SECTION
12
MAINTENANCE
AND
ADJUSTMENT
12-1
CLEANING After
sitting in
your
ham
shack
for
a
period of time, the IC-751
A
will eventually require cleaning.
Remove the knobs from the front
panel and use
a
mild,
soapy solution sparingly. Do not use strong
chemicals or cleaning solvents.
Wipe dry
before replacing the knobs
on the
panel.
12-2
MAINTENANCE
NOTE:
Before performing
any work on the transceiver, make
sure that the power cable
is
detached from
the
trans-
ceiver.
(1)
PREPARATION
Remove the
top
and bottom covers by unscrewing the six screws
from
each
cover and the three screws from
each
side of the
trans-
ceiver.
(2)
FUSE
Locate the
cause
for
a blown
fuse before
replacing it and attempting
to operate
the
IC-751 A again.
Fuse
Ratings:
•Inside
IC-751 A 3A
•Supplied DC cable
: 20A
•Optional IC-PS35
POWER SUPPLY-: 10Afor120VAC
5A for 220
~
240V
AC
(3)
BACKUP
BATTERY
The
backup
battery location is shown in
SECTION
13
-
2 .
(4)
ORDERING PARTS
12
-3
ADJUSTMENTS
(1)
BRAKE ADJUSTMENT
’
—Brake adjustment
screw
It is unnecessary to remove the bottom cover for the
brake adjustment.
The IC-751 A uses an
advanced, highly
reliable RAM integrated
circuit which
is
completely separate from
the
transceiver's main
microprocessor. The purpose of the battery is
to
provide power to
the
RAM
so
it retains all
memory
information during power
failures,
or when
the unit is
unplugged
or turned off.
The
usual life
of the
lithium battery
exceeds ten years.
It
is
advisable
to
monitor
the
lithium
battery carefully and
replace
it
if
there are repeated cases of display malfunction.
NOTE: Battery
replacement must be done by an ICOM
Authorized Dealer or
ICOM Service Center.
For the
fastest service, supply all of the following information when
ordering
parts from your
dealer:
•Equipment model arid serial number
•Schematic
part
identifier (e.g.
IC5,
Q23)
•Printed circuit
board number
•Part number
and
name
•Quantity required
The
TUNING
CONTROL tension
may be
adjusted
to the operator's
preference. The screw adjustment is located on the bottom side of
the
transceiver
cabinet below the TUNING CONTROL. The method
for adjustment
is as
follows:
1)
Rotate the TUNING CONTROL continuously
and smoothly in
one direction.
2)
Adjust
the
brake adjustment screw either
clockwise
for
tighter
tension, or counterclockwise for
looser tension
as
desired.
-53
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