Author Topic: NAD C325BEE Will not power.  (Read 5737 times)

0 Members and 1 Guest are viewing this topic.

Offline Kim Christensen

  • Regular Contributor
  • *
  • Posts: 170
  • Country: ca
Re: NAD C325BEE Will not power.
« Reply #75 on: January 27, 2022, 11:56:38 pm »
Kim Christensen thank you for all your helpful advice!!! I certainly would not have managed to repair this if it wasn't for your excellent help!  :-+

You're welcome. It was a fun exercise for me as well. Good to hear that all is working now.  :)

 

Offline paul_g_787

  • Frequent Contributor
  • **
  • Posts: 442
  • Country: gb
Re: NAD C325BEE Will not power.
« Reply #76 on: January 28, 2022, 12:04:26 am »
Indeed! I do love a challenge and it is good to have some expert help as well!

I learned a lot more than I knew before about how amplifiers actually work from this one. It was good fun! 😁
 

Online Per Hansson

  • Frequent Contributor
  • **
  • Posts: 390
  • Country: se
Re: NAD C325BEE Will not power.
« Reply #77 on: January 28, 2022, 07:20:54 pm »
I would replace the SMD caps on the other module too, if you re-read my post #40 you will see they where bad on both.
 

Offline paul_g_787

  • Frequent Contributor
  • **
  • Posts: 442
  • Country: gb
Re: NAD C325BEE Will not power.
« Reply #78 on: January 28, 2022, 10:10:17 pm »
I would replace the SMD caps on the other module too, if you re-read my post #40 you will see they where bad on both.

I checked the ESR on them both in circuit and they were 0.3Ω and 0.7Ω (I forget which was which). Which I didn't actually do on the other module.
I didn't want to tempt fate and remove the module if I didn't need to just in case I made it worse! I had a very hard time soldering those SMD parts as it is!
 

Offline jhjove

  • Newbie
  • Posts: 1
  • Country: us
Re: NAD C325BEE Will not power.
« Reply #79 on: March 22, 2022, 07:39:42 pm »
New to the forum (typically on diyaudio and audiokarma) and 2+ months late to this topic. Quite a nice dialogue and repair. :)

FWIW, I went through an almost exact repair sequence in February 2021. I acquired a C325BEE (a for-parts-only special) from ebay.
Although in addition to the +/-18V power supply issues, the main power board was fried on my amp. In the end I have a very nice working amp.

I wanted to add that the failed SMD caps on the CB21 + CB22 riser boards I replaced with similar SMD form-factor parts, but solid-polymer type electrolytics.

Again, I enjoyed the thread, very good info.
 

Offline FIXITNOW2003

  • Contributor
  • Posts: 15
  • Country: gb
Re: NAD C325BEE Will not power.
« Reply #80 on: March 23, 2022, 07:50:57 am »
not seen a 325 but have seen some 320 versions these do suffer with poor elec caps  in the protection circuit. and output stages i would check the to see if esr is poor
 


Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf