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Success Stories If you have successfully repaired or restored a piece of equipment, why not write up what you did and post details here. Particularly if it was interesting, unusual or challenging. PLEASE DO NOT POST REQUESTS FOR HELP HERE! |
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22nd Jan 2018, 3:56 pm | #1 |
Tetrode
Join Date: Sep 2008
Location: Brighton, East Sussex, UK.
Posts: 71
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Levell PU33 PSU Fixed
Hi,
I wanted to share how I fixed my PU33 PSU/battery eliminator in my TD200DMP sig gen. There doesn't seem to be any info or diagrams for this particular PSU, not that I could find so took some photos of the unit. The fault was that one of the 150uF 40V capacitors had bulged and went faulty, which then gave me about +10V - 10V on the rails. I replaced them both with four 330uF 35V capacitors, putting two in series to make up 165uF at 70V, close enough. Please also find the circuit diagram below, off load values and on load values should you need to fault find. The 8V2 zener diodes are behind the 9V battery connectors on the outside of the metal case. The 1K2 resistor does get hot and my guess that it is around 3W in value. I didn't measure the current drawn on the rails. Cheers, DD |
26th Feb 2018, 10:26 am | #2 |
Dekatron
Join Date: Feb 2009
Location: Chesterfield, Derbyshire, UK.
Posts: 3,763
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Re: Levell PU33 PSU Fixed
Well done with the fix, when I have a piece of modern equipment to repair I always check the capacitors in the power supply .Mick.
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4th Mar 2018, 11:27 am | #3 |
Dekatron
Join Date: Apr 2005
Location: Bewdley, Worcestershire, UK.
Posts: 4,748
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Re: Levell PU33 PSU Fixed
Thanks for sharing the story and the reverse-engineered circuit! Well done.
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