CALIBRATION PROCEDURES
PMCD030901C8 Section 9 Issue 1
Service Manual – 51 – Revision 0
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 3.7 V DC at 2 A.
There are two distinct calibration procedures to adjust RF performance. These procedures are:
Carrier Power calibration (Section 9.2.)
RSSI (Section 9.3.)
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.
Battery calibration includes checks on voltage, temperature and charging. These procedures are described in Section 9.4.
Adjustment data selected during calibration is stored in Flash ROM.
9.2. Carrier Power Calibration
9.2.1. General Information
Tx Calibration can be performed manually or automatically. Automatic Calibration is the preferred method but requires a
Gigatronics 8541C power meter. 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:
NOTE:
See Section 6 for a list of the equipment and setup procedures required to perform the following adjustment
and calibration procedures.
Band Segment
Calibration
Channel
Channel Range
EGSM 900
B-ch 975 975 - 1010
L-ch 1 1011 - (0) - 36
M-ch 50 37 -89
H-ch 100 90 - 124
GSM 1800
B-ch 512 512 - 550
L-ch 600 551 - 651
M-ch 700 652 - 752
H-ch 800 753 - 853
T-ch 870 854 - 885
GSM 1900
B-ch 512 512 - 540
L-ch 580 541 - 620
M-ch 662 621 - 699
H-ch 740 700 - 779
T-ch 795 780 - 810
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