Yamaha PX10 Service Manual page 50

PX10/PX8/PX5/PX3
5-14. Rotary potentiometer
5-14-1. VOL-ALT positive
This is not tested for service inspection of PX amplifi er.
5-14-2.VOL-ALT negative
This is not tested for service inspection of PX amplifi er.
5-14-3.Calibration 2
Contents The voltage for every click of all rotary potentiometer
with large variation is acquired.
Advance preparation
The index of both rotary potentiometer A/B is adjusted in the
maximum position.
1) A start of execution will light up SIGNAL LED of both A/B.
SIGNAL LED means "permitting rotation".
2) The rotary potentiometer of both A/B is turned to the left
(1 click, counterclockwise rotation).
CLIP/LIMIT LED of both A/B lights up.
CLIP/LIMIT LED means "under voltage acquisition",
"prohibiting rotation".
Don't rotate the rotary potentiometer.
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3) If SIGNAL LED of both A/B lights up, it means that voltage
acquisition of this position was completed.
2) 3) is repeated in order to acquire the voltage of the next click position.
4) It will end, if the index of a variable resister arrives at the
minimum position.
An end can be checked because SIGNAL LED lights down.
Note
If you have turned 2 or more clicks at once, at this time,
an error will not be displayed but will be ended normally.
(an error will display in 5-14-4. Confi rm & Save 2.)
If there is consciousness that you have turned 2 or more clicks at
once, you should retry operation independently
When retry operation, the [BACK] switch is pushed and canceled
once again. And it returns to a maximum position and retry
from 1).