Icom IC-725 Service Manual page 27

6-3
RECEIVER
ADJUSTMENT
ADJUSTMENT
ADJUSTMENT
CONDITIONS
MEASUREMENT
VALUE
ADJUSTMENT
POINT
UNIT
LOCATION UNIT
ADJUST
BFO
FREQUENCY
1
•
Displayed frequency;
14.10000
MHz
•
Mode
;
USB
• Receiving
•
MAIN
Connect
the
frequency counter
to
R266.
9.01300
MHz MAIN C294
2 •
Mode
:
CW
• Transnfiitting
9.01060
MHz
L83
3 •
Mode
:
LSB
• Receiving
9.01000
MHz
L82
1
•
Mode
:
CW
9.00980
MHz
(±150
Hz)
Verify
5
•
Mode
:
AM
No
output
SENSITIVITY
1
• Displayed frequency:
14.10000
MHz
•
Mode
:
USB
• [RIT] svritch
;
OFF
•
[AGO]
switch
:
IN
(Fast)
•
[ATT] switch
:
OFF
•
[NB]
switch
:OFF
•
[PRE] switch
:
ON
•
[SQL] control :Max.
CCW
• Set the
signal
generator;
Level
;
0.16
pV (-123 dBm)
Modulation
:
OFF
•
Receiving
Rear
panel
Connect the
AC
milli-
voltmeter
to
the
[EXT SP] jack with
an 8
O
load.
Pre-set to
max.
CW. MAIN R138
Maximum
audio output
ievei
L33, L34,
L35, L36,
LI
6,
LI
7,
L21, L22,
L23, L79,
L78,
L77
TOTAL GAIN
1
• Displayed frequency: 14.10000
MHz
•
Mode
:
USB
•
[PRE] switch
:
OFF
•
Set the
signai
generator;
Level
:
1.0
mV
(-47 dBm)
Modulation:
OFF
• Receiving
Rear
panel
Connect the
AC
milli-
voltmeter to the
[EXT SP] jack with
an 8
Q
load.
1.0
V(OdB)
Front
panel
[AF]
control
2
• Set the
signai
generator;
Level
:
OFF
30
mV
(-30
dB)
MAIN
R138
S-METER
1
• Displayed frequency:
14.10000
MHz
•
Mode
:
USB
•
[PRE] switch
:
OFF
• Set the signai generator;
Level
:
50
pV (—73 dBm)
Modulation;
OFF
• Receiving
Front
panel
Meter S9
MAIN R116
2 • Set the
signai
generator;
Level
:
50
mV
(
-
1
3
dBm)
S9-I-60
dB
R110
3
Repeat above
adjustments
1
and 2 a couple
of times.
6
—
4