| Author |
Message |
    
Bushpilot169
New member
Username: Bushpilot169
Post Number: 5
Registered: 2-2004
| | Posted on Wednesday, May 26, 2004 - 1:04 am: | 
|
I was given a cobra 29 ltd classic gold face,
the radio show's a carrier but it has no modg
someone cut the limiter d11 and i soldered it
togeather but it still has no modg (swing to its
thing) i think the audio chip is out of it. My
question is, is the audio chip out or did i make
a wrong guess, im new to radio repair and some
of the stuff is still confusing.
Thanks bushpilot169 |
Tech8541
Moderator
Username: Tech8541
Post Number: 203
Registered: 12-2003
| | Posted on Thursday, May 27, 2004 - 11:43 pm: |
|
is there any kind of audio out of the speaker? if there is audio, then the audio chip is fine. this radio uses 1 audio chip for modulation and speaker audio. |
Bushpilot169
New member
Username: Bushpilot169
Post Number: 6
Registered: 2-2004
| | Posted on Friday, May 28, 2004 - 2:26 am: |
|
Tech 8541
I have recieve, it shows about 4 watts on the meter, when i key it, but when i do audio there is no swing or modulation to it. that's why i
asked if the audio chip is out of it. |
Tech8541
Moderator
Username: Tech8541
Post Number: 208
Registered: 12-2003
| | Posted on Sunday, May 30, 2004 - 12:43 am: |
|
we know the audio chip is working, so you there must be a problem in the modulation chain before the audio ic. without a scope to trace the audio, the only other thing you can do is check to see if other parts in the radio have been cut, and to test voltage levels of transistors. |
Bushpilot169
New member
Username: Bushpilot169
Post Number: 7
Registered: 2-2004
| | Posted on Sunday, May 30, 2004 - 3:21 pm: |
|
Tech 8541
I will start checking for any other cut parts
and voltage's. I did find D 11 cut and I soldered
it back togeather, to be on the safe side I will
replace that diode then start checking everything.
Thanks for your Help
bushpilot169 |
Junkbarren
Junior Member
Username: Junkbarren
Post Number: 36
Registered: 3-2002
| | Posted on Tuesday, June 15, 2004 - 10:03 pm: |
|
first thing i would do is try another mic |
Bushpilot169
Junior Member
Username: Bushpilot169
Post Number: 12
Registered: 2-2004
| | Posted on Wednesday, June 16, 2004 - 11:54 pm: |
|
well guess what guys, I did a real dumb thing,
I did not check the mic gain, if i had turned it upthe first time i would have found out that it
worked just fine.daaaa! well im learning or should i say trying. Thanks to everyone that
helped.
bushpilot169
|
Allagator
Intermediate Member
Username: Allagator
Post Number: 339
Registered: 9-2002
| | Posted on Thursday, June 17, 2004 - 12:32 am: |
|
Buchpilot !!!! he he he dont feal bad i have done the very same thing !!!!! and i bet the best of the techs have done the same thing !!!! LOL |
