Connect with us

technics amp

Discussion in 'Troubleshooting and Repair' started by shaggy1978, May 3, 2012.

Scroll to continue with content
  1. shaggy1978

    shaggy1978

    3
    0
    May 3, 2012
    i have a technics sua700mk3 amp that keeps blowing the internal fuse with nothing conected no scorch marks on the curcit board any sugestions? ps i carnt spell
     
  2. davenn

    davenn Moderator

    13,798
    1,939
    Sep 5, 2009
    hi there
    welcome to the forums :)

    specifically which fuse is blowing ? is it the one on the mains power input labelled F1 T2A ? or is it one somewhere else in the unit ?
    I found a service manual online so if you can tell me where that fuse is I may be able to help :)

    when you say "nothing connected" I assume you mean the speaker lines and inputs ?

    Dave
     
  3. shrtrnd

    shrtrnd

    3,808
    511
    Jan 15, 2010
    I'm not familiar with the model described here, and like davenn said, it matters what
    fuse you're talking about (power or speaker fuses).
    My comment is I've run across a couple of amplifiers over the years that will blow
    fuses if you turn them on without any load.
    Check your owners manual, make sure it's ok to power the unit up with no load.
    Or that you don't have the power control at a very high setting when you power the amp up.
     
    Last edited: May 4, 2012
  4. docb

    docb

    131
    2
    Feb 11, 2010
    Is it discrete or an IC for the power amp section?
     
  5. davenn

    davenn Moderator

    13,798
    1,939
    Sep 5, 2009
    the power amp is an IC module

    The OP still hasnt returned to answer my questions ;)

    Dave
     
  6. shaggy1978

    shaggy1978

    3
    0
    May 3, 2012
    sua700 mk2

    cheers dave and sorry for the delay computer probs) yes its the main fuse f1 1.6amp on the power board . if the unit is on standby its fine but as soon as you turn the amp on flash gone fuse blown . and yes nothing connected means no speakers or inputs or outputs. any help much apreciated. ps were is spell check? when the problem first happened it was connected to all the out puts as it has been for years. i am new to these forums and dont understand some of the terminology used sorry and please bear with me
     
    Last edited: May 16, 2012
  7. shaggy1978

    shaggy1978

    3
    0
    May 3, 2012
    Is it discrete or an IC for the power amp section?

    not sure what you mean by this.
     
  8. davenn

    davenn Moderator

    13,798
    1,939
    Sep 5, 2009
    discrete = individual transistors

    IC = power module IC ( Intergrated Circuit)


    But as I responded a few posts ago its an IC power module rather than discrete devices


    Dave
     
  9. docb

    docb

    131
    2
    Feb 11, 2010
    Since you have no varaic, I'd start by desoldering the output IC, and see if power comes on without blowing the fuse.
     
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day

-