| Author |
Message |
    
Cbc544
New member
Username: Cbc544
Post Number: 9
Registered: 2-2004
| | Posted on Saturday, March 05, 2005 - 4:48 pm: | 
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need help with uniden grant with 8719 chip,I have no audio,power is good and receive is good just no audio on transmit,I have changed ic ta7222 already with no results , there is no audio out of pa either ,I suppose I have a bad cap or two but I do not know which ones |
Patzerozero
Advanced Member
Username: Patzerozero
Post Number: 542
Registered: 7-2004
| | Posted on Saturday, March 05, 2005 - 9:44 pm: |
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if the receive & carrier are fine check the mic 1st. i used to love ripping those skinny little astatic 575m6 cords out of the end of the plug while mobiling. |
Bc910
Intermediate Member
Username: Bc910
Post Number: 423
Registered: 7-2004
| | Posted on Saturday, March 05, 2005 - 10:55 pm: |
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Pat
that's what shrink wrap is for.
Put it 'round the cord there at the plug.
It works just like the factory stuff
BC |
Bruce
Senior Member
Username: Bruce
Post Number: 2309
Registered: 9-2003
| | Posted on Saturday, March 05, 2005 - 11:08 pm: |
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i agree with patzero sounds like a bad mike to me too |
Kid_vicious
Intermediate Member
Username: Kid_vicious
Post Number: 260
Registered: 9-2004
| | Posted on Sunday, March 06, 2005 - 12:26 am: |
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cbc544,here's a little test you can do to determine whether or not the mic is the culprit.
unplug the mic from the radio. turn on the radio with a PA speaker connected. switch radio to PA mode. make sure the volume is not more than 1/4 way up. determine which pins on your mic plug (radio), are the ground, TX, and Audio pins. connect a wire from the ground pin to the TX pin. this should "key the mic", now connect a wire from the ground pin to the audio pin, leaving the connection between the ground and TX in place. this should have caused a loud squeal through the PA speaker that only lasted a second because its scared the bejeezuz out of you. if you hear the tone, the radio is working and the mic needs replacing. if you get no squeal, the problems are in the radio.
you mentioned having bad caps. that charged my memory and i think there is a repair mentioned in an old secret cb book about this. i'll look tonite when i get home. check back on monday.
matt |
Cbc544
Junior Member
Username: Cbc544
Post Number: 10
Registered: 2-2004
| | Posted on Sunday, March 06, 2005 - 5:54 am: |
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Have tried 3 diffrent mics with same problem ,have tried jumping the pins as mentioned and I am getting no squeal thru PA |
Cbc544
Junior Member
Username: Cbc544
Post Number: 11
Registered: 2-2004
| | Posted on Wednesday, March 09, 2005 - 6:54 pm: |
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found the problem changed caps c-18,c-153,c-186 and c-95 ,now she is smoking |
Sg569
Intermediate Member
Username: Sg569
Post Number: 242
Registered: 12-2004
| | Posted on Wednesday, September 21, 2005 - 10:45 am: |
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I DID IT AGAIN. I SMOKED MY XL. No audio over am, ssb, or pa functions. I will be checking the caps listed above. I did notice on Sun. that she was not swinging much at all on ssb( about 3w total on ssb- me no likey). Right now when I key the mic the meter drops to 0 and that is all. Receive is good. But that is it.
Thanks sg569 |
Sg569
Intermediate Member
Username: Sg569
Post Number: 248
Registered: 12-2004
| | Posted on Sunday, September 25, 2005 - 4:37 pm: |
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OK,
Seeing as how Rat Shak only had 2 220uf/35v caps, I replaced c18 and c186. The p/a now works hopefully I can get the other two caps mon. morning. So far so good.
Thanks Sg569 |
Kid_vicious
Advanced Member
Username: Kid_vicious
Post Number: 695
Registered: 9-2004
| | Posted on Sunday, September 25, 2005 - 10:08 pm: |
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up the value of C18. it helps when you are pushing a lot of audio through the radio.
i use 680uf.
i also changed out the big cap near the audio IC to a 3300uf 50 volt.
i think these make a big difference in loud punchy audio.
matt |
Sg569
Intermediate Member
Username: Sg569
Post Number: 250
Registered: 12-2004
| | Posted on Monday, September 26, 2005 - 9:17 pm: |
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I'll try that thanks KV.
sg569 |
Cdn_superpower
Junior Member
Username: Cdn_superpower
Post Number: 34
Registered: 6-2005
| | Posted on Tuesday, May 23, 2006 - 12:57 pm: |
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Will that work on my Cobra 2000 ? |
Yankee
Senior Member
Username: Yankee
Post Number: 1211
Registered: 7-2003
| | Posted on Tuesday, May 23, 2006 - 2:31 pm: |
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Hi Chris, Yes The 2000GTL and the Grant XL/LT as well as a few other names are one in the same radio. |
