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Anybody have any ideas about audio pops on a spectra after the
caps have been replaced? It happens when the amp is enabled
(unsquelch the radio, beeps/mode changes, etc). (VHF Front
Although not totally obnoxious, I would like to reduce the amplitude.
Just curious before I get the scope out & start looking.
Thanks for that. I'll check under the tantalums. I did pull the
board out, & it looks real clean underneath. Can't see any
corrosion on any of the vias. Did find some additional
ant i bodies!
what looks like something oozing and sizzling out of the legs of the audio IC itself.
In any case, replacement of the audio chip, and or caps around it usually gets rid of the popping sound.
- Posts: 120
- Joined: Thu Feb 05, 2009 9:53 pm
- What radios do you own?: Spectra, HT1000, Icom F30
I looked into the audio IC and how it uses capacitors to prevent popping on mute/unmute. Using a multimeter, i found out it was one of those capacitors (don't remember which one, I know it was one of the two that are right next to the Audio IC pins.
So I removed one of it's legs, and it really only went a short distance to an audio IC pin. So I just moved the leg, soldered on the leg to the Audio IC Pin leg, and BINGO, no more popping.
If you didn't have the audio pops before the replacement, but have them now, I would put my money on that being the problem. Check those 4 capacitors near the Audio IC, test each pad (put one end on the solder pad for the capacitor and the other on where the trace on the board goes to from that pad, which is usually an Audio IC pin). Maybe your problem isn't as bad as mine. Maybe you just have a bad solder job on one of the capacitors rather than a burned off solder pad.
Good Luck! Happy Thanksgiving in advance!
By the way, an ESR meter is really useful to test all the caps. If any of the tantalums are open, you can see that easily. I found it pointless to measure the factory electrolytics as 90% of them seem to test open (bad) and it would be pointless to leave any in there.
WB6NVH wrote:Other than Moto, has anyone found a reasonable source for those audio IC's? They seem to be something you don't find at Mouser or Digi Key.
We have replacement audio output ICs available. No they were mfg'd only for Motorola. You can use another IC in there but the pinouts are different.
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