tektronix 2445 problem

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- Ed
  
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posted
17 years ago

Fri, Nov 24, 2006 8:11 PM

I recently purchased a used Tektronix 2445. It worked fine for a week; one day after using it for several hours suddenly it shut off and turned on by its self. From that moment nothing was displayed in the screen. I opened the unit and I found a burned fuse (125V 750mA) I replaced with a new one and it burned instantly. I don't know what to do and I don't have a service manual. If anyone has any suggestions of what I should do please let me know, Regards, Ed snipped-for-privacy@comcast.net

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- James T. White
  
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posted
17 years ago

Sat, Nov 25, 2006 1:55 AM

Go join Yahoo Groups - TekScopes. If you don't find what you need in the archives, then ask there.

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James T. White

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- Jim Yanik
  
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posted
17 years ago

Sat, Nov 25, 2006 1:57 AM

"Ed" wrote in news: snipped-for-privacy@f16g2000cwb.googlegroups.com:

ftp://bama.sbc.edu/downloads/tek/2465service/

for the service manual;2445 and 2465 are the same animal except for bandwidth.(determined by the mother board PCB itself!)

Then your 2445 power supply needs troubleshooting and repair. Probably a shorted diode and several electrolytic filter caps with high ESR. Use switcher-grade low ESR caps,not your average RadioShack caps.

Read the circuit descrption to get an understanding of how the PS works. DON'T go in blind. It's not like most switchers.

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Jim Yanik
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