SSlmixed.com Forum
Tech discussion => 4K,6K,8K Series => Topic started by: Hillbilly on December 05, 2014, 12:12:14 AM
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I have just re-capped and replaced all the power transistors in an SL4000 PSU. When I power it up, the Thermal Fault light illuminates immediately.
Has anyone ever had this problem, and/or have a possible solution.
One of the voltage rails took a dump, which prompted the re-build, and I am considering replacing all the thermal fuses. I'm just doing my due diligence.
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I'd say more likely something ain't kosher and the tell tale is telling the truth. Or it took a hit when the supply did. Resistance check should tell you alot.
Alan
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Hi,
while at it, please consider to renew the rectifiers of the rails,
helped here a lot!
Good Luck, Mikel Le Roy
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I also replaced the rectifiers, I'm considering a wiring fault at this point also. I wasn't the one who dissasembled it initially, and had to piece it back together using a complete one as an example.
About the resistance check, should the fuses be open, or closed at room temperature?
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I would think typically closed... they "open" up like a regular fuse when hot.
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fuses should always have continuity.
thermal switches should open at a specified temperature, and reset when below.
both may be present in a SSL psu.
Alan
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It sounds like something is broken or disconnected in the thermal trip circuit it usually takes at least
30 seconds (I would think) for it to be tripped by heat.