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Philips PM-3323 DSO Blowing Fuses

Hoping for a schematic of the PSU section (which is a switcher) so I can start troubleshooting. Blows mains fuse the instant it is switched on, something has shorted out in the PSU.

Jim

Reply to
Jim Attfield
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you may have a resistor or some diodes shorted, surely one or more diode.. easy to check with a multimeter... verify all big resistors ans all diodes as you can have more than one shorted... also check the main transistor which is probably shorted too.

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Jean-Yves.
Reply to
Jean-Yves

Thanks, that's what I plan to do but thought I'd start a trawl for info/schematics anyhow. It's a bit more complex than normal as the EHT supply seems linked to the main switcher as well.

Jim

Reply to
Jim Attfield

what is the integrated circuit assuring the oscilator function in your supply ?

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Jean-Yves.
Reply to
Jean-Yves

I don't know yet, I have still to work out how to disconnect the on/off mechanism - the rod to the front panel goes through the PCB.

Jim

Reply to
Jim Attfield

"Jim Attfield" a écrit dans le message de news: snipped-for-privacy@4ax.com...

A few years ago I reversed the PM3320A PSU. I still have the schematics, but looking at it I didn't completly finished the work. AFAIR it finally was the EHT transistor that was fried and made the main PSU have vapors.

The 3320 and 3323 share a lot and almost surely have identical supplies. Even if the schematics isn't completly finished (maybe up to 95%), it'll be useful. I send you a copy.

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Thanks,
Fred.
Reply to
Fred Bartoli

In response to what Fred Bartoli posted in news:44704295$0$7100$ snipped-for-privacy@news.free.fr:

PM3335 manual and circuits here: ftp://bama.edebris.com/bama/philips/pm3335/PHILIPS%20PM3335-37-SM.djvu

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Joe Soap.
JUNK is stuff that you keep for 20 years,
then throw away a week before you need it.
Reply to
Joe Soap

Fred, that's brilliant - can't thank you enough.

Jim

Reply to
Jim Attfield

Thanks anyway, but I was after PM3323 and nothing there is close enough I'm afraid.

Jim

Reply to
Jim Attfield

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