Cleaning; Maintenance; Adjustments - Icom ic-751a Instruction Manual

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.
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