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Post subject: G-DEC 3 15 - no sound, tuner doesn't work, panel works fine
Posted: Fri Mar 24, 2017 12:22 pm
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Came with firmware 1.02 - successfully updated to 1.04. I get NO backing output, tuner doesn't respond, no output either through speaker or headphone jack. Basically, it LOOKS like it should be doing something, but it ain't!!

I will be opening it up this weekend. Is there a way to do a FACTORY RESET on this amp? I have seen ways to do it on the previous model, but only thing I can find for the 3 is a restore of the factory presets! I have done the plug and unplug headphone jack thing a hundred times. Also, some questions: when I start a backing track, should the display show that a backing track is playing? Reading the manual, pressing the Quick access button should bring up the backing tracks - I guess that's what I am seeing - but pressing Start/Stop does nothing, no display change.
ANY help would be appreciated. I am so disappointed - I got this for a good price - it was as-is but looks to be in pristine condition except for some dust! I am dieing to try this bugger!

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Last edited by mmatheny on Mon Mar 27, 2017 8:57 am, edited 1 time in total.

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Post subject: Re: G-DEC 3 15 - no sound, tuner doesn't work, panel works f
Posted: Mon Mar 27, 2017 6:13 am
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OK - pulled electronics out this weekend. Transformer/power supply says should be putting out +- 17.88 VDC and 9.13 VDC. 5 wires on plug - 2 blue, red, yellow, red. I would have to assume blue are grounds because I don't have a diagram. Anyway, blue to ANY other wire is only 4.77 VDC. So seems that there is enough power to fire up the panel, but not nearly enough to fire up the amp. The transformer seems to have some part numbers on it, but Google search yielded nothing. Two numbers on transformer: HKSP-090211 and HEC-5009C. Shows Input: AC 120V 60Hz OUTPUT: S1 DC +-17.88V 590mA S2 DC 9.13 V 780 mA. Any idea where I can get a replacement transformer/power supply (I combine this description because it looks like a standard transformer encased in a metal shield but because it shows DC output I have to assume it also has a regulator in it.) Can someone confirm what voltage should be on what color wire and where I might purchase a replacement transformer please? I found a G-DEC 30 schematic that shows the exact same color wires I have (https://www.electronica-pt.com/esquema/ ... tic-27735/), but it looks like the yellow is gnd and the two reds should have 24.4VAC on them! Is this the same power supply that's on the G-DEC 3 15?? Doesn't state what the the two blue wires should have! Why would transformer state VDC on it if it puts out AC?? Also, transformer doesn't put out ANYTHING unless it's plugged in - so seems to be behaving like a switching power supply! Please help!!

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Post subject: Re: G-DEC 3 15 - no sound, tuner doesn't work, panel works f
Posted: Mon Mar 27, 2017 8:55 am
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OK - found THIS on the Knowledge base - HOWEVER - there is NO Speaker or Line Out setting in the Util menu (firmware 1.04)! Is this setting ONLY on the G-DEC 3 30?? (not stated in the knowledge base article!)

Why can't I hear the Band Track from the Fender® G-DEC® 3 speaker or line output signal?

In Utility mode, verify the Speaker setting and Line Out setting are set to All. To enter Utility mode, simply hold the EXIT button on the Fender G-DEC 3 for about 3 seconds.

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Post subject: Re: G-DEC 3 15 - no sound, tuner doesn't work, panel works f
Posted: Mon Mar 27, 2017 11:34 am
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Can anyone verify that the transformer on the G-DEC 3 15 puts out power without it being plugged into the main board? Mine appears to be totally dead, but apparently puts out SOMETHING because the panel works and I was able to upgrade firmware!

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Post subject: Re: G-DEC 3 15 - no sound, tuner doesn't work, panel works f
Posted: Tue Aug 08, 2017 12:55 pm
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OK - I bought a working one, so now I have this one to sell. I have full Fender schematics with it. Power supply is fine. It seems to be something between the pre-amp and the rest of the circuitry. I'm taking offers plus shipping. Someone throw me a reasonable offer, remembering that these are getting harder and harder to find. don't believe me? - search eBay!

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