Receiver Adjustment - Icom IC-R75 Service Manual

RECEIVER ADJUSTMENTS (CONTINUED)
ADJUSTMENT ADJUSTMENT CONDITION
NOISE 1 • Displayed frequency
BLANKER
• Mode
• Noise Blanker
• PREAMP1.
• Set an SSG as
Frequency
Level
Modulation
2 • Apply the following signal to the
[ANT1] connector
1 msec.
*This output level of the standard signal generator (SSG) is indicated as SSG's open circuit.
• MAIN UNIT
: 14.10000 MHz
: USB
: OFF
: ON
: 14.10000 MHz
: 18 µV*
(25 dBµ)
: OFF
100 msec.
MEASUREMENT
UNIT LOCATION
MAIN Connect the oscillo-
scope to the check
point CP731.
Rear Connect the oscillo-
Panel scope to the [EXT
SP] jack with an 8 Ω
load.
EXT SP JACK
Noise blanker check point after apply the noise signal
R736
• Pre-set to center before apply the noise signal
• Noise blanker adjustment after apply the noise signal
L731
L732
Noise blanker adjustment before apply the noise signal
CP731
Noise blanker check point before apply the noise signal
4 - 6
ADJUSTMENT
VALUE
UNIT
Pre-set to center MAIN
Minimun voltage
Noise is blanked MAIN
when the [NB] switch
is ON.
POINT
ADJUST
R736
L731,
L732
R736