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Treasure Hunting & Metal Detecting Forum Message Boards - Detector Hunter Whites Minelab Tesoro XP > Tech Talk > Modifications, Do It Yourself & Repairs (Moderators: Eugene52, xavier, GoldDigger1950) >

Garrett groundhog has no sound but needle works fine

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andy1965 Topic starter

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	Garrett groundhog has no sound but needle works fine « on: May 14, 2015, 04:01:58 pm »

Hi I bought a old Garretts groundhog VLF/TF however there is no sound from the speaker or headphones. Would anybody be able to advise me in how to fix. Also a wiring diagram would be great. Thank you in Advance regards Andy

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	Re: Garrett groundhog has no sound but needle works fine « Reply #1 on: May 14, 2015, 06:00:39 pm »

What Ground Hog are you talking about? Three detectors had the Ground Hog coil. A photo would be good? My bet is it's the output transistor. They GO FOOOOOF if the head phones short out.

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	Re: Garrett groundhog has no sound but needle works fine « Reply #2 on: May 14, 2015, 10:53:26 pm »

Well one things for sure the problem is on the audio output, could even be a broken wire, just open it up and have a look the problem may just a very simple one to fix.

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So many questions so little time

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	Re: Garrett groundhog has no sound but needle works fine « Reply #3 on: May 16, 2015, 06:33:01 am »

Agreed. Audio output circuitry defective,probably a transistor or some broken connection. That's where I,d start looking. Send pics.

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	Re: Garrett groundhog has no sound but needle works fine « Reply #4 on: May 16, 2015, 06:56:19 am »

I've had to replace the audio output transistor of two Garrett detectors. The ADS and the S3 Detectors.

Check the MPS-U45 output to audio.

Transistor (CEN-U45 or NTE272) - MPSU45 - Marco Pinball ...

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#MPSU45. Transistor 2 amp NPN Darlington.

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	Re: Garrett groundhog has no sound but needle works fine « Reply #5 on: May 21, 2015, 05:29:03 am »

I see what looks to be a transformer type symbol for the tx coil, can someone explain. I've seen this symbol on some older schematics instead ofthe regular inducter symbol.

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	Re: Garrett groundhog has no sound but needle works fine « Reply #6 on: May 21, 2015, 05:57:52 am »

I see what looks like a Impedance Matching Transformer on the RX coil.

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	Re: Garrett groundhog has no sound but needle works fine « Reply #7 on: May 21, 2015, 06:08:59 am »

Yes on the Rx coil sorry. An impededence matching transformer, of course. It matches the impedance of the coil to the input impedance of the Rx circuit. Don't think I'll be trying to build one of these schematics.

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	Re: Garrett groundhog has no sound but needle works fine « Reply #8 on: June 01, 2015, 12:38:16 pm »

	Quote:	Posted by homefire
I've had to replace the audio output transistor of two Garrett detectors. The ADS and the S3 Detectors. Check the MPS-U45 output to audio. Transistor (CEN-U45 or NTE272) - MPSU45 - Marco Pinball ... You are not allowed to view links. Please Register or Login www.marcospecialties.com/pinball-parts/MPSU45 #MPSU45. Transistor 2 amp NPN Darlington.

Hi,
I am in the process checking over the circuit of a non working Garrett coin hunter and would like to check the transistor on mine. Mine is marked NSDU45, I'm assuming that it is for the audio. Please, using a digital meter, is there any way to test it, thanks for any help

Regards David

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	Re: Garrett groundhog has no sound but needle works fine « Reply #9 on: June 01, 2015, 01:52:58 pm »

The same one I was talking about . Just Replace it. It's a Darlington and they toaste most easy. Looking for the Original there most dear in price. I used a CEN-U45. Cost two for a dollar!

Someone was looking for $45.00 for the Original. LOL

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http://www.digikey.com/product-detail/en/CEN-U45/CEN-U45-ND/4806928?WT.srch=1&mkwid=sPM0hiPSp&pcrid=62954249835&pkw=_cat:digikey.com&pmt=b&pdv=c

Look around and you can have them for way less.

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« Last Edit: June 01, 2015, 02:00:20 pm by homefire »	Logged

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