Replace the image unit
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SOURCE: error c2557 konica minolta 250/NEC IT2530
Reset it, start it with the right door open, go to service mode, clear the counters for drum and developer and go to functions menu. Close the right door and start immediately the F8 function. It should work.
SOURCE: how to clear error code c 3421 on konica bizhub
C-3421 = Fusing heaters trouble
To Reset:
1. Turn OFF the main power switch.
2. Turn main power switch ON while pressing the Utility/Counter key.
3. Touch [Trouble Reset].
4. Check to make sure that [OK] is displayed and the it has been reset.
5. After turning off the main power switch, turn it on again more than 10 seconds after and check if the machine starts correctly.
If error code returns a technician is needed to replace fuser section. Call local dealer with error code and tell them to make sure a tech brings a fuser assembly.
SOURCE: KONICA MINOLTA C253 COLOUR MACHINE ERROR
The c-d403 code indicates a checksum error. Try turning the copier off and on via the Main power switch either behind the copier or inside the front door of the copier. Checksum error along with no operation panel means something could be fried on the main board.
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