Service manual

H57
3-7
Coretronic Corporation
3-2.5 Function Troubleshooting
A. OSD Does Not Show up
- Check the keypad cable and ensure there isn’t something wrong with the cable.
- Use the remote control for the OSD function test.
(Check the Keypad board and Keypad cable if the Remote control works as
well)
- Check the Main board.
B. Function Cannot Be Adjusted.
- Check the keypad cable and ensure there isn’t something wrong with the cable.
- Use the remote control for the OSD function test.
(Check the Keypad board and Keypad cable if the Remote control works as
well)
- Check the Main board.
3-2.6 Remote Controller Troubleshooting
A. No Function with Remote Controller.
- Replace the battery if there is no function.
- Use a well-functioning Remote controller for the function test.
(Replace the Remote controller if the new Remote controller works fine
with the Unit.)
- Check Main Board if the Unit works fine with a known good
Remote controller.