| Author |
Message |
    
Coolcat
| | Posted on Tuesday, January 27, 2004 - 6:16 pm: | 
|
Hi have a uniden madison it is all stock no mods no tune ups looks like new but has no recieve audio its not the mike its not the speaker. It is recieving as signal meter is working I just get a very weak hiss in speaker if you put your ear up to it.No sound at all out of headphone jack. Also get loud popping sound when you turn channel selector or push in channel 9 switch. Tx works fine and pa works all wires are connected any body ever had this problem. I hate to junk this its like new. Thanks |
Viking
| | Posted on Wednesday, January 28, 2004 - 11:10 am: |
|
Check the audio chip. It's a common probmlem with these radios. If it's a President Madison, the audio chips are different between the 4-pin and the 5-pin versions of the radio. But you said Uniden Madison which would be the same as the 5-pin listed below. The audio chip voltages should be:
4-pin version (IC4 uPc1156)
1- 13.85
2- 7.47
3- 1.37
4- 3.46
5- 3.49
6- 4.06
7- 1.29
8- 0
9- 12.90
10- 6.92
5-pin version (IC6 TA7222P)
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 |
Coolcat
| | Posted on Thursday, January 29, 2004 - 3:09 am: |
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Hi Thanks I will give it a shot. coolcat |
Coolcat
| | Posted on Saturday, January 31, 2004 - 6:10 pm: |
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Well It was not the audio chip any body got any other ideas Thanks |
Xlaxx
| | Posted on Saturday, January 31, 2004 - 11:42 pm: |
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Cool-
If you cannot remedy your problem, send it to 307. I have the same radio as you 8719PLL and sent it to him and he got it smoking. He is reasonable and honest.
You will not be dissatisfied.
Send him an email.
XLAXX
|
Kc0gxz
| | Posted on Monday, February 02, 2004 - 11:59 pm: |
|
Coolcat
If the receive audio on the Uniden Madison is dead, try this.
1- Locate C-186 next to the audio power chip TA7222. C-186 is a 220uF 10 volt electrolitic capacitor.
2- Unsolder one leg of C-186 or just pull it out completely.
3- Power up the radio.
4- If the receive audio returns, replace C-186 using a higher voltage rating such as a 16 or 25 volt.
The capacitance value can be anything from 100uF to 470uF. A 220uF is fine but it has to be small enough to fit in the spot where the original was removed from. When replacing, don't forget to take note of the cap polarity.
The C-186 cap can be left out. However, audio receive will be weak but not dead.
I hope this may be of some help to you.
Jeff, kc0gxz. |
Coolcat
| | Posted on Wednesday, February 04, 2004 - 8:38 pm: |
|
Jeff kcOgxz Pulled the cap today and that was it. Thank You very much Coolcat |
Digger
Junior Member
Username: Digger
Post Number: 13
Registered: 2-2004
| | Posted on Tuesday, March 09, 2004 - 4:04 pm: |
|
Just curious Would this also work on a Presadent Washington with the same ailment.It also has the same chip. thanks
Digger |
Kc0gxz
Advanced Member
Username: Kc0gxz
Post Number: 628
Registered: 3-2003
| | Posted on Friday, March 12, 2004 - 6:16 pm: |
|
Digger
No. Even though the Washington has the same PLL chip, it uses a different PC board.
Jeff, kc0gxz. |
Sle104
New member
Username: Sle104
Post Number: 1
Registered: 4-2004
| | Posted on Friday, April 09, 2004 - 10:34 am: |
|
There is a 220uf cap located next to D-65 replace it and should cure your problem |
