You have the wrong firmware in the machine. What ever is in there needs to be replaced with the proper firmware.
Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/normanj_7893313f0751935f
SOURCE: error c3921
C3921: Fusing sensor wire breaks detection (Center of the heating roller)...
• At the warm-up stage, the heating roller
thermistor/3 voltage does not decrease by
predetermined steps (temperature rise)
within a predetermined time.
Check the fusing unit for correct installation
(whether it is secured in position).
Check the open/close operation of the
upper right door.
Check the fusing unit, IHPU, PRCB and
REDB for proper connection and correct or
change as necessary.
If that check still give you error code 3921
Change fusing unit
SOURCE: c451 Bizhub Konica Minolta printer
press utility. press metercount. press metercount details. press stop 0 0 stop 0 1 to access service mode in service mode look for admin initialialation function
SOURCE: konica minolta bizhub C252 printer Problem
It is supported for Vista according to this chart
Here is the drivers for 32 bit Vista
SOURCE: Bizhub Konica Minolta - Error Code C1183
First check the alignment front and rear of the finisher, check the finisher exit guide rollers if the paper is exiting properly, open both rear and the front cover and check the lower gears attach is the up/down drive belt. that lower gear one might be broken by the pin slot.
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