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Dean Markley K-200B bass comb amp problem?

Discussion in 'Amps and Cabs [BG]' started by DavyR, Jul 17, 2013.

  1. Jul 17, 2013 #1
    DavyR

    DavyR

    May 29, 2011
    Found a clean looking 1995 Dean Markley K-200B bass combo amp on a curb 2 blocks away on trash night. It powers up. Humms. No output with a bass plugged into input 1 or 2. No 'pop' when touching the tip of a guitar cord plugged into an input. I do get a 'pop' when I plug a 1/4" cord into the line-in and touch the tip. Headphone output cuts off the 12" speaker power, which nakes sense.
    Any other ways to problem shoot that I can try?
    Is something like this worth paying to fix since these amps only go for $200 anyway?
    Thanks!
     
  2. Jul 17, 2013 #2
    B-string

    B-string

    Nov 21, 2008
    Lake Havasu City, Az USA
    Well the trouble seems to be in the preamp section. Could be something simple and cheap in the preamp sction.
     
  3. Jul 22, 2013 #3
    DavyR

    DavyR

    May 29, 2011
    Wow! Any other, at least, general advice? LOL! Do bass players even bother to attempt to have cheaper solid state bass amps repaired? Thanks.
    DavyR
     
  4. Jul 22, 2013 #4
    B-string

    B-string

    Nov 21, 2008
    Lake Havasu City, Az USA
    Sure, start replacing every part you can find in the preamp board till it works again. THAT general enough? :eyebrow:

    How much electronics training do you have? Do you have the schematic for the unit and know how to read it? Are you well trained with a soldering iron for rework and repair? Do you have any test equipment?
     
  5. Jul 23, 2013 #5
    DavyR

    DavyR

    May 29, 2011
    Not for me to repair but, instead, to take it to a repairman. Maybe I wasn't clear in my post. Let me try this again.

    Is it usually NOT worth it to take a $200 used solid state bass amp, that is partially finctioning, to a repairman? Or, are the odds such that I should just toss it back out on the curb on trash night? If it costs $200 to fix a $200 amp I suspect it isn't worth the trouble. Thanks.
     
  6. Jul 23, 2013 #6
    RickenBoogie

    RickenBoogie

    Jul 22, 2007
    Dallas, TX
    Only you can answer. It would not be worth the trouble for me.
     
  7. Jul 23, 2013 #7
    B-string

    B-string

    Nov 21, 2008
    Lake Havasu City, Az USA
    No one could answer that for you. Could be broken solder joints on the input jack, a blown $1 IC and a couple $0.10 resistors, could just be an inconnect cable that needs to be cleaned and reseated. Could be someone completely fried the preamp PCB. Without spending a bench fee you won't know if it is a $60 repair or more than the unit is new. Do you have any contacts with people that know electronics and want a spare time play project?
     
  8. Jul 23, 2013 #8
    DavyR

    DavyR

    May 29, 2011
    Thanks fellow bass players. I appreciate the responses.