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This is a somewhat common problem with this printer. You are going to have to have the power supply repaired. The power supply in your printer sits right under the fusing unit and thus gets hot. Over time this causes the electrolytic capacitors in the power supply to swell and go bad. This causes the power to cycle on/off as well as other issues. You will need to order a new power supply board or have your existing one repaired. If you have it repaired or repair it yourself you will need to replace all the capacitors. There are about 5 or 6 of them all grouped together.
Good Luck and Thank You for using Fixya.
Replace all electrolytic capacitors in power supply section on
mainboard. caused by poor quality lower voltage caps being used in
powersupply. Problem will reoccur every 2 to 3 years if 105oC caps are
not used. If mainboard is replaced with new mainboard problem will
reoccur within same timeframe. Fix old mainboard using higher voltage
and higher temp caps and problem will be gone for good.
The most common problems come from uneducated users. Please make sure you read and understand the user's manual, it provides even troubleshooting guides. As with all laser printers, you will eventually need to replace the following:
1. On paper trays and bypass: pickup rollers and separation pads.
2. On printer: fuser unit and transfer roller.