President Lincoln 2+ AM/FM no Modulation

[CB-Whisky]

Hello, I need help with my President Lincoln 2+. There's no modulation on FM and AM, and of course not on SSB either. The carrier signal is present with the specified power.
Perhaps someone else has a Lincoln 2+ with the same or a similar problem?

Thanks in advance.

vy 73 Werner

 

[BC Coyote]

Dumb question, but have you tried another mic? Always good to rule out the simple things first.....

 

[CB-Whisky]

Hi Coyote, yes, I tested several microphones, but the carrier modulation isn't fully present.

Thanks for your reply.

73 Werner

 

[sp5it]

Use AF signal generator and scope and trace it from mic socket backwards. You'll find it within minutes.
My bet is cold solder joint at the mic socket or (and) cracked copper foil. Use DMM to check continuity.
Mike