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
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
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.
-- 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
what is the integrated circuit assuring the oscilator function in your supply ?
-- 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
"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.
-- Thanks, Fred.
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
-- Joe Soap. JUNK is stuff that you keep for 20 years, then throw away a week before you need it.
Fred, that's brilliant - can't thank you enough.
Jim
Thanks anyway, but I was after PM3323 and nothing there is close enough I'm afraid.
Jim
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