Yamaha disklavier DS4M4 PRO Manual de mantenimiento - Página 22
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6. Regular field servicing
6 - 2. Removing / re-installing hammer sensor
Removing hammer sensor
Remove the 2 mini DIN connectors. ( for Hammer and key sensor )
Loosen and remove the hexagonal screws and hold up the sensor straight up slowly to avoid gray-scale
shutter damage.
Re-installing hammer sensor
1, Put up the sensor above the action with a slant.
2, Check the both sensor attaching bolt in the middle and shutter checking hole together.
3, Put on the sensor solowly to the flat position.
4, Execute the sensor caliblation,
( It takes around 3 minutes to complete.)
Note: No height adjustment is necessary but needs always caliblation to get correct height information.
always after removing, by using PRC100 controller.
MHB23 MKIV/PRO DIOV1.05, SCV.1.01 PAGE.20
You can work this adjustment
under Stand-by mode.