Troubleshooting Guide

Well, we sincerely hope you get to skip this portion of the manual, but this is here to help in the event of an emergency. Remember the detrimental effects an incorrectly installed component may have on your circuit. Keep this in mind as you troubleshoot your circuit for possible assembly errors.

PROBLEM: Nothing at all on the output of the mixer.

SOLUTION: Check your power supply voltages to make sure you have at least 12 volts between the tab of VR1 and pin 4 of U4. If that is not it, check all ICs for proper installation. Thereafter it’s a matter of testing your source signal and that your destination is connected properly.

PROBLEM: Left or right channel is out.

SOLUTION: This is a classic trouble shooting problem. Now is a great time to have a little fun and teach yourself some trouble shooting skills. Make sure a signal is present on both left and right inputs, then trace through the circuit using an oscilloscope or DMM set on AC to find where the signal stops. You will need to use the schematic and the board layout to assist in finding the signal path.

PROBLEM: One or more LEDs do not light.

SOLUTION: Uh-oh ! Check the orientation of the LEDs to make sure you put them in the correct way. Try reversing the orientation of the unlit LEDs to see if they light then.

PROBLEM: When running the output of this into the FM10A or FM25B, I seem to be driving the transmitters into distortion when MAIN is turned up full. SOLUTION: Because the MX10 has some gain, you will either need to keep the MAIN adjustment from going all the way to full, or you can open the FM10A or FM25B, and adjust the controls for level on their inputs.

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