Icom IC-775

RECEIVER
ADJUSTMENT
(CONTINUED)
ADJUSTMENT
ADJUSTMENT CONDITIONS
MEASUREMENT
VALUE
ADJUSTMENT
POINT
UNIT LOCATION
UNIT ADJUST
DUALWATCH
1
.
[SPLIT! ;
ON
•
Main
frequency readout : 14.1 00000 MHz
•
Mode
USB
.
[PREAMP/ATT] : OFF
.
[ANT]
: 1
•
Connect
a
standard signal
generator to
[ANTI]
and
set as:
Frequency: 14.101500 MHz
Level :
1
jiV
*
(-1 07 dBm)
Rear
panel
Connect
an
AC
millivolt-
meter to [EXT SP]
jack
with
an
8 Q
dummy load.
Maximum audio
output level
RF L16
2 •
Main frequency
readout : 1
00
kHz
•
Apply no signal to the antenna
connector.
Minimum noise
level
R24
PREAMP
2
1 •
Displayed frequency: 23.000000
MHz
.
Mode
: USB
.
(PREAMP/ATT] :
PRE 2
.
[ANT] : 1
•
Connect a
standard
signal generator to
[ANTI] and set
as:
Frequency: 23.001500 MHz
•
Receiving
Rear
panel
Connect an AC
millivolt-
meter to
(EXT SP]
jack
with an 8 fi dummy
load.
Maximum audio
output
level
RF L80
NOTCH 1 •
Same settings as "AGC
VOLTAGE"
• [NB]
:
OFF
•
[NOTCH]
:
ON
•
Connect a
standard signal
generator to
[ANTI] and set as:
Frequency:
14.101500 MHz
Level : 1
0
mV
*
(-27 dBm)
Front
panel
S/RF meter
Minimum level Front
panel
[NOTCH]
control
2
Minimum level
(-45 dB or more
from Notch OFF)
IF Cl
25,
R193
NOISE
BLANKER
1
•
Same
setting as "AGC
VOLTAGE"
.
[NB WIDE] : OFF
.
[PREAMP/ATTj : OFF
•
Connect
a
standard signal
generator to
[ANTI] and set
as:
Frequency: 14.101500
MHz
Level
: 1
0
pV
*
(-87
dBm)
Add
the following signal
into the signal
generator output.
-HH-
1 msec.
IF
Connect an oscilloscope
to CP2.
Maximum
voltage
IF L9,
L10,
L11
METER
SCALE
1
•
[RF]
Max. clockwise
•
[SQL] : 3
o'clock position
•
Receiving
Front
panel
S/RF meter
S9
+ 30 dB
DIS-
PLAY
R3
S-METER
1 •
Same
setting
as
"AGC VOLTAGE"
.
[PREAMP/ATT]
:
OFF
•
Connect a standard
signal generator
to
[ANT
1]
and
set as:
Level :
50
pV
*
(-73 dBm)
Front
panel
S/RF
meter
S9
IF
R386
2
•
Set the
standard signal generator as:
Level : 50
mV
*
(-13 dBm)
S9
+ 60 dB
R453
FM
SQUELCH 1 •
Displayed frequency :
29.100000 MHz
•
Mode
FM
.
[PREAMP/ATT] : PRE 2
•
Apply no signal to the antenna
connector.
Top
panel
Speaker Squelch just
closes.
Front
panel
[SQL]
control
2 •
Connect
a
standard signal
generator
to
[ANTI] and set
as:
Frequency: 29.100000
MHz
Level :
0.16
pV
*
(-123 dBm)
Squelch just
opens.
R233
*
This output
level of the
standard signal generator (SSG) is indicated as SSG's
open circuit.
5-6