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Old 03-21-2008, 04:02 AM #33
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Default Re: AMC7135 blues. (Gazoo, need your assistance)

If you take a minute and trace the circuit you will see that the pads I indicated are electrically equivalent to the CLEARLY DIFFERENT board that you have in the second pic. My pic is correct. I have the same type boards and they work fine for me. *Do you have another board you can try?

Can you take some clear pics of your setup?


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Old 03-21-2008, 04:21 AM #34
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Default Re: AMC7135 blues. (Gazoo, need your assistance)

here you go.
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Old 03-21-2008, 04:23 AM #35
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Default Re: AMC7135 blues. (Gazoo, need your assistance)

let me explain the pic. I connected the ground going to the batteries to the outer ring on the back part of the AMC. Later, when it did not work, I tried wiring it to the exact same area that you pointed. No effect as well. The positive is soldered on the centre ring at the back of the AMC.
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Old 03-21-2008, 04:29 AM #36
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Default Re: AMC7135 blues. (Gazoo, need your assistance)

By the way....the pic is of a brand new board that I used to try Paul's wiring setup
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Old 03-21-2008, 04:34 AM #37
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Default Re: AMC7135 blues. (Gazoo, need your assistance)

Ok so far. Can you post a pic that shows the rest of the wiring?
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Old 03-21-2008, 04:45 AM #38
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Default Re: AMC7135 blues. (Gazoo, need your assistance)

Here you go mate. I have shown the opposite side of the AMC so that you can see how I have wired it
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Old 03-21-2008, 04:58 AM #39
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Default Re: AMC7135 blues. (Gazoo, need your assistance)

Can you measure the voltage between the batt neg and the right pin on the IC?
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Old 03-21-2008, 05:05 AM #40
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Default Re: AMC7135 blues. (Gazoo, need your assistance)

Yes....about 3.6 Volts
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Old 03-21-2008, 11:52 AM #41
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Default Re: AMC7135 blues. (Gazoo, need your assistance)

That should mean the MELF diode is OK. *You have a strange problem. *Everything is wired correctly.

Check to make sure the bare wire circled in red does not short to the outer ring.

I have had some of these boards come that had not been properly reflowed. Try re-melting the solder on the pin with the green circle as well as the tab on the IC. Let the IC cool between doing each one so it is not destroyed.

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Old 03-21-2008, 12:23 PM #42
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Default Re: AMC7135 blues. (Gazoo, need your assistance)

Quote:
Originally Posted by chimo
That should mean the MELF diode is OK. *You have a strange problem. *Everything is wired correctly.

Check to make sure the bare wire circled in red does not short to the outer ring.

I have had some of these boards come that had not been properly reflowed. *Try re-melting the solder on the pin with the green circle as well as the tab on the IC. Let the IC cool between doing each one so it is not destroyed.


As well as the tab on the IC? What do you mean by that?

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Old 03-21-2008, 02:26 PM #43
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Default Re: AMC7135 blues. (Gazoo, need your assistance)

Quote:
Originally Posted by ron
[quote author=chimo link=1205458041/30#40 date=1206100376]That should mean the MELF diode is OK. *You have a strange problem. *Everything is wired correctly.

Check to make sure the bare wire circled in red does not short to the outer ring.

I have had some of these boards come that had not been properly reflowed. *Try re-melting the solder on the pin with the green circle as well as the tab on the IC. Let the IC cool between doing each one so it is not destroyed.


As well as the tab on the IC? What do you mean by that?

*[/quote]

The tab is the wider piece of metal at the top. *It is electrically connected to the center pin.


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Old 03-21-2008, 02:42 PM #44
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Default Re: AMC7135 blues. (Gazoo, need your assistance)

Tried it man....added a bit of solder on the pins just to make sure there is proper contact.....but still no result.



What am I to do?
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Old 03-21-2008, 03:01 PM #45
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Default Re: AMC7135 blues. (Gazoo, need your assistance)

Quote:
Originally Posted by ron
Tried it man....added a bit of solder on the pins just to make sure there is proper contact.....but still no result. *

* *

*What am I to do?
Have you checked the traces for continuity? *Remove a battery and use the continuity mode on your DMM (or low ohms resistance scale) to verify that the in/out pads are connected to the components they are supposed to be.

If all is good, connect it up again and measure voltages at the key locations. *Put your fingers on components to feel for excess heat. *Take measurements quickly after connecting power. *You could also try shorting the MELF diode. *If all this fails, then you must either have a board short or a faulty component. *The QC on these boards is terrible.



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Old 03-22-2008, 02:46 AM #46
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Default Re: AMC7135 blues. (Gazoo, need your assistance)

Hey Paul,


I tried it but could not find a continuity between the positive side (where you connect the batteries) and the negative side (where the LD connects back to the AMC circuit). So does this mean that the internal circuitry has not been soldered on properly etc?

I think I am going to ask DX to replace my product.






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Old 03-22-2008, 02:55 AM #47
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Default Re: AMC7135 blues. (Gazoo, need your assistance)

Quote:
Originally Posted by ron
Hey Paul,


I tried it but could not find a continuity between the positive side (where you connect the batteries) and the negative side (where the LD connects back to the AMC circuit). So does this mean that the internal circuitry has not been soldered on properly etc?

I think I am going to ask DX to replace my product.
Try soldering the negative of the batteries to the spot I indicated in Reply #26 above.
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Old 03-22-2008, 04:58 AM #48
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Default Re: AMC7135 blues. (Gazoo, need your assistance)

Hi Paul,

Tried it. No effect. Could it be that the IC itself is spoiled? (a bad batch perhaps) Anyway to test?
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