Motorola I580 service manual Preparing for Field Level Testing, Preparing Equipment for Testing

PREPARING FOR FIELD LEVEL TESTING: Preparing Equipment for Testing

CHAPTER 7

PREPARING FOR FIELD LEVEL TESTING

Field level testing requires external equipment and support. To conduct field level troubleshooting and testing of an i580 unit, you must become familiar with the screen readouts of the recommended test equipment.

Display screens provide information that is useful for troubleshooting purposes. Refer to Chapter 3 for information on the displays, errors, alert tones, and messages associated with this unit.

7.1Preparing Equipment for Testing

To ensure accurate testing of the unit, it is important that the test equipment function properly.

7.1.1Calibrating Equipment

Test equipment should be internally calibrated before being used for testing. Note that the internal calibration does not substitute for a factory calibration. For more information, refer to R-2660 Digital Communications System Analyzer Operator’s Manual.

7.1.2Checking the RF Cable

Check the cable connection and quality to ensure that the test results are true. Cable length is critical to consistent Rx sensitivity and Tx power measurements. Use a high-quality, shielded, 50-ohm, coaxial cable that is approximately 1.5 feet in length. Place the unit to be tested at least 6 inches from the R-2660 Communications System Analyzer. The cable loss should be less than 2 dB.

7.1.3Strong-Signal Environments

When using the R-2660 Communications System Analyzer to test a unit in a strong-signal environment (–75 dBm or stronger), change the bandmap of the unit.

For Registration/Call testing: Power up the unit. Immediately after hearing the beep, press Start on the R-2660. The unit will lock onto the first strong signal.

7.1.4Protecting Static-Sensitive Devices

This unit contains static-sensitive devices that must be protected when opening the unit, or storing and transporting any printed circuit board. Consider the following information to create a proper ground:

•Ground the working surface of your service bench. If possible, use the Motorola Static Protection Assembly (P/N 0180386A82) to ground your service bench. This assembly contains a wrist strap, two ground cords, a table mat, and a floor mat.

•Wear a conductive wrist strap in series with a 100 kΩ resistor to ground.

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