Oscilloscope CRT problem

[LightySA]

Re: Oscilloscope CRT problem

Ok, just test it and it sits at 20uS per wave, so if my calculations are right this means its runs at 50khz.

[budm]

Re: Oscilloscope CRT problem

Thanks.

[monpirri]

Re: Oscilloscope CRT problem

Thanks.

Excellent job ,

I'm still working on mine

[LightySA]

Re: Oscilloscope CRT problem

Let me know if I can help any any way etc. hope you come right!

[monpirri]

Re: Oscilloscope CRT problem

Well ,thanks for your kind offer ,but my problem was a shorted CVT not an open winding as I deduct from your experience.

Now i am checking some HV ballast for LCD Backlight with not a really good results so far; so as my last resort build a HV power supply

[LightySA]

Re: Oscilloscope CRT problem

Are you sure its the CVT, I was also convinced it was that! however it was a component on the output side. I even built a Shorted turns tester to test it as advised on another electronics forum, and it showed the coil as dead! but it really wasn't.

Remember the slightest "drain" on the HV side causes huge current draws on the LV side.

[dandare0648]

Re: Oscilloscope CRT problem

Hi everyone,

I've just scored one of these 'scopes on ebay for AUD40 and I got lucky for once. C901 showed no external symptom but once replaced I have a working scope albeit still a little sick. The jpg's in this thread have helped me achieve my success so far.

I'm keen to get this going and I need the schematic. I scoured the net and it seems the one on rapidonline.com has been removed.

Does anyone still have a copy of the file they could email me please.

Many thanks in advance.



BTW the unit is manufactured by Pintek of Taiwan and rebadged by B&K and lots of others. Mine has a Jaytech (Jaycar Australia) badge.

[dandare0648]

Re: Oscilloscope CRT problem

Hi everyone,

All sorted, the B&K folk have helped me out.

Thanks to all anyway.

Cheers

[Afzal Cassim]

Re: Oscilloscope CRT problem

Hello,my name is Afzal!

First I need to introduce my self.

I am from Sri Lanka, and i am also a Electronics Tech / Software Programmer for some years. I do repairs on Computers,PSU,Alarm System panels,CRT /LCD monitors ,and access control card readers,and sometimes X-ray machines etc.The company that I work for does installation / repair /service of security-related electronics equipment for 20+ years. I am 34 years old.

I am studying at the open university of Sri Lanka(I am a late starter) and do my own repair work in my spare time.

I need advice and help on some CRT scopes that had been given to me from the company that i work for as they were removing old items and upgrading equipment.I had managed to some what 'nurse' a very old leader electronics 40MHz 1041 scope from 'death' and is working and is managable!

I hope to contribute to the discussions in the future.

Thank you.