2000gtl(taiwan)unwanted talkback???

[slim cdx285]

my 2000gtl just started having talkback and it was never

there before.never been installed since i had it(12 yrs).

anyone got an idea where/what to look for? the most common part failure that may cause this? everything else is fine,so i'm at a loss.

thanks.Slim CDX285

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[slim cdx285]

my 2000gtl just started having talkback and it was never

there before.never been installed since i had it(12 yrs).

anyone got an idea where/what to look for? the most common part failure that may cause this? everything else is fine,so i'm at a loss.

thanks.Slim CDX285

</p>

 

[nomadradio]

Wow, haven't seen that problem in years. Seems to me it was a disc capacitor on the headphone socket, maybe? Maybe on one of the speaker sockets.



Unplug the mike and speakers. If any of the small disc caps that are mounted on those jacks show continuity they should be changed.



Another common problem is a speaker jack that comes loose and touches the rim of the hole in the panel. All the speaker and headphone jacks are mounted on plastic "shoulder" washers that insulate the jack's metal bushing from the radio's chassis. A short there can do this, too.



73

</p>

 

[nomadradio]

Wow, haven't seen that problem in years. Seems to me it was a disc capacitor on the headphone socket, maybe? Maybe on one of the speaker sockets.



Unplug the mike and speakers. If any of the small disc caps that are mounted on those jacks show continuity they should be changed.



Another common problem is a speaker jack that comes loose and touches the rim of the hole in the panel. All the speaker and headphone jacks are mounted on plastic "shoulder" washers that insulate the jack's metal bushing from the radio's chassis. A short there can do this, too.



73

</p>

 

[slim cdx285]

OK,Thanks Nomad. I'll give it a try. It's a place to start.I'll keep ya posted on results.

Thanks.Slim CDX285

</p>

 

[slim cdx285]

OK,Thanks Nomad. I'll give it a try. It's a place to start.I'll keep ya posted on results.

Thanks.Slim CDX285

</p>

 

[Cheech]

Yep its posible there is a short between the gound of the external speaker jack and the PA jack. This is one way you add talk back but you use a resistor to controll the volume.

 

[skipshooter205]

talkback

there is also a way to use the mic jack for talkback in some radios i dont know if its possible there is a problem with it or not may also be a shorted disk capacitor on the mic jack? also make sure all grounds on the board are tight

 

[TonyV225]

I know there was a a diode or simular back by the transformer in mobiles that could be cut to make this happen so maybe theres a bad resitor or diode problem that is happening just a thought.