How can this metal detector be repaired by tracing the circuit voltage

Adequate detector metal detector

It was clarified in this video, by measuring the voltage of the device, how if we track the voltage coming out of the electronic parts of the device, we can fix it if it breaks down.

Where we started to measure the voltage coming out of the transmitter circuit of the sufficient detector, and it is known that the transmission circuit of the sufficient detector is the same that we used with the radio and with AISI 555 and we used it with a hybrid detector as well as in several forms to obtain a metal detector circuit because the depth of this simple transmission circuit reaches 3 Meters It is important to know that the depth of the device always depends on the size of the file used and the number of its rolls.

The device consists of two parts, the transmitter part, the receiver part and the signal amplifier. Here comes the signal amplifier's polymorphism

Figure of the transmitter circuit and the voltages coming out of it in pictures