Scanner PSU

  BAC1-11 21:42 01 Mar 04

My HP 4100C scanner died for no immediately apparent reason last w/end. It was working perfectly then I reloaded the HP software and it hasn't worked since. Intially I thought it was a s/ware problem but then realised that when I plugged in the USB cable the PC wasn't seeing the scanner.

I did try plugging it into a couple of other PC but the result was the same, the PC didn't see the scanner.

I then realised that when I plugged the power in the scan tube wasn't lighting up so I looked the the PSU more closely. The scanner requires 30V DC to operate so I measured the PSU output with an avo and found I was getting 60V on one occasion and 40V on another. Can a PSU(transformer) suddenly do this? I find it strangely spooky that the PSU gave up when I re-loaded the s/ware.

  woodchip 21:48 01 Mar 04

They only use cheap PSU's unregulated. If you are using an old AVO it can put to much load on a system so that you can get falls readings. us a digital

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