Icom IC-775 Operating manual
MAINTENANCE
O
ICOM
|
1C-775
1C-775DSP
|
cue
INTRODUCTION
Thank
you
for
purchasing
the
IC-775
or
IC-775DSP.
Y
A\WARNING:
DISCONNECT
the
AC
This
guide
describes
installation
of
internal
units
or
power
cable
from
the
transceiver
and
wait
a
few
filters,
some
adjustment
procedures
and
fuse/battery
minutes
before
performing
any
work
on
the
trans-
replacement.
ceiver.
Bracketed
page
numbers
refer
to
the
instruction
manual.
OPENING
THE
TRANSCEIVER’S
CASE
Follow
the
case
and
cover
opening
procedures
shown
here
when
you
want
to
install
an
optional
unit
or
adjust
the
internal
units,
etc.
e
To
see
the
RF,
IF
and
PLL
units
()
Remove
6
screws
from
the
transceiver’s
top
and
4
screws
from
the
sides,
then
remove
the
top
cover.
@)
Turn
the
transceiver
upside
down.
3)
Remove
8
screws
from
the
bottom
cover,
then
remove
the
bottom
cover.
(4)
Now
you
can
see
the
RF,
IF
and
PLL
units.
Confirmation
beeps
sound
each
time
a
switch
is
pushed.
The
beep
volume
can
be
adjusted
as
follows.
()
Remove
the
top
cover
as
described
above.
2)
Set
[AF]
to
the
desired
audio
output
level.
@)
Turn
the
confirmation
beeps
ON
in
H-set
mode.
(p.
44)
@)
Rotate
R26
(see
right)
while
pushing
[SET]
to
obtain
the
desired
volume.
DISPLAY
DIMMER
ADJUSTMENT
The
low
intensity
of
the
display
backlighting
can
be
adjusted
as
follows.
()
Remove
the
top
cover
as
described
on
the
first
page.
@)
Select
low
intensity
for
the
display
dimmer
in
P-set
mode.
(p.
41)
@)
Rotate
R201
(see
right)
to
obtain
the
desired
intensity
as
shown
at
right.
Ul-100
DSP
UNIT
INSTALLATION
The
UI-100
DSP
UNIT
provides
noise
reduction,
DSP
@)
Insert
the
DSP
unit
into
the
slots
at
the
backside
modulation/demodulation,
DSP
filters,
auto
notch,
of
the
main
and
sub
dials.
auto
APF,
etc.
for
the
IC-775.
The
IC-775DSP
has
a
@
Tighten
the
2
supplied
screws
as
shown
below.
DSP
unit
as
standard.
()
Replace
the
top
cover.
Install
the
DSP
unit
as
follows:
()
Remove
the
top
cover
as
described
on
the
first
page.
@)
Connect
the
3
plugs
(attached
to
the
backside
of
the
front
panel)
to
the
appropriate
connectors
as
shown
below.
After
installation,
read
the
instruction
manual
as
for
a
“DSP-equipped
type”
transceiver.
The
[AF
LPF]
switch
functions
as
the
auto
notch
switch
in
SSB
mode
and
the
auto
APF
switch
in
CW
mode.
For
DSP
function
details,
refer
to
the
instruction
anual.
-
Noise
reduction
(p.
29)
-
DSP
modulation/demodulation
(p.
42)
-
DSP
filters
(p.
42)
-
Auto
notch
(p.
29)
-
Auto
APF/80
Hz
ultra
narrow
filter
(p.
30)
QQ
WWW
°F
Wwnaxs§yqIqAj\VQ
AC
VOLTAGE
SELECTION
Z\WARNING:
DISCONNECT
the
AC
power
cable
from
the
transceiver
and
wait
a
few
minutes
before
selecting
an
AC
power
voltage.
DR.
MX
QV
The
regulator
unit
in
the
IC-775DSP
can
be
switched
to
120
or
230
V
AC.
(
Remove
the
top
and
bottom
covers
as
described
on
the
first
page.
