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2.Check the harness connection between fuser unit connector and eject sensor PCB ASSY 3. Replace the PS PCB unit 4.Replace the toner LED PCB ASSY 5.Replace the main PCB assy.
You can try to leave the machine power on for 10 minutes maybe this can clear the error. Or power on the machine while pressing the SW supporter,when the front cover is open and check that toner, DRUM and error LEDs light up, and then release the SW supporter. Check that all LEDs go off and press the SW supporter once,and then this problem maybe cleared by that press the SW supporter once again after all LEDs light up.
1. Turn the printer off, wait 10 minutes, and then turn the printer on. 2. If the message persists, reseat the fuser. If that does not work, replace the fuser. To check the fuser, turn the printer off and remove the fuser. Measure the resistance between the fuser connectors. If it is not within the proper range, replace the fuser. If there is not continuity between the fuser connectors neutral and hot with the fuser removed, replace the fuser. If the problem is not related to the fuser, replace the engine controller board.http://printertechs.com/tech/error-codes/error-codes-50-59.php
Fuser Ref: http://computer.howstuffworks.com/laser-printer3.htm
A 925 Fuser Error indicates that the wrong fuser lamp or the incorrect fuser assembly is installed.
If this error appears shortly after the fuser unit in the printer is replaced, put the old fuser unit back in. If the error message goes away with the old fuser unit, please check that the new fuser unit is the correct one for this printer model.
If the printer has not recently had its fuser replaced, plug the printer directly into a wall outlet. Surge protectors and power strips can sometimes regulate the voltage to a fault for the printer. If the printer is already on a wall outlet, plugging the printer into a different outlet may solve the problem. Keep in mind that there is no need to have the printer connected to a computer during testing for a fuser error as any pages to test the functionality of the printer can be processed internally.
If you have tried the printer on other wall outlets and the 925 Fuser Error still appears, the printer will require service to clear the message.
1) First thing is check power source. If you have the printer plugged into a UPS (uninterruptilbe power source) unplug it and plug it directly into the wall. If it is plugged into the wall you might want to try a different outlet to see if it solves the problem.
2) Remove and reinstall the fuser. It may not have seated properly.
#) Make sure you installed the correct fuser. Should be RM1-1082. There should be a sticker on the fuser with this number. See the following article for more info. http://www.partsnow.com/service_today/0705.asp
If you still have the old fuser check also that it is a RM1-1082. If not you may have a euro version machine which would require a different fuser.
If the fusers match up you should check the voltage coming to the fuser if possible. If there is 100- 127 volts where the fuser plugs in you probably got a bad fuser or it was damaged in transit. If there is low voltage or no voltage you may have a board problem. Probably DC controller or Power Supply.
To test fuser out of circuit make sure lamp and thermal fuse are not open circuit, and thermister is neither open or shorted
Fuser repair procedure from tec manual.
Fuser Failure (U4-1, U4-2, & U4-3)
1 Switch off printer main power. Remove the Fuser Full Cover so you can observe the Heat Rods. Switch on printer main power and observe the ends of the Fuser Assembly. The Heat Rods glow.?
| Go to step 5.
2 Replace the Printer Engine Controller PWB (REP 4.10.6). The error message reappears.
| Problem solved.
3 Replace the Fuser Assembly The error message reappears.
| Problem solved.
4 Check for a broken wire or a loose connection
5 Measure the AC voltage between J23-2 and J23-6 on the AC Driver PWB. There is 110VAC (or 220VAC if the printer is the 220VAC model) between J23-2 and J23-6.
| Go to step 7.
6 Replace the Fuser Assembly (REP 4.7.1). If the problem persists, replace the Printer Engine
Controller PWB (REP 4.10.6).
7 The Fuser cycles up and down.
| Replace the Printer Engine Controller PWB 8 Measure the voltage between P401-1 and P 401-4 when the Fuser Fan cycles up and down. There is 24VDC between P401-1 and P401-4 when the fan is rotating and 0VDC when the fan is off.?
| Replace the Printer Engine Controller PWB 9 Replace the AC Driver PWB
Please rate solution to your question "How can I check that new Fuser unit is ok?"
The way-off ohms reading would suggest the fuser element is bad. If the fuser is not heating, a sensor will tell the logic circuitry so, and thus your error, and no-print condition. I'm reasonably certain the self check at power on checks for fuser heating. Guessing here, but a heating check is likely done prior to a printjob being completed too.
If you can check the voltage at the fuser during the self check or as it readys to print, this would tell you if full voltage is applied. The 12 volts you are seeing probably is a standby voltage. The HP laserjets I've worked with all have higher heating voltages than this. You might be able to find some more accurate info elsewhere on the 'net.