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'4 Stuck in Booting Up Loop

I've had occasional recurring power supply problems. Sometimes the unit will randomly reboot while I'm using it. Sometime I'll power it up and it will go \"Christmas tree\" on me, meaning every light comes on and it just sits there like that until I power it back down. When these things happen I take it to a friend of mine who will open up the unit and make sure everything is clean and tight. Then it will work for a while. Tontight it starts to boot up, then after it displays the software version (1.1) it turns off and repeats.

I've tried a new, compatible power supply. I haven't messed with the AC plug on the unit.

Any suggestions? Thanks.

Comments

  • Sorry to be redundant, but be SURE that the power adapter you use provides AC current, NOT DC.
    It's also possible you've got some sort of short or PCB problem inside. Unit been dropped, hit, yada, lately?
  • Power supply is AC. But never hurts to confirm the obvious.

    Took the unit to a guy who's very experienced in fixing electronic music gear. He opened it all up and examined it without finding any problems. He made sure everything is clean and fully seated. It works fine now. But it has a history of this sort of problem. Actually, another thing it's done in the past is randomly reboots after I've hit a loud chord on the guitar. So sometime it seems related to a large amount of input signal.
  • Seems related to the old ribbon connector problem. I have also seen a few units with dry electrolytic caps in the power supply. Not too many but the problem creates a recycling as well.
  • thanks I too have had this issue for years making the gnx4 useless poking aroung I found the ribbon cable with the slightest nudge causing the fault to occur
  • Thanks for the follow up. I'll look into the ribbon connector.
  • I'm told that Mackie had a ribbon connector problem on one of their products and they replaced it for free with a gold connector. I don't suppose Digitech has offered something like that?
  • \DigiAx\ wrote:
    I'm told that Mackie had a ribbon connector problem on one of their products and they replaced it for free with a gold connector. I don't suppose Digitech has offered something like that?

    ha ha ha ha ha ha ha (thump). [that was me laughing my head off!]

    Dude, seriously. Why would they do something like that for an ancient product like a GNX? It would be lovely but do you really expect they would?

    -rf.
  • \rawfish\ wrote:
    ha ha ha ha ha ha ha (thump). [that was me laughing my head off!]
    Jeez...that was about the funniest thing I've read in ages. I will now clean the coffee off my screen.

    But DigiAx...I'm afraid he's right. DT not only abandoned the GNX concept ages ago, but I'd be willing to bet that support for it has been pared down to paid service - and who knows how long that'll last. Can you imagine sending your RP1 to them and asking them to service the PCB??? :roll:
  • I actually have an RP1, and sadly it's more dependable than the 4.

    Yeah, I figured that the idea of a free fix would be pretty ludicrous, but I just had to ask. Glad I could provide entertainment for you guys. :)
  • \DigiAx\ wrote:
    I'm told that Mackie had a ribbon connector problem on one of their products and they replaced it for free with a gold connector. I don't suppose Digitech has offered something like that?

    Mackie had a rash of those failures which were affecting power amps, and their mixers. The ribbons were basically snapped into a nickel blade connector. Not something you want with as many current and thermal sensors in those power amps. Mackie (now Loud Tech) handled as case by case basis and mostly units under warranty.

    The ribbon for the GNX are flat ribbon soldered in for the most part. They are machine soldered (dipped in solder) and sometimes over time can fracture, so a lot of times they can be remedied with hand soldering, or in many cases using a controlled hot air unit. IF you use solder, use a low temp. Reason being higher temp irons will bubble the solder and create intermittent connections.

    FWIW those early Rp's didnt require those ribbon or similar connectors like the GNX4. Rp7 is still one of my favorite Digitech multi effect pedals. Otoh, at least Digitech did not end up suffering as heavily on returns as their competitor did with the X3L. That was a premature release with a capital P.
  • Thanks for the feedback. I'll mention this to my expert.
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