-2 (Rch)
Power Amp Printing Wiring Board.
(2) Connect power cord to AC wall outlet, and turn POWER switch "ON" (
h
). Within 10 seconds turn R581 (Lch) and
R582 (Rch) clockwise so that the DC Voltmeter reads 2 ±0.5mV.
(3) Then after 2 minutes warmup adjust R581 and R582 so that the DC Voltmeter reads 6 ±0.5mV.
IDLING CURRENT
Setup
1. Lay the unit at an ordinary position away from a direct current from an air condition or fan. Do the adjustment at a
temperature between 15°C (59°F) and 30°C (86°F).
2. Set control as follows.
POWER SWITCH
OFF (
).
VOLUME CONTROL
Fully counterclockwise in the minimum position ( ).
(Main Volume and Semifixed resistors [VR501, VR502])
SPEAKER Terminals
Open: do not connect the speakers, dummy load etc.
Adjustment
1. Remove top cover. And then connect DC Voltmeter to test points of 1U-3708-1 (Lch) and 1U-3708-2 (Rch) Power Amp
Printing Wiring Board.
2. Connect power cord to AC wall outlet, and turn POWER switch "ON" (
). Within 10 seconds turn VR501 (Lch) and
VR502 (Rch) clockwise so that the DC Voltmeter reads 12 ±5mV.
3. Then after 2 minutes warmup adjust VR501 and VR502 so that the DC Voltmeter reads 12±5mV.
4. And after 10 minutes warmup adjust VR501 and VR502 so that the DC Voltmeter reads 12±5mV.
DC Voltmeter
Main Volume
8U-110133-2
Power Amp P.W.B. (R)
R582
8U-110133 -1
Power Amp P.W.B. (L)
R581
Power
Trans
Power
Trans
