Giant T5025 Alignment Procedure

GIANT ELECTRONICS LTD.
Title: Alignment Procedure
Model: T5025/T5525
A. PCB LEVEL (Test Condition: under CH8)
NO ITEM
LCD display
1.
(Should enter test
mode)
2. Standby current
3. Talk on current
4. VCO
5. TX Power
CTCSS Tone
6.
Frequency
7. TX Frequency
8. CTCSS Tone Dev.
TX Modulation
9.
& distortion
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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
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tuneup.doc
ALIGNMENT METHOD
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
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
1. Set A-METER, and RX mode.
2. Check the standby current <45mA DC.
1. Set A-METER, and TX mode @50ohm load.
2. Set channel to 14.
3. Check the talk on current <500mA DC.
1. Set RX or TX mode
2. Check TP103 to provide 0.7 ~ 2.4VDC.
3. Adjust L113 to provide 2.0
level are more than 2.4VDC on CH14.
(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
1.Set CH1/CODE1.
2.Set Tx mode.
3.Check TP140 to be within 66.8Hz to 67.2Hz.
Adjust C159 to provide 462.5620MHz
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.
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 .
Version:
CH
'.
88.
.
± 0.1 VDC at TP103 if VCO
50Hz.
±
00
REMARK
Test voltage
is 4.5V DC.
FILTER SET:
1.50HZ~3KHZ
2.750 µ s D e-emp
ON
3. PK+
4. FM DEV.
AVG ON
Fliter set :
1.HPF 50Hz
2.LPF 15KHz
3. PK +
All input at
TP116
1/5