Mobile Phone Repair Technology

The frequency and amplitude of VI ' bration are monitored

ASK FSK psk:amplitude shift keying: amplitude keying, amplitude shift keying ...

Msk:minimum shift keying: Minimum (frequency shift) shift keying

GMSK: Gaussian filter MSK.

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Basic methods of electronic maintenance:

1 Basic knowledge

2 understand the basic distribution of the circuit

3 understand diode/transistor/capacitance/inductance/resistance and other components of the measurement: this is the most important,

4 replacement

The most important is: the 3rd, basically is the measurement, found that the component is broken, the replacement on the line!!

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Voltage not stable! = Transition

Don't put the voltage instability is called jump change good? General maintenance Time said that the jump is the difference between high and low potential! Usually 0V jump to 3V or 3V jump 0v! The only thing called jumping! Memory power supply 2.3v--2.6v, this is called voltage instability do not call jump change!!
Not the jumping edge, the voltage is unstable.
Then we'll just change the MOS.
First put the memory tube for no, then follow the G-Pole circuit to check the control circuit

Mobile Phone Repair Technology