Broken Laser B1 High Power

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	Broken Laser B1 High Power « on: April 08, 2016, 08:54:33 am »

Hi, I'm a 'newbie' to this community, but have over 20 years of detecting under my belt.
I have a Problem with my Laser B1 High Power & hoped someone might be able to help me resolve the issue. The Laser machines are very similar to Tesoros, as you may know. Basically, water got into the machine one day & it started to play up, so I dried the inside where the board was as best I could, managed to pull off the cables to each one of the battery pods, resolved that, switched on, and it worked fine for about 2 hours and then it made a 3 second sort of electrical whirring noise that got quieter towards the end, -then, SILENCE! Got home, decided to change the connectors to the two 4x AA pods, and managed to disconnect the 2 wires that feed power to the mainboard, ie: the + & - wires. It seemed that one had come off the board, & the other from the on/off switch. They are in close proximity to each other, but it seemed likely that the + wire went to the switch, both logically and by the way it curved upwards towards the on/off switch & the - went onto the board. There was a green wire attached to the same area where there are 3 solder points apparently joined to each other. I could see where a cable had been, and so I soldered the Black Negative cable here, and the (again black) positive cable here. Checked with a multimeter, and power was received to the switch, and then onto the board when swiched on, but there was no sound at all from the machine, either through headphones, or the speaker. This was with the coil attached. The Laser does an aural battery check when switched on, but I got nothing. I tried a different coil, known to be working, but no change. I cannot find a good enough picture anywhere on the web to check wires are the right way around. A schematic diagram could help, so I could take it to someone local to fix, or any advice to help me fix it myself would be much appreciated.

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	Re: Broken Laser B1 High Power « Reply #1 on: April 08, 2016, 09:38:52 am »

Welcome to the Forum. Just for Chits and Grins have you contacted Tesoro ? My bet is they can provide required info if not the schematic. I can't seem to find the Schematic in my usual Hants.

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	Re: Broken Laser B1 High Power « Reply #2 on: April 08, 2016, 01:41:48 pm »

Your guess is as good as anyone, mate. Personally, I photograph a detector before I fiddle with wires so lesson learned. If you did hook it up backwards, there is a better than even chance you fried some component. The good news is that these are simple machines and any decent radio technician can fix it. For the sake of general help, here is what I can tell you for certain.

On battery packs, black is always negative and the negative on most PC boards has the largest area of copper and most often has a - sign on the copper somewhere. The red wire is positive and there may or may not be a + sign on the copper where it hooks up. Perhaps if you posted a picture of both sides someone could give you some advice. There is a trick to adding a picture here.

To add an attachment, use the Preview button below. Then add an attachment. All attachments must be under 500k in size so you may have to use the free application that you can get from the downloads area called Photo_Re_Sizer.zip.

Posted on: April 08, 2016, 09:20:22 pm

	Quote:	Posted by homefire
Welcome to the Forum. Just for Chits and Grins have you contacted Tesoro ? My bet is they can provide required info if not the schematic. I can't seem to find the Schematic in my usual Hants.

He said it was similar to a Tesoro. Not likely to get help from them on this one.

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	Re: Broken Laser B1 High Power « Reply #3 on: April 08, 2016, 03:14:12 pm »

Tesoro :

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http://regton.com/laser-metal-detectors.html

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	Re: Broken Laser B1 High Power « Reply #4 on: April 08, 2016, 03:50:30 pm »

I happen to know they are not the same company, Homefire, despite being the UK "arm" of Tesoro as claimed. It's a sales outlet. However, LASER might help him via Metal Detector Specialists.

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	Re: Broken Laser B1 High Power « Reply #5 on: April 08, 2016, 04:15:00 pm »

Emmmm . Laser metal detectors are the result of a desire to build the perfect metal detector for coping with UK & European conditions. To achieve their goal Laser turned to Tesoro, an American metal detector manufacturer recognised throughout the world for a range of superior quality metal detectors, some of which were already UK best sellers.

