Kenwood NXR-800H, Service Manual

Page: 116 / 260

NXR-800H
116
ADJUSTMENT
Alignment
Item Condition
Measurement Adjustment
Specifi cations / Remarks
Test-
equipment
Unit Terminal Unit Parts Method
1. Setting 1) Connect the DC power output to the rear panel DC terminal (13.2V).
2) Connect the front panel COM port (D-sub 9 connector) to the PC serial port with a cross-wired cable.
3) Activate the FPU to go to the test mode.
2. Temperature
Sensor 1) Receive unit (Celsius or
Fahrenheit) Ther-
mometer Room
temper-
ature RX PC
ADJ Measuring room
temperature, write
the value with PC.
2) Transmit unit (Celsius or
Fahrenheit) TX
3. Driver
Amplifi er
Power
(Pre ADJ) 1) Low
2) High PC
ADJ Value: 1 Fixed value writing
4. RF Power
Down
Detection 1) High
2) Low PC
ADJ Value: 1 Fixed value writing
5. VCO Lock
Voltage 1) REF Low
SSG frequency: 10MHz
–10ppm (9.99999MHz)
SSG output: 0dBm SSG
DVM TX REF IN
REF CV
(CN401) Check 1.5V or more
2) REF High
SSG frequency: 10MHz
+10ppm (10.00001MHz)
SSG output: 0dBm 3.5V or less
3) MOD Low
SSG frequency: 10MHz
–10ppm (9.99999MHz)
SSG output: 0dBm REF IN
MB_CV1
(CN303) 1.5V or more
4) MOD High
SSG frequency: 10MHz
+10ppm (10.00001MHz)
SSG output: 0dBm 3.5V or less
6. Transmit
VCO Lock
Voltage
(Adjustment) 1) A: Low DVM TX CV TX L128 Adjust the interval of
the L128.
1.35~1.55V
2) B: Low L108 Adjust the interval of
the L108.
1.35~1.55V
7. Receive
VCO Lock
Voltage
(Adjustment)
Pre ADJ 1) A: Low DVM RX CV1 RX L28 Adjust the interval of
the L28.
1.55~1.60V Make the adjustments after
inserting the insulating tube
in the L28 and L30 coils and
applying the high frequency
varnish.
2) B: Low L30 Adjust the interval of
the L30.
1.85~1.90V
8. Fixation of
Oscillation
Coil 1) Apply the high-frequency varnish to the adjusted Transmit VCO coil (L128, L108) and cover it with a shield cover.
2) Apply the high-frequency varnish to the adjusted Receive VCO coil (L28, L30) and cover it with a shield cover.