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01-11-2012, 09:21 AM
Bizhub C6500 have trouble C-4520 everyday and every morning about 3-4 times.
I have made sure the transfer belt is not walking.
PRCB, Color Registration Sensor, and PGC has replaced. But the machine still error everyday.
what's wrong with the machine??
help me please...
Thank you...

01-11-2012, 07:24 PM
Try replacing the corona charges

01-24-2012, 12:36 PM
C-4520 means the Color Reg sensor is not seeing something that it likes. Try running 8 copies of TP 62 to identify a color channel that is not OK. Try the sensor output check for Max Density and Gamma sensors - should be about 120 and all three the same. Know you replaced the sensor but are the shutters on the sensor opening correctly? try IO check 55-0 and 55-1 with the process carriage pulled out and watch them operate.

First thing in the morning and its winter out there. How about the room temp overnight. If it gets too cold (below 55 degrees F) the system does not like it. Have your customer leave the heat on for one night to see if there is a result.

Check the belt line speed adjustment - are the marks at 205.7mm apart?

Run color registration adjustment 3 times. The numbers for the sub scan direction should not change more than = or - 0.5. If they do the transfer belt assembly is suspect - not moving consistently - and that will cause a 4520 too.

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