Kenwood NXR-800 Service Manual Supplement page 52

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. 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)
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
the L128.
1.35~1.55V
L108 Adjust the interval of
the L108.
1.35~1.55V
L28 Adjust the interval of Make the adjustments after
the L28. inserting the insulating tube
0.90~0.95V in the L28 and L30 coils and
applying the high frequency
L30 Adjust the interval of
varnish.
the L30.
1.05~1.10V K
1.10~1.15V K2
Check 3.6~4.2V
Specifi cations / Remarks