9 CALIBRATION PROCEDURES
9.1 Introduction
The following procedures MUST be performed after replacement or repair of the PCB. Failure to do so may result in incorrect
operation of the telephone.
The following adjustments MUST be made to the complete unit using the appropriate Repair Jig. The applied voltage should
be a constant 3.8V with a current limit of 2.5A.
There are four distinct calibration procedures to adjust RF performance. These procedures are: Carrier Power calibration
(Section 9.2.)
RSSI (Section 9.3.) also
To ensure that the phone is within set SAR margins after a Peak Power Calibration has been performed, a power meter that is
accurate to 0.2 dB MUST be used.The output power of the phone can be influenced by the RF/Logic shield covers, therefore all
power calibration procedures MUST be performed with the shield frames and covers fitted.
IF ANY OF THE RF OR LOGIC SHIELDS ARE REMOVED FROM THE PCB AT ANY TIME, THEY MUST BE REPLACED BY
NEW ITEMS. ONCE REMOVED, THE SHIELDS MUST NOT BE REUSED.
9.2 Carrier Power Calibration
9.2.1 General Information
Tx Calibration can be performed manually Manual Calibration is used to adjust or verify each calibration channel in turn.
To minimise the variation of Tx power with frequency due to component tolerance, each GSM band is split into sub-bands,
which are calibrated separately. The calibration bands and channels used are as follows:
Calibration
BandSegment
Channel
09
167
EGSM 900
2124
3975
0512
1636
GSM 18002761
3885
0512
1612
GSM 19002710
3810
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ACEC
PANASONIC
