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Thermal sensors in AV gear

I've got a Denon 5-channel receiver that has a fan on the heatsink. The fan doesn't run and the unit overheats, unless I short the heatsink fan test pins -- then the fan runs at low speed and the heat is controlled.

On the heatsink are a couple of temperature sensors that look like junior-sized TO-220 transistors, except they're grey and have two wires for legs. The two of them measure differently (resistance vs. heat), but I don't know which one (if either) is faulty.

How do I test these things, and where do I get replacements? The numbers on them don't look much like part numbers.

thanks, Isaac

Reply to
isw
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they are either PTC or NTC.. positive or negative Temperature coefficient devices. they both should be with in 10% of each other at rome temperature..

i am only taking a guess here. you could have a silicone type one also.

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Real Programmers Do things like this.
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Reply to
Jamie

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