Heating element check Paper passes between the heating element and a soft pressure roller to fuse toner to the paper. 1 Unplug the product for at least ten minutes. Remove the right cover (page 113) and back cover (page 130). 2 Verify that the thermistor connector is seated into both the product chassis and the ECU. 3 Unplug the fuser cable connector (callout 1) by pressing and releasing the tab on the back of the connector. To measure the continuity of the heating element, measure the resistance between the two pins at the end of the cable. Note Normal resistance is 25 ohms +/- 10 ohms for the 110V product and 80 ohms +/- 20 ohms for the 220V product.
If no resistance is measured, replace the fuser. 4 Remove the thermistor connector (callout 2), and measure the resistance between J206 pins one and two and between J206 pins three and four. Note Normal resistance between both pairs of pins is 370K ohms +/- 50K ohms at 20° C (68° F). 5 If no resistance is measured, replace the fuser. 2 1 2 2 Figure 95. Locating connectors for the heating element check EN Functional checks 203