Ricoh Aficio 450

[tcypy1961]

This Ricoh Aficio 450 is giving me light/negative image looking copies after the copier has been on for a minimum of ten minutes. I replaced the drum and LD Unit for this problem, but still it persists. These copies happen during copying, and even after the machine has just been sitting for about ten minutes, and then a copy is made. Any help on why the copies are this way would be most appreciated.

[slimslob]

Re: Ricoh Aficio 450

Sound like bad toner/developer. Charge properties have reversed polarity. Considering the age of the Aficio 450, I would say replace the machine. Ricoh no longer supports this model.

[Lagonda]

Re: Ricoh Aficio 450

Without seeing an example its hard to say but an educated guess says not enough toner is being supplied to the drum. I would suspect a problem with the dev unit such as the dev drive clutch slipping and the mag roller not turning. But given the age of this copier it could be anything that is starting to die from extreme old age.
This copier was a turkey when it was new and now 15 years later it would be an absolute shocker. Time to cut your losses and declare it unfixable.

[CrapAimer]

Re: Ricoh Aficio 450

I would check to see if the spring contacts are still there and the contact plate on the transfer unit

[bob marley]

Re: Ricoh Aficio 450

There may be a discontinuous connection between magnetic roller, front bias terminal and rear one on dv.unit