Hi,

I have an AWA 229 television, that I restored a decade ago. Ran it for a few hours yesterday, and all was going well, until suddenly no sound/video, and no noise on the screen. No bangs, no smoke, and I'm currently trying to diagnose the problem, but with no success so far. Have swapped out relevant valves for known good ones, and although it was unlikely a valve was the problem, I like to do the easy stuff first.

So if you have any suggestions, happy to hear them.

Also, I noticed the service manual I have for the TV (1st edition) is different to the actual TV I have, although the model number is the same.

The TV I have has two speakers, and a tone control. Among other differences, the 3rd IF valve is a 6U8 and not a 6BQ7A as shown in the circuit. Wondering if anyone might have a copy of what I assume is the updated model 229.

Thanks,
John

Found the no video/sound problem. A 1meg open circuit resistor in the tuner (HT dropper resistor).

If anyone still has the correct circuit diagram would be much appreciated.

John

Did you mean a 6U8 & not a 6CQ8? If so, both valves are interchangeable.

On page 23 of the manual in the Circuit Code section it shows that the 229 does indeed have two speakers. The circuit code for the second speaker, LS102, is not shown in the schematic.

The tone control is a mystery. Where is it connected in the circuit?

Not even the JR books have an updated version of the schematic if it exists.

Tone control is part of the combined tone/volume/power on and off switch control. On the front panel it is the left control. I didn't trace the wiring to see how and where it is wired to. It all looks original, and the control knobs on the front are obviously original.
Yes, sorry, I did mean a 6U8. Got confused with the tuner valve.