Hello Guys,
I'm so grateful for the useful comments you made. Yes I'm copier tech for 21 years. It just occurred as a faulty board on the Black/Cyan laser. There was a break behind the port housing the steel connect. It caused shortage to cause that problem. Instead of replacing the whole laser unit, I chose to replace the board alone on the faulty laser to be sure. It worked perfectly.
Once again thank y'all for your kind suggestions!
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