Looking for a 2W 1 ohm fusible resistor
mtapley at swri.edu
Thu Mar 3 09:34:18 CST 2016
On Mar 3, 2016, at 9:21 AM, tony duell <ard at p850ug1.demon.co.uk> wrote:
>>> The original resistor (as mentioned in the Subject: line) was one of those safety fusible
>>> resistors. AFAIK none of the ones that Farnell stock are.
>> Oops, I missed that part of the subject line. It'll be fusible for a
>> reason, so should be replaced with the same type. Moreover, if it's
>> gone, there's probably something else wrong too, so maybe Adrian needs a
>> pair ;-)
> I know rather more about this than Adrian has said, so I might as well
> let on. It's from a VT100 power supply board, it's in the chopper circuit.
> The chopper transistor has failed short-circuit B-C and open B-E and this
> took out the resistor (as far as I can tell).
> Knowing how chopper circuits behave (or don't!) I agree this must be replaced
> by a fusible resistor. Otherwise next time the chopper fails it might be
Speaking from complete ignorance, could it be a normal resistor and a fast-acting fuse in series? Aussuming the correct fusible resistor is not easy to locate and that there is room to hang a fuse holder off of the circuit board there?
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