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Audio help for a TRK-7800E

crackling volume audio trk-7800e

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#1 smalltabby

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Posted 17 August 2019 - 09:01 AM

Hello all! This is my first time on this forum.


Just today I found an abandoned boombox next to the trash collection bins and decided to take it home with me. It's a Hitachi TRK-7800E. On the outside it looks fine, just a little dusty. The power cable works and the antenna picks up radio on FM. However the audio crackles a lot and loudly when using the controls, and the speakers use a different level of volume on each off/on switch and occasionally only use either of the two speakers, but both do work. I suspect the speakers have a loose cable inside?


It would be wonderful to restore this old boombox! My technical experience is limited to woodworks in primary school, although we did do some wire welding there and made some battery powers cars and boats :) So where should I start and what do I need to know?




Thank you!

#2 Fatdog

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Posted 17 August 2019 - 11:36 AM

That Hitachi is super clean!  Congratulations!


I would say that the controls only need a good cleaning.  You will need to open the Hitachi to get to the controls on the inside.  A contact cleaner like DeOxit works very well at getting rid of the crackling in sliders, switches, and potentiometers.  Controls usually have small holes where you can apply cleaner.  You don't need too much.  Also, be sure to allow enough time for the cleaner to evaporate before testing.


Welcome aboard!!!!  :thumbsup: :hi:

#3 Nickeccles

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Posted 29 September 2019 - 02:43 PM

Really clean stereo you have these & these are easy to work on & very forgiving, Probably needs a new belt set & it will last you another 20 years easily!!

Also tagged with one or more of these keywords: crackling, volume, audio, trk-7800e