[Error Code] First C-4176 and then C-4101 C6501

[ServiceGuy_FI]

Hi Everybody,

I wish I can get some insight to one problem with MGI Meteor Dp60 (Konica C6501 engine),

First I got an error C-4716 (Cyan laser unit) and when swapping C with M magenta unit, I got C-4101. Swapped them back to original position and now have C-4101 all the time.

Tested with new PRCB and with new laser unit. Same error.

Found Japanese Konica site with following explanation :

"C-4101

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[Classification]
body
polygon motor abnormality

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[Factors]
when you start the polygon motor / Y (M3), or when switching the speed, M3 lock signal is not detected within a predetermined period of time.

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[Operation at the time of warning occurrence]
body to OFF the main relay (RY1) is immediately stopped.

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[Estimated abnormal parts]
printer control board (PRCB)
AC drive substrate (ACDB)
fixing heater lamp 1 / (L2)
fixing heater lamp 2 / (L3)
fixing heater lamp 3 / (L4)
fixing heater lamp 4 / (L5)
temperature sensor / 1 (TEMS / 1)
Temperature sensor / 2 (TEMS / 2)
Temperature sensor / 3 (TEMS / 3)
temperature sensor / 4 (TEMS / 4)
Warning

If the software DipSW3-1 without repair and abnormal parts to 0, there is a possibility that the fire occurs."

None of the polygon motors spin from I/O Check..

Tested with another fusing unit.. No help...

Any ideas? All connectors seem to be fine...