Logitech audio system impulse power supply diagnose ?

Discussion in 'Technical Repair' started by UnnamedUser159, Feb 24, 2017.

  1. R!f@@

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    If there no more shorted components in the primary, replace fuse and check with power.

    Just to be safe, keep away from the PSU when applying power, and hope nothing blows up.
     
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  2. UnnamedUser159

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    May 3, 2016
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    What is the idea of heat shrink over the fuse? Have purchased fuses from China and am waiting for them...
     
  3. R!f@@

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    Prevent glass from scattering if it cracks and blows hard.
     
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  4. UnnamedUser159

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    After puting back the new diods, R2 and new fuse /which came today for me/ it does show 0.904 MOhms which seems to be "Not Okey"
    I begin to check all the elements on the board

    edit

    I am showing photo of one capacitor

    How to understand the capacity Voltage and tollerance?

    It`s labeled CD102M
     
    Last edited: Apr 11, 2017
  5. R!f@@

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    Try taking the photo of the part number so that we can see what that little thing is.

    102 stands for 1000pf or 1nf
     
  6. UnnamedUser159

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    About the first one - the labels are really really small. I will measure it and if it s about the value you said everything is ok

    the second one -3a392J
     
  7. R!f@@

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    392 means 3900pf or 3.9nf
     
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  8. UnnamedUser159

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    the blue one is 1000pf really
    The green one is 3.73nF

    edit
    i found one "bad" diod - fr207 - that close to R1 and R2
    It has 0.033 in both direction
     
    Last edited: Apr 16, 2017
  9. R!f@@

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    Remove diode and check
     
  10. UnnamedUser159

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    the resistance is still not as wanted.

    Just to ask - the blue capacitor i think the same as the previous shown, labeled 68 1kv. i measure it out of curcuit 44.6pF. That 68 is pico OR?
     
  11. R!f@@

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    68pf
     
  12. UnnamedUser159

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  13. R!f@@

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    Polyester
     
  14. UnnamedUser159

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    Do you think SMD1 and SMD2 are the same ?
     
  15. R!f@@

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    What are you talking abt ??
     
  16. UnnamedUser159

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    third picture

    I have labeled two elements(resistances) - R14 and R17
     
  17. R!f@@

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    Again...What are you talking about ?
     
  18. UnnamedUser159

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    Again - Read and think.
     
  19. R!f@@

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    My mind is blank.
    If you cannot specify I cannot clarify.
     
  20. UnnamedUser159

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    there are 2 smd resistances and one is not on the board. Because of their place on the board maybe there is a logic they to be the same.
    That`s the question.
    If you dont understand something tell and i will explane again :)
     
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