the worst thing is what u did to the power switch/flip on & off a hundred times
do u think that is a magic trick ??
u must have created a short to ground somewhere/ pinched wire
remove one connector at a time from the DC Controller /power off/on & check if the Control Panel display pops up- look in manual to see what connector is causing issue
this is how to trace down a short
check your power supplies
AC voltage into the Printer Power Supply,and DC voltage out of the Printer Power Supply
**Knowledge is time consuming, exhausting and costly for a trained Tech.**
Have you tried putting the old fixing unit back in? Your not giving us much feedback on what you have done that was suggested...
You asked: "what could be the problem?" Obviously the fuser was the problem. It had a short, or was the wrong voltage (120v in a 220v or vice versa). Either way it probably damaged the power supply, or you did switching it off/on a hundred times. Which would explain why the problem still happened after you unplugged the fuser. If the power supply isn't fried then there is a good chance you ruined the HDD switching it off/on like that.
QFT
And you called us clowns?
also, QFT
As van steal pointed out, you are not giving us much feedback on what u did with what was suggested .This makes way forward a bit difficult.
checking RAM & Main con PCB
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