minelab sovereign gt power issue

[raelsbro]

My sovereign gt was working great, then
Turn on power it would sound if turning on and off in quick sequence,
Now when you turn it on just a quick threshold then nothing.
This is with either battery pack ( charge or AA ).
I have dismantled the unit and check for the obvious.
Nothing burnt, boards good,connections and pots meter out good.

What I need is a schematic, or test points, or ideas.

[Waikiki_Sweep]

At least you can try if transmitting part (TX) working or not. Working detector TX have to create interference for other detectors or lower frequency (not FM) radios.

[raelsbro]

TX is not creating any interference with other detectors.
I have a couple that don't get along with Sovereigns or Excals.
Traced power to some points on the boards, but need a little more info.
Thanks for the help.

[Mechanic]

HI Raelsbro,

Can you post a couple of photos of the board?
Does the lcd come on?
Check that the Ic's are getting power to their power pins(check their datasheets to find the power pins)
Do you have a scope? Monitor the power rails at startup. I recently repaired a detector that would momentary turn on then off again. I found that it had a faulty 5v watchdog, replaced that and away it went. max809

Cheers Mick

[raelsbro]

Thanks Mick,

Was able to find all the data sheets for the Ic's.
I checked voltages across Ic + and -pins (I'll call this A value)and then ground to v+ pin (I'll call this B value) on all.
Different voltage readings on a 7 Ic's between A and B method.
See photo of Ic layout and voltage readings.
Obviously I have more trace work to do.

Thanks for the replies,
Ken

[kt315]

attachments are not open for me.

[raelsbro]

They were working last night, I will repost them tonight.

[raelsbro]

photos

Posted photos to my Photobucket
http://s1373.photobucket.com/user/ra...mbed/slideshow
Just having issues posting photos and keeping detail on forum.