Main Board - is the large SQUARE board mounted on the front of the electronics chassis (right side board if you are facing the two boards). Most of the control functions are placed on the main board and there is little to trouble shoot. Testing of the DC power supply can be done by probing the test points on the main board. (See our blog entry for troubleshooting the DC Power Supply) This is the main mechanism used to troubleshooting the DC power supply. However, a bad main board can "Pull Down" the DC power supply. Disconnecting the DC power supply from the main board and testing the power supply directly can help troubleshoot a bad main board. It never hurts to remove all connectors (power off of course) and make sure none of the pins of the connectors or recipticals are bent. We've seen that happen ! Other than that - remove and replace a bad or suspected main board with a known working main board, or send it to us for testing.
