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Thread: Crate PA-B8350 Mains fuse size or schematic

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    Crate PA-B8350 Mains fuse size or schematic

    Aloha everyone i was wondering if anyone knows the correct mains fuse size for a 90's Crate PA B8350 Powered PA It came in without a mains fuse and circuit board does not indicate what size it should be I need to check the Bridge rec.. and the speaker mains out device that the speakers run through, sorry I dont know what it is called.. It is not here at my home ... It belongs to a church and has been blowing fuses only they dont remember what size it was LOL.... I cant find a schemo out there so i thought Id ask,, see if anyone knows or is familiar with this unit.... Thanks guys Peace BTW the 2,, 250ma fuses are fine

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    Lifetime Member Enzo's Avatar
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    Is the size of fuse not printed on the rear panel near the power cord?


    If you contact Loud Technologies, they should send the schematic.

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    Supporting Member Jazz P Bass's Avatar
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    Crate PA-B6350 Schematic

    The main fuse is listed as 6 amps.
    Is the fuse blowing under full power or at turn on?
    That 6 amp rating is for full power.
    A 1 or 2 amp should be fine for testing at low level.
    Attached Files Attached Files

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    Wow Thanks Jazz.. Enzo I did not see the fuse size by the power cord, I did look, nor was it printed on the circuit board The fuse is inside, no rear panel fuse on this. Jazz I do not know what is going on with it yet. It is not on my bench I had to go look at it for them I had enough time to open it up and have a quick look before the guy had to go. So I really did not test anything just looked it over for obvious problems... No fuse was in it and nothing looked burned or ugly . Thanks for the info I wont get to look at it again till next Tuesday.. I need to check the rectifier and it has what looks like some type of speaker protection device, looks like a small driver transistor that the main speaker outs are running through to the jacks. Thank you guys Im going to have a look at these pdf's Jazz.. What I was told is as soon as they power it on it blows the fuse..... Thank you again

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    Supporting Member Jazz P Bass's Avatar
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    Hopefully it is the bridge rectifier.
    Check it for shorts.
    Blowing the fuse at power up indicates a severe current draw.
    The output transistors banks should also be checked for shorts.
    The only 'speaker protection' that I see on the schematic is a thermal switch.

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