HP 1200 Service Manual - Page 154

Heating element check, Locating connectors for the heating element check

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Note Note 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 Verify that the thermistor connector is seated into both the printer chassis and the ECU. 3 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. Normal resistance is 25 ohms +/- 10 ohms for the 110V printer and 80 ohms +/- 20 ohms for the 220V printer. 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. 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. 21 Figure 74. 2 Locating connectors for the heating element check 152 Chapter 6 - Troubleshooting EN

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152
Chapter 6 - Troubleshooting
EN
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
Verify that the thermistor connector is seated into both the printer
chassis and the ECU.
3
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 110V printer and 80
ohms +/- 20 ohms for the 220V printer.
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.
Figure 74.
Locating connectors for the heating element check
2
2
1
2