Information; Adjustments - 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.