Question about Gestetner C7435n Laser Printer

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Lines on paper

I have a Gestetner C7521C and want to know if it might be the roller bar or something else.

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Its from your roller bar from toner build up. You need a special paper that's designed to clean your rollers off. That's the easier and quicker fix.

To clean up a laser printer that's leaving lines on paper do the following and should you get stuck post to us on for some assistance.

Digging into the guts of your machine would clean it up too if you know how or are handy this way. And, maybe the only way if you've printed a lot of sheets and the inside of your printer is filled with toner dust. The dust comes off the paper itself and just gets inside and starts to blow around until you see what you're seeing. The good lasers are expensive and I take them in for annual servicing all the time.

Two things to be aware of though, you will want to do this outside or in a garage on a plastic sheet and wear gloves. The toner is static sensitive by design and it gets everywhere. You'll want a small vacuum with a clean bag you'll trash later, canned air, a 3/4 inch natural bristle (less than a buck type) paint brush and some lint free rags. All these things you'll have to dump when done as you'll get them saturated with toner and its best to trash them when done. I use an old Orek cannister vacuum outside and no bag to get better suction and the hose can be swapped easily on this vacuum with the exhaust to blow instead of going through cans of air.

Remove your toner cartridge carefully and place it in a bag and place it well aside.

Disassemble the unit in a layout order that will help you reassemble it later.

As you take each component out blow it off in an area away from disassembly area and downwind. Look for areas you can clean out further with your disposable brushes and then blow that area out too.

When you get to the rollers and have done the above sequence put a clean brush in alcohol and wipe down the rollers until they're clean. Once the rollers are done, you'll need another clean brush and soak the rollers down with clean water. The alcohol shrinks the rubber compound and the water will rehydrate them. This is pretty important as a roller that has shrunk from dry humid climate or cleaning the rollers will start to slip or worse one side will and the other won't and you'll have a paper jam.

Go through your entire unit this way and on reassembly you may want to look the gears over and see if the white lithium is pretty dark, if so clean those off by wiping and add new white lithium to them.

Be pretty careful putting the toner into place and make certain it is latched.

Once the unit is clean and reassembled just plug the unit it while your still in your clean up area and power on and then off. Do this a couple of times so the gearing seats itself. When you energize a printer fully, it goes through a power on self check, that will fail if you don't power on/off quickly a few times for the gears to seat themselves. Then let the system energize completely. You may get an error message, don't be too surprised, just look it up and see what needs to be done about it.

Once it energizes and powers up with no error messages other than you're not connected to a computer start feeding sheets out the printer until they come out clean.

You should be good to go at this point. With your computer off, connect to your computer and power up. If you have any trouble post your problem here at


Posted on Jun 27, 2008


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