Fault phenomenon:
This unit has a HP LaserJet 6L laser printer. A phenomenon has recently occurring very much noise in booting and printing.
Removal process:
First open the front panel and take the toner cartridge. Drease the front panel (note: The axis on the left can be put in, but the right side is not allowed). The screws in front of the middle panel are removed (one of the left and right). Remove the three screws of the rear panel. At this time, remove the rear panel (note: the blackener on the rear panel must pull up, otherwise it can not take the rear panel). Finally, remove the middle panel (note that there is a card in front of the front side of this panel).
Patient analysis and resolution:
After opening the power, see where such a big voice. Press the down switch and there is no reaction. After carefully observed, there is also a switch on the upper side, and it is automatically opened when the drum is installed. At this time, I also pressed the two switches at the same time, the printer was powered, and a terrible sound was issued. It is obvious that the above metal sheet is emitted. I carefully open the above screws. I found that there are not many things, only a small mirror of a circuit board and activity. It is found that the sound is more than the test. Doubt screws, vibration of metal sheets. Re-put the metal sheet, tighten the screw. But the problem is still.
What is the reason?
Required, finally found that this mirror is rotated at high speed, in addition to normal sounds, it seems that there is a little noise (high frequency), the metal piece is magnified, it is very rang (interesting is this metal piece very Thin to this frequency of noise is enlarged. After removing the metal sheet, it is not very serious listening, it is difficult to find high frequency noise). Remove the kicks above the small mirror with the mirror, find that the following is a small motor. It is very likely because the small motor has less oil, like a fan on the computer CPU, it is possible to add some oil when it is. Finally, I got a high-grade lubricant, but I can't add it, because there is a big inertial wheel above the motor, there is no way, dismantling the circuit board with the motor, plus oil. Pack, power up, exciting things happen, the printer issued a normal sound. Printing the passing page did not hear the terrible sound.
Related fault analysis and resolution:
It seems to solve the problem. But look at the words and printed words, frightened. what happened? ? It turns out that each word is like a drink, all of which is twisted. Why is so scared? The last time is because this problem has spent a lot of money. I checked my maintenance record and found the most suspicious place to move the board. Because slightly deviations may cause the laser beam to deviate from the original route, this will eventually happen. Looking at it carefully, fixed this circuit board is three screws to form a triangle, which can be said that the level of the mirror is adjusted by these three screws. This has been adjusted to correct these three screws to make it level. Although I said, but I'm not so simple. After a constant debugging, I finally succeeded that the printed word is almost as clear as the new purchase.
