Tuner issues

[The_Armadillo]

A while back, the guitar player in my band (I play bass), picked himself up a Planet Waves tuner. He liked it and it tuned well, but for some reason he was plugging 9v into the jacks labeled '9v in' and '9v out'. It doesn't work anymore for some odd reason... It still turns on, but it just doesn't tune at all. Any ideas what the problem could be before I pop it open? This is my first post, so please be nice...

[The_Armadillo]

No one?

[jefe]

If he was plugging 9v in to the "9v out" jack, it's possible he could have fried something.

[earthtonesaudio]

The (scant) info on these tuners suggests the two 9V jacks are for daisy-chaining and probably are only connected in parallel.  That would imply the chance of frying anything by using the "wrong" jack is nil.  However I have not seen inside one to confirm.

[Mike Burgundy]

Does it pass sound? Is it still under warranty? (!)
The 9V out is usually parallelled as earthtones just said, so it's unlikely that screwed something up. Is it possible the wrong polarity was used, or AC instead of DC? Then again, that would probably leave the pedal totally dead.

[waltk]

I usually use mine on battery.  I've notice that when the battery gets low, it doesn't tune.
You should try it with a fresh battery (and no power adapter plugged in).
Also, the problem might be unrelated to power.  Does it pass signal through?  Is the volume on the guitar turned up?

[petemoore]

  I have all kinds of ideas what the problem or problems could be, that is the problem. It's all about the process of elimination.
   If it lights then it is now getting the correct polarity power.
  If it stopped working after some 'power supply confusion' [AC, DC of both inversions are possible to connect through their common sized jacks, and only one of the three could make it work], sorting out what got plugged in the 9vdc jack would help.
  ...Cruel to be kind is still nice...I've had experiences with little SMT [and other] tuners which quit working...I spent a little bit of time on the 'regular stuff' where possible [SMT makes it hard to even see what might go where, much less measure anything, even less make a connection], the best results included repairing a battery clip on one of them.

[The_Armadillo]

As far as I can see, the tuner is true bypass, so it does pass signal when it is bypassed. It does turn on and try to tune, but it just registers that there isn't any input signal to tune. I have found that for some reason if you stick a booster in front of it, it actually registers input but cuts in and out on registering it. Sorry for the late reply, I've been freaky busy.

[The_Armadillo]

Also, I have no idea where he got it, so the warrantee might still be good. I should check into that.