PWM IC Tester
One of my EGR members from Iran had completed the project of building the UC3842 PWM IC tester. I like the sticker that have all the PWM IC part number (refer to the photo). It is good to have this tester as it could show you whether the PWM IC is in good condition or not. Usually when a power FET or the zener diode have problem we just directly replace the power IC without knowing 100% if it good or bad. And we dare not test the PWM IC together with the new power FET because if the power IC have problem it will surely blow the power FET again. Thus by having this tester you will have a piece of mind of not to worry again if the existing PWM IC will blow the power FET. If you have not access to this project you can click on the photo to visit the website.
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John Preher
July 23, 2009 at 3:21 am
nice, this is a cool little device for sure...
admin
July 23, 2009 at 7:28 pm
HI John,
Hope you could build one too!
Jestine
wahid
October 14, 2009 at 4:55 am
thanks for your hard work.
i hope to help me for repair the power supply (hp.pentium4)
i change all primary elements with the i c UC3845 and when i make power on all things be bad(explos).
admin
October 14, 2009 at 8:57 pm
Hi Wahid,
Have you check all components in the power section? Usually when power ic have problem the power FET may also faulty.
Jestine
Wahid
October 15, 2009 at 10:32 pm
HI Jestine
Thank you Mr J for your answer.
I have changed the power FET (9N 90c)by another power Fet(7N..).
the power supply still wrong.
Wahid
admin
October 16, 2009 at 7:20 am
Hi Wahid,
The FET that start with 9N something is 900volt and the one you have replaced 7N .. was 700 Volt. It may not be compatible and you have to check all components in the power side and test the primary winding of the transformer as well. Have you test the supply voltage to power IC?
Jestine
wahid
October 17, 2009 at 6:40 am
HI JESTINE
I chandeg all components excpte the FET (9N90C).I dont find the some one compatible to the FET.
I cant test the supply voltage because when i make the boutom on the power supply all the power IC and some tr explosed.
Wahid
sokhon
December 4, 2010 at 10:38 pm
i want to know how to test ic uc3845 it good or bad
admin
December 4, 2010 at 11:34 pm
HI Sokhon,
You can use the the above ic tester or oscilloscope.
Jestine
Laurens Sierdsma
March 26, 2011 at 3:49 am
Dear Jestine,
Unfortunately the link for the schematic of the PWM tester did not work. Can you send us the schematic by mail?
Kind regards,
Laurens Sierdsma
The Netherlands
admin
March 28, 2011 at 5:54 am
HI Lauren,
Sorry, the article i have removed it to make it as a bonus report for buyer of the smps repair ebook at http://www.powersupplyrepairguide.com
Jestine
pakdhe
July 17, 2011 at 3:48 pm
Hai Jestine, can you show me the schematic diagram of PWM IC Tester above? I want to make it as my project for my self. Thanks.
admin
July 18, 2011 at 9:13 pm
HI Pakdhe,
I have made this as a report in this website http://www.PowerSupplyRepairGuide.com
Jestine
salman
September 29, 2012 at 12:36 pm
sir i want IC tester for 62 legs
Jestine Yong
September 29, 2012 at 8:57 pm
Hi Salman,
Sorry no info on ic tester for 62 legs.
Jestine
Peter
November 20, 2012 at 10:03 am
Hi Jestine,
I think this link are broken now
http://www.electronicrepairguide.com/how-to-test-uc3842-ic.html
I gat this message
Not Found
The requested document was not found on this server.
Web Server at electronicrepairguide.com
sincerly
Peter
Jestine Yong
November 20, 2012 at 10:57 pm
Hi Peter,
I guss I have removed it to put it as a bonus ion the power supply repair ebook.
Jestine
Evan Evans
December 27, 2014 at 11:17 pm
Yes, it would be a handy unit to build and use but the website underlying the photo DOES NOT EXIST!