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Motorola cm550 audio mod

S

Smack32

Member
Aug 26, 2023
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Hi all.. I just pickedup a Motorola CM-550 ssb radio
Its in fantastic shape .. Totally virgin ..
I'd like to openup the audio .. It's doing 4 to 5 dead key. But low audio
Can't find any info on this.. Like to set it up for by brother to use..
Can anyone help as to what to do or look for..
Thank You
 

Web search shows a old thread here about the 550.
NZ8N's posts confirm powered Mic and CB 555 board.
Also the Sam's issue number.

Motorola 555 ssb base tx issue

Got a friend who has multiple of these Motorola 555 base am/ssb and he wanted me to ask, to see if anyone has a known fix for TX dropping out... on Motorola SSB rigs ? Thanks in advance much appriciated, Retro
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73
Jeff
 
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Reactions: tecnicoloco and NZ8N
AudioShockwav said:
Are you using the standard Motorola Mic?
Its been a while but If i remember right it uses voltage supplied by the radio to power the amp board in the Mic.
I think it is the same board as the CB 555.

73
Jeff
Click to expand...
Tried the stock Motorola mic and a astatic power mic.. Same issue .. I have 2 550s tried comparing but couldn't finf anything the 550 I had is great sounding had it peaked back in the 80s. The tech is no longer with us that did it.. I'm not familiar with Motorola products ..
Not sure if it's a pot.. Transistor diod resistor that has to be molded. Don't want to ruin anything it's a virgin radio in mint condition . Just want to get the audio opened up.. Give it to my brother with a cs-1 to use as a base
 
Look here.
Link Posted by Brandon in your other thread.


Motorola CM540 no rx

hello friends on this forum, I have a problem with the motorola cm450 cb and I see it's the same as the 555 can't rx and tx, the radio turns on only the noise freq is empty, I'm looking for the schematic but haven't found it, I hope my colleagues here can help solve this problem..thanks in advance..
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  • @ BJ radionut:
    +1
  • @ 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.


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