Error code 7402
Developing unit C noninstalling error
No density detection signal is output from toner sensor C in developing unit C.
Reinsert the connector. Also check for continuity within the connector cable. If none,
replace the cable.
Developing unit C and Drum relay PWB
(YC10)
Drum relay PWB (YC1) and engine PWB
(YC34)
Long story short, the printer MUST go in for a service as you will void ANY warranty if you try this yourself, it is an electronic failure.
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