Giant SX700 Alignment Procedure

GIANT ELECTRONICS LTD.
Title: Alignment Procedure
Model: SX700
A. PCB LEVEL (Test Condition: under CH15, Supply=5.2Vdc)
NO ITEM
1. LCD display
(Should enter test
mode)
2. Standby current
3. Talk on current
(Power supply 5.2V
DC)
4. VCO
5. TX Power
(Power supply 5.2V
DC)
6. TX Frequency
7. CTCSS Tone
Frequency
8. CDCSS Frequency
9. CTCSS Tone Dev.
10. TX Modulation
& distortion
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 '-' key , then all LCD segments should be
anticlockwise displayed.
4. 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 <80mA 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.
1. Set RX or TX mode
2. Check TP503 to provide 0.7~2.3VDC .
3. Adjust L509 to provide 2.2
level are more than 2.4VDC on CH14.
4. Set WX mode, check TP504 to provide 0.7~2.4VDC
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
2. Set TX mode CH14, Check the transmit power to
Low-power to provide 400±30mW
provide 0.17W ERP.
3. Set TX mode CH14, Check the transmit power to
provide 550±200mW .
1. Set TX mode
2. Adjust VC501 to provide 462.5500MHz
1. Set CH15/CODE1 and Tx mode.
2. Check CTCSS tone frequency to be within 66.8Hz to
67.2Hz.
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
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.
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 .
Date: Feb 26, 2005
CH
'.
88.
.
VDC at TP503 if VCO
± 0.1
50Hz.
±
REMARK
***
FILTER SET:
1.Input Level:
0.9KHz
FILTER SET:
1.50HZ~300HZ
2.750µs De-emp
ON
3. PK+
4. FM DEV. AVG
ON
FILTER SET:
1.HPF 300Hz
2.LPF 3KHz
3. PK +
Page: 1 / 5