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psarkissian

Service Engineer Moderator
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Posts posted by psarkissian

  1. Rechargeable batteries,... use caution!

     

    Certain older CMOS chips do not like rechargeable batteries. In

    certain CMOS input/output circuits in some older chips, if the volts

    go down beyond a certain point, the current tries to go through the

    CMOS elements in the opposite direction (as if there were a negative

    bias on the chip, which digital chips in general don't want to see) and

    the chip looses it. It's rare, but it happens.

     

    I don't recall if that was the case with earlier Variaxes (like the 500).

    But it would explain the owner's manual not talking about rechargeable

    batteries and only mentioning alkalines. And it's probably why we never

    use anything but alkalines with older Variaxes here in the repair area.

     

    So,... rechargeable batteries,... use caution! Please.

  2. It's for the Line 6 authorized service techs.

    We can't vouch for the abilities of people outside of that. 

    Having it done by an authorized service tech means the warranty won't get voided.

     

    And,... certain aspects of the set-up are such that, if it's not done right,

    the peizos might pick-up something, that when it goes through processing, 

    runs the risk of producing artifacts in the audio (like whistling howls or warbling).

     

    Set-ups on guitars with active electronics have their own pitfalls and traps,...

    unlike guitars with passive electronics. It's not our grandfathers Gibson archtop.

     

    If I had a dollar for every time someone sent me a JTV for set-up issue, after

    telling me that they of their tech could handle it,... I could retire a rich man.

     

    We can't vouch for the abilities of people outside the Line 6 authorized service techs.

    And doing anything that changes the functionality of the device, runs the risk of

    voiding the warranty (and I don't want to see you void the warranty).

  3. A reminder about 1/4" guitar cables when running from batteries (or XPS power

    supply),... use a TRS (Tip/Ring/Sleeve) guitar cable [page-5, JTV Pilot's Guide,

    under 8- Battery Compartment]. It works better that a TS (Tip/Sleeve) cable.

     

    TRS uses the battery, signal and return lines.

  4. Line-6-user,... the longer cable is a 25ft VDI, has the XLR like casing on both ends of the cable,

    and as far as I know come separately as an accessory. This is the cable used for playing through

    when using the floor effects (XT, X3 and HD series). 

     

    "... the HD500 as an interface for JTV updates, use the JTV Interface widget. ..." A simple WARNING

    message during the updates would safeguard this"----  

    When updating, there is usually a message that comes up to unplug other USB devices. That way,

    the device being updated can be isolated for update without data crosstalk from other devices.

     

     

    Recap--- Update the JTV separately using the USB interface widget that came with the JTV. Use the

    25ft VDI cable (with the XLR shroud casings on both ends) for playing the instrument through the HD500.

    Do not use the shorter cable, it's for using with the USB interface for updating the JTV.

     

    Also, check the Knowledge Base section, looks like some good tutorials in there on HD500's.

  5. There is a short VDI for doing updates only with the Interface widget

    that comes with the JTV, (one side with shroud casing, the other not).

    It's not for using as a VDI for the HD500 for playing thru.

     

    The longer VDI cable is for playing thru (shroud casing on both ends). .

     

    Updating the HD500 with the JTV plugged in may not being a good idea,

    update the HD500 and JTV separately.

     

    If you are trying to update the JTV to Flash v2.00 or higher, do not use

    the HD500 as an interface for JTV updates, use the JTV Interface widget.

  6.  
    Right,... no voodoo involved in set-ups.
    Just have to do it right and be aware a few things.

    The specs for one,... the authorized service centers will have access to service info,
    and the set-up specs and procedures.

    For another,... the distance between the pick-ups and the strings. When the Models
    are engaged, if the distance between the pick-ups and strings aren't correct, the
    magnetic pull from the pick-ups can cause a warbling effect which gets picked up
    by the piezos. And it's an awful sound. Something you don't deal with when it comes
    guitars with passive electronics.

    And things like that. So it's good to take it to an authorized service person who has
    done a few JTV's. And yes, I have done a few JTV's.


    This isn't our grandfather's GIbson archtop with passive electronics anymore,...
    it's a different kind of cat,... so you have to cuddle this cat under the chin just a
    little differently. There are the usual things to be aware of with guitar set-up,...
    and some of the not so usual stuff as well.

     
  7. The thing with fret buzz is that it can occur in different places on the neck, 

    depending on how the neck relief is set. Eliminating fret buzz is a balance

    between neck relief and string action height.

     

    Pick-up to string distance can also play a role when the Models are engaged,

    though that doesn't seem to be the case here.

     

    More than likely in your case, it is burrs in the nut slots. If de-burring the nut

    slots doesn't help, then maybe it may need a new nut. A Line 6 authorized

    service center would be able to get one, or online through Full Compass

    (search: jtv-69 nut) on their website.

  8. vpera,

     

    Sounds like a combination of a slight fret buzz and looks like a few burrs

    in the nut slots. Recommend getting the nut slots de-burred and the set-up

    checked and dialed-in just a little.

     

    Also recommend a Line 6 authorized person in your area with JTV experience.

    Yes, logging a ticket would be good.

     

    Reminders- register the product, log a ticket, use a Line 6 authorized service center.

    Things go so much more smoothly and efficient that way for you.

  9. Have your local Line 6 authorized service center that does guitars have a look at it,

    it may just be a set-up or alignment issue.

     

    Set-ups are checked at the main distribution point. However climate at a given location

    can have an effect on the set-up. Since they don't know where a guitar is going to at that

    point, the set-up would be done to the specifications and not the location of the end destination.

     

    However, when I do repair or service a guitar, I adjust the set-ups for the end destinations.

    Sometimes it's needed that the local tech may need to dial it in that last smidgeon.

     

    When a guitar arrives, it's good to play it and give the set-up 2-4 days to acclimate to the

    end destination where you're at. Then, if needed, go to a local guitar tech for that last final

    smidgeon of adjustment.

     

    2013 necks have the most recent current neck specs.

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