Kurzweil Mark Pro 2i, Service Manual

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Mark Pro TWOi
39
• The AC outlet is supplying power.
• The power jack is properly connected to the unit.
2. Check the power switch, power jack and AC adapter.
3. Refer to the Interconnect Diagram. Check all related connections.
4. Refer to the Amp Board schematics and check all supply voltages.
Audio Problems
No Audio
1. Refer to the Interconnect Diagram.
2. Check the standard wire from J9 on the Engine Board to J15 on the Amp Board.
3. Check the solder connections at the connectors.
4. Refer to the Engine Board schematics and check the signal activity on the DAC, U28.
6. Trace the signal path.
Front Panel Problems
Buttons, Knobs or Controllers not working
1. Run the Scanner Tests.
2. Refer to the Interconnect Diagram.
3. Check all related cables.