tool:laser_cutter:maintenance_logs:2018_05_05
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— | tool:laser_cutter:maintenance_logs:2018_05_05 [2018/05/05 19:06] (current) – created lukecyca | ||
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+ | ====== Laser down due to chiller problem ====== | ||
+ | === Reported symptoms === | ||
+ | |||
+ | It was reported on May 1st by Aaron that a PCB in the cooler started smoking and the laser was non-functional (so the interlock works, yay!). The smoke was coming out of the bigger set of vents. It was thick and white. | ||
+ | |||
+ | === Assessment === | ||
+ | |||
+ | (by Luke Cyca) | ||
+ | |||
+ | The PCB in question is likely the 12V PSU that was added inside the chassis to power the circulation pumps. I disconnected it, and plugged in the chiller and after a minute the thermostat turned on the compressor and chilled the water. | ||
+ | |||
+ | I removed the 12V PSU from the chassis and disconnected the pump. The PSU seems to be toast - It produces no voltage on its output. (I also didn't observe any more smoke). I wrote "not working" | ||
+ | |||
+ | I used a bench supply to test the pump, and found that it's shorted out. | ||
+ | |||
+ | So it seems that the pump failed with a dead short (probably just due to extended use) and drew far too much current from the PSU which released some smoke and then failed completely. | ||
+ | |||
+ | === Recommended Action === | ||
+ | |||
+ | Install a new circulation pump and PSU | ||
+ | |||
+ | Clean the reservoir (it's gross). |
tool/laser_cutter/maintenance_logs/2018_05_05.txt · Last modified: 2018/05/05 19:06 by lukecyca