Yamaha PX10 Service Manual page 59

Setups at the time of maximum output measurement
This item shall be tested with each measurement condition load resistances for each output terminals.
The burst signal described in the following fi gure is applied to each input terminals.
The peak-to-peak voltage of the last one wave of output burst signal (Vburst) should become a judgment value of a criterion.
When the shape of waves is read with an oscilloscope, the center of the emission line shall be adopted as the measurement value.
Each channel shall be tested at alone.
1mSec
20mSec
( Reference )
This item is to test the output ability of the power amplifi er. Please calculate from the gain of each channel and set an appropriate input
level.
In consideration of the accuracy of the signal generator and the measuring instrument, an input level that is about 0.5% higher than the
level with which the output of the lowest judgment value is expected is recommended.
3. Settings after the inspection has done
• Rotary potentiometers are adjusted the left end.
• A power switch is turned off."
500mSec
Close-up
The center of the emission line shall
be adopted as the measurement value.
Siganal
Cursor
PX10/PX8/PX5/PX3
Vburst
The last one wave of burst signal
shall be measured.
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