CRT Hercule Turbo no Modulation

[Wenefe]

Hello

I have a CRT Hercule Turbo

Unfortunately, it has no modulation in any operating mode

I would appreciate your help
Best regards from Austria

 

[sp5it]

And that's a reason to post in old threads?
We unite in pain.
What measurements and tests you done so far?
Mike

 

[Wenefe]

And that's a reason to post in old threads?
We unite in pain.
What measurements and tests you done so far?
Mike

Thanks for the quick reply. The device was already with a technician, but unfortunately he gave up. Now I want to try it myself. I have measuring devices, soldering stations, etc. I just need a nudge in the right direction.

 

[sp5it]

Ok, lets start. Link schematic for your radio.
Mike

 

[19wrc333]

Ok, lets start. Link schematic for your radio.
Mike

The schematic can be found here: http://78roger.free.fr/crt/hercule_turbo.htm at the end of the service manual that is linked down there.

 

[sp5it]

Apply audio from signal generator on microphone socket, put it on TX and check if on pin1 marked blue you have a signal from generator. If not, follow red line back to mic socket to find where it disappear.
Mike