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Post subject: Passport 500 Pro "Protect" mode
Posted: Sat Oct 21, 2017 7:50 am
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My 500 Pro will work perfectly for sometimes up to an hour, then the red "Protect" LED comes on and the output is turned off. I'm suspecting a thermal problem because it will run longer before going into protect mode if I pull the Power supply out of the case. I don't believe there is any problem with the output section or the main mixer board. Anyone had similar experience and a solution? It's out of warranty and no repair shops want to touch it.
Update: I left the storage compartment door open and it ran all day without shutting down, which sort of confirms my thermal issue theory. I wasn't there to watch it all day so I don't know if it shut down and came back or not.


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Post subject: Re: Passport 500 Pro "Protect" mode
Posted: Thu Oct 26, 2017 11:14 am
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Aspiring Musician
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You are right. All the Fender Passports have protective thermal circuits. If the unit overheats, it turns itself off until it cools off, instead of burning out like a fuse, forever gone.

So, you need to either load the system less, so it generates less heat, or cool the system more so it dissipates the heat that it generates. The only third option is to use it without loading it less or cooling it more, and when it turns itself off, you sit quietly waiting for the sound to come back on.


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Post subject: Re: Passport 500 Pro "Protect" mode
Posted: Thu Oct 26, 2017 12:45 pm
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ContraCaller wrote:
You are right. All the Fender Passports have protective thermal circuits. If the unit overheats, it turns itself off until it cools off, instead of burning out like a fuse, forever gone.

So, you need to either load the system less, so it generates less heat, or cool the system more so it dissipates the heat that it generates. The only third option is to use it without loading it less or cooling it more, and when it turns itself off, you sit quietly waiting for the sound to come back on.


It should not be overheating because #1, it is in a fairly cool room, and #2, I am not really stressing it that much. I imagine it would be shutting down all the time if I used it outdoors in the summer heat at concert volume. So I agree it is tripping due to thermal shutdown, but I don't think it should under the moderate conditions that I tested it.


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Post subject: Re: Passport 500 Pro "Protect" mode
Posted: Thu Oct 26, 2017 2:16 pm
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Aspiring Musician
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Joined: Wed Feb 16, 2011 7:24 am
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You said it's out of warranty. Old things fail to live up to previous performance. That's why warranties have an expiration date. Likely, either something in the unit is heating up more than it should because of internal resistance or resistance in connections between components, or less likely, the thermal unit is becoming oversensitive and cutting out before it should. There might also be a loose physical connection to a heat sink that now fails to suck heat away from a component.
In any case, old electronic things eventually fail, and it's usually heat that takes them out. Replacing the failing component, if you pay someone to figure out which component is failing and find a replacement, might give the unit new life, or replacing it with something newer is ultimately what you'll need to do.
I say that with empathy. Been there. Had to pay for that. It's good to be as Buddhist as possible and detach yourself from sources of pain.
The world of Sound Reinforcement is not Nirvana. We who make things loud ride the Wheel of Pain.


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