Yamaha disklavier Mark III Series Maintenance Handbook page 49

3 [PK-CTL BOARD] — protect function
No. Message
06 LOUD PEDAL
TIME OUT !!
07 SOFT PEDAL
TIME OUT !!
08 SENSOR
LED ON ERROR!
09 SENSOR
NOT CONNECTED !
11 SOFT PEDAL
MUTE ERROR!
12 LOUD PEDAL OVER
LOAD! ERROR!
13 SOFT PEDAL OVER
LOAD! ->DISABLE!
14 PIANO POWER OFF!
(THERMOSTAT)
15 PIANO POWER OFF!
(PWM OVER)
Condition
The keyboard & sustain, soft/ shift
pedal playback stop → ' Press STOP
button to reset
Soft /shift playback playback stop →
Turn power off then back on to reset
LCD display only. Recording and
Keyboard measurement cannot be
performed
LCD display only. Recording and
Keyboard measurement cannot be
performed
LCD display only.
The keyboard & sustain, soft /shift
pedal playback stop → Press STOP
button to reset
Soft /shift playback playback stop →
Turn power off then back on to reset
The keyboard & sustain, soft /shift
pedal playback stop. Playback func-
tions cannot be restored until the sole-
noid has cooled down sufficiently.
The keyboard & sustain, soft /shift
pedal playback stop. Playback func-
tion cannot be restored until the drive
transistor(s) has/have cooled down
sufficiently and the power has been
turned off,then turned back on.
47
Contents and countermeasures
The sustain pedal solenoid continually requiries excessive
drive voltage to function. → Check sustain pedal acoustic
adjustment
The soft/shift pedal solenoid continually requiries exces-
sive drive voltage to function. → Check soft/shift pedal
acoustic adjustment
Data communication between emitter and receiver is not
done when LEDs are ON. → Check each connecter
Data communication between emitter and receiver is not
done when LEDs are OFF. → Check each connecter
The acoustic adjustment of the soft pedal is not correct →
Check pedal adjustment.
Sustain pedal movement and operation is not within
acceptable range. → Check the acoustic pedal adjustment
and pedal sensor board.
Soft/shift pedal movement and operation is not within
acceptable range. → Check the acoustic pedal adjustment
and pedal sensor board.
100V of power to Keyboard and pedal drive OFF.
Either the sustain or soft/shift solenoid thermostat has acti-
vated because the solenoid become too hot. → Check
pedal acoustic adjustments or replace the broken thermo-
stat .
100V (120V for Grand) of power to Keyboard and pedal
drive OFF.
One or more key drive transistors have become too hot and
the protect circuit has activated. → Check the drive board