Yamaha Silent SB Series Service Manual page 28

SILENT SB SERIES
•KEY SENSOR MEASUREMENT
When key sensor unit or key sensor board has been replaced, the sensor must store the correct relational measured data
between the key movement and the sensor light transition quantity. According to this procedure, the virtual 4 key sensing
points (K1 - K4) will be created on the gray scale stroke. The measurement is based on the calculation of 2 points that are
the key rest position and the stroke end. After entering the mode, it takes around 30 sec. until the sensor gives a steady light
quantity.
Entering the mode
1, Start measurement
2, Measure rest position
3, Write rest position data
4, Measure end position
5, Write end position data
Calc. and store the data
Notes: Individual measurement would be effective,
when a shutter has been replaced.
when a note sounds diffrent from others and the sensor test 4 beeps comes incoorrectly.
when a note was not at the rest position or has played uneven during sensor measurement.
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All key measurement
Hold F#, G#, A# (10, 12, 14 keys)
and turn on the power.
Wait for more than 30sec.
harmony sound every 2 sec.
Depress loud (right) pedal once to
Start. --> harmony sound twice
Check all keys are in the rest position
by eyes.
Depress loud (right) pedal once to
write the data on the RAM. -->
Harmony sound 3 times
Play through 1-88 keys.
Depress loud (right) pedal once to
write the data on the RAM. -->
harmony sound every 2 sec.
Depress soft (left) pedal once to
store data on the EPROM.
--> 76C sound intermittently.
Individual key measurement
Hold F, G, (9, 11 keys) and turn on
the power.
Harmony sound twice.
Depress the keyboard to be
measured to start.
--> the note sound twice
Check the keys is in the rest position
by eyes.
Depress loud (right) pedal once to
write the data on the RAM.
--> the note sound 3 times
Play the key.
Depress loud (right) pedal once to
write the data on the RAM. -->
the note sound twice.
Repeat 1-5 to measure others.
Depress soft (left) pedal once to
store the data on the EPROM.
--> 76C sound intermittently.