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Re: Goldscan 5 damaged:sadwalk:
Posted by: draco
Date: September 04, 2014 01:08PM
Below the headphone cable is a TLC 2262.

I measured voltages and are:

pin 1 = - 0.31
pin 2 = - 0.10
pin 3 = - 0.10
pin 4 = - 4.91
pin 5 = - 0.36
pin 6 = - 0.37
pin 7 = - 4.78
pin 8 = 2.38

Pin 8 is not negative.



Used: Tesoro Euro Sabre, Minelab Excalibur, Goldscan 5.




Re: Goldscan 5 damaged:sadwalk:
Posted by: Reg
Date: September 04, 2014 01:27PM
Hi Draco,

Some GS 5's have the LT1112 but you have a basic substitute dual IC. I suspect this chip, the TLC2262 is bad. You can use a TLC2262, a TL062, and any other decent dual opamp. Hopefully, that will cure your problem. Let me know if you do change it what happens.

Reg

Re: Goldscan 5 damaged:sadwalk:
Posted by: Reg
Date: September 04, 2014 01:35PM
Hi Draco,

I am curious as to where you are located. Hopefully, you will have access to other dual opamps (two amplifiers in the chip). I am betting that changing the TLC2262 will cure the problem. If it does correct the problem, then we saved time and money.

The GS 5 underwent an evolution. I think originally, the LT1114 and the next opamp were TL064 and TL062. Then the operational amplifiers were changed to the LT series for stability. Ideally, the LT series work best because you don't need some of the small 0V balancing pots installed. In fact, on one of my older Goldscan 4's, I installed LT's and eliminated some troublesome pots all together.

Reg

Re: Goldscan 5 damaged:sadwalk:
Posted by: draco
Date: September 04, 2014 02:06PM
Thanks Reg, tomorrow I will try to buy the TL 062 or TL 064.

I'll report



Used: Tesoro Euro Sabre, Minelab Excalibur, Goldscan 5.

Re: Goldscan 5 damaged:sadwalk:
Posted by: Reg
Date: September 04, 2014 02:25PM
Hi Draco,

The one IC I am relatively sure is bad is the TLC2262. So, that is the one to try to replace with either another TLC2262, a TL062, maybe a TL052, or even any other dual opamp. You don't need the TL064. Leave the LT1114 in place.

Reg

Re: Goldscan 5 damaged:sadwalk:
Posted by: draco
Date: September 04, 2014 03:56PM
:thumbup: OK

Thank you



Used: Tesoro Euro Sabre, Minelab Excalibur, Goldscan 5.

Re: Goldscan 5 damaged:sadwalk:
Posted by: draco
Date: September 05, 2014 03:41AM
Hi Reg.
I changed the TLC 2262 by TL 062 and the problem continues.

Thank you.



Used: Tesoro Euro Sabre, Minelab Excalibur, Goldscan 5.

Re: Goldscan 5 damaged:sadwalk:
Posted by: Poseidon
Date: October 17, 2014 05:12PM
Hello Draco,

I can help you, I am French (in the north of France), I am hardware engineer and I have study the Goldscan 5c and Goldscan 5b, Aquastar II etc..., I have the schematic of each detectors (my schematics)

Alexandre



Edited 2 time(s). Last edit at 10/17/2014 05:24PM by Poseidon.




Re: Goldscan 5 damaged:sadwalk:
Posted by: sajad p
Date: June 28, 2017 10:59PM
hi help me please send me pcb & schematic goldscan5. tank you

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