5
PMA-2000
IV
R
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, 502])
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-3432-1 (Lch) and 1U-3432-2 (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 ±0.5mV.
3. Then after 2 minutes warmup adjust VR501 and VR502 so that the DC Voltmeter reads 12 ±0.5mV.
4. And after 10 minutes warmup adjust VR501 and VR502 so that the DC Voltmeter reads 12 ±0.5mV.
METHOD OF ADJUSTMENTS
DC Voltmeter
Main Volume
1U-3432-2
Power Amp P.W.B. (R)
VR502
1U-3432-1
Power Amp P.W.B. (L)
VR501
Power
Trans
Power
Trans
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