TELETON C18BS

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There’s no sound or raster, though the five fuses are intact
and voltages are present at the mains transformer
secondaries. The tube heaters, also the channel lights, glow.
The touch-type channel selectors work, but channel one
does not appear automatically when the on/off switch is
operated.
The touch -tune system depends on a voltage feed from
the line timebase, which is clearly not working, cutting off
the rest of the set. Check whether the 120V line is present at
the output of the series regulator transistor TR708, and that
it’s reaching the collector of the line output transistor
TR304. If not, check TR708, R414 (10S2), L403 etc. If
power is reaching TR304, suspect loss of line drive – there
should be 89V at the collector of the line driver transistor
TR303.

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