C450 funny/challenging colour problem

[AVW]

Hi Forum,

The last few days my C450 is doing interresting printouts. Whenever I print a 4c document the first page gets an complete magenta background added (plus some magenta spots inside images), and the 2nd duplex page is 100% ok. That goes on for every following print. So half of my brochures are with magenta stripes (about 25% magenta, complete sheet but one can see stripes paralell to the drums, image transfer belt, etc. means "normal" to the moving direction of the paper.

It is really crazy as every 2nd page (the duplex sides) are 100% ok.

What I did so far:

• Changed the toner cartridge (for the case the toner is "faulty" or the opening mechanism is broken or anything).
• cleaned the magenta toner place, the outer side of the drum, the space around the LPH with vacuum cleaner.
• cleaned the LPH with IPA
• installed a new wasttoner bottle
• changed the magenta drum to a well working one (tested)
• cleaned the transfer belt with IPA
• later installed a brand new transfer belt
• had a look at the paper paths if there are foreign objects
• checked if the image transfer roll (and everythign else inside the right door) look ok
• changed the sending computer to see if there is perhaps some strange driver issue

but it stays always the same 1st side is 25 % magenta background, 2nd side is perfectly without issues.

Any ideas?

[blackcat4866]

This doesn't sound like a supply problem or it would affect both sides. It sounds like an image processing problem, MFPB. Keep in mind that this machine is quite elderly. How much are you going to spend to fix it?
=^..^=

[AVW]

This doesn't sound like a supply problem or it would affect both sides.
That´s what I thought as well.


It sounds like an image processing problem, MFPB. So you are suspecting the MFP Control Board? Anything I can do to verify? Any advice what else I should or could try?


Keep in mind that this machine is quite elderly. How much are you going to spend to fix it?
=^..^= I will keep it as long as possible. I have tons of supplys plus 60 toners around. And also you get these machines for 200 bucks used here in Europe at the moment. In worst case I will switch to the C350 that is as well around, for the moment. Later I could get another C450, well working or for spare parts.

[allan]

Strip clean reassemble...
Especially ribbon cables and HV contacts.