Q1342-90910 Functional checks 83
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.
Figure 54. Locate the connectors for the heating element check
2
2
1
2
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