Yes, I am here ,thanks for replying back to me.
Check that the volume is turned up and the radio is not muted.
Check that the radio is not on the weather channel otherwise it will mute the speaker.
Try connecting an external speaker and let me know if you can hear any sound through it...
I am not familiar with the internal circuitry on this particular model.
Are you troubleshooting at component level?
Are you getting any voltage to the speaker?
It could be that one of the other components on the discriminator has failed... if you have schematics available you should be able to track it down.
I don't know anyone who works on these radios at component level;
in the absence of schematics I would use another radio as a guide for expected test readings.
Ok, I'll see if the other experts have any further ideas...