Completely agree. I ran the SMPS with just the fan for a whole afternoon before I was willing to go further.
With the 40W series bulb removed :), the SMPS starts up correctly with just the SMPS and the main board. The voltages are a bit off but I don't want to adjust the +7.5V till all the boards are in and the SMPS is running under full load.
More to come.
Priya.
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--- In TekScopes@..., "chipbee40" wrote:
--- In TekScopes@..., "Mover" wrote:
Indeed, the fan is not sufficient load to test the SMPS.
In my post in the original thread I was not implying that the fan alone was sufficient to "test" the power supply, merely that in order to fault find on a non working/tripping supply it was a convenient load/indicator of the power supply ability to function. Some switching supplies will not run without a certain load, this one will run with just the fan attached. Most faults can be rectified just with the fan as an indication. Unfortunately Tektronix omitted power supply expected load information, unlike Philips/Fluke for which scopes I have built full load test boards. JC