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	Re: Broken Laser B1 High Power « Reply #6 on: April 08, 2016, 04:18:51 pm »

Tell you what, Homefire. Call Tesoro and they will give you the cold shoulder. Remember, we have had this issue before with other users looking for help with Laser. They can claim all they want but reality sometimes brings out the facts. Tesoro, being the kind of company they are, will probably not call them out but the also refer you to the UK company for support and deny affiliation. Call them tomorrow. Don't take my word for it.

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	Re: Broken Laser B1 High Power « Reply #7 on: April 08, 2016, 04:23:07 pm »

Then Tesoro should buff them. They look like Clones. Case and all.

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https://www.crawfordsmd.com/metal-detectors/laser

They come out and say Tesoro build them.

Laser Rapier II

Built by Tesoro and based around their legendary Silver Sabre series of metal detectors, the Rapier Plus metal detector has been carefully designed to Laser's specifications to meet the demands of UK metal detecting conditions. Ultra light 'micromax' design with simple 'turn on and go' performance sum up the Laser Rapier plus perfectly. Due to customer demand Laser recently added the 9 x 8 web coil as standard for extra depth and a sharper target response.

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	Re: Broken Laser B1 High Power « Reply #8 on: April 08, 2016, 04:31:58 pm »

No, they did do the original design for coins of different sizes. Remember that huge thread discussing that? Support for the European models was never meant to be from the Tesoro factory. It was a contract job, not a company expansion. There's no bad feelings there but the support issues for the different frequencies is too complicated to do both for either. I used my Compadre in Australia and should have been using a European model because the coins there resemble those more closely. But I coped.

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	Re: Broken Laser B1 High Power « Reply #9 on: April 30, 2016, 11:08:40 am »

Ok guys, thanks for your help Homefire & GolldDigger1950, you were both right in your own way!
Basically, Tesoro were the first port of enquiry as it had 'Tesoro' printed on the circuit board. but they wouldn't help with a schematic.
So on to Laser,who referred me to Regton.
Anyway, after trying a couple of friends who fix pc's & t.v's & not having any success, I called Regton and spoke to the guy there & explained the problem. He was really helpful & said that the pcb cleaning spray is not good for them. He said there are a lot of really sensitive components on there with high resistances and it will need to be washed off, and if there is the slightest bit of muddy water on there it will most probably affect it too.
I asked about the wiring of the feeds from the batteries, but he didn't know where the +ve & -ve wires went, & suggested I send it to him if all fails.
I looked at the board again & assessed that the cables were most probably in the right places as the Positive must surely be the wire going to the on/off switch, and the large track on the pcb with a green wire attached to one of three common connection places must surely be the Negative???
I was reasonably confident as the bends in the wires backed this up.
So I washed the bare pcb thoroughly under the tap, using some pressure, then rinsed it with distilled water to get rid of all the impurities of the tap water.
I viewed the board under a strong magnifying glass & was surprised to see very small pieces of mud, and particles of mud among most of the tiny components, under the legs of IC's and Capacitors, and mostly everywhere! So after 30 mins of further cleaning with a tiny brush and toothpick, it was spotless! I gave it a quick blow dry & put it in the airing cupboard overnight and viewed it in the morning under the magnifying glass for any remaining dust and it was spotless.
I looked for any dry joints again & noticed 2 possibles, greyish in colour, so I re-soldered them as a precaution, attached the batteries, plugged it into the head, and........Bang! - It worked!!! Sorted!!!
So, in conclusion, thanks to Homefire for the initial welcome & advice, (but you lost the bet). *Note I had tried Tesoro & Laser before I posted on here.
Also thanks go out to GoldDigger1950 - You were spot on with the politics of Tesoro & Laser. Shame really.
Anyway, hope you find chunks of Gold over there. We only find Celtic, Roman, the very rare Saxon, & a few medieval coins & artifacts.
Unfortunately our soil, or the chemicals put into it, seems to eat up the bronze stuff in a lot of areas in the UK.
I see it as 'rescuing' them from destruction.
Later.......

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