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 AWA 229 Television circuit diagram wanted and also video/IF help
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 Return to top of page · Post #: 1 · Written at 10:29:37 AM on 5 June 2016.
John116's Gravatar
 Location: Blackheath, NSW
 Member since 29 October 2008
 Member #: 370
 Postcount: 38

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


 
 Return to top of page · Post #: 2 · Written at 11:55:27 AM on 5 June 2016.
John116's Gravatar
 Location: Blackheath, NSW
 Member since 29 October 2008
 Member #: 370
 Postcount: 38

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


 
 Return to top of page · Post #: 3 · Written at 12:25:57 PM on 5 June 2016.
MonochromeTV's avatar
 Location: Melbourne, VIC
 Member since 20 September 2011
 Member #: 1009
 Postcount: 906

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.


 
 Return to top of page · Post #: 4 · Written at 5:42:21 PM on 5 June 2016.
John116's Gravatar
 Location: Blackheath, NSW
 Member since 29 October 2008
 Member #: 370
 Postcount: 38

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.


 
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