Laser printer fault and maintenance skills knowledge _ Hardware Maintenance

A Maintenance of no image in the front half of the printer's printed page

An HP Kserjei laser printer, on the printed page often appear in the first half of the image, the second half of the manuscript is printed in the first half of the original, but the image is normal, no deformation.

The failure phenomenon indicates that the paper is caused by the bad, and under normal circumstances, when the paper is rubbed to the top and bottom of the bit roll, the bit roll is not in the rotation state, but in a transient stop state, when the controller receives the position sensor output in the scanner orbit to the bit signal, the bit roll rotation, the paper is sent to the spinning of the photoconductor drum, And the speed of the paper and the photographic drum rotation of the line speed is equal, the front of the paper and the photographic drum on the front end of the image, and then transfer, fixing, that is, a copy of the same printed page with the original.

When the paper is sent in advance to the bit roll, if the speed of being sent out is equal to the line speed of the photoconductor drum, then the printed page is the first half blank, no image, the second half is the first half of the manuscript, and the image is normal, otherwise the image is distorted.

The reason for this is that there is a problem with the bit sensor or the controller, which checks the sensor on the frame next to the scanner track. Found a sensor problem, resulting in a bit of the roll in advance feed, replace the sensor after the trial printing, troubleshooting.

The scanner advances to the feed side can not return in situ an HP laser printer, in the continuous printing process, the scanner suddenly advance to the printer's paper side and can not return to the original, the printer issued "How do" the abnormal sound. The reason the scanner cannot return in situ is as follows:

(1) The return sensor has poor performance.
(2) Poor performance of the controller.
(3) Return to the sensor controller bad contact.
(4) The scanner drive system has mechanical faults.

According to the fault phenomenon, is in the continuous printing occurred suddenly, and accompanied by abnormal sound, it is suspected that the scanner drive system mechanical part of the fault.

Open the printer, with the hand back and forth to move the scanner, feel the movement is very difficult, under normal circumstances with the hand mobile scanner is very light, for this, the scanner back to the original, power on observation, panel display Normal, when the main motor began to rotate, the scanner also began to move forward. Exposure light is not bright, the scanner is moving in the process did not hear the abnormal "how do" sound, this "how Do" sound is more than the scanner into the end of the track with the rack collision issued. Under normal circumstances, when the printer preheating to a certain temperature, the spindle motor began to rotate, if the scanner in situ, then static; If the scanner is not in place, you should immediately return to the original position.

Open the printer and move the scanner back and forth with your hand found that all the chain is followed by rotation, and under normal circumstances, mobile scanner racks, only around the scanner-driven wire rope drum rotation, the chain is not rotating, which appears to be the drum and drive sprocket problems, they are the scanner drive parts, The sprocket is positioned on the inside of the drum wheel, and the driving shaft rotates to drive the drum wheel rotation under the action of the clutch. After this part of the demolition inspection, found that the wheel heart ball bearing wear serious, the drive shaft is milled out of a groove to kill the sprocket and drive shaft, so that when the sprocket starts to rotate, the drive shaft is driven, and the drum wheel rotates at the same time, driving the drum axle in one direction, causing the scanner to advance but not return the fault.

In order to completely eliminate the fault, replace the new clutch, the other parts in situ installed test machine, work back to normal, troubleshooting.

Two The printer does not respond when a print job is sent from the software

There is an HP laser printer, when the laser printer from the software to send print jobs, if the printer does not respond, the reason and check the elimination method is as follows:

(1) The power cable is not connected with the printer or power supply check the power supply and power connector, so that its connection is solid.
(2) The printer may suspend work, in hibernation with software recovery, wake the printer.
(3) The connection cable between the printer and the computer is not connected so that the connection cable between the printer and the computer is securely reconnected.
(4) The connection cable is defective: The cable can be tested on the normal machine, verify that there is no problem, if there is a defect in the experience, should replace the new cable.
(5) The printer selection menu for the wrong printer check software is selected to see if the correct printer is selected.
(6) Do not have the correct printer port configured, check the software configuration menu, ensure access to the correct printer port, if the computer is not a parallel port, you should ensure that the printer cable is connected to the correct port.
(7) The printer connection is not properly set on the converter, check the converter settings, you can connect the printer directly to the computer, you can verify that the converter has problems.
(8) Printer failure should be repaired.

Three Printed page full Color light

A laser printer, printed out the whole version of the page color light. Causes of this failure are:

(1) There is not enough toner in the toner cartridge. Check the toner cartridge, if you are close to use should replace the toner cartridge or add toner.
(2) sufficient toner, but the concentration of too light adjustment. Adjust the toner concentration, so that its shade suitable.
(3) The photosensitive strength of the drum is not enough. Re-adjust the photosensitive strength so that the photosensitive is sufficient.
(4) The working condition of the photosensitive drum heater is poor. Check the working status of the Photoconductor drum heater to ensure that it works well.
(5) High voltage electrode wire leakage, charging power down. Check the high voltage electrode wire is not connected with the fixed-phase leakage phenomenon, if it should be insulated treatment.
(6) Transfer of Corona device installation location has changed. Check the transfer Corona installation position is changed, if the change should be adjusted position, to ensure that the transfer voltage is sufficient.

Four Jam in the Output paper section

A Canon laser printer, whether printing large sheets or small sheets of paper, is jammed in the output paper. The paper tray is normal, just rub a piece of paper, and the lower carton will rub more than one paper.

Turn on the machine inspection, you can see a single sheet of paper smoothly through the paper parts of the two paper folder roller but the paper no longer advance, and the bottom of the paper tray in the paper parts of the front folder is jammed paper roll, and stopped at the place. The paper shows that there is a gap between the paper roller and the paper roller, and the paper can't get the friction between the paper roller and the paper roller. and lead to paper stop, the cause of this phenomenon, is due to the long-term appearance of paper jam, resulting in paper Parts folder paper roll frame on the spring deformation and loss of elasticity, resulting in paper folder roll clamping Force is not enough, Paper and paper roller can not produce friction, paper, although smoothly through the folder paper roller, but can not continue to advance.

Hand-Touch Folder paper Roller, has been loose deformation, will be the folder paper roller unloading, replacement of a new spring, loading complex, test machine printing, work back to normal, troubleshooting.