Motorola ts907 low hv

[Username1]

Originally Posted by timmy

Would it be a bad idea to jump the thermistor to at least see what the voltages show.the strange thing is first turn it on b+ will show 390v but steady it drops and lands at just making it to 360v.

You may cause excessive current to flow. You can check the AC voltage drop
across it.

It might be a good idea to check line voltage, & Compare it to the primary
of the power transformer. I think it should be a small difference maybe
10VAC no more......??

113V at cheater cord, Maybe 108VAC at primary???? I don't know what to
say about that, I have no idea what THAT Thermister's specs are???

The Thermister at 25 Ohms cold, My Guess is it would go close to
Zero when it warms up, So Very little voltage drop across it.
when it's hot....

L46, & L47 appear to be line filters, There appears to be no Degaussing
circuit on the schematic. The Thermister must be to prevent a surge.


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