1. #1
    Thought I'd share in case it helps anyone in future.
    PLEASE DON'T MESS WITH POWER SUPPLY IF YOU DON'T KNOW WHAT YOU'RE DOING! 350Volts in there!

    My Chinese 6040z died during a v bit carving. Gutted.
    Quickly established that the 24v power supply was dead.

    I opened it up and started checking things. Fuse had blown, indicating fault was in high voltage side. Long story short...

    Bridge rectifier partially shorted out, taking a power transistor and fuse with it. I always replace PWM Controller when power transistors have blown, just to be sure.

    The diode bridge, PWM and Transistors were all Chinese clones of already cheap parts. I replaced them with more trustworthy original parts. The PWM got a slight upgrade as well.

    Click image for larger version. 

Name:	AddTextToPhoto_30-12-2017-1-33-36.jpg 
Views:	240 
Size:	387.0 KB 
ID:	23515


    Diode Bridge: KBU808 (8A/800v), replaced with genuine KBU1010 (10A/1000V)

    Power Transistors: clones replaced with genuine FJA13009TU

    PWM: cloned KA7500B Replaced with genuine KA7500C. The newer C version is more accurate and stable and a direct drop in replacement.

    Schottky Diode: This diode was okay, but I included it as it is a likely failure point. It's running close to the supposed spec and as it's a Chinese brand, it's on probation. I would have replaced it, but didn't have a suitable part handy.

    Total cost of parts 4.(6)

    Anyway- it's running fine now. Steppers sound more even toned when parked and power supply actually runs a fair bit cooler now.

    Hope it helps someone.

  2. The Following 2 Users Say Thank You to PaisleyPCdoctor For This Useful Post:


  3. #2
    Replaced partsClick image for larger version. 

Name:	20171229_212921.jpg 
Views:	79 
Size:	158.8 KB 
ID:	23516

  4. The Following User Says Thank You to PaisleyPCdoctor For This Useful Post:


  5. #3
    Thanks for talking the time to post the fixing procedure and the parts you use.
    Last edited by Nickhofen; 31-12-2017 at 08:21 AM.

  6. The Following User Says Thank You to Nickhofen For This Useful Post:


Similar Threads

  1. Power supply help
    By Davo242 in forum General Electronics
    Replies: 18
    Last Post: 07-01-2016, 12:00 AM
  2. motor power and chinese spindles power HELP
    By DigiSoft in forum Spindles & Drive Motors
    Replies: 5
    Last Post: 16-09-2013, 11:17 PM
  3. Replies: 0
    Last Post: 25-01-2012, 08:29 PM
  4. FOR SALE: 50V 20A Power supply
    By Jimmybristol in forum Items For Sale
    Replies: 8
    Last Post: 30-05-2011, 10:01 PM
  5. power supply
    By hitmythumb in forum General Electronics
    Replies: 6
    Last Post: 21-06-2009, 09:27 AM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •