Lowrance LML-500 metal detector schematic needed!

[Cañedo]

Hi all,
Grandpa has a very old Lowrance LML-500 metal detector that needs some repairs but having no schematic seems an impossible task to me.

So wondering if anyone here have access to that old schematic.

Don't know why that detector is so special to him but at least he is hesitant to take my AT pro because he says doesn't have knobs and that there is no comparison on the sound, he has mentioned that at least one time when we went out for comping a few months ago and I took my AtPro for hunting.




Regards.
Jose

 

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[Cañedo]

Also, as far as I know, this detector was designed and built in Tulsa Oklahoma.