5-12
Troubleshooting
Keyboard Problems
Keyboard Problems
Dead Keyboard
1. Check the flat ribbon cables connecting the keyboard Bass and Treble Contact Boards to
the Connector Board, locations J306 and J307. Be certain that the cables are not loose or
damaged.
2. Disconnect and reseat the cables.
3. Refer to the Connector Board schematics.
4. Check U1, IC Scanner 37451 on the Connector Board for keyboard signals.
5. Trace signal path.
6. Find and replace bad component(s) or order a board replacement.
Dead Note(s)
One or More in a Section
1. Remove related contact board.
2. Check contact strip for dirt, damage or wearing. Clean dirty contacts with denatured
alcohol. Replace damaged or worn contact strip.
3. Install contact strip.
4. If section is still dead, remove strip and check contact board for shorts, cold solder joints,
etc.
5. Find and replace bad component(s) or order replacement board.
Mechanical Noise
1. Check keyboard for broken key weights, support brackets, or ripped contacts.
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