2995 dx no sound

[Strikesmith]

Greetings Gentlemen,
I have a 2995dx that transmits,recieves but no sound,even when I plug external speaker in,Yes squelch
is turned down.

Regards,
Strikesmith

 

[Robb]

Well, then the first place to look should be IC-7.
That will be a Toshiba TA7222AP.
http://www.cbtricks.com/radios/rci/rci_2995dx/graphics/rci_2995_dx_sch.pdf

 

[Handy Andy]

But would PA work - try PA.

IF no audio suspect Audio amp chip and support parts...

Also check GNF board, and J25 connector make sure all wires to those connectors are seated...

 

[Strikesmith]

Gonna give both a try,Got the radio last week,its a mess,ebay deal was working ok then next morning no sound,was bounced around pretty good in shipping!

Thanks Guys!!

 

[Handy Andy]

There are two variants of the board, one with the TA7222ap and TDA2003 chip (5 pin).

The GNF "noise filter" board can interfere with audio - but would TX ok.

Else get to the link Robb supplied - and remember to look for the chip design and the layout is update on the TDA2003 5-pin chip.

Have fun...

 

[Strikesmith]

ok PA works! Gonna pull the covers later!!

 

[Strikesmith]

This radio is a true screwdriver special.power out is controlled by mic gain,output power on front panel doesn't do anything,has switch on back for power mod,lol,but came with dual fans..wow!!

 

[Handy Andy]

Then that means if PA has audio - Audio Amp chip works. Now - work on the mods part - the speaker? Can't help but wonder...

 

[Strikesmith]

wondering if somewhere in progamming memory whatever if theres a MUTE mode,I accidently activated
We gonna get this worked out,Thanks HA!!

 

[Strikesmith]

When I plug external speaker I got nada?

 

[Handy Andy]

More than likely a audio mod in there that's failing.

If my hunch is right they use MOSFET for switching power loads - so to have one fail or the speaker quit working - shows that the original designs' been modified - to what? I don't have much to go on, just your words...

 

[Strikesmith]

will pull covers today and report back!

 

[Strikesmith]

Changed out IC-7 all is well thanks!!