HK 3490 - Harman Kardon Audio Service Manual (repair manual). Page 66

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      1. Adjust VR31 to set 21.12mV(±5%) on DC EVM.
      2. Adjust VR32 as same way above. 
HK3490/3390 idle current Adjustment
harman/kardon
HK 3490/230 Service Manual
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