| Author |
Message |
    
Troyota
New member
Username: Troyota
Post Number: 7
Registered: 4-2004
| | Posted on Wednesday, November 08, 2006 - 11:46 pm: | 
|
hello, my friends cobra 25 has no rx. transmit works fine and all other functions work as well. just no receive at all. checked some obvious things like speaker, etc.
thanks in advance for you input |
Kid_vicious
Senior Member
Username: Kid_vicious
Post Number: 2245
Registered: 9-2004
| | Posted on Thursday, November 09, 2006 - 12:17 am: |
|
find out which pin on the mic connector on the radio is the receive pin, and then find out which one is the ground pin.
with the radio on, squelch all the way counterclockwise, NB and ANL off, and antenna connected; jumper those two pins together.
any noise from speaker?
confirm whether speaker is good or bad by using external speaker.
try this and post the results,
matt |
Troyota
New member
Username: Troyota
Post Number: 9
Registered: 4-2004
| | Posted on Thursday, November 09, 2006 - 1:50 pm: |
|
already tried the external speaker. tried other mics also. will try the jumper from audio pin to ground to see if speaker makes noise. |
Troyota
Junior Member
Username: Troyota
Post Number: 11
Registered: 4-2004
| | Posted on Thursday, November 09, 2006 - 6:25 pm: |
|
ok we hooked it up for a while today. after it warmed up, the magic white smoke came from the audio chip. does the audio chip control rx and tx? |
Kid_vicious
Senior Member
Username: Kid_vicious
Post Number: 2249
Registered: 9-2004
| | Posted on Thursday, November 09, 2006 - 10:28 pm: |
|
yes, usually no modulation on TX when it goes.
you can replace the chip, but if you dont know what caused it to go in the first place, you may just burn up the new one too.
good luck,
matt |
Troyota
Junior Member
Username: Troyota
Post Number: 12
Registered: 4-2004
| | Posted on Friday, November 10, 2006 - 10:46 pm: |
|
it was working with modulation and transmit both just no receive. there is another problem now, after the audio chip getting smoked. not sure if he is wanting to try to fix it now, or not. |
Kid_vicious
Senior Member
Username: Kid_vicious
Post Number: 2254
Registered: 9-2004
| | Posted on Saturday, November 11, 2006 - 10:40 pm: |
|
yeah,
not too many CB's are worth the money to fix them these days.
best to just get a new toy sometimes.
good luck,
matt |
