Offset Adjustment & Idle Current Adjustment; Dc Offset/Idle Current Adj - Harman Kardon AVR7300 Service Manual

AVR7300
AVR7300 OFFSET ADJUSTMENT & IDLE CURRENT ADJUSTMENT(MP stage)
1 DC Offset - Adjustment
* Function : 8CH DIRECT INPUT
Volume level : minimum
Test position : Speaker out terminal (between "+" and "-")->speaker jack
: no load
Adjustment:
a. Turn power ON
b. Adjust to chart below.
Channel Check point
FRONT L CH FL SPEAKER
REAR L CH SL SPEAKER
SURRBACK L CH SL SPEAKER
REAR R CH SR SPEAKER
SURRBACK R CH SBR SPEAKER
FRONT R CH FR SPEAKER
CENTER CH CTR SPEAKER
c. After 5 Min. check again at same figure.
2 Idle - Adjustment
* Function : 8CH DIRECT INPUT
Volume level : minimum
Test position : refer to chart below
Adjustment:
a. Turn power ON, adjust to about 6.0~7.0mV.
Channel Check point
FRONT L CH P101(R172)
REAR L CH P201(R272)
SURRBACK L CH P301(R372)
REAR R CH P401(R472)
SURRBACK R CH P501(R572)
FRONT R CH P601(R672)
CENTER CH P701(R772)
c. After 5 Min. Adjust again to the same figure
Adjustment position
VR11(3channel AMP)
VR21(3channel AMP)
VR31(3channel AMP)
VR41(4channel AMP)
VR51(4channel AMP)
VR61(4channel AMP)
VR71(4channel AMP)
Adjustment position
VR12 (3channel AMP)
VR22 (3channel AMP)
VR32 (3channel AMP)
VR42 (4channel AMP)
VR52 (4channel AMP)
VR62 (4channel AMP)
VR72 (4channel AMP)
Adjustment Limit Note
0±10mV FL
0±10mV SL
0±10mV SBL
0±10mV SR
0±10mV SBR
0±10mV FL
0±10mV CT
Adjustment Limit Note
12.0mV~13.0mV FL
12.0mV~13.0mV SL
12.0mV~13.0mV SBL
12.0mV~13.0mV SR
12.0mV~13.0mV SBR
12.0mV~13.0mV FL
12.0mV~13.0mV CT
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harman/kardon