Giant Electronics T4600 Alignment Procedure

GIANT ELECTRONICS LTD.
Title: Alignment Procedure
Model: T4600/T4400

A. PCB LEVEL (Test Condition: under CH1)

NO ITEM
1. LCD display
(Should enter test
mode)
2. Standby current
3. Talk on current
4. VCO
5. TX Power
6. TX Frequency
7. TX Modulation
& distortion
THE CONTENT OF THIS DOCUMENT IS GIANT ELCT.LTD. INTELLECTUAL PROPERTY AND IS THE PROPERTY OF
GIANT, IT IS TO BE TREATED AS STRICTLY AND IS NOT BE DISCLOSED, REPRODUCED, OR USED EXCEPT AS
AUTHORIZED IN WRITING BY GIANT ELECTRONIC LTD. IN CONNECTION WITH THE MANUFACTURE, MAINTENANCE
AND USE OF THE GIANT EQUIPMENT WHICH IT PERTAINS. COPYRIGHT @GIANT ELECT. LTD, ALL RIGHTS
RESERVED.
tuneup.doc
ALIGNMENT METHOD
1. Turn on the radio power until a good key chirp is heard,
finally, the LCD should be display '1'.
2. Press 'DOWN' key , then all LCD segments should be
Anti clock wise displayed.
3. Finally, all the LCD segments should be shown for
about 500ms as follows: 218
1. Set A-METER, and RX mode.
2. Check the standby current <45mA DC.
1. Set A-METER, and TX mode @50ohm load.
2. Check the talk on current <400mA DC.
1. Set test mode
2. Check TP3 to provide0.8 ~ 2.3VDC.
3. Adjust L11 to provide 2.0
level are more than 2.4VDC on TX modeCH20.
1. Set TX mode Ch15, Check transmit power to provide
0.06W GMRS power
ERP
2. Set TX mode Ch14, Check transmit power to provide
0.07W FRS power
ERP
Adjust C53 to provide 409.75MHz
1.Set AF level 25mv, 1KHz, Adjust VR1 to provide
Max TX deviation 2.25KHz to 2.35KHz.
2.Check input Mic level in 0.5~10 mV to provide normal
Deviation 1.5KHz.
3.Check the demodulation distortion <= 5%.
1. Audio Frequency Response.
a) Input a 2.0mV 1KHz audio frequency to TP33 and
press 'PTT' switch.
b) Check the response compare to 1KHz tone.
i) 500Hz : -5.0 dB to –11.0 dB.
ii) 2.5KHz : +3.0 dB to +9.0 dB .
Page:
VDC at TP103 if VCO
± 0.1
50Hz.
±
1 of 4
REMARK
Test Voltage
is 4.5VDC.
Filter set :
1.HPF 50Hz
2.LPF 15KHz
3. PK +
All input at
TP33