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JTV-69 Volume Control malfunction?
by jamhr001 on 2013-04-16 14:35:32

First post (I think, or at least in a very long time), so here goes.  I don't know what to call this situation so I will describe it.

The JTV-69 (SSH version) battery is out, just using magnetic pickups.  (New guitar, battery is charging - taking forever!)

Anyway, the pickups sound good, but very bright, and a little different.  I lower the volume and to about the half-way point, it all works as expected.  Volume goes down.

Then, it levels off, then approaching the zero setting, the volume goes back up, only now I'm fairly certain I am hearing the piezo pickup rather than the volume.  It's about half the level of the mag pickups on full.

Can anyone tell me what's going on?  Is this normal?  Wouldn't think so.  Everything I could find in the handbook about volume talks about the models.  Haven't even gotten there yet.

Thanks in advance!



Re: JTV-69 Volume Control malfunction?
by jamhr001 on 2013-04-16 16:24:08

So a little more info - there is very loud 60-cycle hum coming.  Also spoke to tech support - could be a bad pot, or a bad board but something isn't working properly.

Bummer.



Re: JTV-69 Volume Control malfunction?
by jamhr001 on 2013-04-17 09:24:56

Latest update - on the advice of L6 support I attempted a reflash.

Monkey did not show the guitar connected, although the USB/CAT5 unit was lit (green to USB, red flash to CAT5 side).  Tried reseating several times.  Instructions were followed.

The original volume problem was noticed when the battery was either out or an un-charged (completely dead) battery was in.  After the attempt to reflash, the volume issue went away!  I now have properly functioning (if not confidence inspiring) volume control.

Major victory, my JTV-69 volume control now works properly.  Celebrate accordingly.

But now the battery is fully charged (two of them, actually) and the Guitar Model Selector is completely unresponsive.  No indicator light, no audible models (or retuning), nothing.   At least the mag pickups remain engaged and fully functioning.  (A partial victory! Celebrate accordingly.)  Tried two different batteries now - each time I heard an actuator switch click.

So a ticket is open, waiting for the sales guy at the dealer to show up so he can advise whether to go thru store or I'm better off going directly thru L6.

Gotta say, my initial excitement at getting the JTV-69 is somewhat dampened.  Friends who warned me about certain reliability issues so far sparing me the "told ya so's."  (Consolation prize.  Celebrate accordingly.) This is depressing.



Re: JTV-69 Volume Control malfunction?
by jamhr001 on 2013-04-17 18:32:56

Update.  (Is anybody out there?  Makes a good journal of this issue if nothing else.)  Tried Techniserv, a local repair place in NJ.  They said, "We don't work on the guitars, they should know that." Called Dave's Sound, they said they had no information on the guitars.  Tried Triple S, they don't respond to voicemail, apparently.

--

Latest news - The models are now working - major victory.  What was the problem?  The Guitar Model Selector knob is apparently not a good fit for the guitar and if it's pushed down too far, it prevents the down/up button from traveling the full range it requires.

I had a hunch there might be some life in this thing when the initial attempt to reset the models (middle pickup position, hold down the selector and plug in the 1/4 inch cable) caused both model and tuning selectors to blink.  They didn't stop blinking until I removed the cable, and it only worked that once. But that put me back on Google where I found another thread and there was the answer.  At least part of it.

http://line6.com/support/message/407239

So">http://line6.com/support/message/407239">http://line6.com/support/message/407239

Sothe models and tunings are working and all's well until I tried once again to connect to the computer (Mac Pro 2010 2.8 GHz Quad-Core Intel Xeon, 16 GB of RAM - lots of juice) and Monkey only sees the USB interface, and only occasionally.  I get the yellow triangle with  Unknown under installed.  This was working fine yesterday, so we're still in the twilight zone on this guitar, but making progress.  Celebrate accordingly.

Line 6 Monkey and Variax Workbench are both up to date, with green checks.  Reinstalling Monkey to see if that helps.  I should be working on tunes right now, not on a computer science project.

--

New edit - re-installed Monkey and now have a green check next to USB Firmware (1.03), but it's still not seeing the JTV-59.  Very small progress. Maybe I'll try reinstalling Workbench since it didn't requre the reboot this time for Monkey.

Currently Workbench only allows me to add Tyler Variax in offline mode.  I can add as many as I like.  One new difference - it's not seeing the USB interface this time.  All the other times it was there on the list.

--

New edit - this one was my fault.  Forgot about the 1/4 inch jack in the firmware upgrade (reflash) instructions.  Tyler Variax update successful.  First I'm gonna play it, then I'm gonna have a beer.

--

So what's weird is now the Flash memory says 1.90 and give me the green check, but the USB (interface) firmware is still a yellow triangle: "This item is installed, but its version could not be determined."  Both LEDs are still green.

--

I wonder how many times this board permits edits.  Anyway, a restart of Monkey gives me all green lights.  I start Workbench, still doesn't see the Variax.  Probably doing something else wrong, but I wish there was more contextual guidance (is if there were any) through this process.

