Denon PMA-A100, Service Manual

Page: 14 / 52

14
IDLING ADJUSTMENT
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
1U-3708-2
Power Amp P.W.B. (R)
VR502
1U-3708 -1
Power Amp P.W.B. (L)
VR501
Power
Trans
Power
Trans