Kenwood NX-300 Service Manual page 104

NX-300
Receiver Section
Item
Panel tuning mode
1. AF level [Panel test mode]
setting 1) CH-Sig: 1-1
SSG output:
–47dBm (1mV)
(MOD:
1kHz/±1.5kHz)
Wide/Narrow: Nar-
row
Beat Shift: Uncheck
Compander: Uncheck
2. Sensitivity 1 1) Adj item: [SENS1]
adjust Adjust: [✳✳✳]
2) Adj item:
[L SENS1]→
[L' SENS1]→
[C SENS1]→
[H' SENS1]
Adjust: [✳✳✳]
Press [ ] key to
store the adjust-
ment value.
3) Adj item: [H SENS1]
Adjust: [✳✳✳]
Caution:
Perform the step 3 adjustments of "3. Sensi-
tivity 2 adjust" before performing the
[H SENS1] adjustment.
SSG output:
–118dBm (0.28µV)
(MOD:
1kHz/±1.5kHz)
Press [ ] key to
store the adjust-
ment value.
104
ADJUSTMENT
Condition
PC test mode
equipment
1) Test Channel SSG
Channel: 1 DVM
Test Signaling AF VTVM
Mode: Analog Dummy
Signaling: 1 load
Wide/Narrow: Nar-
row
Beat Shift: Uncheck
Compander: Uncheck
SSG output:
–47dBm (1mV)
(MOD: 1kHz/±1.5kHz)
1) Adj item: SSG
[Sensitivity 1] AF VTVM
2) Adj item: [Low], Oscilloscope
[Low'], [Center],
[High']
Press [Apply All]
button to store the
adjustment value.
3) Adj item: [High]
SSG output:
–118dBm (0.28µV)
(MOD:
1kHz/±1.5kHz)
Press [Apply All]
button to store the
adjustment value.
Measurement
Test-
Unit Terminal Unit
Panel ANT Panel
Universal
connector
Panel ANT Panel
Universal
connector
Adjustment
Specifi cations /
Parts Method
Volume Turn the Volume 0.63V±0.1V
knob knob to obtain
0.63V AF output.
[Panel Write the value as
tuning followings
mode] [L SENS1] / [Low]
[ ], : 100
[ ] [L' SENS1] / [Low']
: 115
[PC test [C SENS1] / [Center]
mode] : 128
[ ],[ ] [H' SENS1] / [High']
: 142
Increase the adjust-
ment value from 1
to get 12dB SINAD.
Note:
If the SINAD value
is less than 12dB
SINAD, conduct the
following.
At fi rst, apply "104"
as the temporary
value for "Sensitiv-
ity 1 [High]".
Next, decrease
"Sensitivity 2
[High]" from "256"
until the SINAD
value becomes
13dB SINAD, then
apply the adjust-
ment value.
(Keep this "Sensi-
tivity 2 [High]" ad-
justment value and
no need to restore
the adjustment
value to "256".)
Finally, increase
"Sensitivity 1
[High]" adjustment
value from 1 to get
12dB SINAD.
Remarks