Power Problems; Dead: Lcd, Leds Not Lit; Audio Problems; No Audio - Kurzweil sp5-8 Service Manual

Troubleshooting & Maintenance

Power Problems

Power Problems

Dead: LCD, LEDs not lit

Before opening the unit, verify the following:
1. The AC outlet is supplying power.
2. The AC cord is good and properly connected to the unit.
3. Check the power switch, DC power jack, and DC power adapter. The adapter rating
4. Open the unit. Follow the procedures on pages 4-2 through 4-3 to remove the top
5. Refer to the Right Front Panel PCB schematics and check all supply voltages.

Audio Problems

No Audio

1. Try playing a demo to rule out a keyboard problem. Press the Demo buttons
2. Follow the instructions outlined in Chapter 3 Diagnostics and run the Scanner DIAG
3. If a volume pedal is plugged in, make sure it is not set to minimum. Or, power-off,
4. Refer to the Interconnect Diagram. Check the flat ribbon cable from J11 on the Engine
5. Check the solder connections at the connectors.
6. Refer to the Engine PCB schematics, page 7-6, and check the signal activity on the DAC,
7. Trace the signal path from the Engine PCB through the Left Front Panel PCB to the audio
5-4
must be 15VDC, 1.0A minimum, center pin +.
enclosure.
(simultaneously press the User and All category buttons).
tests to check the volume control operation.
unplug the volume pedal, them power on again.
PCB to J7 on the Left Front Panel PCB.
U15.
jacks.