Motorola EVX S24, Service Manual, Page: 16 / 74

5.2
Alignment Preparation and Precautions
A 50-Ohm RF Dummy Load and in-line wattmeter must be connected to the main antenna jack in all
procedures that call for transmission, except where specified otherwise. Correct alignment is not
possible with an antenna.
Because of the BTL (Bridged Trans Less) Amplifier circuit used in the EVX-S24 , do not connect earth
side of the speaker leads to chassis “ground”.
After completing one step, read the following step to determine whether the same test equipment will
be required. If not, remove the test equipment (except dummy load and wattmeter, if connected) before
proceeding.
Correct alignment requires that the ambient temperature be the same as that of the transceiver and
test equipment, and that this temperature be held constant between 68 and 86 °F (20 ~ 30 °C). When
the transceiver is brought into the shop from hot or cold air, it should be allowed time to come to room
temperature before alignment.
Whenever possible, alignments should be made with oscillator shields and circuit boards firmly affixed
in place. Also, the test equipment must be thoroughly warmed up before beginning.
NOTICE: Signal levels in dB referred to in the alignment pro- cedure are based on 0 dBµ EMF
= 1 µV.
5.3
Test Setup
Setup the test equipment as shown below for transceiver alignment, then apply 3.7 V DC power to the
transceiver.
5.4
The Alignment Tool Outline
5.4.1
Installing the Alignment Tool
Procedure:
1 Install the CE157 (PC Programming Software) to your PC and execute the CE157.
2 Click the “Alignment” in the “Radio” menu tab of CE157 to open the “Alignment” window.
MN006437A01-AB
Chapter 5: Alignment
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