| Author |
Message |
    
Timberwolf135
| | Posted on Tuesday, February 10, 2004 - 12:15 pm: | 
|
i have a grant xl pc board pb208ad the radio keys up but i have no audio it is not a mic problem can anyone tell me what to check ond how to check it
also i have a 2nd grant xl also made in the philippines it has a pc board tje018hb how did this happen is this as good as the pb208ad board thanks bill |
Crafter
| | Posted on Tuesday, February 10, 2004 - 3:42 pm: |
|
Does the PA funtion work? If not, try changing the ta7222ap. You might be able to see a crack in it even upon removal. |
Timberwolf135
| | Posted on Wednesday, February 11, 2004 - 10:28 am: |
|
i have no audio on the pa
and i cant seem to locate ta7222ap on my circuit diagram or in the radio |
Jon666
| | Posted on Wednesday, February 11, 2004 - 12:29 pm: |
|
sounds like a blown audio chip.
cant say for shure im not a tech. |
Viking
| | Posted on Wednesday, February 11, 2004 - 5:14 pm: |
|
The audio chip ta7222p (IC6) is a common failure point in these radios. It should have the following voltages:
1- 13.53
2- 6.51
3- 0
4- 0
5- 0
6- 1.15
7- 0
8- 0
9- 6.76
10- 12.79
If wer're looking at the same schematic, it's the sideways triangle (pointing left) in the lower right hand corner. |
Crafter
| | Posted on Wednesday, February 11, 2004 - 8:40 pm: |
|
Screwed to the side of the chassis and soldered to the board. Right side 2 inches from the front with the cover off the speaker side looking at it from the front, little black thing one screw holding it. |
Timberwolf135
| | Posted on Thursday, February 12, 2004 - 11:18 am: |
|
just replaced the ta7222pa still no audio pin1=13.4v pin2=0v pin6=0v pin9=6.5v pin10=3v
thanks bill |
Cdn_superpower
Junior Member
Username: Cdn_superpower
Post Number: 29
Registered: 6-2005
| | Posted on Tuesday, May 23, 2006 - 7:29 am: |
|
I'm in the process of replacing ta7222 also.
I have no audio in or out, except ssb i can talk but it may be only the powermike supplying the audio.
Can you hear any static or even a hum or slight clicking ? |
