Garrett international S-2

It's going to be hard to find schematics for any Garrett machine because they guard them so zealously. However, I have a lot of experience at repairing them without the schematics and what you have happening has two major causes. All Garrett detectors use a split power supply. Check all battery connections for corrosion and/or broken connections. You also want to check for corrosion and open wires on the boards and control panel.

The second major cause is the coil being open. Check for low resistance on both the TX and RX coils. Then check the wiring between the coil connector and the main board. Most failures on metal detectors are mechanical (wires, switches, etc.) unless they have been soaked in salt water or some other tragedy befalls them. Infant mortality on components normally happens in the first few hours of use so if the machine worked before, it might not be component failure.

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