Troubleshooting & Maintenance
Power Problems
5-4
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
must be 15VDC, 1.0A minimum, center pin +.
4. Open the unit. Follow the procedures on pages 4-2 through 4-3 to remove the top
enclosure.
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
(simultaneously press the User and All category buttons).
2. Follow the instructions outlined in Chapter 3 Diagnostics and run the Scanner DIAG
tests to check the volume control operation.
3. If a volume pedal is plugged in, make sure it is not set to minimum. Or, power-o,
unplug the volume pedal, them power on again.
4. Refer to the Interconnect Diagram. Check the at ribbon cable from J11 on the Engine
PCB to J7 on the Left Front Panel PCB.
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,
U15.
7. Trace the signal path from the Engine PCB through the Left Front Panel PCB to the audio
jacks.
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