I know I need to replace the contac strip under the keys. The "A" above middle C plays very loudly at times. Had the same problem years ago. I know what to fix, but how do I get the keys off the board. Do I need a special tool? Please help. I can't afford to get a repairman.
Thanks so much!
You probably need to just clean the circuit board and the conductive rubber contacts. There are two per key to facilitate reading the key velocity.
Use 99% isoprophyl alcohol and Q-Tips to clean both the board and the rubber contacts.
A rod is inserted lengthwise to hold the hammer weights while removing the boards. Use dowels from each end inserted about halfway back between the keys and the weight rods. Use a 1/4 inch dowel rod.
You have to take out a few screws to remove the boards from the key assembly. Be careful of the cables.
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SOURCE: How do I remove the keys from a Roland KR 4700
If these are semi weighted keys here is a cut and paste from a manual:
19. Disassembling the Keyboard Assembly
* After inserting a round stick (Rod: TX000670)
between the frame and the keys, remove the
circuit boards. (Fig. 23)
19-1 GHD EBUS L, MK SUB Circuit Board
(Time required: about 12 minutes)
Remove the seven (7) screws marked [260A]. The
GHD EBUS L and MK SUB circuit boards can then
be removed. (Fig. 24, Photo 5)
19-2 GHD M Circuit Board
(Time required: about 12 minutes)
Remove the five (5) screws marked [260B] and the
screw marked [262]. The GHD M circuit board can
then be removed. (Fig. 24)
19-3 GHD H Circuit Board
(Time required: about 12 minutes)
Remove the four (4) screws marked [260C] and the
screw marked [262]. The GHD H circuit board can
then be removed. (Fig. 24)
* Keys can be removed without removing the
circuit boards.
* After removing the GHD EBUS L, GHD M and
GHD H circuit boards, and the rubber contacts
can then be removed.
19-4 Rubber contact
Remove the GHD circuit board for the involved key.
The rubber contacts can then be removed.
The rod is inserted above the weighted hammer and the bottom of the keys from one end. It appears to be about 1/4 inch diameter dowel and will run the full length of the keyboard. You might use 3 foot ones from each end.
Screws are removed and the boards removed without taking the individual keys out.
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