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Hardware Equipments for GSM All about Hardware Instruments and equipments like Soldering Stations, Hardware Tools, Oscilloscopes , Frequency Counters ..ext.

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Old 09-08-2010, 16:10   #1 (permalink)
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Frequency Counter

Hi all,
I have a frequency counter "model HC-F2600L multifuction counter" and has range of 10Hz to 100Hz under 250v max and 100Hz to 2.6GHz under 3v and has only led indicator display wher it shows the reading in numbers and has no graph like view like oscilloscope
So is there any use of it for repairing mobile pl give me some help if any professional has used it for fault finding or any tips and tricks to use it.

WAITING FOR PROFESSIONALS TO REPLY
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Old 09-10-2010, 11:42   #2 (permalink)
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Well you can use to test for system clocks. 32kHz for real time clock and more like 26MHz clock for processor (faster in modern phones). Up to 2.6GHz you may be able to test RF section also. For example check before and after antenna switch to see if signal has made it through (RX problems) or check if signal is entering PA (Tx problems). With this you can know if PA is faulty or somewhere before PA.

Really it's not a needed tool as you can diagnose most of these problems really by looking at the phone in your hand.

If ringtones are slow or clock is at the wrong time then 32kHz crystal

If processor fails to start, flash it. You can get error messages to say is it RAM, or you can suspect processor clock (vary rare fault...)

No RX - you can test this with network search and see if list of networks is recieved. If so then RX is ok. Else change antenna switch.

No TX - again use network test in phone menu. If list of networks then you have TX fault. So change PA.

These are the most common faults, if you change the IC and fault persists then maybe your frequency tool will be helpful. In 5 years of GSM service though, I never needed a tool like this.

Br
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Old 09-17-2010, 12:30   #3 (permalink)
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Quote:
Originally Posted by Dave.W View Post
Well you can use to test for system clocks. 32kHz for real time clock and more like 26MHz clock for processor (faster in modern phones). Up to 2.6GHz you may be able to test RF section also. For example check before and after antenna switch to see if signal has made it through (RX problems) or check if signal is entering PA (Tx problems). With this you can know if PA is faulty or somewhere before PA.

Really it's not a needed tool as you can diagnose most of these problems really by looking at the phone in your hand.

If ringtones are slow or clock is at the wrong time then 32kHz crystal

If processor fails to start, flash it. You can get error messages to say is it RAM, or you can suspect processor clock (vary rare fault...)

No RX - you can test this with network search and see if list of networks is recieved. If so then RX is ok. Else change antenna switch.

No TX - again use network test in phone menu. If list of networks then you have TX fault. So change PA.

These are the most common faults, if you change the IC and fault persists then maybe your frequency tool will be helpful. In 5 years of GSM service though, I never needed a tool like this.

Br
thanks for that info but its very difficult for all models to check that bcouse u cannot put sim bat display keypad and check pcb for those frequencies do u know any tricks
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