| Electronics > Beginners |
| HP power supply question |
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| bitseeker:
Normally, there's a plastic holder/diffuser that the bulb goes into. The holder is then affixed with a spring clip. The plastic gets brittle with age and breaks loose. My 6200B recently suffered this. A little hot glue or silicone caulk suffices, but it looks like the holder was completely missing from the OP's unit. I'm very curious where the smell is coming from. |
| bitseeker:
A quick-n-dirty way to deal with the neon bulb might be to tape a piece of milk jug plastic over the rear of the hole in the front panel as a diffuser. Then affix the bulb. The viewing angle will be reduced, but it'll glow. |
| Cubdriver:
That neon power indicator appears to be the lamp only, so that means that the series dropping resistor is on the circuit board. Assuming that's the case, make sure that the leads to the neon aren't twisted in such a way that they're shorted, overloading the resistor. -Pat |
| basinstreetdesign:
DJF123, since you got steady voltage out, and I take it at a voltage level that you expected, then that means the regulator circuit, transformer (and meter?) were working. So I would suspect the caps of generating the smell that you detected. That horizontal cap near the transformer looks like it got hot, and probably more than once. It's probably a good idea to replace all 5 of those big electrolytics, anyway. |
| bitseeker:
Taking a closeup look at the first photo, it seems like the power supply was dropped onto the lower-right corner, bending the fin on the heatsink and causing the transformer to bend the two long posts. The transformer's dislocation rotated the PCB clockwise, which broke loose the mount for the analog meter. I'm not sure if the bulb holder sheared as a result of the impact or if that might've been a separate incident (or just age-related, like my supply). |
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