Icom IC-R75 Service Manual page 16

4-3 RECEIVER ADJUSTMENTS
ADJUSTMENT ADJUSTMENT CONDITION
RECEIVER 1 • Displayed frequency
SENSITIVITY
• Mode
• PREAMP1
• ANT select
• AGC
• NOISE BLANKER : OFF
• RF/SQL
• PBT1/PBT2
• IF FILTER1
• IF FILTER2
2
• Connect an SSG to the antenna
connector1 and set as:
Frequency
Level
Modulation
• Receiving
1ST MIXER 1
• Displayed frequency
BALANCE
• PREAMP1
• set an SSG level as
• Receiving
*This output level of the standard signal generator (SSG) is indicated as SSG's open circuit.
• MAIN UNIT
MEASUREMENT
UNIT
Rear
: 14.10000 MHz Panel
: USB
: ON
: ANT1
: FAST
: CENTER
: CENTER
: 2.4 kHz
: 2.4 kHz
: 14.10150 MHz
: 22 µV*
(–13 dBµ)
: OFF
Rear
panel
: 0.10000 MHz
: OFF
: OFF
4 - 4
LOCATION
Connect the AC Pre-set to center
milli-volt meter to
the [EXT SP] jack
with an 8 Ω load.
Maximum output level
Connect an oscillo- Minimum noise level
scope to the [EXT
SP] jack with 8 Ω
load.
EXT SP JACK
Receiver sensitivity and 1st mixer balance
check point
R444
L443
L701
L711
L712
L471
L462
L461
L443
L891
L892
L911
R893
R444
ADJUSTMENT
POINT
VALUE
UNIT ADJUST
MAIN
MAIN
MAIN
1st mixer balance adjustment
Receiver sensitivity adjustment
Pre-set to center before
receiver sensitivity adjustment
R444
R898
L443,
L461,
L462,
L471,
L701,
L711,
L712,
L891,
L892,
L911
L443,
R444