Icom IC-725 Service Manual page 30

TRANSMITTER ADJUSTMENT
(CONTINUED)
ADJUSTMENT
ADJUSTMENT
CONDITIONS
MEASUREMENT
VALUE
ADJUSTMENT
POINT
UNIT
LOCATION
UNIT
ADJUST
SWR
DETECTOR
1
• Displayed frequency:
14.10000
MHz
•
Mode
:
USB
•
[RF
PWR]
control
:
Max.
CW
• Connect a jumper
wire
between R87
front side
and
ground.
»
• Appiy an
RF
signai to
the [MIC]
connector.
Level
:
10
mV/
1.5
kHz
• Transmitting
Rear
panel
Connect
the
RF
power meter
to
the
antenna connector.
100
w
Front
panel
[MIC]
control
2
MAIN
Connect
the
DC
voltmeter to
J6 pin
2.
Minimum FILTER
1
3
After
adjustment,
remove
the
jumper
wire
from R87.
TRANSMIT
GAIN
1
•
Dispiayed frequency:
14.10000
MHz
•
Mode
:
USB
•
[RF
PWR]
controi
:
Max.
CW
•
Appiy an
AF
signai to
the [MiC]
connector.
Level :1
mV/1.5 kHz
• Transmitting
Rear
panel
Connect
the
RF
power meter
to
the
antenna connector.
Pre-set to
max.
CCW.
MAIN
R85
50
W
Front
panel
[MIC]
control
Maximum
level
MAIN
L37, LI
7,
L16, L14,
L7
2
•
[MIC] control
:
Max.
CW
50
W
R85
NOTE:
Adjust the [MIC]
control to
keep
the output
power
at
50
W
for
each adjustment.
OUTPUT
POWER
1
•
Displayed frequency:
1.91000
MHz
•
Mode
:
CW
•
[RF
PWR]
control
:
Max.
CW
•
Connect a
key
to
the
[KEY] jack and
keep the key down.
Rear
panel
1
Connect
the
RF
power meter
to
the
antenna connector.
Pre-set to max'.
CCW. MAIN
i
R194,
R241
2
100
W
R210
3
•
[RF
PWR]
control
:
Max.
CCW
10
W
R208
1
Repeat
steps
2 and
3
a couple
of times.
Ic
APC
1
•
Displayed frequency:
14.10000
MHz
•
Mode
:
CW
• [RF
PWR]
control
:
Max.
CW
•
Connect a jumper
wire
between
J6
pin 3
and
ground.
• Connect a
key
to the
[KEY] jack
and
keep
the
key down.
Rear
panel
Connect
the
ammeter
between
the
AC
power
supply
and
IC-725.
22
A
MAIN
R194
2
After
adjustment,
remove
the
jumper
wire
from J6
pin
3.
Po
METER
1
•
Displayed frequency:
14.10000
MHz
•
Mode
:
CW
•
[RF
PWR]
control
:
Max.
CW
• Connect a key
to
the
[KEY]
jack
and
keep the key down.
Front
panel
Meter
100
%
(full
scale)
MAIN R186
CW
DELAY
TIME
1
•
Displayed frequency:
14.10000
MHz
•
Mode
:
CW
• [BK
IN] switch
:ON
•
[DELAY]
control
:
Max.
CCW
•
Connect an
external electronic
keyer
to
the [KEY] jack
and
close the
key.
MAIN
Connect
the
oscilloscope to J1
1
and
the electronic
keyer.
Adjust as follows:
Keying
112
msec.'
MAIN
R241