I wanted to throw this out there, an experience from last week.
3552ci suddenly stopped printing yellow with no error codes except hidden C7620 and C7614(auto cal/registration). We went through the whole darn machine looking for obvious failures that could do this without coding, such as primary transfer inside the belt, HV contacts, developer, drum/dv drive, transfer HV, imaging HV, but after all that, it turned out to be a dead laser diode inside the common LSU, that somehow didn't cause any laser BD or stabilization codes!
If I had to go to a call like this again, I'd put a strip of scotch tape on the charge roller and check for a heavy yellow stripe on printouts which is a much faster way to prove that all the rotating and HV systems are working, a tip I learned about late in the process of this call unfortunately!
3552ci suddenly stopped printing yellow with no error codes except hidden C7620 and C7614(auto cal/registration). We went through the whole darn machine looking for obvious failures that could do this without coding, such as primary transfer inside the belt, HV contacts, developer, drum/dv drive, transfer HV, imaging HV, but after all that, it turned out to be a dead laser diode inside the common LSU, that somehow didn't cause any laser BD or stabilization codes!
If I had to go to a call like this again, I'd put a strip of scotch tape on the charge roller and check for a heavy yellow stripe on printouts which is a much faster way to prove that all the rotating and HV systems are working, a tip I learned about late in the process of this call unfortunately!
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