Sharp GX15, Service Manual

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GX15
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CONFIDENTIAL
8. Click “OK”.
Figure 50
9. The initial screen returns.
Note:
The RF calibration tool allows the calibration but not the check when the terminal fails to catch signals from the GSM tester (unable to access a net-
work with “no service” displayed). There is a possibility that CMU200 did not start properly. Turn off CMU200 and restart.
4.5.5 RF calibration & RF performance check
Pressing the “Cal_Check” button initiates RF calibration and RF performance check in succession.
Since some operations are skipped, this is handier than executing calibration (“Cal” button) and performance check (“Check” button) separately.
1. Set the stabilised power supply voltage to 4 V and turn on the handset (phone).
2. Start “RF calibration & check” on SPST and press “Cal_Check”.
3. Lower the stabilised power supply voltage to 3.7 V and press “OK”.
4. Make sure the voltage is set properly and press “OK”.
5. After the calibration and check, increase the stabilised power supply voltage to 4.0 V and press “OK”.
6. Make sure the voltage is set properly and press “OK”.
7. To save the results, press “Save As...” and enter a file name. To exit, press “OK”.
8. Press “OK”.
9. The initial screen returns.
(Steps 1 - 4 and 5 - 9 are respectively equivalent to RF calibration by the “Cal” button and RF performance check by the “Check” button.)