11 replies to this topic

[sigma_fr]

Hello,
I have several in 500mW Tx lawmate that work very well for over a year.

During a test within 20 minutes in the Tx has a lot of heated because now it only works 10 seconds (it's been a fair bit even for teamblacksh*t member).

In short if you know you can save him? it's serious doctor?

Or must buy a new one?

Thank you

Julien

[Mr.RC-Cam]

I think a good test to start out with is to compare operating currents. For example, what is the measured current draw on it? What is the current on a good one?

[sigma_fr]

I think a good test to start out with is to compare operating currents. For example, what is the measured current draw on it? What is the current on a good one?

Ok,

I check : Power supplied is 5 V

Power line disconnected => short cut => Ground / Power line

Is it normal ?

ju

[Mr.RC-Cam]

Power line disconnected => short cut => Ground / Power line

You'll have to explain in detail what that means.

[sigma_fr]

You'll have to explain in detail what that means.

Ouups sorry, Here is a picture.
So mesure between groung and +. And I found no résistance. Sound not good ?

Attached Thumbnails

• 

[Mr.RC-Cam]

if you are measuring 0.0 ohms (no resistance) then that is definitely a problem.

[Terry]

or do you mean no resistance reading, no change when you test the pins?


Terry

[sigma_fr]

or do you mean no resistance reading, no change when you test the pins?


Terry

I read 0 ohm.

We are working on with an electronicien friend and it seems that the RF composant failed (over heat)

Top left red circle on the picture

Julien

Attached Thumbnails

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Edited by sigma_fr, 18 July 2011 - 01:30 AM.

[Terry]

I can not tell from your picture if there is damage to that part but if you think it is bad remove it and retest the resistance. If the resistance is good then you just have to find a replacement part.

I dont use that TX so can you tell me the resistance of a good TX?


Terry

[sigma_fr]

Ok so I finely find my problem ............... is was not the TX but the RX battery ...........

So we mesure some temperature on the TX and some part are very hot (see attach file).

So all works fine now

Julien

Attached Files

•  Thermal test Tx lawmate 1.2 Ghz.pdf   174.93KB   225 downloads

Edited by sigma_fr, 19 July 2011 - 05:18 AM.

[Terry]

So what was all that about 0 ohms and a componant fail ???


Terry

[sigma_fr]

So what was all that about 0 ohms and a componant fail ???


Terry

0 ohms => well I don't know, I will compare with a new TX.

Composant fail ........ finely no componant fail. I thought that because my installation stop working and the TX was very hot ... but the reson is one of my 3S cell died (RX pack)

julien