Calibration Procedures; Introduction; Carrier Power Calibration - Panasonic EB-GD67 Service Manual

8 CALIBRATION PROCEDURES

8.1. Introduction

NOTE: See Section
calibration procedures.
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 PCB using the specified PCB 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:
1. Carrier Power calibration (Section 8.2.)
2. RSSI (Section 8.3.)
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 Shield cans, therefore all power calibration procedures MUST be
performed with the shield can wall sections and lids in place.
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 8.4.
Adjustment data selected during calibration is stored in Flash ROM.

8.2. Carrier Power Calibration

8.2.1 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:
Band Start
MMCD020801C8
Service Manual
6.3. for a list of the equipment and setup procedures required to perform the following adjustment and
Band Stop
975 1009
1010 20
21 55
56 90
91 124
512 586
587 661
662 736
737 811
812 885
Calibration
Sub-band
Channel
992 PL_GSM_Bch
3 PL_GSM_Lch
38 PL_GSM_Mch
73 PL_GSM_Hch
108 PL_GSM_Tch
544 PL_GSM_Bch
624 PL_DCS_Lch
698 PL_DCS_Mch
774 PL_DCS_Hch
885 PL_DCS_Tch
Section 8
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CALIBRATION PROCEDURES
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