Kurzweil PC88 - Page 90

Chapter 4 Troubleshooting
Keyboard Problems
Keyboard Dead
1. Eliminate loose cables. Check cable connections to
the Engine Board and Contact Boards.
2. Refer to the Schematic Diagrams and check the
keyboard signals at U17 on the Engine Board.
3. Trace signal path.
4. Find and replace bad component(s).
5. If necessary, order an Engine Board replacement.
Treble or Bass Section Not Playing
1. On the Engine Board, Location J6 for Treble or J5
for Bass, check the flat ribbon. Be sure it is properly
seated. Disconnect and reseat, if necessary.
2. Check to see it the Treble or Bass Section is now
working. If not, swap the Treble and Bass ribbon
cables. See if the problem moves with the cable. If
it does, remove the keyboard and check the
connections, cable and keyboard section associated
with the problem.
If the problem does not move with the cable,
proceed to point 3.
3. Refer to the Engine Board Schematic. Check
components tied to J6, Treble or J5, Bass for
activity.
4. Find and replace bad component(s).
5. If necessary, order circuit board replacement.
PC88 Service Manual
4-10