HP 2500 Service Manual - Page 209
Heating element check, High-voltage power-supply check, To check the print cartridge connection points
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Note Note Note Heating element check Media passes between the heating element and a soft pressure roller to fuse the toner to the media. 1 Unplug the printer for at least ten minutes. 2 Verify that the thermistor connector is seated into both the printer chassis and the low- voltage power supply. 3 Remove the heating element connector (callout 1) from the low-voltage power supply. To measure the continuity of the heating element, measure the resistance between the two pins at the end of the cable. Normal resistance is 25 ohms +/- 10 ohms for the 110 V printer and 80 ohms +/- 20 ohms for the 220 V printer. 4 If no resistance is measured, replace the fuser (see page 92). 5 Remove the thermistor connector (callout 2), and measure the resistance between J206 pins one and two and between J206 pins three and four. Normal resistance between both pairs of pins is 370K ohms +/- 50K ohms at 20° C (68° F). 6 If no resistance is measured, replace the fuser. High-voltage power-supply check The high-voltage power-supply PCA provides the necessary voltages for the electrophotographic processes. To check the print cartridge connection points Turn the print cartridge over and visually inspect the two connection points on the ends of the print cartridge. If they are dirty or corroded, clean the connections. If they are damaged, replace the print cartridge. Use only isopropyl alcohol to clean the connections. Figure 110. Print cartridge high-voltage connection points EN 6 Troubleshooting 207