Don't Miss

No Power FURMAN PL-8 II Power Conditioner Repaired

By on October 25, 2014
furman power conditioner repairing










I would like to share my experience in Furman Power Conditioner repair. I have repaired many electronics devices.  But in this case the problem was a bit different.  The complaint was it has no power at all.  I took out the board and checked on the big capacitor but the capacitor was found to be good. I’ll tried to checked the parts one by one from the primary to secondary and the voltages was until only at the Relay area.

 furman power conditioner repair

I further checked the diodes, transistors, transformer and relays and all found to be good.


I did not give up and continued to check for bad component and eventually I found one Mylar Capacitor in the primary AC input the value is 274nf / 400v (.27uf 400 v) was open circuit.

 furman power repair

I ordered the part from and after replacement the Power conditioner was working perfectly. Thanks to Mr. Jestine Yong for providing a platform (blog) to post (share) articles.

“This article is contributed by Fernando Frias from Abu Dhabi UAE. He is currently working in a Technologies company as a technician.

Please give a support by clicking  on the social buttons below. Your feedback on the post is welcome. Please leave it in the comments.

P.S- Do you know of any your friends who would benefit from this content that you are reading now? If so, forward this website to your friends or you can invite your friends to subscribe to my newsletter for free in this Link.





  1. Yogesh Panchal

    October 25, 2014 at 12:19 pm

    Congratulation !!!

  2. biruk aweke

    October 25, 2014 at 1:07 pm

    very nice solution thanks.

  3. Taofiki ishola Akinleye

    October 25, 2014 at 1:44 pm

    Thats nice article thanks very much.

  4. Mark

    October 25, 2014 at 3:31 pm

    Hey Fernando,

    Thanks for the article. I agree, Jestine has given us a great opportunity to share what we have learn, both the successes and failures, which in the end help us all to learn the best diagnostic path. Keep up the good work.

    • Fernando Frias

      October 26, 2014 at 12:43 pm

      Thanks Everyone!

  5. l.boopathiraj

    October 25, 2014 at 4:00 pm


  6. Alain

    October 25, 2014 at 8:23 pm

    Great Article! A nice thorough check, and glad you didn't givie up!
    I use these power conditioners in my line of work all the time and they play a vital role!

  7. Dari

    October 26, 2014 at 4:33 am


  8. nebil salman

    October 26, 2014 at 5:40 am

    i was very happy to subscribe your website,that has been helpful updated technical news i get in to it.

  9. Jose Guerrero

    October 26, 2014 at 7:03 am

    Thanks for sharing Fernando!, only a question, the problem capacitor open is in series o paralell configuration win the AC input?some years ago I find a problem with a Industrial UPS that not turn on, the problem was a Power relay, the coil OK, but not turn on, contacts OK 220 VAC input OK, then change the relay an turn on ! really no can see the problem and still I am intrigued, well, works, an the goal was reached, but my curiosity turn the red light, some day, I willlearn more about this power circuits!
    Best regards to Abu Dhabi

    • Fernando Frias

      November 5, 2014 at 8:33 pm

      Yeah Parallel in the AC input!

  10. imam

    October 26, 2014 at 7:15 am

    thank you ery much

  11. tesfaye kebede

    October 26, 2014 at 10:54 am

    Thank you jestine i love your site !!!!

  12. Robert

    October 26, 2014 at 3:06 pm

    Good job Fernando. Thanks for sharing your work with us.

  13. Paulo Barbosa

    October 26, 2014 at 5:58 pm

    Was it in series or in paralell with the 220V AC input?

    • Fernando Frias

      November 3, 2014 at 7:21 pm

      It's parallel to the 220v AC input

  14. shahid ahmad

    October 26, 2014 at 11:55 pm

    well done...

  15. Joshua oloo

    October 27, 2014 at 12:17 pm

    Thanks for the article Mr.Fernando. keep it up!!

  16. Humberto

    October 29, 2014 at 10:06 pm

    Good for you Fernando Frias, congratulations.

    • Fernando Frias

      November 3, 2014 at 7:23 pm

      Thanks Humberto!

  17. daniel osiobe

    November 5, 2014 at 1:55 am

    i would like to know what kind of test instrument did you used to figure out it's an open circuit. unlike the electrolyte capacitor when it's in good condition the pin of a analog multimeter reflects forward and back to its resting position. i will be curious also to know how one can determine a good mylar capacitor with a analog/digital multimeter.

    • Fernando Frias

      November 5, 2014 at 8:49 pm

      You can order ESR meter to Mr.Young!
      for testing the capacitor.

  18. mari-louise

    May 22, 2019 at 4:24 pm

    Thanks a lot! Will try to change the component and hope everything will work again!

  19. Stefano

    October 22, 2019 at 2:49 pm

    I have the same problem, in the same unit! I can’t find the capacitor for replacement as the original has that number on it (that seems to doesn’t have any sense on the web...): WFA274K 450v
    Can you help me on that please ?
    Thanks in advance

  20. Marc Smith

    February 4, 2021 at 2:33 am

    Thank you for this. Is there a schematic available somewhere in order to trace the circuit?


Leave a Reply

Cancel reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.