What was found
(CAN) 2 ADF UNSERVICEABLE. VOLTAGE OUTPUT ON PIN 48=323V. AND ON PIN 45= -55V ADF CONTROL HEAD WAS REPLACED TWICE DUE TO BURNED SMELL. BENCH TESTED ADF RECEIVER POWER SUPPLIES TO CONTROL HEAD, 200V AND -26V. FOUND BOTH OUT OF SPEC, 200V SUPPLY AT 285V AND -26V SUPPLY AT -55V. THIS CONFIRMS THE FAULT THAT THIS RECEIVER UNIT WAS CAUSING THE CONTROL HEAD DAMAGE. ON TROUBLESHOOTING OF THE RECEIVER POWER SUPPLY THAT THE +12 VOLT REGULATED SUPPLY FILTER CAP C512 AND C514 HAD FAILED CAUSING THE +12 VOLT SUPPLY TO APPEAR TO BE LOW AND THEREFORE CAUSING ALL OTHER SUPPLY OUTPUTS TO GO HIGH.