GIANT ELECTRONICS LTD.
Title: Alignment Procedure
Model: SX700
Date: Feb 26, 2005
A. PCB LEVEL (Test Condition: under CH15,
Supply=5.2Vdc
)
NO 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 ‘-’ key , then all LCD segments should be
anticlockwise displayed.
4. Finally, all the LCD segments should be shown for
about 500ms as follows: 2
18
88.
.
2. Standby
current
1.
Set A-METER, and RX mode.
2. Check the standby current <80mA DC.
3.
Talk on current
(Power supply 5.2V
DC)
1. Set A-METER, and TX mode @50ohm load.
2. Set channel to 15, Check the talk on current <1500mA.
3. Set channel to 14, Check the talk on current <800mA.
4.
VCO
1. Set RX or TX mode
2. Check
TP503
to provide 0.7~2.3VDC .
3. Adjust L509 to provide 2.2
±
0.1
VDC at
TP503
if VCO
level are more than 2.4VDC on CH14.
4. Set WX mode, check TP504 to provide 0.7~2.4VDC
5. TX
Power
(Power supply 5.2V
DC)
1. Set TX mode CH15, Check the transmit Hi-power to
provide
0.63W ERP
.
2. Set CH15 Low power mode, Adjust VR801 to transmit
Low-power to provide
400±30mW
3. Set TX mode CH14, Check the transmit power to
provide
550±200mW .
***
6.
TX Frequency
1. Set TX mode
2. Adjust VC501 to provide 462.5500MHz
±
50Hz.
7. CTCSS
Tone
Frequency
1. Set CH15/CODE1 and Tx mode.
2. Check CTCSS tone frequency to be within 66.8Hz to
67.2Hz.
8.
CDCSS Frequency
1. Set TX mode
2. Set CH15/CODE99
3. Adjust VR501 to provide 503 Octal Code
4. Set CH15/CODE39, check Octal Code to be 023
FILTER SET:
1.Input Level:
0.9KHz
9.
CTCSS Tone Dev.
1. Set CH15/CODE1 AF input level to off, check DEV to
be 300Hz~ 650Hz.
2. Set CH14/CODE38 AF input level to off, check DEV
to be 300Hz~ 650Hz.
FILTER SET:
1.50HZ~300HZ
2.750
µ
s De-emp
ON
3. PK+
4. FM DEV. AVG
ON
10. TX
Modulation
& distortion
1.Set AF level at 50mv;1KHz,Adjust VR101 to provide
Max TX deviation 2.25KHz to 2.35KHz.
2.Check input Mic level in 3~15 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 –10.0 dB.
ii) 2.5KHz : +3.0 dB to +9.0 dB .
FILTER SET:
1.HPF 300Hz
2.LPF 3KHz
3. PK +
Page: 1 / 5
2.
Set TX mode CH14, Check the transmit power to
provide
0.17W ERP.
