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DJM800 No power
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Miarka View Drop Down
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Joined: 01 August 2020
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Points: 3 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Miarka Quote  Post ReplyReply Direct Link To This Post Posted: 01 August 2020 at 5:43pm
Hey brendanssound!
By any chance were you ever able to find out if your fuse "B" reading was within tolerance?
I have the same symptoms and my fuse B has the same reading.
Any insight would be much appreciated.
Cheers!
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studio45 View Drop Down
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Points: 3864 		Post Options Post Options   Thanks (0) Thanks(0)   Quote studio45 Quote  Post ReplyReply Direct Link To This Post Posted: 02 August 2020 at 2:03pm
I would definitely suspect that fuse is blown or at least damaged - in any case, a resistance of 80 ohms (that may well be unstable and go even higher when significant current flows) in series with a low voltage power rail, is probably going to drop enough voltage that whatever is on the other side won't work.

Here's a datasheet for what I believe are the fuses you're looking at https://m.littelfuse.com/~/media/electronics/datasheets/fuses/littelfuse_fuse_437_datasheet.pdf.pdf

It states that the "J" fuse is rated for 1.25A, and should have a nominal resistance of 0.318 ohms.
Studio45 - Repairs & Building Commotion Soundsystem -Mobile PA
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Miarka View Drop Down
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Points: 3 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Miarka Quote  Post ReplyReply Direct Link To This Post Posted: 07 August 2020 at 4:13pm
Originally posted by studio45 studio45 wrote:

I would definitely suspect that fuse is blown or at least damaged - in any case, a resistance of 80 ohms (that may well be unstable and go even higher when significant current flows) in series with a low voltage power rail, is probably going to drop enough voltage that whatever is on the other side won't work.

Here's a datasheet for what I believe are the fuses you're looking at  https://m.littelfuse.com/~/media/electronics/sheets/fuses/littelfuse_fuse_437_sheet.pdf.pdf - https://m.littelfuse.com/~/media/electronics/datasheets/fuses/littelfuse_fuse_437_datasheet.pdf.pdf

It states that the "J" fuse is rated for 1.25A, and should have a nominal resistance of 0.318 ohms.


Thanks for the reply studio45! But Fuse "B" is rated for .125

https://www.littelfuse.com//en/_sheets/littelfuse_fuse_466.pdf

According to this chart fuse "B" should have a Nominal Cold Resistance of 4.0ohms.
My fuse "B" measures about 4.9 - 5.0ohms
Does that seem within tolerance?

Everything(apart from the display being completely dark) now seems to be working fine on this DJM800.
At first had no power but it looks like a partly pulled out flat connector was to blame.




Edited by Miarka - 07 August 2020 at 4:32pm
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