CTX 3030 What is under the hood?

[bklein]

I received the coil I had intended to use for this but testing so far shows it good so I'm hesitant to destroy it. More testing necessary.
Is there a (Russian?) forum where this project was discussed in more detail? Can you post full size photos that show detail?

[bklein]

Confused by CTX RX coil signals

The coil I received had one or more marginal soldering connections at the plug. I cut off the urethane coating to get access to the plug pins and fix them by resoldering. This gave me access to the various pins to look at with my scope. The TX signal looks fixed. The RX signals obviously are variable - but I am confused because there are three wires that seem to be related to these RX signals and they all seem to be identical with my scope... Perhaps I need to hook up a logic analyzer? I don't get it. I would think they would majorly differ. Anyone have any insight. Same thing if I wave a quarter over the coil.

[Carl-NC]

The RX should be an analog signal.

[bklein]

There is a center ground pin, two heavy gauge TX wires, and these 3 signals. I read that there may be an accelerometer and A/D on the coil's pcb.

[Carl-NC]

That's my understanding as well. So likely 2 wires are for comms (SCLK/SDA) and 1 wire is RX. You might have a short somewhere.

[bklein]

I made an assumption on the ground pin and might be wrong. Have to check. The channel 3 signal seemed higher impedance than the other two - weird...

[bklein]

The center pin (blue wire) is the digital signal, not ground. The red and black wires seem to be grounds - buzz to USB ground and battery negative. Still, I don't recognize an RX signal or a second digital clock signal on the remaining wires. Could use some help.

[bklein]

Cr1220 internal battery died a second time after 2 years or so. This time the machine will not stop the “usb connected”messages. It needs to reload firmware to recover but how to get it to do that? Hard reset process functions but doesn’t fix it. It has been sent off to minelab repair but I’m seeing what others have been charged for repairs and choking. Rather than the unit having one processor Im thinking it may have two - one in each module. At this point I don’t know which one is at fault. Once I know maybe it can be repaired at component level (by me)? Jeez I hope its something simple or I’m going to have to search for a second one.

[bklein]

USB connected fault was due to corroded jack contacts. Wow.