Icom IC-725 Instruction Manual

MAINTENANCE
AND ADJUSTMENT
g
(3)
RIT
CONTROL
*
ADJUSTMENT
POSITION
1)
Rotate
the
[RIT]
control
to the
center position
and
turn
OFF the
RIT
function
if it is
turned
ON.
2)
Receive
WWV
or
another
signal
emitted as
a
single
tone
from
the
speaker
while in LSB,
USB
or CW
mode.
3)
Push the
[RIT]
switch to
turn
ON the
RIT
function
and
adjust
R70
on the
PLL
UNIT as
shown
at
left to
the same
tone
pitch as
that
received.
4)
Turn
OFF
and ON
the RIT
function to
compare two
tone
pitches
and adjust
"R70
until both
tone pitches
are
the
same.
(4)
SCAN
FUNCTION
•
FRONT PANEL
REMOVAL
•
DIODE
INSTALLATION LOCATION
(Fig.
7)
Dzo
Insert a
diode as
shown
in
the
diagram at
left.
By inserting
a silicon diode
(sold
separately)
in the
position
indicated,
the
following
functions
can be
changed:
DIODE
DEFAULT
AFTER
MODIFICATION
REF.
D20 Scan
resume
Scan clear
p.
23
D21 Faster
scan
speed
Slower
scan
speed
p.
23
D22
Faster
scan
speed
with
mic
[UP]
/[DOWN]
Slower
scan
speed
with
mic
[UP]
/[DOWN]
p.
3
1)
Unscrew the
6 screws and
remove
the
front
panel
from
the transceiver
body.
2)
Diode
leads should
be
bent
and cut
before
inserting
them
into the P.C.
board.
3)
Insert
a diode.
Make sure
it
is inserted
in the
proper
direction
and in
the desired
position.
4)
Solder
leads.
(5)
BFO
The BFO
adjustment
requires
an
accurate
frequency
counter
(less
than
±1
ppm).
Connect the frequency
counter
to
R266 on
the MAIN
UNIT.
See
p.
31
for
the
exact
location.
Make
the
adjustments
shown
in
the
table
at right
in
numerical
order.
MODE FREQUENCY ADJUSTMENT
1 USB 9.01300
MHz
C294
2
CW
transmit
9.01060
MHz
L83
3 LSB
9.01000
MHz
L82
4
CW
receive
9.00980
MHz
Verify
5
AM No oscillation
(6)
OTHER
ADJUSTMENTS
See
pgs. 31
and
32
for
information
regarding
other
adjustments.

Icom IC-725 Specifications

General

Brand	Icom
Model	IC-725
Category	Transceiver
Language	English