Rolland HP-1700 - Keys stuck down

Synth Repair
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1

Hello,

I just got the Rolland HP-1700 off Facebook market place. It was listed as one of the keys being stuck. The only key that was initially stuck was the E above middle C. After I removed the E above middle C, cleaned and inspected it with no visible wear, then the F key would stick as well as the E. Almost worse than before. Although when the action is suspended, no keys stick. After further inspection and replacement now the D, E, and F keys stick. The black key in the middle does not. I then tried an E key in the same spot from a differentpart of the piano and it stuck as well although the sticky

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E felt sticky in place of one that was not sticky before

• Model & revision/OS:
• Symptoms (what changed, when):
• Tests already done (voltages, parts replaced):
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2

Check the key guides are at a straight 90 degrees up from the frame or remove the adjacent black key and eyeball the guide posts position and apply some grease. You can probably salvage some grease off from another keys post for test purposes. Good luck!