Kurzweil PC88 - Page 86

Chapter
4
Troubleshooting
Front Panel Problems
On power up, the PC88 should come up in the
Internal
Voices
mode
with
Classical
Piano
selected
and
have the following LEDs lit:
Zone 1, green LED
Internal Voices, green LED
Classical Plano, red LED
Effects Stage and Bright, red LEDs
LCD not lit, no characters displayed, LEDs are lit
Is there audio and does the keyboard respond? If
yes, then:
1. Check LCD contrast adjustment located on the rear
panel. Turn the pot back and forth to see if there is
any change.
2. Check the ribbon cable from the LCD Board to J7 on
the Engine Board. If necessary, disconnect and
reseat.
3. Check the cable from the LCD Board to J15 on the
Engine Board. If necessary, disconnect and reseat.
4. Check solder connections.
5. Refer to Schematic Diagrams. Check for correct
voltages in signal path.
6. Find and replace bad component(s).
7. If necessary, order circuit board replacement.
PC88. Service Manual
4-6