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Comment About Huntron Tracker

By on April 8, 2008

Here’s some of the tips by Robin Cheng in using Huntron Tracker as your troubleshooting tool.

Hi Jestine ,
I agree with you THAT POWER ON TEST IS BEST WAY TO JUDGE IF IC IS GOOD OR BAD because it is full operation test at its actual working environment.

In troubleshooting however, powering on can make things more complicated. If we can find the fault without applying power , wouldn’t it be simpler? Here is my two cents worth! (My experience is mainly from troubleshooting digital logic circuits ).

Huntrons can compare any IC in-circuit with the power off . Do be aware of factors affecting the comparison result though.

Firstly ,when you probe a point or node in a circuit , the current will find the lowest impedance path between the two points you are probing . This is good because you can immediately know where the current is going. If both boards show the same signature , you know there is no problem ! (The current is travelling along the same path between the two points.) Its that simple ! If there is a difference , you will immediately be alerted to double check for differences eg are the IC exactly the same ? (Different manufacturers will give different signatures!) Are any components connected to that node faulty ? you begin to systematically look for the cause of the difference in signature and eliminate what is good until you find the culprit …The bad component !…troubleshooting is all about observation skill anyway.
Huntrons give you a way to see the problem!

Secondly , and the most important , ASA (Analog Signature Analysis ) which is what huntrons display is not a functional test of the IC as such ,its an input /output check of the impedance at the IC junction or interface with its outside world . If there is really a functional failure deep in the ICs circuitry ,then ASA won’t find it . Its only checking whatever is connected to its interface circuitry .

huntron tracker 2700

To cut a long story short , when you can see the fault without applying power to a board , it makes troubleshooting very easy . there are no signals running around to complicate things.

Huntron ASA should be the first step we take in the fault finding process.

There is a learning curve to climb ,before you can be “accurate” at troubleshooting using ASA eg knowing which ranges to select is one thing which has to be learnt for each board. Its an art based on experience not so much a science , so its very hard to teach !
(Huntron provides good guides to make it easier for new comers).

Lastly why does ASA work?
Because failures are usually low impedance paths to ground ,visible at the input/ output of ICs . Most ICs fail at the interface with the outside world , seldom deep inside , because of stress .Its a bit like humans really ! we also get mental problems when we interface with the outside world right ?

Robin Cheng

http://www.vanguard-co.com.my/

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4 Comments

  1. Rohmell Brills

    September 14, 2012 at 5:10 pm

    i just purchased a non-working Huntron tracker on Ebay, looking forward to fixing it and using it!

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    • Jestine Yong

      September 14, 2012 at 9:19 pm

      Hi Rohmell,

      Hope it can be fixed with your expertise.

      Jestine

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  2. Rohmell Brills

    September 17, 2012 at 2:33 pm

    Hello Mr. Yong,
    The Tracker has arrived.
    The Ebay description said that the unit did not power up, use for parts or repair, however when I took it out of hte box, it works perfectly! i'm happy that it works fine, but also a little disappointed because I wanted to do some troubleshooting and repair on the unit.
    Thanks for providing a great site for electronics repair!

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    • Jestine Yong

      September 17, 2012 at 8:24 pm

      Hi Rohmell,

      The tracker 2000 has a common fault of bad electronics relay that controls the A and B switching.

      Jestine

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