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evh
Joined: 06 Sep 2006 Posts: 12 Location: england
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evh
Joined: 06 Sep 2006 Posts: 12 Location: england
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Posted: Thu Dec 16, 2010 10:27 am Post subject: |
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Any help for power supply diagrams? |
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evh
Joined: 06 Sep 2006 Posts: 12 Location: england
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Posted: Wed Dec 22, 2010 10:22 pm Post subject: |
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I found the problem without schematic.Very hard to find - one resistor have been changed the value from 220 Ohm to 6 KOhm and a capacitor leakage...
Now everything works fine. |
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evh
Joined: 06 Sep 2006 Posts: 12 Location: england
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Posted: Thu Dec 23, 2010 10:12 am Post subject: |
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It's not a joke,it's true.It happened for second time to me resistor to change the value and it was not power resistor.Really more often happened resistor to break off...
The voltage on the capacitor is 160V and its value was 2.2uF/350V.I putted 4.7uF/450V.
The oscilloscope is still about 20 years old... |
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vtech
Joined: 08 May 2006 Posts: 1264 Location: USA
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Posted: Thu Dec 23, 2010 10:35 pm Post subject: |
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Disregard the previous moronic poster--- I deleted it
Good find..It is rather rare for low-value resistors to change so much in value.--probably more age related. More common for higher value resistors to change value. |
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jts1957
Joined: 24 Nov 2008 Posts: 2476 Location: Far, Far Away
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Posted: Fri Dec 24, 2010 3:31 am Post subject: |
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Unlike the, for example, 1.8 ohm ones in some convergence circuits? _________________ You're over there, I'm over here. |
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evh
Joined: 06 Sep 2006 Posts: 12 Location: england
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Posted: Fri Dec 24, 2010 10:44 am Post subject: |
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The resistor value was changed but not constant,it sifted slowly or unsteady 3,4,6...KOhm |
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