Kurzweil K2600 Series, Service Manual

Page: 97 / 172

Troubleshooting
Front Panel Problems
5-11
Front Panel Problems
Boots up with three Flashes
1. This indicates that the battery is low. Refer to Replacing the Battery on page 5-5.
2. Verify that U1 in the scanner circuitry is v5.04.
Note : If you are servicing a K2600R rack unit, U1 (M37451) is located on the Front
Panel/Scanner Board. If you are servicing a K2600 keyboard, U1 (M37451) is located on
the Scanner Board.
LCD not lit
1. Check the stranded wire cable at J1 on the Backlight Board and J104 on the Power Supply
Board.
2. Check the stranded wire cable at J2 on the Backlight Board.
3. Disconnect and reseat the cables.
4. Check the solder connections on the Power Supply, Backlight and LCD boards.
Buttons, Sliders or Controllers Not Working
1. Refer to the Interconnect Diagram. See page 5-14 for keyboard models or page 5-15 for
rack models.
2. Check all related interconnect cables.
3. Disconnect and reseat the cables.
4. Run the Scanner Tests.
5. Refer to the schematic diagrams and check signal path for the section not working.
6. Find and replace bad component(s).