My LaserJet 5 (which I found on the curb when it was already old, and used for around a decade longer) also did the light-dimming pulse on each power-up. Other

My LaserJet 5 (which I found on the curb when it was already old, and used for around a decade longer) also did the light-dimming pulse on each power-up. Other than that, the only things I didn't like about it were: (1) didn't seem to have an idle mode, so I had to turn on the power switch every time I wanted to use it, and manually turn it off after; (2) I like my electronics black. When a fan (which seemed hard to replace) failed completely, I decided to part out the LJ 5. I netted money on eBay for some of the easy-to-ship parts, so at least it lived on. I wonder whether the lights-dimming was original behavior. I don't know power circuits, but naively wondering whether some component had gone out of spec (resulting in, say, it charging a capacitor more quickly than it was supposed to), and so the unit was drawing more than it should've from the wall for an instant.