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Old 21st September 2011, 11:02 PM   #1
diyAudio Member
Join Date: Sep 2011
Default California Profile 400SX Question

I am doing my first ever amp repair on a Profile 400SX, 400watt amp. I took covers off and looked it over. Everything looked good except a small part marked "TH1" which is soldered to the PCB board, and looks like it is supposed to be connected to the chassis on the other end of part by a screw. The end by the screw is broke and there is no way to reconnect it that I can see. What exactly is this part called, and where can I get one? Thanks in advance for your help!
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Old 21st September 2011, 11:30 PM   #2
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Join Date: Nov 2003
Location: Louisiana
It's a thermistor. The spade terminal isn't likely to be an electrical connection. There should be two wires on it soldered to the board.
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Old 21st September 2011, 11:34 PM   #3
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Thanks for the reply Perry. Yes, there is two wires on it and it is soldered to the board. The other end is like a little black blob, for lack of a better term. So, I'm assuming, the screw hole beside it on the chassis is just to hold down the board? The screw was missing from that hole. Thanks!
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Old 21st September 2011, 11:48 PM   #4
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Join Date: Nov 2003
Location: Louisiana
Yes. It's supposed to be held tightly against the heatsink so that it can sense the temperature of the amp. You can use a different type of hold-down to keep it on the heatsink.
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