Yamaha PX10 Service Manual page 52

PX10/PX8/PX5/PX3
2) The index of the rotary potentiometer of both A/B is aligned
with the minimum position as follows.
It will end, if the both SIGNAL LED lights up.
The voltage value for every click saves in the fl ash memory.
〈 Service inspection screen 〉
Left end✽is a selecting cursor.
The fault location at the time of FAIL
This is not failure. This cause was not successful when you
performed calibration.
It is necessary to retry "5-14-3. Calibration 2".
52
5-15 Power off
Contents Inspect the shutdown of the power supply when
POFF-REQ is activated.
At this time, it also checks that /PWR-OFF occurs
automatically.
Advance preparation None.
Note
In Final Assy or Service inspection, A power supply is
shut down while the power switch has been an ON state.
You need to turn off a power switch manually, after
ending an inspection visually.
It is set to "FAIL" when there is no response, even if
PWR-OFF becomes temporary standard time.
〈 Service inspection screen 〉
The fault location at the time of FAIL
Around /POFF-REQ, POFF-REQ.