A buddy of mine pulled his Stryker out of storage, and the fuse instablows. He said there were no issues before. Anyone know the likely cause? He can't afford to send it in for repair so I was thinking of trying to help him out.
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955hp blowing fuse
- Thread starter 338_MtRushmore
- Start date
"Instablow" almost has to be the reverse-polarity protection diode.
Almost. A simple thing to check first, at least.
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Almost. A simple thing to check first, at least.
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It was in his house so I doubt it moisture. I was thinking that the protection diode blowing just made a dead radio, but it's been a long time since I blew one. I'll have him take a pic of that area.
The current rating of a protection diode is nearly always lower than the current rating of the fuse for that radio. If you get the polarity backwards, this pretty well guarantees the diode will get more current through it than it's rated, before the fuse can trip and shut it down. This makes that diode a one-time protector. Usual way the diode fails is to become short circuit.
That's where the odds point to, not knowing any more about where it's been or how it's been treated.
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That's where the odds point to, not knowing any more about where it's been or how it's been treated.
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Any chance someone could find the protection diode for me? Without the radio in front of me, I haven't a clue. Pretty please?
http://www.cbtricks.com/radios/stryker/sr_955hpc/graphics/Schematics.pdf
http://www.cbtricks.com/radios/stryker/sr_955hpc/graphics/Schematics.pdf
I'm thinking D501 in the circle? Looks kinda funny, but requested a better pic. Not really the area I expected to find it, so its probably not it anyways.
In a word, no.
Follow the two wires from the power socket. First thing they connect to on the circuit board should be adjacent to a black epoxy body rectifier diode. The banded end will be connected to the positive wire from the power socket, usually red.
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Follow the two wires from the power socket. First thing they connect to on the circuit board should be adjacent to a black epoxy body rectifier diode. The banded end will be connected to the positive wire from the power socket, usually red.
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So it is the big diode on the back of the power socket I assume? Do those go bad without any physical indication?
They almost never look bad when they fail.
Until someone bypasses the fuse and explodes it.
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Until someone bypasses the fuse and explodes it.
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Ok, I'll have him bypass the fuse to confirm. Seriously though, it has to be the diode. He said it blows the fuse with the radio off. Then again it does have some sort of lighting installed and there is a wire from the positive going to a switch on the cover. God only knows what that mess is, but it's either shorted diode, or shorted wires for the lights.
Not really. The short is either inside the diode or outside it. But even if the diode is okay, the short is in parallel with it. Can't test a good diode with a short circuit around it.
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That's what I thought. I have always just desoldered to avoid any other interference because its foolproof. I'll try to have him desolder one side and test. Thanks for your help yet again nomad
