Hi,
I have a Ricoh Keiki K569 HVPS board from, I suspect, an old HP LJIIIP.
This looks like a very useful HVPSU - does anyone have any information on it?
It looks like its got 4 wires input - Vcc Gnd ENA-1 and ENA-2 where the ENA-x lines enable one of the two HV output. one output is via a small LOPT, the other via a switched inductor with two 1kV MOVs limiting the output.
The two supplies are each controlled by a Ti TL1494CN DIP-16 chip - I can't even find any info on this device except that Ti's site in Japan lists it (no data) but only in Japanese... sigh.. Each supply is the same but with different output stages - the second supply's part numbers are the same as the first's but with 20 added, e.g. Q1 vs. Q21, VER1 vs. VR21 etc.
Any ideas?
Many thanks
Mike