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Troubleshooting and Correcting Power Problems

Author: Reference Number: AA-02643 Views: 9629 Created: 02-10-2011 10:56 am Last Updated: 07-20-2011 10:08 am 0 Rating/ Voters

                                                                                            Troubleshooting and Correcting Power Problems



      Laser printer’s operate within a range of input AC voltages. Usually between 110 to 127 volts(+/- 10%) in the U.S.  Which is a wide range to operate in. These are the specifications that are set by the manufacturer’s. Seems like there would be a lot of problems/issues with printer’s that were constantly operating at the low or high end of this range. Fusers not heating up or getting to hot,scanner bulbs not getting up to temperature,power supplies unable to output the required voltages. Eventually taking its toll on the various components in the printer such as the fuser, power supply, DC controller and other logic boards.  The surges, sags (low voltage), lightning strikes and the noise that is created from outside sources eventually will have some effect on the printer if not right away, at some point in the future. Most power companies will recommend that you install some type of power conditioner or surge protector, not just a power strip with a circuit breaker. A power strip is just a means to plug more devices into the same wall outlet and does not provide any real protection from bad power. Intermittent failures are the most troublesome to diagnose and repair. Factors within the office environment such as the microwave being used,a paper shredder or even an elevator being used will have an effect on the power to the rest of the building. There are a few companies out there making quality surge suppressors, noise filters and power conditioners which will help to clean up the power being provided which in turn will save  components from certain demise. Which in turn will save money in the reduced amount of parts being replaced and the cost of the service call required to do the repair.


     Some but not all problems show up in the fusing process when printing media other than standard paper, such as envelopes. As the case with the 4200 series printer. Envelopes start smearing and ghosting, nothing has changed still using the same envelope stock and toner cartridge. The printer settings have been checked as well. Some different fuser temperature/settings are tried, possibly getting some better output, still not acceptable. Envelopes are tried in another printer and work fine. An OEM fuser is installed, still smearing and ghosting continues. In this case the power supply is the problem, unable to supply enough voltage to bring the fuser up the proper temperature, but not generating any error codes.


     The HP color 3600 series printer stuck in calibrating, sometimes for hours. Replacing toner(s) and transfer belt makes no difference. In this case 54.XX errors are generated on the event log. Disabling cartridge check on the menu will get you past the calibration process temporarily. The most likely cause is the HVPS PCB, unable to output enough transfer and charge voltages for the transfer belt. The printer is unable to complete the calibration proccess,as it cannot pass its own internal test of the color densities.


      The HP 5SI,8000,8100 and 8150 models can also have fusing issues caused by the LVPS. Toner will start to build up on the upper and then lower fuser and pressure rollers. Smearing and shadowing or ghosting will start to occur. Replacing the fuser will of course correct your problem, but only temporarily. The fuser will start to accumulate toner again if unable to get to the proper operating temperature. The LVPS is on the way out and will need to be replaced. Another symptom on these models is a re-occurring intermittant 50.2 fuser error, even after replacing the fuser assy.


       The HP 4100/4101 MFP printer has no lights or display on the control panel. You might think the panel itself is the problem. Replacing it has no effect, still no display.  The problem is with the flatbed scanner power supply. The printer engine will power up and come ready. The engine is able to print self test pages  when the test  button is depressed. The flatbed scanner power supply will need to be replaced.


     The HP CP 3505 color printer when printing envelopes from tray 1 when coming out of sleep mode can generate a 50.2 fuser error. If printing plain paper from tray 1 the error does not ocurr. So after the standard fuser replacement, then the LVPS, the error is still happening only on envelopes. In this case the DC controller firmware is at fault and needs to be upgraded. The signal from the DC controller to the LVPS is not generated in time to heat the fuser up to the proper temperature for envelope printing.