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Re: NEED Schematic Diagram of MINELAB EXCALIBUR 1000 circuit
Posted by: bklein
Date: July 03, 2019 09:20AM
Verify you have something higher than 10.5V at the board where the battery comes in. Best to just use a variable DC supply for diagnosing - adjust 10V to 14V and listen for differences.
Use your scope to review the tx and rx signals from the coil. I don’t recall what they should look like but maybe here is something drastically wrong you see to verify a bad coil.
Does the rx signal look at all responsive to waving big metal near it?
Get a can of freeze spray and a heat gun and try both on the boards and coil while the unit is running.
You may need to buy a replacement coil just to be sure.
Manipulate/flex the boards while they are running. Sometimes surface mount parts crack and open circuit.
Look at pot wipers with your scope while you turn them to verify the signal there nicely varies between what is on the other two pot leads.
Look at all solder joints with magnification. Touch up questionable ones using flux (use the correct stuff, not what is used for plumbing!) to help the solder flow.
Be very careful and use a good hot and small soldering iron. If you can’t solder well skip this as you may make things way worse.
Did your video catch the moment of failure or is it still intermittent?
Does it sound different when you switch from pinpoint to disc.?
Make sure your test area isn’t all metal as that would just overload the detector.

Barry


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NEED Schematic Diagram of MINELAB EXCALIBUR 1000 circuit

sullivan20021176February 17, 2019 02:10AM

Re: NEED Schematic Diagram of MINELAB EXCALIBUR 1000 circuit

bklein93July 03, 2019 09:20AM

Re: NEED Schematic Diagram of MINELAB EXCALIBUR 1000 circuit

sullivan200256July 04, 2019 07:37AM

Re: NEED Schematic Diagram of MINELAB EXCALIBUR 1000 circuit

bklein51July 04, 2019 10:26AM

Re: NEED Schematic Diagram of MINELAB EXCALIBUR 1000 circuit

sullivan200259July 04, 2019 04:05AM

Re: NEED Schematic Diagram of MINELAB EXCALIBUR 1000 circuit

GeorgeinSC195February 22, 2019 09:53PM

Re: NEED Schematic Diagram of MINELAB EXCALIBUR 1000 circuit

sullivan2002207February 23, 2019 03:05AM

Re: NEED Schematic Diagram of MINELAB EXCALIBUR 1000 circuit

bklein100June 09, 2019 09:50AM

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

sullivan2002114June 24, 2019 09:48AM

Re: NEED Schematic Diagram of MINELAB EXCALIBUR 1000 circuit

chuck, ky83June 24, 2019 10:29AM

Re: NEED Schematic Diagram of MINELAB EXCALIBUR 1000 circuit

sullivan200264June 27, 2019 08:25AM

Re: NEED Schematic Diagram of MINELAB EXCALIBUR 1000 circuit

OldBeechnut227February 23, 2019 07:31AM

Re: NEED Schematic Diagram of MINELAB EXCALIBUR 1000 circuit

stoneshirt123May 08, 2019 10:24AM

Re: NEED Schematic Diagram of MINELAB EXCALIBUR 1000 circuit

RC119May 21, 2019 05:29AM

Re: NEED Schematic Diagram of MINELAB EXCALIBUR 1000 circuit

chuck, ky116May 21, 2019 07:52PM

Re: NEED Schematic Diagram of MINELAB EXCALIBUR 1000 circuit

Ron from Michigan152May 09, 2019 07:42PM

Re: NEED Schematic Diagram of MINELAB EXCALIBUR 1000 circuit

bklein123May 27, 2019 09:20AM

Re: NEED Schematic Diagram of MINELAB EXCALIBUR 1000 circuit

sullivan2002109June 04, 2019 06:58AM

Re: NEED Schematic Diagram of MINELAB EXCALIBUR 1000 circuit

GeorgeinSC183February 23, 2019 11:25AM



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