Conference napalm::guitar

	Take it apart and resolder the connections on the PC board. Electro
Harmonix was known to have some of the worst soldering/workmanship of any
stomp box on the market. I've resoldered dozens of them & have them return
to life again. this may take you a while, but it's worth it. If you've never
soldered beforem get someone who has to help you, or do it for you - 35 watts
or less for the soldering iron's power, and use only ROSIN core solder.

								JEns

	> Take it apart and resolder the connections on the PC board.

	Good idea.  I was going to open it up and check the footswitch
	connections also.

	/ravi

    Just for da record, the New Sensor tube co is run by Mike Mattews,
    who started EH.  He'll send anybode schematics if the ask, more so if
    ya buy some of his nifty tubes.
    
    Jay Tashjian, awaiting the axe...no longer..bye-bye.
    

	Do you have an address or number?

	/ravi

Thought I'd slot this in here, although it's a query about repairing an
electronic tuner rather than an effects unit in the real sense of the term.

My Quartz Matrix electronic tuner has suddenly seized up on me. I've only had
it a few months but the dial remains immobile when I plug the guitar in,
regardless of the string that I'm attempting to tune. I've tried changing the
battery, but that doesn't appear to be the problem. All of which suggests that
there might be something loose inside and that there's a bit of soldering to be
done. 

Is this a home repair job or should I take it to a professional? Apart from the
fact that I am to soldering what Attila the Hun was to architecture (I'd
probably ask my brother-in-law to do the business), I was wondering whether
soldering is advisable? I would have thought that electronic tuners are fairly
delicate devices, and I wouldn't want to compromise its ability to give me a
correct reading in future (though it might do wonders for my guitar playing!).

Incidentally, the Quartz Matrix is certainly one of the cheaper models on the
market, but my impression is that this is because it's a bog standard durable
guitar tuner, without the flashing lights or calibration facility of more
expensive models.

Anyone else had similar experience with guitar tuners or can offer advice?

Thanks,
  Dom    

re: .5

It's kind of sad, but I expect you'd probably end up paying the repair
dude more than it would cost to replace the tuner.

-Hal

    Given Hal's theory (which I agree with), you might as well open the
    sucker up and have a look. There may be something obvious. If not,
    take a standard number 2 pencil with a good eraser and, holding the
    pencil by the writing end, start tapping around with the eraser while
    feeding a signal to the unit. See if the needle jumps and comes to
    life. Even temporarily. If it does, tap around until you can isolate
    the bad solder joint. Don't laugh, I've fixed everything from my DEP-5
    to my mixer to stereo amps using techno-tapping.
    
    There's a 99% chance you have a problem that will cost less than $1 to
    fix. The problem is finding it.
    
    Edd

If this is only a few months old, is there a warranty that would cover
the repair?

Geoff

    I might mention I have two Matrix tuners.  I only paid $5 each so I
    wasn't too bothered when one went belly up, much as you have described. 
    I did try some resoldering (the solder work is pretty poor) and that
    seemed to work for awhile, but it eventually went south totally.  I
    wouldn't buy another one, that's for sure.
    
    You have nothing to lose by opening it up and futzing with it.  Pay
    attention to the connections near the input jack, the meter and the
    string selector.
    
    							brian

    Thanks very much - a whole lot of helpful answers there. I'll see what
    can be done with a soldering iron!
    
    As regards the warranty, I purchased the unit back in the UK this
    summer so unfortunately, it's not a lot of use.
    
    Dom