You are very right something was missed out from the support information. But all said and done, I tried with the theory of operation on the sequence of operation of the said printer, from all the timing and steps stated in the document everything looks okay, based on the tests I have did on the various components. just after check toner level memory the system now start communication with some optional interfaces where the duplexer comes into play. the cracking noise from the printer seem internal. So, I decided to pull out the duplexer because that is the only way test the unit. the printer started operating normal with its sequential warmup operation. I wouldn't hear any noise again. I started examining the duplex closely, the problem was a stack sensor level, which I relased it and the error disappeared. I did it yesterday. the printer is working now. thanks for feedback.
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