Two cases of laser printer without handwriting fault maintenance _ Hardware Maintenance

Two cases of laser printer fault maintenance

Failure phenomenon One:

An HP HP LaserJet 1010 Laser printer used for a period of time, when online printing, the paper is normal, but print without handwriting.

Analysis and Maintenance:

We know that HP HP LaserJet 1010 Laser printer is currently a unique use of HP instantaneous fuser technology, up to ppm (A4, letter) printing speed, application of HP resolution enhancement (RET), resolution of up to DPI, monthly print load up to 5, 000 page, 8 MB Ram main product, in today's party and party, large and medium-sized enterprises and institutions, financial and securities services and other fields are accounted for a certain proportion.

The following, the author according to the fault phenomenon, first from the computer and its peripherals (such as print cable, printer connection card, power outlets, etc.) hardware to check whether the normal, if not abnormal, you can initially eliminate the computer and peripherals hardware failure, it is determined to be the HP laser printer itself fault. There are no printed handwriting, which can be ruled out in accordance with the following steps:

1, first replace the new powder box to see if the failure disappeared. The replacement should first check whether the Toner seal is pulled out, toner has been used up. If the seal is not pulled out or the toner has been used up, will result in no phenomenon of handwriting, but if the toner cartridge is used up the fault phenomenon is the output-like Zhang Xian is the longitudinal middle part of the gradual fade, red display lights flashing alarms, prompting the machine inside the toner cartridge is about to run out of toner. The phenomenon of printed handwriting is very rare, and must be in the image after a long period of time, so the basic elimination of powder box without toner reasons.

2, then check the HP Laser printer cartridge is faulty. Careful inspection found that the toner cartridge on the surface of the ink traces, it is determined that there is no fault printer development parts, the problem is in the handwriting from the drum to the paper transfer stage.

3. Finally check the electrode wire on the transfer electrode assembly, found that the electrode wire did not fuse off, but in the electrode wire before and after the attachment of a large number of black powder leakage, so that the fault from a large number of charged leakage of the electrode wire can not occur normal corona discharge, or corona discharge voltage is too low, Can not be negatively-charged developer toner adsorption on the paper, resulting in no handwriting on the printed page phenomenon.

The solution is to use a small group of clean cotton dipped in a small amount of methyl ethyl ketone, in the shutdown state gently wipe, remove the transfer electrode assembly on the electrode wire around the toner. After cleaning up, and then with a small group of cotton dip into a small amount of anhydrous alcohol to wipe again, such as alcohol volatile clean, reinstall in place. On use, the printed text is normal and the fault is ruled out.

Failure phenomenon Two:

A Epson Epson Laser printer, after the boot of its own detection time obviously lengthened, after the display of "MOB5", Green led all off, online do not print.

Analysis and Maintenance:

The power self-test operation shows that the mechanical part of the laser printer is basically normal. After the power off, turn on the chassis to check the toner cartridge, toner, no abnormalities. Based on the fault of the long running time, the initial judgment may be related to the paper Road fault. Because the hand does not have this machine ready-made circuit diagram and related information, can only rely on the previous maintenance experience one by one to check the laser printer physical map, each check found that the machine has only a circuit sensor, removed the sensor with the multimeter measurement, found that the sensor action and no action when the resistance value is extremely unstable, This determines that the sensor is the cause of the printer is not working properly.

As the market is difficult to buy this type of sensors, can only be repaired. Carefully disassemble the sensor, found that its internal action contact parts due to excessive use of time has been seriously oxidized to appear green patina. First with a tool knife carefully scraping surface oxide layer, and then poured a little water alcohol repeatedly cleaned several times, after taking out with the hair dryer low-temperature drying, and then the original assembly in place (because of its volume only a few millimeters, assembly process to be very cautious, so as not to damage the hook and lost spring). Finally, the sensor is loaded into the laser printer to reboot the test run, online printing normal, troubleshooting.