Findmall.com
 
 






Minelab Excalibur & Sovereign Forum


Welcome! Log In Register
Re: NEED Schematic Diagram of MINELAB EXCALIBUR 1000 circuit
Posted by: sullivan2002
Date: June 24, 2019 09:48AM
the problem is that I can't find the problem, it takes me every so often to check the motherboard but it all seems fine. The impedance between TXA and TXB and RXA and RXB seems ok, there are no traces or marks of water in the tracks, the tracks all look okay, I can hear the threshold sound very well and I can adjust the intensity with the relative pot (knob) but when I set over the coil a piece of aluminum, it does not detect it,
Honestly, I'm in a closed alley and I don't know how to proceed. Maybe there was dampness or damaged slopes, but this is not the case.



I don't think is a coil problem,
I don't think is a water or humidity, metal detector inside I found it very dry
I don't think now is xtal cause if was xtal maybe I say maybe I could not hear the threshold sound
battery is out of the question cause I use only power supply with 13/14volt
I don't think are traces, nobody could damage them, they are in good shape and all are inside the Excalibur casing
I don't think are pots, I changed one, I replaced one with another taken from the sensivity, I don't remember but I also I tried to shorten the external terminals as if it were at its maximum value

I need good advice from someone who is really expert, a push to get to the solution

PS: I have a tester and a little oscilloscope, I need to know where to put the tips and what to test and what to check again.

I discovered that touching the boad near the volume pot, It changes the volume of the threshold but is like when I touch an input of an home amplifier but I don't hear the tipical sound of detection.


THANKS



Edited 3 time(s). Last edit at 06/24/2019 09:54AM by sullivan2002.



SubjectAuthorViewsPosted

NEED Schematic Diagram of MINELAB EXCALIBUR 1000 circuit

sullivan20021039February 17, 2019 02:10AM

Re: NEED Schematic Diagram of MINELAB EXCALIBUR 1000 circuit

bklein30July 03, 2019 09:20AM

Re: NEED Schematic Diagram of MINELAB EXCALIBUR 1000 circuit

sullivan200223July 04, 2019 07:37AM

Re: NEED Schematic Diagram of MINELAB EXCALIBUR 1000 circuit

bklein19July 04, 2019 10:26AM

Re: NEED Schematic Diagram of MINELAB EXCALIBUR 1000 circuit

sullivan200223July 04, 2019 04:05AM

Re: NEED Schematic Diagram of MINELAB EXCALIBUR 1000 circuit

GeorgeinSC143February 22, 2019 09:53PM

Re: NEED Schematic Diagram of MINELAB EXCALIBUR 1000 circuit

sullivan2002157February 23, 2019 03:05AM

Re: NEED Schematic Diagram of MINELAB EXCALIBUR 1000 circuit

bklein60June 09, 2019 09:50AM

Re: NEED Schematic Diagram of MINELAB EXCALIBUR 1000 circuit Image Attachments

sullivan200254June 24, 2019 09:48AM

Re: NEED Schematic Diagram of MINELAB EXCALIBUR 1000 circuit

chuck, ky42June 24, 2019 10:29AM

Re: NEED Schematic Diagram of MINELAB EXCALIBUR 1000 circuit

sullivan200232June 27, 2019 08:25AM

Re: NEED Schematic Diagram of MINELAB EXCALIBUR 1000 circuit

OldBeechnut163February 23, 2019 07:31AM

Re: NEED Schematic Diagram of MINELAB EXCALIBUR 1000 circuit

stoneshirt78May 08, 2019 10:24AM

Re: NEED Schematic Diagram of MINELAB EXCALIBUR 1000 circuit

RC75May 21, 2019 05:29AM

Re: NEED Schematic Diagram of MINELAB EXCALIBUR 1000 circuit

chuck, ky74May 21, 2019 07:52PM

Re: NEED Schematic Diagram of MINELAB EXCALIBUR 1000 circuit

Ron from Michigan90May 09, 2019 07:42PM

Re: NEED Schematic Diagram of MINELAB EXCALIBUR 1000 circuit

bklein75May 27, 2019 09:20AM

Re: NEED Schematic Diagram of MINELAB EXCALIBUR 1000 circuit

sullivan200258June 04, 2019 06:58AM

Re: NEED Schematic Diagram of MINELAB EXCALIBUR 1000 circuit

GeorgeinSC130February 23, 2019 11:25AM



Sorry, only registered users may post in this forum.

Click here to login