4-72 WorkCentre C2424 Service ManualMeasuring AC Power Supply VoltagesAC line voltages are present on the power supply and possibly in the system, via theheaters, while the system is plugged into an AC outlet. The power switch is detectedby software and proper shut down is followed by a power off signal to the powersupply. The system may be operating for a considerable time after the switch is turnedoff.1. Power off the system and try a different outlet.2. Turn off the system, wait for shutdown, and unplug it from the power outlet.3. AC Input: With a DMM set to measure AC voltages, measure the power beingsupplied to the system; it should measure between 90 to 140 VAC (115 VACnominal) or 180 to 264 VAC (220 VAC nominal).4. Proceed to the step, “Testing Motor and Solenoid Resistances” below.5. If a heater shorts, F2 or F3 opens. The power supply does NOT shut down;however, a Service Required error code is displayed on the control panel.Detecting condition of Fuse F2 and F31. The drum and preheater connect to F2.2. The printhead and ink loader connect to F3.3. Turn the power switch off and wait for the system to shut down.4. Unplug the power cord.5. Remove the Ink loader Assembly and Door as specified on page 8-13.6. From the back of the system you will see one heater cable connector on the leftnear the power switch and two under the ink loader.7. Place the power switch in the ON position and make the followingmeasurements:a. Using an ohmmeter, measure the resistance between the lowest pin on theleft side, just above the power switch, and the lowest pin on the AC inputconnector. If the meter measures 0 ohms, F3 has not been damaged.b. Measure between the right most pin under the ink loader and (again) thelowest pin on the AC input connector. If the meter measures 0 ohms, F2 hasnot been damaged.8. The heater triacs are not accessible for measurement and are disconnected fromloads if the switch is off or the system is powered down.9. Replace the Inkloader Assembly and Door following the test.
