Hi friends!
Today we are going to see an easy repair of a laser printer that is giving printing problems
A few days ago I commented on twitter that I was involved with a job, with a circuit, or rather: With the layout of a circuit that I made...
...a while ago, it is the regulator of A.C. for 220/125 volts
and that can govern almost 4KW, about 3800 watts, is this device
the circuit is quite smaller than this that you are seeing, it is inside
This device is a compact unit: With its switch, input and output current, regulator, fuse and box (the tupper)
this circuit has given me problems: After mounted, it did not work, for a stupid mistake of mine
One thing is clear: This will only upload to YouTube if it works, verified by me
also, the laser printer with which I make the layouts has started to give me some problems. In this video we will solve it.
here we have a printed layout (it is at low resolution). We see at the beginning of the document a small spot
A little further down, the stain is reprinted and comes to fall squarely on a track, weakening it
even lower down the stain returns, and falls into a copper zone. On this occasion, functionally it does not matter, but aesthetically, and this is not acceptable
the stain is still reproduced a fourth time below and almost at the end of the paper
in this other document we have the same spots, and depending on the position of the drum, the spots can change its location
here we have the first spot, to the left of the screwdriver
now, instead of falling the spot on the track, it has fallen a little lower, this time there is no functional problem, but aesthetically
the third spot falls here, and this can create a small unwanted copper island in the process of etching. In short, the layout will not come out with the desired quality.
we see that the stains are not produced randomly but at a constant and regular distance, therefore, it is possible to think of some kind of rotating mechanism, and that mechanisms is the image drum, all laser printers have one
In the drum is where the image is generated electronically. This drum will attract toner through electric charges
The repair will consist of, with great care, cleaning that image drum. Let's go there...
This is the printer, we are going to extract the image drum
what you are going to see next can change from one printer model to another, but basically it will be the same in all models
First of all: Printer off
we raise the cover, in this case there is a scanner, and now we raise the true cover
and we are, first, with the toner, which has nothing to do with this repair. We extract it by simply pulling it and leaving it on a clean surface
behind the toner appears the image drum unit, which also comes out as a compact unit pulling on it using this handle
I will also leave it on a clean surface, like a new sheet of paper
here you have the image drum unit, as I said, I put it on a clean surface, a sheet of paper
we need cotton swabs
and alcohol, but this time I recommend you use the isopropyl type, not the pharmacy. Although this bottle costs a little expensive, keep in mind that it is a liter and not 250cc, so in the end it is not so expensive.
we are going to lift this plastic tab to leave the drum in sight that is that green roller
we will leave this plastic tab in position "parked" to access the drum
we impregnate the stick with alcohol and we will rub it all over the drum, cleaning it
Wow, I cleaned it two days ago, and I see that I'll have to clean it again ...
we are removing the stains ...
the image drum is very delicate. We should not touch it with our hands. If that happens, we will clean it with the stick to eliminate fat marks
the image drum must be clean like a mirror
Do not even think about using your nails or even worse: A tool. In that case the drum will be unusable and it will have to be replaced whole
once we have cleaned a sector of the drum, to access the rest of the drum, we will turn it, but not pushing it directly, but using the gear that is always in either end
There will come a time when a spot will appear that will be responsible for our documents to be printed stained
to me, that spot appeared more or less at this height, fully compatible with the stains that came out in all documents
notice that the stains on the image drum can be very embedded, hardened: Insist with the stick, but do not fall into the temptation to use the nail or tools. The stain, in the end, comes out
It took me so much work to remove the stain that I came to think it was a physical defect (scratch) in the image drum. But in the end, the stain came out.
By the way, the stain that was causing me problems I can not show you because I already removed it in the real repair, this is just a "simulacrum" to make this video.
once we have finished cleaning the image drum ...
we left this plastic tab as it was
I recommend waiting a few minutes before replacing the imaging drum so that the possible remaining alcohol evaporates
we already know that alcohol evaporates quickly, but if, for whatever reason, we operate the printer with the image drum impregnated with alcohol, we can inflame it because the laser printer works at very high temperatures
We let a few minutes pass, and we put everything back into the printer
we are going to place the image drum and the toner
The truth, placing this is very easy. Almost what could be done with the eyes closed. Despite the complexity and precision of the mechanism, placing drum and toner is very easy and intuitive
You hear a "click", OK, now we go with the toner
I insist: It is very easy to remove / put these pieces in the printer, impossible to be wrong
we close the printer...
I turn it on and I'm going to print a test page ...
I will print the same layout
initializing ...
Ready... I send the layout to the printer...
here we have the layout (at low resolution)
without the slightest defect. The stain has disappeared
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