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Registered Member #10
Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424
I gutted a Toshiba photocopier a few days ago. Lots of other stuff including 2 HV supplies. They have 4 input wires so I was a bit stuck to work out how to get them to go. This is how I did it.
1 Work out the supply voltage from the main power board. Most things seemed to be 24V rated so I went with that. 2 Check the small filter electrolytic cap polarity with the broader PCB tracks that connects near the input wire connector, to determine which is positive and negative. (No positive is not the red wire - thats just in movies where they defuse the bomb) 3 Connect the supply - start with 12V to make sure minimal current drain at this stage. 4 By trial and error touch one of the two remaining wires to earth. Bingo its running. Cut off the other wire. Draw is about 130mA 24V no load.
The larger supply was 5kvDC, 3.8kV AC and a few smaller voltages. I have added a cap to show it is DC and brighten up the sparks.
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
Some years ago I got a -7kV 0.2 mA hv supply from a laser printer very small and 'cute' I ran a small SGTC off it for a while about 50mm arcs from 0.7W. Lasted a couple of years powering misc. experiments now it's in the pile waiting for resurection.
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HV supplies from a photocopier
