Page 253 - CITS - Electronic Mechanic - TT - 2024

ELECTRONICS MECHANIC - CITS

Now lets take one example of basic hardware troubleshooting methods in one particular mobile phone handsets.
In this simple way you can then manage how to troubleshoot or been able on finding faulty parts or components
within a mobile phone circuitry.
An example here is Nokia 6300, now assuming that this handset having a faulty microphone or mouthpiece.
Do the basic procedures mentioned above, assuming that you are familiar with the Mouthpiece or microphone
circuit, and already know how to check a microphone or mouthpiece component.
you can now do this step below;
1 Find any available schematic diagram and locate the microphone circuit layout on it. Remember where each
parts and components location and do a mapping like this.

2 Use a multi-tester and check the pads for a short circuit, this is not always happen but it is also unpredictable
to a mobile phones short circuit might occurs, you are not checking the outer mounted components but the
internal lines with it. Just set the tester to x1 resistance value, I preferred analog multitester in this lesson for
it is cheaper to purchase rather than the digital. Now connect both test probe to the inner and outer layer of
the mouthpiece terminal pads, then do it again in opposite manner, a short circuit have both readings closer
to zero ohms.

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CITS : E & H - Electronics Mechanic - Lesson 130 - 145