Hex problem

Q & A for building and interfacing your rack gear with Ground Control Pro and GCX-based systems.
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bluefalcon
Posts: 6
Joined: Thu Nov 25, 2010 3:02 pm

Hex problem

Post by bluefalcon » Mon Nov 06, 2017 6:32 pm

I've had my Hex for about a month now but the last couple of days it has become unusable due to massive tone/volume loss whenever it's in the signal chain.

The best way I can describe the problem is, it's almost like when the battery is dying in an active guitar ie. zero sustain and "fizzy" (and yes, i've checked the battery :D ), accompanied by the volume loss.

If I take the Hex completely out of the path, everything sounds like it should but as soon as I bring the Hex back in, the problem reappears.

I've tried different guitars, cables, removing all pedals from the loops, going straight in and out of the Hex to the amp etc and all with the same tone/volume loss result. The unit still functions as it should in regardless to midi and loop commands but I am at a complete loss as to what is causing the sound/volume issue? Something loose internally? Faulty unit?

Any help would be greatly appreciated.

JohnClark
Posts: 7121
Joined: Tue May 05, 2009 2:33 pm
Location: The Lab

Re: Hex problem

Post by JohnClark » Mon Nov 06, 2017 6:58 pm

I suppose you can test at least the two possible signal paths in the HEX using a pair of known to be good cables.

Test #1 would be to plug your guitar directly to Loop 1 In, then take Loop 1 Out directly to the amp.

Test #2 would be to use the same cables, but with the guitar directly to Loop 2 In, then take Loop 6 Out directly to the amp.

If both tests sound the same, check the cables again ;) then check that the power supply is working correctly. HEX should be good with 9VDC @ 100mA.
If only Test #1 fails but test 2 works... stop using a 100' cable? (I don't actually expect this to be possible if this exact setup used to work and nothing else changed)
If only Test #2 fails, you can disable the Output Buffer to see if it has somehow died.

The Output Buffer is disabled by opening up the HEX chassis (two #2 Phillips screws on top, and two on the bottom) and removing the cover that is the Top and Front panel portion of the chassis. There are a pair of jumpers located in a notch in the upper circuit board. The HEX ships with these jumpers in the "Quiet Switching" position. Move the two jumpers from the "Quiet Switching" position to the "True Bypass" position. Replace the cover and try Test #2 again.

Of course if the Output Buffer is dead, we will gladly fix it. Also, if you would rather not open up the HEX, we will gladly inspect it and fix whatever may be wrong. The two tests should tell us where to start at least.

I hope that helps!

bluefalcon
Posts: 6
Joined: Thu Nov 25, 2010 3:02 pm

Re: Hex problem

Post by bluefalcon » Mon Nov 06, 2017 7:05 pm

Thanks John. I will try all those suggestions and report back.

Update:

Test 1 worked
Test 2 failed

I removed the cover and changed the jumpers as suggested (Quiet > True) and that worked. Tone/Volume was back to how it was previously (just like test 1).

JohnClark
Posts: 7121
Joined: Tue May 05, 2009 2:33 pm
Location: The Lab

Re: Hex problem

Post by JohnClark » Tue Nov 07, 2017 11:01 am

OK, so that suggests that the Output buffer has somehow been compromised. Feel free to give us a call or write to info@voodoolab.com to arrange for a repair on this.

The way you have it now is 100% true bypass, with no buffer circuity in the signal path. This is perfectly fine to use this way. Having the buffer engaged (well when it works! :oops: ) is mainly to help minimize the potential pop that a true bypass switch can have in some rigs. You may decide that you would rather not use the buffer, but we would still like to repair it for you should you want to turn it back on.

Sorry for the trouble!

bluefalcon
Posts: 6
Joined: Thu Nov 25, 2010 3:02 pm

Re: Hex problem

Post by bluefalcon » Tue Nov 07, 2017 12:59 pm

Excellent, thanks John. I have sent an email.

And yes, since changing the jumpers I have noticed a slight pop when engaging the loops.

Bartman
Posts: 1
Joined: Tue Dec 19, 2017 1:07 pm

Re: Hex problem

Post by Bartman » Tue Dec 19, 2017 1:50 pm

I was having the same problem and discovered this thread. I tried the procedures with the jumpers and it solved my problem as well. Thank you! I was close to trying to find a repair facility.

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