Author Topic: Pioneer Tuner/Amp repair [FIXED]  (Read 4765 times)

0 Members and 1 Guest are viewing this topic.

Offline on4top

  • Regular Contributor
  • *
  • Posts: 53
  • Country: be
Re: Pioneer Tuner/Amp repair (Fixed ! )
« Reply #25 on: December 30, 2016, 11:18:17 am »
i got bd249 .. but that's tooo beefy

bd139 i should find in someones junk box :)

« Last Edit: December 31, 2016, 04:20:56 pm by on4top »
 

Offline KhronX

  • Frequent Contributor
  • **
  • Posts: 335
  • Country: fi
    • Khron's Cave - Electronics Blog
Re: Pioneer Tuner/Amp repair
« Reply #26 on: December 30, 2016, 11:37:50 am »
To be on the safe side (and i'm a bit "OCD" about symmetry ;D ), i'd replace both of them (ie. on both channels).

Since mzacharias said they often fail, might as well save yourself some headaches down the line :)
Khron's Cave - Electronics - Audio - Teardowns - Mods - Repairs - Projects - Music - Rants - Shenanigans
 
The following users thanked this post: on4top

Offline on4top

  • Regular Contributor
  • *
  • Posts: 53
  • Country: be
Re: Pioneer Tuner/Amp repair
« Reply #27 on: December 30, 2016, 11:39:02 am »

yep that is the plan ..

wil order some now ..  just want a proof of concept now en see both channels working :)

will have to wait until next week ..
 

Offline mzacharias

  • Frequent Contributor
  • **
  • Posts: 633
  • Country: us
Re: Pioneer Tuner/Amp repair
« Reply #28 on: December 30, 2016, 02:06:57 pm »
Late '90s Pioneer stereo and surround receivers were rife with the things. Noisy channels, protection issues, etc. Due to difficulty for access to replace them, it was standard to replace all of them in a given unit. A five-channel model might get 20 transistors replaced in total, mainly to prevent re-do's and similar future problems. Seems the transistors were somewhat "stressed" over time by circuit voltage etc. I asked our Pioneer service rep if there was any recommended upgrades - there were none. Guess they just "didn't care" to re-engineer or research proper substitutes.
 

Offline KhronX

  • Frequent Contributor
  • **
  • Posts: 335
  • Country: fi
    • Khron's Cave - Electronics Blog
Re: Pioneer Tuner/Amp repair
« Reply #29 on: December 30, 2016, 02:40:01 pm »
Even though those long TO92 package are rated for 1W usually, it's still a bit of a stretch, in VAS duties. TO126-packaged ones are more usually seen (in more "proper" designs) :)
Khron's Cave - Electronics - Audio - Teardowns - Mods - Repairs - Projects - Music - Rants - Shenanigans
 

Offline on4top

  • Regular Contributor
  • *
  • Posts: 53
  • Country: be
Re: Pioneer Tuner/Amp repair
« Reply #30 on: December 31, 2016, 04:14:56 pm »

seems i was lucky yesterday ..

local electronics store had  2 pairs of them on stock ..  2,40euro a piece ..

swapped them yesterday night ..

https://www.youtube.com/watch?v=8iUOQ0PnjG8&feature=youtu.be

Now stress testing ...

Thanks everyone here on eevbog forum for your input !    I learned a lot with this repair  ..

Happy new year !




 

Offline mzacharias

  • Frequent Contributor
  • **
  • Posts: 633
  • Country: us
Re: Pioneer Tuner/Amp repair
« Reply #31 on: December 31, 2016, 08:21:21 pm »
Even though those long TO92 package are rated for 1W usually, it's still a bit of a stretch, in VAS duties. TO126-packaged ones are more usually seen (in more "proper" designs) :)

Glad that worked out for you!  :-+
 


Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf