System error main switch off/on 4200 - Kyocera Km-6030 With Feed, Finisher, Bank, Print, Scan - 270k Copies

If you wish to get some details; check the site linked here. Pull up older posts..
http://electro-medical.blogspot.com/

that error indicates there is a problem with the scanning section

CIS Lamp fault check properly...

Try the main charge first...if not working Replace the laser unit.

As an error, the C-4200, refers to laser unit. Sometimes the main charge (mc) cause this error. Remove the mc and check the sound of the laser. If you don' t hear the laser sound, then the problem is the laser unit

You apparently have unheard messages on the voicemail system provided by your telephone company. This system records messages when someone calls while you're already on the phone. Please contact your telephone company for instructions on accessing their voicemail system.

i have 7410 error call service. i tried to clean everithing en replaced the tone is almost full- still getting the error message.hat can i do. (fs-3900dn)

the C-4200 is as follows for this model:

BD steady-state problem
• The VTC detects a BD error for 600
ms after the polygon motor rotation has been stabilized.
Defective laser diode.
Defective polygon motor.
Defective main PCB.

Solutions:
Replace the LSU (see page 1-6-20).
Replace the LSU (see page 1-6-20).
Replace the main PCB and check for correct operation.

A little hint check the filter in the Bypass or MP tray its at the top and if it is filled with a lot of dust than the Laser is the most likely problem. Their is another filter next to the MP tray to get to this one you have to remove four screws that hold the cover by the MP tray (the side cover). once it is off you will see 2 wire connectors and if you look in the cavity you will see another filter area (probably caked down with dust).
Hope this helps.

Please take it to authorised service center, This may be main board problem or needs reset.

best case scenario... laser scanner harness or cable loose or bad... medium case scenario... laser scanner unit is bad... worst case scenario main board is bad...

I’m happy to assist further over the phone at https://www.6ya.com/expert/norman_d2fa496dce30c65d