RCA Stereo/ No sound

[Bob A.]

I have a RCA model RS2600 (5-CD,2Tape deck,radio, all in one cabinet)
the sound went out! just as if it was muted, however the "mute"
display is not on? I first tried new batteries in remote to be sure I
had remote operation, I then tried a Known-Good speaker, I then found
some info that it might be the IC stereo amp on the board , so I
replaced it- Still no sound. I obtained the circuit diagram for the
amp driver (made by ST model TDA7269) it shows Vs at terminals 6 & 9,
however I am getting only 1.67 volts and chip specs indicate 22 volts,
I then checked the power supply and it seems good? checked on bench.
Any help would be appreciated!

 

[Jerry G.]

Feed in a signal, as such from an audio generator, and follow the signal
path with a scope. Where the signal stops, is your dead area.

--

Greetings,

Jerry Greenberg GLG Technologies GLG
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I have a RCA model RS2600 (5-CD,2Tape deck,radio, all in one cabinet)
the sound went out! just as if it was muted, however the "mute"
display is not on? I first tried new batteries in remote to be sure I
had remote operation, I then tried a Known-Good speaker, I then found
some info that it might be the IC stereo amp on the board , so I
replaced it- Still no sound. I obtained the circuit diagram for the
amp driver (made by ST model TDA7269) it shows Vs at terminals 6 & 9,
however I am getting only 1.67 volts and chip specs indicate 22 volts,
I then checked the power supply and it seems good? checked on bench.
Any help would be appreciated!

 

[Jerry Greenberg]

The output IC is most likely defective, and some of its support
components along with it. You have to try the IC to test. If the cause
of it blowing is not fixed, the new one will blow right away.

Take care that you properly checked the supply. Use a scope to see
where the audio signal stops along its path to verify.

Jerry Greenberg
http://www.zoom-one.com

 

[Mark D. Zacharias]

I think there is a transistor on the main board which goes bad on these.
Near the center of the board, you'd see the overheated area.

Mark Z.

 

[Art]

RCA has a nack of using low value resistors as fuse devices in these sets,
when an output device fails or overloads it normally will open the
associated resistor (fuse).