One last week day this venerable machine in daily home use (bought 1991!) just didn't switch on; No clues at all; power source OK. Is there an internal fuse or a reset button inside. Was working perfectly up to failure;
I can't believe that someone is still using one of the first LaserJet printers I got certified on!!! If you really want to gut the machine, there is a fuse in the power supply that could have blown. It is also possible that the power supply has finally died on its own after all of these years. You may just want to check the output voltages first to make sure of the status. If some voltages are present and not others, the fuse is still good, but the output circuitry is shot, in which case you would need to get a replacement power supply (if they are even available anymore).
Be careful with the disassembly process. The plastic clips may be brittle after almost 2 decades and could easily snap apart.
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