jbl gto 1201.1 in protect

[dman1049 10+ year member]

I have a scope that im trying to use to look and see why its in protect. Issue is as soon as i put power to it with the scope the protect circut comes on and i cant send power anywhere to see whats blown. Can someone point me in the right direction on what to do? Thank you for your time and responses.

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[akheathen Premium Member]

well, have you even reached the point of needing a scope? and, when you say "put power to it with the scope", do you mean that the scope is throwing it in protect when you feed a wave signal, or that it is in protect, so you cannot use the scope? will it power up and idle with nothing but the power, ground, and remote? or will it always power in protect? you need to ohm all the transistors and be sure that you do not read a short on any of the legs in any configuration. you really do not need a scope at all until you can actually get it to idle. you can see the wave fed to the transistors if they are out of the circuit. really, i have a scope that i never use, since it is much easier to use the hz, duty cycle, etc features on my fluke than to warm it up and string the leads. a scope is good for more complicated problems, and if you do not have good features, or reliable latching in your meter. whip the meter out and start there. by the way, do not power any fets that are not clamped to the heatsink. they cook real quick free-air.