HK 990 (serv.man2) - Harman Kardon Audio Service Manual (repair manual). Page 7

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AMP Adjustment
Iding Adjustment
Precaution for handling measuring 
instrument
The ground side of the measuring 
instrument to be connected to the 
speaker terminal of this unit must 
be kept in floating condition 
because this unit is equiped with 
the floating balanced power 
amplifier.
Condition
 * Start adjustment 5 minutes or 
more after the power is turned on.
 * Non loaded condition.
Idling Adjustment
Adjust R53 so that the DC voltage 
of TP1 becomes +38mV .
R53
TP1
5
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