Motorola A925 Service Manual download pdf (Page 25)

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Motolora Confidential Proprietary

Preliminary

Manual Test

Procedures

Introduction

The phone allows keypad and computer controlled test-

ing of various digital test parameters.

This chapter includes the keypad/computer functions

and recommended equipment setup to use when test-

ing a phone manually.

Call-Processing Tests

Most communications analyzers can simulate a cell site

in order to perform automatic call-processing tests.

Automatic call processing tests can be performed while

the phone is in standby mode.

Refer to the communications analyzer’s manual for de-

tails about performing call-processing tests. The follow-

ing call-processing test sequence is recommended:

1. GSM Mobile Originated Call

2. WCDMA Mobile Originated Call

3. GSM handover

4. DCS handover

5. PCS handover

Non-Signalling Test Measurements

In an event that the phone exhibits RF failures that pre-

vent call processing, the service technician may need to

perform some non-signalling tests. These tests will pro-

vide information regarding which stage of the phone is

failing prior to opening the phone for troubleshooting.

The following tests will be described in this chapter.

• GSM/DCS/PCS TX Power Output

• GSM RSSI

• WCDMA TX Power Output

The digital phasing parameters are stored in a EPROM

on the Transceiver Board. Each transceiver is shipped

from the factory with these parameters already cali-

brated. However, if a board is repaired, these param-

eters should be measured and, if necessary, adjusted

with the GP-Gate System. Checking and adjusting cali-

bration parameters is also useful as a troubleshooting/

diagnostic tool to isolate defective assemblies.

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Motorola A925 Service Manual Page 25