Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems.

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Default (HP LJ 3300 multifunctiom) laser Printer has a problems (black dots)

Hi All
my laser multifunctionm machine
has a problem showing black or grey dots even on
all-white prints, to see what I mean see this link
it has a descriptive picture of a sample print page:
a href=


is it a toner-cartridge problem or does it need cleaning
does any body know where i can get disassembly instructions
of my machine ( I opened the scanner unit and cleaned it
successfully and fixed a black/yellow-lines problem with
copying/scanning) so you can say I'm comfortable using a screw driver
and repairing things at my own risk)
what I'm looking for is instructions how to open/disassemble
the printing unit i think maybe if I do some cleaning it
will fix the "dots" problem shown in the link above,

has anyone had similar problem with any laser printer
I appreciate your thoughts and suggestions!

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I don't know this exact printer but I just had a Personal LaserWriter
300 in for repair. It uses the Canon engine and was making simular dots
spaced regularly. By stopping the print in the middle of a cycle I was
able to examine the drum in the cartridge. It was damaged in exactly
the shape of the repeating dots. The damage was very severe and needed
a new cartridge.
The guy said his son switched the output while it was outputting. He
then used a knife to remove the jammed paper bits!


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