I picked up a nice looking Johnson Messenger 323a over the weekend for 5 bucks at a garage sale. The radio receives well, but it does not transmit. The light turns red when I key up, and it works on PA but does not seem to be putting out a carrier. I don't have time right now to really get into troubleshooting it, but if anyone has any suggestions on what to try first I might give it a try. Any help would be appreciated.
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JOHNSON MESSENGER 323A Problem
- Thread starter pjtnascar
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Could be the Pre driver or the Final transistor that is out an did you have another CB to listen on when you tried to transmit with the Johnson?
Yes I listened on another radio and no carrier. There is audio through the pa though.
KC4RAF
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If by your statement
that there's no carrier, the needle on the other radio doesn't budge at all? If that's the case, then your rf section has a problem. As ecollins11 suggested, the pre, final could be shot. Open up the unit and closely inspect the PCB for any heated or burned spots, (a transistor can be bad and NOT show any signs of heat stress though). If you have some knowledge of electronics, you could use a multimeter to check the transistors to a point.
that there's no carrier, the needle on the other radio doesn't budge at all? If that's the case, then your rf section has a problem. As ecollins11 suggested, the pre, final could be shot. Open up the unit and closely inspect the PCB for any heated or burned spots, (a transistor can be bad and NOT show any signs of heat stress though). If you have some knowledge of electronics, you could use a multimeter to check the transistors to a point.
I'll have to look more closely at it. Luckily, there are schematics available online. Are the transistors easy to find if a replacement is needed?
KC4RAF
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Normally the transistors are available.
If not, you can do a substitute by using a transistor (solid state substitution manual, radio shack use to have them). Or you can goodle search for the transistor.
If not, you can do a substitute by using a transistor (solid state substitution manual, radio shack use to have them). Or you can goodle search for the transistor.
KC4RAF
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If the receiving radio needle doesn't
budge at all, you may want to check Q16 - Q20. These transistors are in the rf section. If you have to replace one, be sure you follow the parameters of the bad one.
budge at all, you may want to check Q16 - Q20. These transistors are in the rf section. If you have to replace one, be sure you follow the parameters of the bad one.
rafdav:
That's what I noticed on the schematc Q16 - Q21. I may test those out tonite. I'll post any findings.
That's what I noticed on the schematc Q16 - Q21. I may test those out tonite. I'll post any findings.
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