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Explanation of inner workings HP4500 problem

Posted on 2004-04-08
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Last Modified: 2010-04-12
Hi,

Easy question i think,

I have an HP 4500DN and I have just replaced the transfer kit. When I started printing half the page(left half) is coming out all dimmed and in some places  missing altogether.

When I took the transfer kit out again, there was half the page (the ink anyway) on the transfer belt, if I wipe the transfer belt clean, it just does it again? any ideas? and could someone explain the paper path through the print as I thought the paper went through the transfer kit 'before' having toner;

So to summarize, if you could put these in order for me and maybe give me some clues to look for in solving my problem:

Transfer Kit
Image Drum
Laser
Toner x 4
Fuser

Thanks
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Question by:bhermer
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briancassin earned 250 total points
ID: 10788693
these will explain the printing process

http://computer.howstuffworks.com/laser-printer.htm

http://www.vista-net.com/laser_printers_1.htm

Sounds like the toner is not being charged by the primary corona wire. A magnetic charge is placed on the paper and on the toner cartridge. This paper that you are getting out does the print wipe off ? if it does could also be a fuser assembly problem.

Sounds like the transfer kit is not working properly

Make sure the printer is plugged directly into the wall no surge protectors, no power strips.
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by:briancassin
ID: 10788700
Make sure the wire in the kit is not damaged if you touched the wire during install wipe it down but be very careful these wires break very easy.
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Expert Comment

by:wyliecoyoteuk
ID: 10798128
Sounds like the paper is not touching the transfer belt all the way across, the unit is probably installed incorrectly, or it could be faulty. The suggested charge wire fault would not leave an image on the transfer unit.

Some 4 colour printers build up the image on a transfer belt, then it is transferred to the paper from there, by means of a charge behind the paper.

the order is this:
toner is put onto drum,1 colour at a time
toner is transferred from drum to transfer belt, 1 colour at a time,
every 4 colours,
toner is transferred from belt to paper, all 4 colours at once, giving a full image on paper
toner is then melted onto paper by fuser.

look here:
http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?locale=en_US&taskId=110&prodSeriesId=25505&prodTypeId=18972&objectID=bpl07375

apparently, it is possible to install one of the rollers back-to-front.
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by:bhermer
ID: 10811343
Thak you all for your comments, I will try some of these ideas today and award points later
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