--

So I've closed and re-opened Monkey (all green now) and Workbench (No Device Configured), and Workbench ONLY allows me to set up a Variax guitar in offline mode.  1/4 inch cable is plugged in.  Refresh does nothing.  Little dialog boxes, tiny print, don't make it any easier.

Reviewing http://line6.com/support/docs/DOC-1643

--

Reflashed">http://line6.com/support/docs/DOC-1643">http://line6.com/support/docs/DOC-1643

--

Reflashedagain, 1.90, as I was told sometimes it helps.  Still no go with Workbench.  Monkey sees the guitar but Workbench doesn't.  Kinda seems like this thing just doesn't want to make it easy.  Call me superstitious.

Looked for a Workbench manual thinking, maybe I'm missing the key procedure here...

Variax Workbench Manual - Please refer to the Help menu in the Workbench program.

So, no help there.  And there is NO HELP MENU IN WORKBENCH.  Pretty funny Line 6.  Jokes on me, right?  There is a really funky orange and maroon connection guide to make sure the cables are right.  What else would we possibly need?  What could ever go wrong?  So that is no help because the cables are triple-checked, and the same connection that UPDATED THE FLASH MEMORY is the one that does not seem to help Workbench find my JTV-69.

At a loss.  Crazy stuff.  There will be no celebration tonight, even though the models are working.  One reason is that I do want to use the mag pickups and the models are at least 3 times louder than the mags.  Is that another undocumented feature?  Probably in the Workbench Help menu somewhere, if there was one.



Re: JTV-69 Volume Control malfunction?
by jamhr001 on 2013-04-18 13:44:34

So in the end, it was the Guitar Model Select switch, and a little bit of impatience on my part, and the failure of Line 6 to recognize and (not document but) trumpet an obvious design flaw in the JTV-69's GMS switch, that caused all the frustration.  Too tired to celebrate.

The switch can be pressed down too far, at least on my guitar and one other, and this apparently causes something not to fully release, some switch to fail to open or close as it should, which acts somewhat similar to what might happen if your computer keyboard had a Return key stuck in the depressed position.

As for the problem with Workbench, it seems that I need an XPS-DI, a little alumnum box that allows you to route DC power via the 3rd conductor in a TRS cable.  This is sold, if it can be found (no longer in production) for the astonishing price of $100 - more with tax and shipping.  Why it's called a "DI" I'm still not clear on.  DI's I typically use have transformers, and you can find a passive DI for $40 or $50, if you don't get too fancy.

So I'm trying to get it to work, thinking the ancient looking instructions (though accurate, and pretty well laid out if you can stand the colors) must refer to 1st generation Variax gear.  Couldn't possibly refer to my Tyler JTV-69. 

Then again, I have an HD300 and, what the H, there is no Variax input.  HD400 either!  You have to by the HD500, or put out $100 more for... what?  DC power??

Wow.

Anyway, the acoustic sounds amazing through my JBL Eon powered 15.  Some of the electric models have potential, and the pickups are no longer 1/3 the output of the models - they WERE, but now they aren't.  No idea why. 

Silver lining, I have a POD XT Live that I was able to take out of mothballs, though it seems ridiculous that I'd have to use that much gear just to get Workbench to work, it's better than spending another $100.  For now at least because it's been sitting around here too long.  Need to sell it and find an alternative power source.

It's love/hate with Line 6, gotta say.

Any of you crickets know if Line 6 has a washer or at least a suggestion on how to keep the GMS switch from going too low? It does happen after time with normal use.  At least I know how to fix, but eventually it will loosen if I keep moving it this way. 



Re: JTV-69 Volume Control malfunction?
by snhirsch on 2013-04-18 14:43:44

jamhr001 wrote:

So in the end, it was the Guitar Model Select switch, and a little bit of impatience on my part, and the failure of Line 6 to recognize and (not document but) trumpet an obvious design flaw in the JTV-69's GMS switch, that caused all the frustration.  Too tired to celebrate.

The switch can be pressed down too far, at least on my guitar and one other, and this apparently causes something not to fully release, some switch to fail to open or close as it should, which acts somewhat similar to what might happen if your computer keyboard had a Return key stuck in the depressed position.

(snip)

Any of you crickets know if Line 6 has a washer or at least a suggestion on how to keep the GMS switch from going too low? It does happen after time with normal use.  At least I know how to fix, but eventually it will loosen if I keep moving it this way. 

I find it incredible that this problem persists in production instruments.  It's not that something fails to release, though.  The problem is that if the knob slides down too far on the control shaft it (the knob) will physically bottom out before pushing the shaft far enough to engage the model/magnetics switch.

Line6 should consider making a re-tooled knob available for folks (like myself) who've seen this issue.  In the meantime, pull the knob off gently, drop a little circle of cardboard (about 1/16" thick to start) in the hole and carefully push it back on.  Exercise it a few times.  If it's still intermittant, pull the knob off and add another shim.  If two of them don't do it, you may have other problems with that instrument and should contact Line6 for a warranty repair.



Re: JTV-69 Volume Control malfunction?
by jamhr001 on 2013-04-18 20:59:52

Thanks!




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