xp adventis 2

[dremi]

I need the schematic for my xp adventis2

[Skippy]

Is your machine broken? It may be fixable without circuit diagrams.

[dremi]

Hi!
The cable was broken,and burned the panel.the problem the no name pic and the xp1,xp2 cristal.I dont know what is the pic type and the xp cristal type!!
Sorry I dont write correct maybe because i dont write english very good

[Skippy]

The xtals are unlikely to be damaged. The IC's could be damaged, but you only need one to work, there are two because the detector can transmit on two frequencies. If it is impossible to repair, you could disconnect the transmitter circuitry and just use normal headphones.
This link may help:http://www.geotech1.com/forums/showthread.php?t=18728

[dremi]

Thank you very much.I will try tomorrow.I didn't know what the function of the xp1 and the xp2 xtail.it does not matter if it does not work with wireless headset.i will reply for you.

[kt315]

what the function of the xp1 and the xp2 xtail

thinking it si some kinda a receiver like you see (have you opened a mobile phone?) in the phone.

at photo ADX250, not ADVENTIS-II.

[Skippy]

I'm sure it is the wireless headphone transmitter circuit. Could be 433MHz FM, in which case the 'crystals' are actually SAW resonators, and the IC is a FM modulator. But it might work at radio-control model frequencies, 27MHz, like a lot of cordless PC mice.

[dremi]

Hi!THANK YOU GUYS!I soldered the burnt part and it looks like the machine works.But i did not try with search coil.Next week i wilL try,i hope it will works with the coil.

[Skippy]

That's good, hope it stays working for you.
For technical interest, I can confirm the headphone transmitter works on 433MHz, FM. I looked on XP's website and found a mention of it.
It would be interesting to know what the IC's used for the transmitter are. Dremi - are you able to read off any markings from either of the two integrated circuits in the radio-transmitter?

[dremi]

Yes it's goodBut unfortunately the top of the ic is empty,no markit was the problem.I wanted to change the defekt ic but i didn't know.maybe it's secret....thank you

[Skippy]

I am curious about the transmitter, so investigated what it may be, and came up with a couple of likely candidates: the Melexis TH72016:
http://uk.farnell.com/jsp/displayPro...sp?sku=1714574
and the Micrel MICRF112:
http://uk.farnell.com/micrel-semicon...p10/dp/1494165
Both are similar, and use a regular quartz crystal of approximately 13MHz and PLL synthesis to generate the 433MHz transmit signal. The crystals in the detector look to be custom frequencies, as they are labelled 'XP XT1' and 'XP XT2'. Notice they are both intended for 3V operation, so wiring faults that stick 12V on them are likely to cause the heat-and-flames type result.

[Skippy]

An update with some technical info:
Over on another forum, a guy posted an internal picture of an XP GoldMaxx, with the optional 433MHz ISM radio transmitter module installed.
I've attached the pic, and a zoom-in. It's a single-frequency transmitter, the later GoldMaxxPower ( and GMAXX2 ) had as standard a dual transmitter circuit, giving two selectable operating frequencies.
You can just make out the transmitter IC is the Melexis 72016 part, as I speculated in my earlier post.

I know the operating freqs, when I find my notes I will update the thread.