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Offline Homefire
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« Reply #180 on: January 26, 2010, 06:10:08 pm »
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You all give up to easy!

This can be fixed.

Worst Come to Worst he can send it to me and I will Correct it.

Dang! Wise

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Offline Cornelius
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« Reply #181 on: January 26, 2010, 06:13:01 pm »
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Thanks for your offer Homefire . This may help Ali a bit on his way .   Cornelius

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« Reply #182 on: January 26, 2010, 07:15:56 pm »
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Ok, My Turn.

In the Aritical there is a circuit board loading siquence.

Pull all chips you can.

Read the loading and primary test sugested and start with the first one.

Step 1 is omitted because your not using that section.

Step 2

LOAD ic2 and C11

switch on.

measure output of C2 it should be -5v.

switch off.
If your chips are soldered to board, just pull the ground pin if you can.

Heat it up and bend out of place with tweezers.

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Offline alimanTopic starter
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« Reply #183 on: January 26, 2010, 07:26:01 pm »
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Thanks for your help Homefire, gonna call it quits for tonight. We'll talk again tomorrow
Cheers
Aliman

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« Reply #184 on: January 26, 2010, 07:30:34 pm »
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Bed time here too! Only 6:30 but have to face the elements in the AM.

You Will Get there. Wise

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« Reply #185 on: January 27, 2010, 01:43:02 am »
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One more idea, which doesn't need soldering: do any of the parts heat up noticeably? In that detector only Tr2 is allowed to warm up, and just a little bit. Practically no other parts should be warmer than room temperature. If one of them is hot, that is consuming the power!

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Offline alimanTopic starter
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« Reply #186 on: January 27, 2010, 10:39:52 am »
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Still looking for that short that I created. One obeservation I made, I have two small 12V batteries, when I connect them to the Power cord, there is 24volts at the end of the power cord. But when I plug the power cord into the Metal detector, the voltage drops drops down to 18.4 volts. What the F$#*.
 When I use two 9v batteries ,total of 18.4 v. I plug the power cord into the detector it drops down to 17.1v
Gotta keep looking.
Aliman

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« Reply #187 on: January 27, 2010, 11:27:11 am »
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Probably your 12V batteries are low. Without load, even the exhausted batteries are able to put out nominal or close to nominal voltages.   The output only drops down when you connect the load.
Keep going with the 9V batteries. I recommend power on, and looking for any part abnormally heating up. If nothing heats up in 2-3 minutes then you can stop, and we've got to find out another way.

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« Reply #188 on: January 27, 2010, 12:31:21 pm »
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Peti80, thanks for the heat check tip.  I did what you suggested and after about 1 min., TR2(TIP31C) got really HOT.
I think we found the problem.
Aliman

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« Reply #189 on: January 27, 2010, 01:07:31 pm »
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You have a short in your coil

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So many questions so little time
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