IDX-PRO+VDI

[CDI]

hi freinds
please i need for help
what is the problem here

Try to put finger on audio transistor, if is hot, its look like u have short somewhere...

[lian]

Thank you freind

poor contact of R38 and I change Q3....The sound works but I can't change the frequency of TX I change the capacitor and the number of turns of the coil

[lian]

Hello
The device only works in mode pin-point
In your opinion, what is the problem?
thanks to all

[dgm]

Hi Lian, in my opinion, first you have to check the pcb and all connected components are correct, then the wires that go to the potentiometers are too long, finally, you have to make the coil properly, both the tx and rx are tight with a string and the tx is temporarily blocked on a tablet, and the rx is placed on it and the precise point is found to perform a nulling. You have to measure a voltage as low as possible almost close to zero, but even 2 millivolts is the same, this voltage must be measured with an oscilloscope vpp in ac between the ground of the pcb and the sixth pin of the 5534 ic.

[dgm]

Remember that the voltage you read must be divided by 10, due to the gain of the ic.

[Amermurad]

Hello
The device only works in mode pin-point
In your opinion, what is the problem?
thanks to all

You have a short between ground and neg
ative

[Amermurad]

You should find 0, 4, and 8 volts

[Amermurad]

Maybe you hook the sensitivity switch to negative 4. If you know what I mean by negative 4

[Amermurad]

The sensitivity switch is connected to the virtual ground, not the real ground. I mean, it went out to M358

[teoturk]

Hello, I have some test videos that I shot about idx pro. As an idea

https://www.youtube.com/channel/UCxm...qMuMzxhlE9db7g

[lian]

Hello everyone, can anyone tell me how to measure the frequency of the RX coil?

[Artyom]

Hello everyone, can anyone tell me how to measure the frequency of the RX coil?

You need to make an external oscillator, connect the test circuit and a frequency meter or oscilloscope to it.

[lian]

You need to make an external oscillator, connect the test circuit and a frequency meter or oscilloscope to it.

thank you

[ArchibaldSTM]

For a stable start of this generator, change resistance R3 to 24k

[kt315]

Hello everyone, can anyone tell me how to measure the frequency of the RX coil?

coil generator : tester of coils - Geotech Forums (geotech1.com)