Warm up message is a common issue on this series and is never I repeat never caused by the formatter. I have worked on over 100 of these and the issue is generally the fuser but at times it is the dc controller or power supply. Engine test will never work if the fuser has not reached the correct temperature. All 3 items, fuser, dc controller and power supply are the only items responsible for the fuser reaching the correct temp. Formatter has nothing to do with the engine warmup and only relays the message from the dc controller to the printer display.
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