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what is service code H4 for Sharp AR-151 ?

What does the service code H4 for the Sharp laser photocopier AR-151 mean and how can I possibly repair it if possible. My machine won't do anything when I turn it on, it doesn't even warm up, only the H4 message flashes
Kathleen Cormier, June 2009
link Click here to see other fixes for Sharp AR-151.