(2)
Remove
the
7
screws
and
the
[POWER]
switch
cover
as
shown
below.
aN
“UUUUUATAMNUTAN
“OUI
AY
aeegeal
ae
gN
t
ws
ww
ann
SS
@)
Remove
the
speaker,
tuner
unit,
PA
unit
and
regulator
unit
in
sequence.
Unplug
the
3
power
connectors
as
shown
below.
Speaker
PA
unit
Tuner
unit
©)
Remove
the
16
screws
to
remove
the
internal
shield
cover
of
the
regulator
unit.
©
Unplug
the
cable
as
shown
in
the
diagram
below,
then
connect
it
to
the
desired
volt-
age
position.
a
Ww
AC120v
ames!
[St
of
[eT
:
@)
Change
the
AC
fuse
to
an
appropriate
one.
(p.
56)
Replace
the
internal
shield
cover
and
plug
in
the
3
power
connectors.
Replace
the
regulator
unit,
then
check
the
movement
of
the
[POWER]
switch.
Replace
the
remain-
ing
units,
covers
and
screws.
o
ZA\WARNING:
DO
NOT
forget
to
change
the
AC
fuse
when
you
change
the
AC
input
voltage.
An
incorrect
fuse
may
pose
a
fire
hazard.
-
12
AFGMB
fuse
for
100-120
V
versions
-
5
Ahigh
breaking
capacity
fuse
for
220-240
V
versions
QQ.
K
GV.
OPTIONAL
FILTER
INSTALLATION
After
installing
optional
filters,
the
transceiver
has
3*
kinds
of
selectivity
for
2nd
and
3rd
IF
filters
to
provide
better
S/N
(signal-to-noise
ratio),
or
to
reject
nearby
interference.
*
FM
mode:
2
kinds
of
selectivity
Following
optional
filters
are
available.
passband
|
width|
Used.
selectivity»
FL-101|250Hz/—-6dB|CWnar.
FL-102|
6.0
kHz/—6
dB|
S~8
wide.
AM
med.,
FM
nar.
FL-223
|
1.9
kHz/—6
dB
FL-53A|
250
Hz/—6
dB
FL-222
|
1.9
kHz/—6
dB
When
only
1
filter
is
installed
for
selectivity,
such
as
a
FL-101
installed
but
no
FL-53A
installed,
optimum
performance
cannot
be
obtained
for
the
selectivity
and
the
twin
PBT
function
does
not
operate
correctly.
Both
filters,
such
as
FL-101
and
FL-53A,
should
be
installed.
4
FILTER
SELECTION
After
the
filter(s)
are
installed,
activate
the
op-
ional
filter(s)
in
H-set
mode.
(p.
47)
If
this
is
not
correctly
set,
the
installed
filter(s)
cannot
be
selected.
QA
A
AG
@
Remove
the
top
and
bottom
covers
as
described
on
the
first
page.
@)
Insert
the
filter(s)
to
the
proper
position.
The
locations
are
shown
in
the
figures
below.
-
The
FL-53A
and
FL-222
must
be
installed
in
the
proper
direction.
-
The
FL-101,
FL-102
or
FL-223
work
regardless
of
the
direction
they
are
installed
in.
@)
Replace
the
top
and
bottom
covers.
FL-102
(or
FL-101,
FL-223)
installation
Space
for
FL-101
—
—
Ky
AE
eh
ope
Space
for
FL-223
FL-222
(or
FL-53A)
installation
Space
for
FL-53A
UT-66
VOICE
SYNTHESIZER
UNIT
INSTALLATION
The
UT-66
announces
the
operating
frequency
or
selected
mode
in
a
clear,
electronically-generated
voice
(in
English
or
Japanese).
@)
Remove
the
top
cover
as
described
on
the
first
page.
(2)
Plug
the
UT-66
into
J1
on
the
MAIN
unit
(back-
side
of
the
S/RF
meter)
as
shown
in
the
figure
at
right.
@)
Replace
the
top
cover.
@
Set
the
language
and
speech
speed
in
H-set
mode.
(p.
44)
CR-282
HIGH-STABILITY
CRYSTAL
UNIT
INSTALLATION
By
replacing
the
original
crystal
unit
with
this
unit,
the
total
frequency
stability
of
the
trans-
ceiver
will
be
improved.
