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Go Back   GSM-Forum > GSM & CDMA Phones / Tablets Software & Hardware Area > Nokia > Nokia Hardware & Hardware Repair

Nokia Hardware & Hardware Repair all what you need for Hardware Repairing for Nokia Phones. Before writing any thread here try to check the Frequently Asked Questions Section.

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Old 07-05-2009, 13:29   #1 (permalink)
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Post Do You Know ? (2nd post)


PM (permenent memory) which is a memory area of flash ic it contain all Hardware calibration data and security data of your phone

1 what is the meaning of hardware calibration and how its work ?

any phone has a Analog to Digital cnverter circuit it collect many imformations by the variation of voltage and current in the circuit and this all analog variations are cnvert to a Digital Data and send to the processor

In DCT4 this A/D converters are locate in the UEM
In BB5 this A/D converters are locate in the RETU

**
A/D Name Imformation

BSI (battery size indicater) Type of the battery


Btemp Tempeture of the Battery


ACI Identify the type of accessory which
connected to the phone(handfree)


VB (not all VB lines) voltage level of the battery


Vchar Voltage of the Charger



*** Above all A/D converters are need to Tune (callibrat) for working properly and accurate

***this tuning process need to done separatly for each phone

*** all this tuning data are store in PM DATA AREA

*** these tuning data are diferent from phone to phone even they are in same type

**** RF CALIBATION DATA ALSO INCLUDING IN THIS PM DATA AREA

*****If these Tuning DATA is currupt so many fault can be occur

NOT CHARGING , NO NETWORK ,OVER CHARGING , ACCESSORY NOT SUPPORTED,

YOU CAN TRY TO SLOVE BY CHANGING PM FOR THIS FAULT
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