TM 10-6640-239-13 3-9 Table 3-2.  Troubleshooting - continued MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION If exhaust blower(s) still does not operate, notify unit maintenance. 28. UNINTERRUPTED POWER SUPPLY FAILS TO OPERATE. Step 1.    Check that unit’s power cord is plugged into convenience outlet for uninterrupted power supply. Step 2.    Check that line switch is ON. Step 3.    Check and reset MAIN POWER PANEL circuit breaker A1CB3. If computer fails to operate, notify unit maintenance. 29. COMPUTER FAILS TO OPERATE. Step 1.    Check that unit’s power cord is plugged into uninterrupted power supply. Step 2.    Check that line switch is ON. Step 3.    Check and reset MAIN POWER PANEL circuit breaker A1CB3. If computer fails to operate, notify unit maintenance. 30. LABORATORY OVEN FAILS TO OPERATE, DOES NOT HEAT. Step 1.    Ensure that unit’s power cord is plugged into convenience outlet. Step 2.    Check position of temperature control dial. Rotate clockwise to increase temperature. Step 3.    Check and reset MAIN POWER PANEL circuit breaker A1CB4. If oven still fails to operate, notify unit maintenance. 31. KINEMATIC VISCOSITY BATH DOES NOT OPERATE. Step 1.    Check that unit’s power cord is plugged into convenience outlet for viscosity bath. Step 2.    Check that power switch is depressed. Step 3.    Check and reset MAIN POWER PANEL circuit breaker A1CB5. If bath still fails to operate, notify unit maintenance. 32. REFRIGERATOR FAILS TO OPERATE. Step 1.    Ensure that unit’s power cord is plugged into convenience outlet. Step 2.    Check and reset MAIN POWER PANEL circuit breaker A1CB6. If refrigerator still fails to operate, notify unit maintenance. 33. DISTILLATION TEST APPARATUS FAILS TO OPERATE. Step 1.    Ensure that unit’s power cord is plugged into convenience outlet.