Kenwood NXR-800 Service Manual page 74

NXR-800
Alignment
Item Condition
1. Setting 1) Connect the DC power output to the rear panel DC terminal (13.8V).
2) Connect the front panel COM port (D-sub 9 connector) to the PC serial port with a cross cable.
3) Activate the FPU to go to the test mode.
2. Temperature 1) Receive unit (Celsius or
Sensor Fahrenheit)
2) Transmit unit (Celsius or
Fahrenheit)
3. Driver 1) Low
Amplifi er 2) Center
Power 3) High
(Pre ADJ)
4. RF Power 1) High
Down 2) Low
Detection
5. Maximum 1) NXDN Narrow
Deviation
(NXDN) 2) NXDN Very Narrow
6. VCO Lock 1) REF Low
Voltage SSG frequency : 10MHz
SSG output: –10dBm (70.7mV)
2) REF High
SSG frequency: 10MHz
SSG output: +10dBm (708mV)
3) MOD Low
SSG frequency: 10MHz
SSG output: –10dBm (70.7mV)
4) MOD High
SSG frequency: 10MHz
SSG output: +10dBm (708mV)
7. Transmit 1) A: Low
VCO Lock
Voltage
(Adjustment)
2) B: Low
8. Receive 1) A: Low
VCO Lock
Voltage
(Adjustment)
2) B: Low
9. Fixation of 1) Apply the high-frequency varnish to the adjusted Transmit VCO coil (L128, L108) and cover it with a shield cover.
Oscillation 2) Apply the high-frequency varnish to the adjusted Receive VCO coil (L28, L30) and cover it with a shield cover.
Coil
10. Transmit 1) A: High
VCO Lock
Voltage
2) B: High
(Check)
74
ADJUSTMENT
Measurement
Test-
Unit Terminal Unit
equipment
Ther-
mometer
SSG TX REF IN
DVM REF CV
REF IN
MB_CV1
DVM TX CV TX
DVM RX CV1 RX
DVM TX CV
Adjustment
Parts Method
Measuring room
temperature, write
the value with PC.
PC Value: 1 Fixed value writing
ADJ
PC Value: 1 Fixed value writing
ADJ
PC Value: 22800 Fixed value writing
ADJ
Value: 10000
Check 1.5V or more
3.5V or less
1.5V or more
3.5V or less
L128 Adjust the interval of ±0.05V
the L128.
1.60V
L108 Adjust the interval of ±0.05V
the L108.
1.60V
L28 Adjust the interval of
the L28.
0.90~0.95V
L30 Adjust the interval of
the L30.
1.05~1.10V
Check 3.6~4.2V
Specifi cations / Remarks