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Re: NEED Schematic Diagram of MINELAB EXCALIBUR 1000 circuit
Posted by: bklein
Date: July 04, 2019 10:26AM
Use your wife’s hair dryer for the heat gun. Another suggestion is to bake the coil at like 130F degrees or so in an oven for a few hours.
To proceed from here I’d need to see videos of the wiper voltages as you turn the pots, closeup photos of the boards, what you are using for a power supply,, stuff like that. You won’t find a schematic. You will have to understand basic signal flow and guess what parts are doing what so you can proceed through it. Like what is the preamp IC and do you have an output that changes depending on the target. Do you have a good supply voltage on the IC’s - 3.3v or 5v on supply pins or did the voltage regulator die...

The coil can die on its own just like the main board can - its electronics (has a preamp ic inside) and had exposure to water. Look for cracks in the coil cable insulation or the coil housing itself. If I were you I’d be trying really hard to get another coil to try. For kicks though, try unsoldering one lead of the rx connection at the board, power the unit and touch it back to where it was. Do you get any sound change by doing this? If you touch either rx input with your finger does it do anything to the sound? If it does it would be a good sign that maybe the coil is the issue, but Im guessing here.

I may be getting a control board that needs repair from a guy in the next few weeks and if so I can document some of the signals I see for you. I don’t want to take my excals apart as they are a total @#$%& to get back together.

If you can find a spray can of electronic component cleaner you can spray the whole board and brush some things lightly with a small brush or cotton swab. It may expose bad soldering areas you can fix.
I don’t know anyone who fixes these at the component level. Yours was intermittent though and that’s good. Usually a cracked component, bad pot, bad soldering, open trace, water in the coil cable...


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NEED Schematic Diagram of MINELAB EXCALIBUR 1000 circuit

sullivan20021179February 17, 2019 02:10AM

Re: NEED Schematic Diagram of MINELAB EXCALIBUR 1000 circuit

bklein96July 03, 2019 09:20AM

Re: NEED Schematic Diagram of MINELAB EXCALIBUR 1000 circuit

sullivan200259July 04, 2019 07:37AM

Re: NEED Schematic Diagram of MINELAB EXCALIBUR 1000 circuit

bklein53July 04, 2019 10:26AM

Re: NEED Schematic Diagram of MINELAB EXCALIBUR 1000 circuit

sullivan200262July 04, 2019 04:05AM

Re: NEED Schematic Diagram of MINELAB EXCALIBUR 1000 circuit

GeorgeinSC198February 22, 2019 09:53PM

Re: NEED Schematic Diagram of MINELAB EXCALIBUR 1000 circuit

sullivan2002210February 23, 2019 03:05AM

Re: NEED Schematic Diagram of MINELAB EXCALIBUR 1000 circuit

bklein103June 09, 2019 09:50AM

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

sullivan2002117June 24, 2019 09:48AM

Re: NEED Schematic Diagram of MINELAB EXCALIBUR 1000 circuit

chuck, ky86June 24, 2019 10:29AM

Re: NEED Schematic Diagram of MINELAB EXCALIBUR 1000 circuit

sullivan200266June 27, 2019 08:25AM

Re: NEED Schematic Diagram of MINELAB EXCALIBUR 1000 circuit

OldBeechnut233February 23, 2019 07:31AM

Re: NEED Schematic Diagram of MINELAB EXCALIBUR 1000 circuit

stoneshirt126May 08, 2019 10:24AM

Re: NEED Schematic Diagram of MINELAB EXCALIBUR 1000 circuit

RC122May 21, 2019 05:29AM

Re: NEED Schematic Diagram of MINELAB EXCALIBUR 1000 circuit

chuck, ky118May 21, 2019 07:52PM

Re: NEED Schematic Diagram of MINELAB EXCALIBUR 1000 circuit

Ron from Michigan157May 09, 2019 07:42PM

Re: NEED Schematic Diagram of MINELAB EXCALIBUR 1000 circuit

bklein126May 27, 2019 09:20AM

Re: NEED Schematic Diagram of MINELAB EXCALIBUR 1000 circuit

sullivan2002112June 04, 2019 06:58AM

Re: NEED Schematic Diagram of MINELAB EXCALIBUR 1000 circuit

GeorgeinSC189February 23, 2019 11:25AM



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