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Post by Valdu on Jul 1, 2024 9:48:29 GMT -5
Hello, Does anyone have the electronic diagram of the panel board of the ddrum 4 module, or could tell me the values of fuses F1, F2, F3, etc... ![]() ![]() located just after the pad jack inputs? The F1 fuse which corresponds to the kick input seems to have blown on one of my modules. Any information will be welcome, thank you! |
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Post by Valdu on Jul 1, 2024 9:56:33 GMT -5
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Post by kenjwright on Jul 1, 2024 12:11:48 GMT -5
Hello, Does anyone have the electronic diagram of the panel board of the ddrum 4 module, Hi Valdu , Here is a post that provides a Dropbox link to service information, including the panel board schematic. The fuses are shown on the left side of the sheet but I don't see a value noted. Cheers! Ken |
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Post by Valdu on Jul 1, 2024 12:33:41 GMT -5
Thanks, Ken!
The schematic will be usefull to me!
These fuses are strange, they've got three pins, and one connected to the ground... Can you explain that ?
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Post by kenjwright on Jul 1, 2024 13:37:28 GMT -5
I'll admit that this is just a guess based on my very limited knowledge  but take a look at this similar item on DigiKey. It would seem to indicate that the ground is part of the "soft start" circuitry. Again, just a guess. Cheers! Ken |
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Post by Valdu on Jul 1, 2024 16:08:59 GMT -5
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Post by kenjwright on Jul 2, 2024 0:19:43 GMT -5
Hard to know without full specs for the original, but maybe. Looking at the specs for the item in your link it seems that these are like a digital smart fuse that throw a switch rather than the convention filament that just burns up. Seems reasonable in an integrated circuit. The Clavia pads do not generate much voltage (less than 5vac?) so not sure what the upper protection limit should be for the fuse. Maybe thierry has some knowledge of these. Question though, did you check the input voltage at each end of the fuse to verify that the voltage is present at the input end but absent at the output when a pad is struck? It could be the jack itself that is problematic. Just a thought. |
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Post by Valdu on Jul 2, 2024 1:36:50 GMT -5
I checked with an ohmmeter when the module was off. The resistance is infinite across fuse F1, one or two ohms across the other fuses.
When the module is on, you can check the kick sound with the button, but the signal from the piezo sensor does not arrive, so you can't hear any sound by hitting the pad. I checked the pad and the continuity of the signal up to this fuse F1.
Could this device be used to protect the piezo sensor, when you turn on the module or when you hot plug the jack? I've noticed that on the ddrum3 panel board schematic, there are no input fuses.
I'm going to check the voltages later, but I only have a multimeter.
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Post by kenjwright on Jul 2, 2024 2:32:31 GMT -5
That infinite reading is certainly suspicious. If the voltage test fails then I suppose the fuse could be removed and replaced with a solid wire just to test if the signal came back. Seems rather low risk.
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Post by Valdu on Jul 2, 2024 2:53:58 GMT -5
That's exactly what I was thinking about, to short circuit the fuse...
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Post by Valdu on Jul 2, 2024 6:37:38 GMT -5
Bingo!
I removed the fuse and soldered a small copper wire that joins the two end contacts and passes over the center contact, and now it works.
Maybe later it will be better to find a compatible fuse to replace the copper wire...
Thanks Ken for the advice!
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Post by thierry on Jul 3, 2024 16:03:09 GMT -5
Hello,
These are not fuses but coil inductances.....you can replace by a wire without problem....
They are used to limit high frequency response on the input (low pass) to remove unwanted parasitics signals that could false trigger the channel....
Thierry EPPHERRE
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Post by kenjwright on Jul 3, 2024 17:46:35 GMT -5
Awesome information! Thank you thierry! |
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Post by Valdu on Jul 4, 2024 2:45:28 GMT -5
Hello, These are not fuses but coil inductances.....you can replace by a wire without problem.... They are used to limit high frequency response on the input (low pass) to remove unwanted parasitics signals that could false trigger the channel.... Thierry EPPHERRE Merci pour l'information,Thierry! ;-) |
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Post by Valdu on Jul 4, 2024 6:10:30 GMT -5
I keep asking myself questions about these components:
Why do they have three contacts, one of which is connected to ground? Coil inductances usually have two.
Why are they labeled F on the circuit, rather than L, which is the standard reference?
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but take a look at this similar item on 