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● No.sound.comes.from.any.of.the.4th.keys.
Possible.Cause.1.:..The.connector.is.disconnected.or.the.cable.is.broken..
Solution.1.:
If this happens at the second and following sections of the sensor PWB, check
the cable connectivity between the sensor boards.
Solution.2.:
If you cannot solve the problem following Solution 1 or if the error happens
in the first section, remove the connector cover of the sound source unit and
check the cable contacts of the sensor relay (2), referring to 〔6〕
【B】.
Solution.3.:
Check if the sensor relay (2) is broken.
Possible.Cause.2.:.Failure.of.FPGA.board.
Solution.1.:
Referring to 〔6〕
【C】, replace the FPGA board.
● Only.a.certain.key.does.not.emit.sound.or.it.rarely.does.
Possible.Cause.1.:..The.hammer.stop.position.at.the.mute.mechanism.is.too.far.from.the.string..Or.the.sensor.
does.not.detect.it.well..
Solution.1.:
Refer to 〔3〕
【C】 “Adjusting the Sensor Height”, and adjust the sensor.
Solution.2.:
Referring to 〔4〕 【H】 “Adjusting the Volume Variability”, adjust the volume
per key.
Possible.Cause.2.:..The.shutter.is.missing.or.broken..
Solution.1.:
Referring to 〔3〕 【A】 “Extracting the Action Unit”, extract the action and
attach the shutter.
Possible.Cause.3.:..Something.is.abnormal.with.the.sensor..
Solution.1.:
Replace the board.
● No.sound.is.emitted.on.the.consecutive.keys.on.the.keyboard.
Possible.Cause.1.:..The.install.position.of.the.sensor.PWB.assy.is.floating.upwards.(too.far.from.the.shutter)..
Solution.1.:
Refer to 〔3〕
【C】 “Adjusting the Sensor Height”, and adjust the sensor.
Possible.Cause.2.:..Something.abnormal.with.the.sensor.board.
Solution.1.:
After replacing the board, install and adjust it according to 〔3〕
【C】 “Adjusting
the Sensor Height”.
● .Volume.levels.are.variable.or.only.strong.keystroke.makes.sound,.while.a.light.keystroke.does.not.
Possible.Cause.1.:..The.hammer.stop.position.at.the.mute.mechanism.is.too.far.from.the.string..Or.the.sensor.
does.not.detect.it.well.
Solution.1.:
Refer to 〔3〕
【C】 “Adjusting the Sensor Height”, and adjust the sensor.
Solution.2.:
Refer to 〔4〕 【H】 “Adjusting the Volume Variability”, and adjust the volume
key by key.
● No.sound.occasionally.comes.out.with.consecutive.keystroking.
Possible.Cause.1.:..The.sensor.malfunctions.when.the.hammer.hits.strongly.by.consecutive.stroking..
Solution.1.:
Bring the sensor closer to the string side.
Solution.2.:
Refer to 〔3〕
【C】“Adjusting the Sensor Height”, and adjust the sensor.
● Sound.was.stopped.or.deadened.while.depressing.the.key.
Possible.Cause.1.:..The.hammer.gets.back.to.the.sound.stop.position.when.it.returns.to.the.backstop..
Solution.1.:
Adjust the backstop at a position of 15 mm from the string.
