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Offline AK48Topic starter
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« on: February 02, 2019, 12:41:33 am »
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good morning , a friend of mine bring me a power

pack of GPX 4500 from minelab , i just change the

eight cells but some components burn and i wanna

know if someone can give me schematic for this

power pack , thank you .

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« Reply #1 on: February 02, 2019, 10:53:52 am »
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   Mine Lab are  somewhat Tight Lipped on anything they make or made.  How about a Photo of what your talking about.  Is it the Amplifier that toasted ? 

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« Reply #2 on: February 02, 2019, 05:25:17 pm »
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These are pretty straightforward to repair but there are 2 versions.
The most common parts that fail (all to do with audio failure and/or no go) are circled
{alt}
{alt}



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« Reply #3 on: February 03, 2019, 12:27:54 am »
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good morning and thank you guys ,  i love you , i'm gonna ttake pics of mine and i'll show you soon !!!

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Offline AK48Topic starter
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« Reply #4 on: February 03, 2019, 05:56:17 am »
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hello , i've put the pics , i wanna know what is

JP6 on PIC 1 , and what's the value of R31 on PIC 2

, and it seems to me that the guy don't replace the

original resistor on PIC 3 , thank you .

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« Reply #5 on: February 03, 2019, 11:42:09 am »
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  Clueless on MineLab stuff.   Boy I would do a work around on that crappy set up.   Power the Detector Direct and use independent Audio Amp.

Wonder why in ell they went that route ?

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« Reply #6 on: February 03, 2019, 02:49:56 pm »
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Quote:Posted by Homefire
  Clueless on MineLab stuff.   Boy I would do a work around on that crappy set up.   Power the Detector Direct and use independent Audio Amp.

Wonder why in ell they went that route ?


Its actually a pretty basic setup that reduces the need for an external amp.

The circuit is basically 2 sections.

1: A LiPo balanced charger with charge monitoring, over voltage and current protection. Maybe a little over designed but as a rule it generally works well.

2: A basic amp circuit with a sense circuit that detects when a speaker is connected as against headphones. The sense circuit is completely dependent on how the headphone/speaker plug is wired.

The power supplied to the detector goes direct from the battery via a power mosfet. The mosfet is only switched on when there are no faults detected - I gather this is to protect the detector from battery faults or protect the battery if the detector/power cable shorts.

Posted on: February 03, 2019, 02:44:16 pm
Quote:Posted by AK48
hello , i've put the pics , i wanna know what is

JP6 on PIC 1 , and what's the value of R31 on PIC 2

, and it seems to me that the guy don't replace the

original resistor on PIC 3 , thank you .


Looks like someone has made a bit of a mess with the soldering.

R31 is 150 ohms

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Offline AK48Topic starter
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« Reply #7 on: February 03, 2019, 05:18:18 pm »
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good night , i say thank you to all , i'm gonna do the change , good job , thank you again !

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