My YPG-635 had a couple of keys that weren't sounding, so I figured I would take it apart and troubleshoot. I found damaged traces on LOW key CB. Repaired and works fine. I took the key bed completely apart for cleaning Key bed is all over my kitchen island. I took out all the hammers when doing the cleaning and lubing, not realizing that they were different. I have a chart from the service manual that shows 4 different weights for different parts of the keyboard. W1, W2,W3 and W4. Problem is, my keys are all of those, but have a dash number after the letter, like W-8, W-0, etc.. Have to figure out what the dash numbers are. I actually have a couple that are duplicates, like W-1. Same with the black keys, B1-9 etc.. Baffling. ARRRGGGHHH!
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