Question about HP LaserJet 4L Printer
1. Remove power to the printer for 15 minutes. If this doesn’t clear the error:
2. Perform the Fuser Checks shown in the table below.
3. Check the Fuses (FU101 and FU201) on the DC Controller PCA. Replace if faulty.
3. Replace the DC Controller PCA.
Contact Ensure that J103 and J204 connectors on the Fusing Assembly are seated securely into the DC Controller PCA connectors. Reseat the Fusing Assembly,
2. Thermistor wire open.
Remove the Fuser and measure the resistance between connectors J204-1 and J204-2, Resistance
should read approximately 440 K Ohms at 20 Deg C (room temperature). If the thermistor wire is open, replace the Fusing Assembly.
3. Thermal Fuse.
Measure the continuity between connectors JI 03-1 and J1 03-2 on the Fuser. It should be approximately 29 Ohms. If the thermal fuse is open, replace the Fusing Assembly
Posted on Sep 11, 2009
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Posted on Jan 02, 2017
Please see this thread, and the link within it.
However, there are other posts that indicate this error could be temporary and suggest possible workarounds. See here and here.
For the complete list of error codes for that machine, see here. If you need manuals or other resources for that printer, see the home support page here.
I hope this information allows you to resolve this issue. If you need further assistance, please post back with a comment to this thread.
If I've managed to answer your question or solve a problem, please take just a moment to rate this post....thanks!
Posted on Aug 26, 2009
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Please try below solution.
ERROR 50 - Service
A 50 service error can be either a temporary error or a permanent problem requiring service.
Temporary Error: Power off for 20 minutes to allow the capacitor on the DC controller to fully discharge. If you don't allow this capacitor to discharge, you will still get a Error 50 even if you have fixed the problem. This may clear the error - either temporarily or permanently. If it clears the error it was most likely caused by a low power problem i.e. low line voltage causing the power supply circuits to drop out of regulation. Low/unstable power (low line voltage, brownout condition). If it doesn't clear the error you may have one of the problems listed below
On the HP LaserJet 4L/4ML, errors are indicated by a series of indicator lights. This printer has four lights, Paper Jam, Paper Out, Data, and Online.
If all four lights are on, press and hold the blue panel button to display a secondary light pattern.
An error 50 is indicated by the ready and error lights with the blue panel button pressed.
Turn the printer off for 15 minutes to see if the error clears. If not, you will need to remove the fuser assembly to perform further checks. This requires removal of the cover, an unpleasant task, and measurement of the fuser terminals.
Note: THERE ARE FURTHER STEPS TO CHECK THE ISSUE, HOWEVER IT IS NOT RECOMMENED TO CHECK USING YOU ARE A USER, FURTHER STEPS NEED TO BE DONE ONLY IF YOU ARE COMFORTABLE AND INVOLVES MECHNICAL ISSUES OF PRINTER.
For your convienience, I will would like to provide the web link that shows the picture of the scene
try the things that are mentioned in web link. If the issue persists, then Printer needs to serviced.
I hope that this should resolve the issue for you.
If you need any further assistance, please let me know. I'll be glad to help you.
Oct 18, 2007 | HP LaserJet 4 plus Printer
Nov 20, 2006 | HP LaserJet 4 plus Printer
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