I built a Klangmaschine and it works perfectly in my Intelljel test case. However when I put it in any of my 3 Arturia racks only the left channel works. I switched the module forth and back and the behaviour seems to be consistent.Any ideas?
Re: Alstaden Build
Hi friends: After what I felt was a pretty straight-forward build (Jacks, Pots, Sliders, Switches), I got magic smoke at CAL_SHAPE_2A during testing. Im not seeing shorts or bridging on immediate inspection and SMD was pre-populated so Im not sure where to go without a schematic.
ty
Hey Brian, The area around CAL_SHAPE_2A definitely looks damaged. Good to know you've already checked the power header for shorts.
CAL_SHAPE_2A is a 10k trimmer connected between +12V and -12V, so it should not get hot under normal operating conditions.
I'd suggest checking a few more things:
Check the resistance across the two outer terminals of CAL_SHAPE_2A. It should be approximately 10k. Compare it with CAL_SHAPE_1A, which uses an identical trimmer arrangement.
I'd also recommend thoroughly cleaning the PCB with isopropyl alcohol and a soft brush to remove any flux residue or solder debris, especially around the power header and CAL_SHAPE_2A. Avoid getting IPA inside the pots, sliders, and trimmers, and let everything dry completely before further testing.
I also noticed something suspicious around D16/D17. It looks like a scratch or possibly an unintended solder connection. Could you inspect that area closely and check for damaged traces or shorts with a multimeter?
Since CAL_SHAPE_2A appears to have suffered significant heat damage, it will most likely need replacing. The PCB underneath should also be inspected for damaged traces or carbonized material. After desoldering, check for shorts again! I might be a connection underneath the trimmer.
Please don't power up the module again until we've identified the cause.
Cheers,
Stefan
Hello,
I have four Boba Fat modules (one is pre-assembled—it works, too) and eight HH modules (one is pre-assembled—that one works as well).
The last two are still in need of repair.
Is there anyone who can repair these modules?
I guess I’m just not cut out for this (even though I have a background in electrical engineering/IT).
Please let me know—thanks in advance!
I am having some weird functionality with Hanz, lfo and CV led are default on, lfo led blinks at max rate and the resonance pot affects the rate. The cutoff pot does nothing. I have reflowed everything and I am still having issues. Is there a schematic for the module so I could do some debugging?
I actually figured out the issue. The schottky diode on the negative voltage rail was not fully soldered. Fixed that and now everything works perfectly. Weird things happen when you don't have negative voltage
Hey ch,
That's an interesting issue, especially since KLANGMASCHINE works perfectly in your Intellijel case.
Both FM voices use separate but identical microcontrollers, so I'm wondering whether the right-hand oscillator might have trouble starting up with the Arturia power supply.
Could you try a few things?
Test the individual outputs: Is the right FM voice completely silent at its own OUT jack, or is it only missing from the MIX OUT? Please use the same patch cable and mixer input for both tests.
Test KLANGMASCHINE alone: If possible, disconnect the other modules from one of your Arturia racks and see whether the problem persists. This would help rule out a power supply load issue.
Try another power cable: Have you used the same ribbon cable in both cases? If so, please try another one and a different power header in the Arturia rack.
Check the startup behaviour: Does the right oscillator ever start working after switching the Arturia rack off and on again?
KLANGMASCHINE generates its own 5V supply from the +12V rail, so differences in the power supply or its startup behaviour might be relevant.
Let me know what you find, and we can narrow down the cause.
Cheers,
Stefan