CR-282
frequency
stability:
+
0.5
ppm
(—30°C
to
+60
°C;
—22°F
to
+140°F)
Ribbon
cable
@
Remove
the
top
and
bottom
covers
as
described
on
the
first
page.
(2)
Remove
10
screws
from
the
PLL
unit
and
the
ribbon
cable
from
J11;
then
turn
over
the
PLL
unit
to
see
the
reverse
side.
(Fig.
1)
@)
Unsolder
the
leads
of
the
installed
crystal,
then
remove
the
crystal.
-
Use
a
desoldering
braid.
(4)
Unsolder
the
4
positions
on
the
PLL
unit
where
the
CR-282
will
be
installed.
©)
Install
the
CR-282
in
the
PLL
unit,
paying
attention
to
orientation.
-
Symbols
on
the
bottom
of
the
CR-282
must
be
identically
matched
with
symbols
on
the
P.C.
board.
6)
Bend
the
leads
of
the
CR-282
at
the
foil
side
of
the
P.C.
board
and
solder
them
as
shown
in
figure
2
at
right.
(7)
Trim
the
leads
even
with
the
solder
points.
Replace
the
PLL
unit,
ribbon
cable
and
covers.
After
changing
the
crystal
unit,
frequency
adjustment
is
necessary
with
L4
on
the
PLL
unit.
-Ask
your
Icom
Dealer
or
Icom
Service
Center
for
details.
NOTE:
The
CR-282
is
an
oven-heat-type
crystal
unit,
and
the
specified
frequency
stabil-
ity
described
above
is
guaranteed
1
min.
after
power
ON.
FUSE
REPLACEMENT
ZAWARNING:
DISCONNECT
the
AC
power
cable
and
wait
a
few
minutes
before
GZ,
opening
the
top
and
bottom
covers.
XQ
GK
The
transceiver
has
an
external
DC
line
fuse
inde-
pendent
of
the
AC
line
fuse.
This
fuse
is
installed
under
the
bottom
cover.
If
the
fuse
blows,
try
to
find
the
source
of
the
problem,
and
replace
the
damaged
fuse
with a
new,
rated
fuse.
()
Remove
the
top
and
bottom
covers
as
described
on
the
first
page.
@)
Replace
the
damaged
fuse
with
a
new,
rated
fuse
as
shown
at
right.
@)
Replace
the
top
and
bottom
covers.
2
A
FGB
fuse
for
100
—
120
V
versions
2
A
high
breaking
capacity
fuse
for
220
—
240
V
versions
BACKUP
BATTERY
REPLACEMENT
The
transceiver
has
a
lithium
backup
battery
on
the
inside
of
the
front
panel
(MAIN
unit)
for
retaining
operating
conditions.
The
usual
life
of
the
backup
battery
is
approximately
5
years.
When
the
backup
battery
is
exhausted,
the
trans-
ceiver
transmits
and
receives
normally
but
cannot
retain
operating
conditions
except
for
memory
chan-
nels.
Yj
CAUTION:
If
the
lithium
battery
is
incorrectly
Y
replaced,
it
could
explode.
Replace
with
a
Y
CR-2032
or
equivalent
type.
(
Remove
the
top
and
bottom
covers
as
described
on
the
first
page.
(2)
Remove
8
screws
from
the
front
panel
as
shown
in
figure
1
at
right.
@)
Remove
the
front
panel.
@)
Replace
the
backup
battery
as
shown
in
figure
2
at
right.
(6)
Reassemble
the
front
panel.
-
Check
that
the
[POWER]
switch
works
smoothly.
©
Replace
the
top
and
bottom
covers.
Yy
CAUTION:
After
replacing
the
lithiurn
battery,
turn
power
ON
and
OFF,
otherwise,
the
lithium
%
battery
will
become
exhausted
rapidly.
Icom
Inc.
6-9-16,
Kamihigashi,
Hirano-ku,
Osaka
547,
Japan
Top
side
Mics)
Bottom
side
:©
(®
terminal
is
visible
after
installation.)
Count
on
us!
A-5340S-2EX
Printed
in
Japan
Copyright
©
1995
by
Icom
Inc.
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