Hi all, another strange problem that I have:
Tandberg CTV model 7R63. No IF output from tuner, and the tuner is
good, (UV1316-philips) tried another one with no help. What seems
weird is, the +33V supply which the tuner requires, is actually
fluctating quite much, between 18V and 21V depending on which channel
is selected. I also made up a constant +33V supply and fed the tuner ,
but with no improvment. Since this tuner is I2C bus controlled I begin
to think the CPU could be bad, not sending anything to the tuner which
is confused. OSD and all other functions is good, also when using the
external inputs the set operates good. This speaks for the cpu should
be good. Any advice is appreciated,
Regards
Stefan

Go to the source for the +33V, and service this part of the supply. In some
models of sets, this comes from the horiz output section, on the secondary
of the flyback. In other models, it comes from an output of the main power
supply.

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JANA
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"Stefan Toftevall" wrote in message
om...
Hi all, another strange problem that I have:
Tandberg CTV model 7R63. No IF output from tuner, and the tuner is
good, (UV1316-philips) tried another one with no help. What seems
weird is, the +33V supply which the tuner requires, is actually
fluctating quite much, between 18V and 21V depending on which channel
is selected. I also made up a constant +33V supply and fed the tuner ,
but with no improvment. Since this tuner is I2C bus controlled I begin
to think the CPU could be bad, not sending anything to the tuner which
is confused. OSD and all other functions is good, also when using the
external inputs the set operates good. This speaks for the cpu should
be good. Any advice is appreciated,
Regards
Stefan