20-11-2012, 01:30 PM
Hi Rob, following your latest post it sounds as though the switch is ok but double check to be sure including L & N polarity as regards live chassis avoidance.
The 200 R reading sounds low if the CZ1 thermistor is fitted in theseries heater chain, the specs for this thermistor can be found in the link I posted earlier.
You will need to re confirm that 200R reading and investigate before proceeding any further, the mains filter capacitor would be the first check followed by a good visual inspection of the wiring asscotiated with that part of the circuit including unintended blobs of solder rattling around, once sorted then you can turn your attention to resistance readings across the HT supply. Checking the mains side of things and the HT side of things by resistance checks is always the way to go before applying any power whatsoever. Note: I have also posted a link to an article on variacs, if you have not already done so it would pay you fuse the output with a suitably rated fuse, the input should already be fuse protected, read the article and it will become apparent. Your doin' ok Rob.
Lawrence.
The 200 R reading sounds low if the CZ1 thermistor is fitted in theseries heater chain, the specs for this thermistor can be found in the link I posted earlier.
You will need to re confirm that 200R reading and investigate before proceeding any further, the mains filter capacitor would be the first check followed by a good visual inspection of the wiring asscotiated with that part of the circuit including unintended blobs of solder rattling around, once sorted then you can turn your attention to resistance readings across the HT supply. Checking the mains side of things and the HT side of things by resistance checks is always the way to go before applying any power whatsoever. Note: I have also posted a link to an article on variacs, if you have not already done so it would pay you fuse the output with a suitably rated fuse, the input should already be fuse protected, read the article and it will become apparent. Your doin' ok Rob.
Lawrence.
