Kenwood NXR-700 Service Manual page 52

NXR-700
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. VCO Lock 1) REF Low
Voltage SSG frequency: 10MHz
–10ppm (9.99999MHz)
SSG output: –10dBm
2) REF High
SSG frequency: 10MHz
+10ppm (10.00001MHz)
SSG output: +10dBm
3) MOD Low
SSG frequency: 10MHz
–10ppm (9.99999MHz)
SSG output: –10dBm
4) MOD High
SSG frequency: 10MHz
+10ppm (10.00001MHz)
SSG output: +10dBm
6. Transmit 1) A: Low
VCO Lock
Voltage
(Adjustment)
2) B: Low
7. Receive 1) A: Low
VCO Lock
Voltage
(Adjustment)
Pre ADJ
2) B: Low
8. 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
9. Transmit 1) A: High
VCO Lock
Voltage
2) B: High
(Check)
52
ADJUSTMENT
Measurement
Test-
Unit Terminal Unit
equipment
Ther- Room RX
mometer temper-
ature
TX
SSG TX REF IN
DVM REF CV
(CN401)
REF IN
MB_CV1
(CN303)
DVM TX CV TX
DVM RX CV1 RX
DVM TX CV
Adjustment
Parts Method
PC Measuring room
ADJ temperature, write
the value with PC.
PC Value: 1 Fixed value writing
ADJ
PC Value: 1 Fixed value writing
ADJ
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.
1.30V K
1.50V K2
L108 Adjust the interval of ±0.05V
the L108.
1.30V K
1.50V K2
L28 Adjust the interval of ±0.05V
the L28.
1.1V K
1.3V K2
L30 Adjust the interval of ±0.05V
the L30.
1.1V K
1.3V K2
Check 4.4V or less K
3.8V or less K2
Specifi cations / Remarks