GIANT ELECTRONICS LTD.
Title: Alignment Procedure
Model: T5025/T5525
Version:
00
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
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A. PCB LEVEL (Test Condition: under CH8)
N O
ITEM
ALIGNMENT METHOD
REMARK
1.
LCD display
(Should enter test
mode)
1. Press and hold the ‘+’ key and ‘Menu’ key together.
2. Turn on the radio power until a good key chirp is heard,
and the backlight is on for about 500 ms . finally, the
LCD should be display ‘
1
CH
’.
3. Press ‘DOWN’ key , then all LCD segments should be
anticlockwise displayed.
4. Finally, all the LCD segments should be shown for
about 500ms as follows:
18
88.
.
2.
Standby current
1. Set A-METER, and RX mode.
2. Check the standby current <45mA DC.
3.
Talk on current
1. Set A-METER, and TX mode @50ohm load.
2. Set channel to 14.
3. Check the talk on current <500mA DC.
4.
VCO
1. Set RX or TX mode
2. Check TP103 to provide 0.7 ~ 2.4VDC.
3. Adjust L113 to provide 2.0
±
0.1
VDC at TP103 if VCO
level are more than 2.4VDC on CH14.
5.
TX Power
(For 5525)
1. Set TX mode channel 7 and check the transmitted
power < 0.04W (ERP) FRS
2. Set TX mode channel 8 and check the transmitted
power < 0.02W (ERP) FRS
(For 5025)
1. Set TX mode channel 7 and check the transmit power <
0.21W (ERP) FRS
2. Set TX mode channel 8 and check the transmit power <
0.12W (ERP) FRS
Test voltage
is 4.5V DC.
6.
CTCSS Tone
Frequency
1.Set CH1/CODE1.
2.Set Tx mode.
3.Check TP140 to be within 66.8Hz to 67.2Hz.
7.
TX Frequency
Adjust C159 to provide 462.5620MHz
±
50Hz.
8.
CTCSS Tone Dev.
1. Set CH1/CODE1
?
AF input level to off , check DEV to
be 350Hz~ 600Hz.
2. Set CH14/CODE38
?
AF input level to off, check DEV
to be 350Hz~ 600Hz.
FILTER SET:
1.50HZ~3KHZ
2.750
µ
s D e-emp
ON
3. PK+
4. FM DEV.
AVG ON
9.
TX Modulation
& distortion
1.Set AF level at 25mv;1KHz, Adjust VR101 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%.
5. Audio Frequency Response.
a) Input a 2.0mV 1KHz audio frequency to TP116
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 .
Fliter set :
1.HPF 50Hz
2.LPF 15KHz
3. PK +
All input at
TP116