LXT110
LABORATORY TESTING PROCEDURES
Page 1
UNIT TEST - (UNIT ASSEMBLED)
TEST PREPARATION
1) Install 3 “AAA” alkaline batteries (observe polarity markings).
Right middle terminal is the system plus polarity
Left bottom terminal is the system minus polarity.
2) Press the power button.
SYSTEM TEST
1) Radiated Transmit and Receive performance may be observed.
2) Audio out & Audio in are available at the Headset jack.
LABORATORY TEST - (UNIT UN-ASSEMBLED)
TEST PREPARATION
1) Disassemble unit (6 screws – 2 behind batteries). Remove the PCB from the
cabinet.
2) Remove the antenna and install a 50 ohm coax cable in its place.
3) Either clip alligator leads or solder test leads to the power supply connections. The
positive terminal is the lower left PCB mounting hole. The negative terminal is the
lower right PCB mounting hole top of the 20.95MHz X-tal. (battery side view)
4) Connect 4.5VDC power source to the terminals, observing correct polarity.
5) Connect an 12-ohm load through the Headset jack (3.5mm mono-phone plug).
6) Connect a audio generator with 10uF coupling capacitor through the Headset jack
( 2.5mm mono-phone plug).
7) Select desired channel 1- 22 using CH up/down keypad switch. The rubber keypad
may be removed from the front cabinet and used directly on the PCB.
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