Inspection is required 990 error - MICROLINE OKI Office Equipment & Supplies

SC-990 - Communication problem between BICU and input output board or software performance error.

I would suggest contacting Ricoh customer service.

This error is related to the rear cooling fan.
Physical inspection required, if not capable of doing it yourself please call a certified technician.

Could we have the make and model, so that we can help. Thanks.

Error 990 refers to the toner capture sensor unit, that black knob looking thing on the toner cartridge itself. I'm betting the error popped up right after changing the toner cartridge?..... therefore, it's a defective toner cartridge.

Error 990 indicates a dirty sensor, so either a maintenance unit is dirty or you have a clogged print head. You can read more about this error on Richo website where you can see in the images what you need to clean.

Hi,
Error 990 means the problem is with the scanning unit which is basically called a laser unit as well that requires a replacement.
Thanks and regards,
Anil.B.R

This is an error that has to do with the ink drying up on the maintenance unit. This cannot be fixed by the end user and must be fixed by Ricoh. Error 990 is a Ricoh defect in which the printer should qualify for replacement.

Error code 990 indicates software problems yuo can check in SP7-403 for information.
Error code 540 will proberly indicate some heating trouble in the fix, you have to reset the machine with service code SP5-810.
Code 350 will disappear if you restart the copier.

change the ink collector located in the rear of the machine

990 A Waste Tank Full Sensor Defective
The waste ink tank full sensor (a
photosensor) on the corner of
the waste tank is not operating.
• Waste ink tank sensor on the corner of
the ink waste tank is defective.
• Replace the waste ink tank.