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Old 6th Apr 2021, 12:40 pm   #21
vosperd
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Default Re: Philips PM3215 Oscilloscope problem

PM sent. Many thanks.
I have the brige rectifier on its way and will post again in a few days when it's replaced.
Don
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Old 9th Apr 2021, 11:51 am   #22
vosperd
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Default Re: Philips PM3215 Oscilloscope problem

Hi
I have received the thermal fuse thanks to barrymagrec.
The bridge rectifier came in the post yesterday and is now soldered in.
I did a few checks before applying any mains and no longer have the short that I had originally.
However, there is a bit of an anomaly, with the psu board totally unplugged I have a short between the negative 30V and the ground of the dc supplies and I can, as yet, see no connection or any failed component that might cause this.
Any suggestions welcome before I try running it up on a variac.
Don m5aky
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File Type: pdf pm3215 psu.pdf (1.39 MB, 59 views)

Last edited by vosperd; 9th Apr 2021 at 12:07 pm.
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Old 9th Apr 2021, 12:57 pm   #23
vosperd
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Default Re: Philips PM3215 Oscilloscope problem

OK. My eyesight probably needs checking. It looks like there is a direct connection to ground at V206.
Magnifying the diagram it shows a connection rather than a crossover.
Don
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Old 13th Apr 2021, 10:32 am   #24
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Default Re: Philips PM3215 Oscilloscope problem

just to say the the scope is now working fine I would appear that it was just the bridge rectifier that was faulty. I will be using it with a temporary fuse just to be sure then I will wire in the thermal fuse.
Many thanks for the help and advice.
Don m5aky
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