Transmitter Adjustment - Icom IC-726 Service Manual

6-4
TRANSMITTER ADJUSTMENT
ADJUSTMENT
ADJUSTMENT CONDITIONS
MEASUREMENT
VALUE
ADJUSTMENT
POINT
UNIT
LOCATION
UNIT
ADJUST
PA
Unsolder
W14
and
connect the
ammeter
to
the unsoldering
points.
50
mA
PA
R8
[BSji
1
ammeter
©
i
Unsolder
C11
side
PA
Unsolder
R26
and
connect the
ammeter
to
the unsoldering
points.
300
mA
PA R19
IDLING
CURRENT
®
For drive
transistors
I
®
For
final
transistors
>
Displayed frequency;
14.10000
MHz
>
Mode
;
CW
•
[TRANSMIT]
switch: IN
>
[KEY] jack
:
No
connection
ammeter
O
0 0
i|
R26
®
D
1©
Unsolder
PA
UNIT
After adjustment, re-solder
W14
and R26.
HF
SWR
DETECTOR
1
• Displayed frequency: 14.10000
MHz
•
Mode
:
USB
•
[RF
PWR]
control
:
Max.
CW
•
Connect
the
jumper wire
between
R87
(front side)
and
a ground.
•
Attach the audio generator
to
the
[MIC]
connector and
set as;
Level
:
10
mV
Modulation: 1.5
kHz
• Transmitting
Rear
panel
Connect
the
RF
power meter
to the
[HF ANT]
connector.
100
w
[MIC]
control
2
MAIN Connect
the
DC
voltmeter to J6, pin
2.
Minimum FILTER
C54
3 After
adjustment,
remove
the
jumper
wire
from R87.
50
MHz
SWR
DETECTOR
1
• Displayed frequency:
52.00000
MHz
•
Mode
:
USB
•
[RF
PWR]
control
:
Max.
CW
•
Connect
the
jumper
wire
between
R87
(front side)
and
a ground.
•
Attach
the audio
generator
to
the
[MIC] connector and set as;
Level
:
1
0
mV
Modulation
:
1
.5
kHz
•
Transmitting
Rear
panel
Connect
the
RF
power
meter
to the
[50
MHz
ANT]
connector.
10
W
Front
panel
[MIC]
control
2
FILTER
Connect
the
DC
voltmeter to LI
7.
Minimum
PB C23
3 After adjustment,
remove
the
jumper wire
from R87.
6
—
8