Troubleshooting Guide
Contents
1. mode press any key Door Open Message Instrument door not properly closed Faulty interlock system Condition Possible Cause Furnace Open Message Furnace door not properly installed Faulty solenoid Keyboard Inoperative Loose cable connection to controller board Faulty controller board Thermocouple Error Furnace not heating Improperly installed thermocouple Faulty connector Faulty thermocouple Thermocouple not properly calibrated Improper line voltage Line voltage switch improperly positioned Overloaded furnace Faulty controller board Internal Blower Assembly Inoperative Faulty blower Improper setting in setup procedures Furnace Fails to Preheat Within 1 Hour Excessive moisture in furnace Perform furnace power measurement and if necessary microwave power measurement Verify line voltage 892. 88 Troubleshooting Guide Condition Possible Cause Instrument Inoperative Instrument not plugged into electrical outlet Power switch not in on position Blown fuse Loose connection to power switch Faulty power switch Faulty DC power supply No Furnace Heating No Microwave Power Instrument door ajar Heating blocks not installed Interlock s not properly adjusted or faulty Faulty controller board Faulty thermal switch Faulty high voltage component Low Furnace Heating Low Microwave Power Low line voltage Incorrect voltage switch setting Faulty high voltage component Fuse Blows When Door is Opened Interlock s not properly adjusted or faulty Fuse Blows Repeatedly During Operation Low line voltage Faulty high voltage component Faulty DC power supply Faulty controller board Faulty afterburner No Display Loose or broken wiring connections Loose or faulty interface cable Faulty display Faulty controller board Inoperative Keyboard Loose or faulty interface cable Faulty keyboard Faulty controller board Microwave Leakage Improperly adjusted instrument door Damaged instrument door RF stub not installed or improperly aligned Erratic Temperature Loose thermocouple Incorrect A D setting Faulty controller board Smoke in Laboratory Restricted exhaust tubing Internal blower not operating Blank Display Faulty display Instrument in stand by
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