Heating-element check Paper passes between the heating element and a soft pressure roller to fuse toner to the paper. 1 Unplug the printer for at least ten minutes. 2 Remove the heating element connector (callout 1) from the ECU. 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 110 V printer and 80 ohms +/- 20 ohms for the 220 V printer. If no resistance is measured, replace the fuser. 3 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 370 K ohms +/- 50 K ohms at 20° C (68° F). 4 If no resistance is measured, replace the fuser. 5 Reconnect the heating element and thermistor. Verify that the connectors are seated into both the printer chassis and the ECU. 2 1 2 2 Figure 54. Locate the connectors for the heating element check Q1342-90910 Functional checks 83