| Author |
Message |
    
Rodder54
Junior Member
Username: Rodder54
Post Number: 15
Registered: 12-2001
| | Posted on Tuesday, December 04, 2012 - 9:45 pm: | 
|
i have good dead key but no mod i have used different mics and still the same power is about 5 watts on a palomar meter and can dummy load 20 amp power supply |
Jrsmith
New member
Username: Jrsmith
Post Number: 7
Registered: 7-2012
| | Posted on Thursday, December 06, 2012 - 1:09 am: |
|
is the receive working properly? also make sure the amc hasn't been turned all the way down VR4. check D11. might want to make sure u have a known working microphone that works on another four pin cobra. just some possibilities. if receive is not working could be the audio amp |
Rodder54
Junior Member
Username: Rodder54
Post Number: 16
Registered: 12-2001
| | Posted on Thursday, December 06, 2012 - 7:09 pm: |
|
i think D11 has been cut and i tried VR4 both ways and in the center ya tried other mics and i have a test mic tester no mod at all for the 129 thanks |
Rodder54
Junior Member
Username: Rodder54
Post Number: 17
Registered: 12-2001
| | Posted on Friday, December 07, 2012 - 10:24 pm: |
|
can you tell me where the audio amp is located thank you after rechecking the receive it is not working good off and on i would say thank you |
Jrsmith
Junior Member
Username: Jrsmith
Post Number: 10
Registered: 7-2012
| | Posted on Saturday, December 08, 2012 - 12:57 am: |
|
sense D11 has been clipped your modulation as you might know is wide open. Question? is your rx working. |
Dale
Senior Member
Username: Dale
Post Number: 1907
Registered: 12-2002
| | Posted on Saturday, December 08, 2012 - 10:51 am: |
|
id say its in the audio ciricuts. being d11
is clipped you already have full audio.if theres
no recieve then the mic maybe wire wrong. the mic
also could have awire off the plug
dale/a.k.a.hotrod
cef426
cvc#64
454 [dx numbers]
38lsb
|
Jrsmith
Junior Member
Username: Jrsmith
Post Number: 12
Registered: 7-2012
| | Posted on Saturday, December 08, 2012 - 6:29 pm: |
|
audio amp is IC4 should be a 10 pin IC. this can get tricky if u decide to test the IC, i'm not sure of your experiance. you do have your dynamike turned all the way up? just checking. what year 29 is it? you can find a service manual online at cbtricks.com. this will tell you the pin voltages for IC4 as well as all other voltages. I would also do a good visual inspection of the unit. u should be able to tell if your receive is working or not I haven't come across a intermitant RX. it is possible though! good luck |
Jrsmith
Junior Member
Username: Jrsmith
Post Number: 13
Registered: 7-2012
| | Posted on Saturday, December 08, 2012 - 7:12 pm: |
|
I found another fix. no tx audio and pa not working, check to see if TR17 is turned on you might find it missing base volts check R70. |
Rodder54
Junior Member
Username: Rodder54
Post Number: 19
Registered: 12-2001
| | Posted on Sunday, December 09, 2012 - 12:38 pm: |
|
i found that to but i didnt understand what they mean by not turned on it has a little volts on both sides i couldnt find R70 i printed that page out too i might toss that radio if i cant get it to work at first i tapped the board for a loose solder joint and rx would come on then now its just gone thank you |
Press_man
Advanced Member
Username: Press_man
Post Number: 696
Registered: 5-2008
| | Posted on Sunday, December 09, 2012 - 4:07 pm: |
|
Checked c-112 ?
73 Pressman
|
