CD error Vanquish 540

[Melano87]

Have you tried probing the pins of the coil while it is connected in order to determine if there is any signal?
If you do not have an oscilloscope you can have some sort of idea using a multimeter in AC voltage, or if it is a single frequency machine, with Hz measurement.

I'm traveling but I'll look into it again this weekend or next week.

[Melano87]

Unfortunately with a CD error the Tx circuit is disabled. So you can't do a decent circuit test. If lucky maybe you will find a bad solder joint or burned component.

See page 17

Yes, it's very possible. Thanks

[Melano87]

Maybe the photo is not enough resolution, maybe this is nothing... but with the available photo it seems to me that something is wrong with this chip. Some pins have turned a darker color, as if burned or overheated.
Pins 12, 13, 14... 23,24 and 25. Also... C308 is missing the left solder side...

Yes, Ivonic, Nedjet, there are traces of oxidation (or burned/overheated) I think due to intensive use at the beach by the previous owners.
I'm traveling for work and I don't have the detector in front of me, I'll take a closer look this weekend or next week, especially for C308 because I don't seem to have seen any problem but maybe I saw it wrong.
In the original image, there are several points where I saw overheating, oxidation or other.

[nejdet]

Thoroughly washing with alcohol and a toothbrush, re-soldering the suspicious areas and drying...that's what I would do first.

[Melano87]

Thoroughly washing with alcohol and a toothbrush, re-soldering the suspicious areas and drying...that's what I would do first.

I cleaned with deoxit d5, brushed etc.
Not re-welded for the moment.

I wondered before re-welding whether to give it a cleaning bath with my 3L ultrasonic bath (and 95-99% alcohol)

[nejdet]

The ringing with a multimeter is not to be ignored! That's all I can tell from the picture. Good luck!

[Skippy]

Quote: "Yes,.. there are traces of oxidation (or burned/overheated) I think due to intensive use at the beach"
This is bad news, especially considering the tiny components, BGA IC packages. That 'big' aluminium electrolytic cap with the distinctive corrosion pattern tell me it has been exposed to moisture. The same corrosion is seen on aluminium bicycle frames, the corrosion creeps under the clear varnish/lacquer, leaving the white spider-web lines. That cap is probably OK, it's just the outer can that has the corrosion. It is the tiny parts that are the trouble.

[Melano87]

Back and the news isn't good, lol.

After a cleaning bath in an ultrasonic bath,

I remembered I had a good old Paralux binocular microscope at my parents' house.
I didn't take any measurements.

Something happened, yes, it got hot.
I noted.
Photo A, severe corrosion,burning ; the capacitor seems to be working properly.
Photo B, severe corrosion,burning ; the leg is no longer soldered; I could move it with a pin.
Photo C, severe corrosion,burning ; a component went up in smoke...

[JoyJo]

By the way, this bunch of 6 transistors (probably) resembles an alternative to the full N bridge - ccpi, which offered Moodz. And the chip next to it is probably a driver.

[JoyJo]

For comparison, equinox uses as a cascade a pair of th mosfet in the co8 housing and one electrolytic capacitor in series with the tx coil. The MOSFet driver, of course, is also in the form of a separate chip. The power supply of the th cascade is made on the dc-dc converter, the output voltage of which is regulated by software, since there is a control chain directly in the microcontroller stm32f745.

[JoyJo]

Thanks Skippy.

As mentioned above, I tested and checked my two coils, no issues.
I unsoldered the board connector to check, and nothing happened either.
Regarding the measurements, I admit I'm not sure where to test; I tested to the best of my ability.

I had some doubts about the capacitor because it looks strange, see the photo.
But it looks fine.

While you have the metal detector disassembled, can you see a close-up photo of this site so that you can read the marking of the elements?

[Melano87]

While you have the metal detector disassembled, can you see a close-up photo of this site so that you can read the marking of the elements?

I'll try to get you the picture as soon as possible.


I will resell the detector in spare parts.