Kurzweil SP5-8, Руководство по обслуживанию, Страница: 57 / 76

Troubleshooting & Maintenance
Front Panel Problems
5-5
Front Panel Problems
LCD not lit, LEDs are lit
1. If there is audio and the keyboard plays, check LCD contrast adjustment located on the
rear panel. Turn the pot back and forth to see if there is any change.
2. Refer to the Interconnect Diagram.
3. Check the ribbon cable from the LCD to J19 on the Engine PCB.
4. Disconnect and reseat the cable connectors.
5. Check the solder connections at the connectors.
6. Trace the signal path.
7. Find and replace bad component(s) or order a PCB replacement.
LCD, LEDs not lit, buttons, or controllers not working
1. Run the Scanner DIAG tests. If the tests pass, perform a hard reset.
2. Refer to the Interconnect Diagram.
3. Check all related cables. Disconnect and reseat the cables.
4. Check the solder connections at the connectors.
5. Check the Control Panel Bridge ribbon cable from the Right Front Panel PCB to the Left
Front Panel PCB.
6. Check the ribbon cable from the Right Front Panel PCB, J1, to the Engine PCB, J7.
7. Trace the signal path from the connector on the Engine PCB to the Right Front Panel
PCB.
8. Find and replace bad component(s) or order a PCB replacement.