Keyboard Problems; Dead Keyboard; Dead Note(S) Or No Velocity Sensitivity; One Or More In A Section - Kurzweil sp5-8 Service Manual

Troubleshooting & Maintenance

Keyboard Problems

Keyboard Problems

Dead Keyboard

1. Follow the instructions outlined in Chapter 3 Diagnostics and run the Scanner DIAG
2. Check the flat ribbon cables connecting the Keyboard Bass and Treble Contact PCBs to
3. Disconnect and re-seat the cables.
4. Check the flat ribbon cable connectors at location J1 on the Right Front Panel PCB and J7
5. Trace the signal path.
6. Find and replace bad component(s) or order a PCB replacement.

Dead Note(s) or no velocity sensitivity

One or More in a Section

1. Check the keyboard cables for proper seating and damage. Make sure they are not
2. Remove related contact PCB.
3. Check the keyboard contact strip for dirt, damage or wearing. Clean dirty contacts with
4. Install keyboard contact strip.
5. If section is still dead, remove strip and check contact PCB for shorts, cold solder joints,
6. Find and replace bad component(s) or order a replacement PCB.
5-6
tests. If the tests pass, perform a hard reset.
the Right Front Panel PCB, locations J5 and J3 respectively. Be certain that the cables are
not loose or damaged.
on the Engine PCB.
pinched under the keyboard or elsewhere creating a short circuit.
denatured alcohol. Replace a damaged or worn keyboard contact strip.
etc.