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FDP Forum / Miscellaneous and Non-Fender Topics / I guess the old Vox DA 5 is mort

professor
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North Gnarlyington

Sep 3rd, 2017 12:57 PM   Edit   Profile   Print Topic   Search Topic

No power, changed batteries, with adaptor, without, zilch. I've had it for years, and was fun as a throw in the car when traveling thing, so I guess I must get something similar

There's the raved about Boss Katana at about $100, and there's the newer Vox with built in drum machine @$169...

Vox Mini5

(This message was last edited by professor at 03:18 PM, Sep 3rd, 2017)

ejm

usa

Sep 4th, 2017 08:52 AM   Edit   Profile   Print Topic   Search Topic

And the various Blackstar stereo amps......


Peegoo
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Activity does not

always equal achievement
Sep 4th, 2017 10:05 AM   Edit   Profile   Print Topic   Search Topic

It's worth doing a little troubleshooting.

Crack it open and take a good look at the DC power jack. These take abuse through simple use (a tug on the cable every so often) and it can crack the solder connections on the PCB. Sometimes all you have to do is re-flow the solder pads for the jack.

I'm suggesting the jack first, because it's a switching jack: plug an AC power adapter into it and it takes power from the wall. Pull the plug from the jack, and a little internal switch in the jack brings the battery into the circuit. Ab bad/broken solder connection to the PCB can prevent electricons from AC adapter AND/or the battery from getting into the circuit and bringing it to life. Reflow the solder (add a dab of fresh solder as you do) and I'll bet that fixes the problem. Even if you "can't solder," watch a few YT how-to vids and you'll have the skills.


If the power jack is A-ok, bypass the power switch with clip-on leads from a battery and see if that gets power in (mind the polarity).

If it's not the switch, look on the board for a toasted voltage regulator chip or resistor, or a popped cap. They are dead simple to replace.

These things have very few parts and a repair is a buck or two (the cost of the blown component) and your labor time.

professor
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North Gnarlyington

Sep 5th, 2017 07:26 AM   Edit   Profile   Print Topic   Search Topic

Thanks Peegoo, I'll give it a look when I'm back later this week. Perhaps an indicator was that there was a period when it was still working, but only with batteries, not the adaptor, which was ok because that was the only time I used it.
What you describe would be within the limits of my soldering skillz. I have a somewhat bigger Weller iron, which can be clumsy trying to maneuver. I really should get one of those smaller, pen size ones.

jay1vinton

Hawaii, USA

Perfect is the enemy of good enough
Sep 21st, 2017 05:25 PM   Edit   Profile   Print Topic   Search Topic

Mine crapped out too after about 3 yrs. I did some internet research and there is a Transistor or resistor,or similar that is attached to the power section, it gets hot and is immersed in a heat sink kind of grease. It's usually the culprit from what I have read on it. I opened mine, and sure enough, it was burned. I have not done a thing to it as of yet.

(This message was last edited by jay1vinton at 07:26 PM, Sep 21st, 2017)

professor
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North Gnarlyington

Sep 22nd, 2017 01:33 PM   Edit   Profile   Print Topic   Search Topic

Took off the back cover, looked inside, couldn't find anything obvious, but even if there was it is such a cramped space it would be hard to maneuver my clunky Weller soldering iron in there.

FDP Forum / Miscellaneous and Non-Fender Topics / I guess the old Vox DA 5 is mort




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