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Akai S1100 sampler ...bad capacitors?

Discussion in 'Troubleshooting and Repair' started by Rockreid, Feb 24, 2016.

  1. Rockreid

    Rockreid

    1
    0
    Feb 24, 2016
    Hi, new to forum. I have an old 90's Akai S1100 sampler that worked when I first bought it off Craigslist a few years ago. A few months ago it started malfunctioning where the sound quality degraded and was very thin with no bass. Now, the unit will not even boot up. It boots off a floppy drive (w.OS 4.3). The screen powers on but no boot sequence and no text.

    I opened up the unit to check for obvious component failure and saw these caps on the motherboard. I have never seen capacitors with these bulges at their leads before and was wondering if this was normal. I see no signs of burning or failed components inside the unit except for these capacitors. All fuses appear to be normal. image.jpeg image.jpeg
     
  2. 73's de Edd

    73's de Edd

    2,618
    1,067
    Aug 21, 2015
    .


    Sir Rockreid . . . . . .


    Those are filters that have 3 components covered up within the potting compound and are perfectly normal looking to me.
    That yellow capacitor which looks to be a 3.3 ufd unit, looks to be tilted over a bit, see if it was just from being mounted that way or if its seal / plug at its bottom has been pressurized out and is the cause for that.

    73's de Edd
     
    hevans1944 and davenn like this.
  3. 73's de Edd

    73's de Edd

    2,618
    1,067
    Aug 21, 2015
    A continuance . . . . .


    My "window" of access to edit had transpired after I had added "The . . . .
    and left it alone too long . . . . . before adding to it . . . . .

    The tonal response fallacy, if being concurrent with a gradual decline of an electrolytric capacitors capacitance value, would be over in the analog audio processing area of that "circa anno 1993 " unit of yours . .
    Declining capacitance on an interstage coupling cap function equates with declining low frequency passage, as also would be with one used as an emitter bypass capacitor, but with it also effecting stage gain a bit also.

    Thassssit

    73's de Edd
     
  4. elebish

    elebish

    177
    12
    Aug 16, 2013
    Those 'bulging' caps probably have small inductor coils internally and are classified as filters accordingly. If they read shorted, that would be due to the coil.
     
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