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Repairing a miserable Motorola 555. Help!

vswr

Disinterested observer
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Aug 20, 2023
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When I got this radio, it was receiving fine but had an intermittent transmit problem. When I decided to reflow the board, I lost everything. Now I hear a faint and untunable USB channel on all 40 which tells me ive screwed up my vco or pll. I have another 555 that has no receive, transmits perfectly on frequency on all 40 but in receive mode all I get is static and the needle pins. Any help would be appreciated.
 
  • Wow
Reactions: doffo

Oh. I forgot to mention that I used a proper soldering iron and I've done many radios before so its probably something simple yet hard to locate
 

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  • @ heartbreaker3473:
    Hello gentlemen and Ladies. I have the dreaded RCI-2990 receive issue where my radio gets distorted when people get close to my location. I found the C90 Capacitor, but I can not for the life of me find the C89 capacitor. Can or does anyone have a picture of the exact location of C89 ? Thank you in advance, Wes
  • @ AudioShockwav:
    Wes, it's better if you start a thread on the main forum, more people are going to see your question.
  • @ heartbreaker3473:
    Okay, sorry, will put in a forum
  • @ heartbreaker3473:
    I put it in the general disscution help area and started a new thread. Thank you for letting me know.