HP LaserJet 3200 Service Manual - Page 170

Note Note Heating element check Paper passes between the heating element and a soft pressure roller to fuse toner to the paper. To verify that the heating element is functioning correctly: 1 Unplug the product for at least ten minutes. 2 Verify that the thermistor connector is seated into both the printer chassis and the ECU (see figure 49 on page 121). 3 Remove the heating element connector from the ECU (see figure 50 on page 122). To measure the continuity of the heating element, measure the resistance between the two pins at the end of the cable. Normal resistance is 30 ohms +/- 10 ohms. 4 If no resistance is measured, replace the heating element. 5 Remove the thermistor connector (see figure 49 on page 121) and measure the resistance between pins one and two. Normal resistance is 440K ohms +/- 30K ohms at 68° F (20° C). 6 If no resistance is measured, replace the heating element. Paper curl Paper curl is inherent to the laser printing processes, and occurs when paper is subjected to heat. Paper curl tends to relax as the paper cools while resting on a flat surface. The specification for maximum paper curl when the paper is lying flat before print is 5 mm (0.2 inches). 168 Chapter 6 - Troubleshooting EN