Icom IC-775 Manuale operativo

MAINTENANCE

ICOM

1C-775

1C-775DSP

cue

INTRODUCTION

Thank

you

for

purchasing

the

IC-775

IC-775DSP.

A\WARNING:

DISCONNECT

the

This

guide

describes

installation

internal

units

power

cable

from

the

transceiver

and

wait

few

filters,

some

adjustment

procedures

and

fuse/battery

minutes

before

performing

any

work

the

trans-

replacement.

ceiver.

Bracketed

page

numbers

refer

the

instruction

manual.

OPENING

THE

TRANSCEIVER’S

CASE

the

case

and

cover

opening

procedures

shown

here

when

you

want

install

optional

unit

adjust

the

internal

units,

etc.

see

the

RF,

and

PLL

units

()

Remove

screws

from

the

transceiver’s

top

and

screws

from

the

sides,

then

remove

the

top

cover.

Turn

the

transceiver

upside

down.

Remove

screws

from

the

bottom

cover,

then

remove

the

bottom

cover.

(4)

Now

you

can

see

the

RF,

and

PLL

units.

Confirmation

beeps

sound

each

time

switch

pushed.

The

beep

volume

can

adjusted

follows.

()

Remove

the

top

cover

described

above.

Set

[AF]

the

desired

audio

output

level.

Turn

the

confirmation

beeps

H-set

mode.

(p.

44)

Rotate

R26

(see

right)

while

pushing

[SET]

obtain

the

desired

volume.

DISPLAY

DIMMER

ADJUSTMENT

The

low

intensity

the

display

backlighting

can

adjusted

follows.

()

Remove

the

top

cover

described

the

first

page.

Select

low

intensity

for

the

display

dimmer

P-set

mode.

(p.

41)

Rotate

R201

(see

right)

obtain

the

desired

intensity

shown

right.

Ul-100

DSP

UNIT

INSTALLATION

The

UI-100

DSP

UNIT

provides

noise

reduction,

DSP

Insert

the

DSP

unit

into

the

slots

the

backside

modulation/demodulation,

DSP

filters,

auto

notch,

the

main

and

sub

dials.

auto

APF,

etc.

for

the

IC-775.

The

IC-775DSP

has

Tighten

the

supplied

screws

shown

below.

DSP

unit

standard.

()

Replace

the

top

cover.

Install

the

DSP

unit

follows:

()

Remove

the

top

cover

described

the

first

page.

Connect

the

plugs

(attached

the

backside

the

front

panel)

the

appropriate

connectors

shown

below.

After

installation,

read

the

instruction

manual

for

“DSP-equipped

type”

transceiver.

The

[AF

LPF]

switch

functions

the

auto

notch

switch

SSB

mode

and

the

auto

APF

switch

mode.

For

DSP

function

details,

refer

the

instruction

anual.

Noise

reduction

(p.

29)

DSP

modulation/demodulation

(p.

42)

DSP

filters

(p.

42)

Auto

notch

(p.

29)

Auto

APF/80

ultra

narrow

filter

(p.

30)

WWW

°F

Wwnaxs§yqIqAj\VQ

VOLTAGE

SELECTION

Z\WARNING:

DISCONNECT

the

power

cable

from

the

transceiver

and

wait

few

minutes

before

selecting

power

voltage.

DR.

The

regulator

unit

the

IC-775DSP

can

switched

120

230

AC.

(

Remove

the

top

and

bottom

covers

described

the

first

page.

(2)

Remove

the

screws

and

the

[POWER]

switch

cover

shown

below.

“UUUUUATAMNUTAN

“OUI

aeegeal

ann

Remove

the

speaker,

tuner

unit,

unit

and

regulator

unit

sequence.

Unplug

the

power

connectors

shown

below.

Speaker

unit

Tuner

unit

©)

Remove

the

screws

remove

the

internal

shield

cover

the

regulator

unit.

Unplug

the

cable

shown

the

diagram

below,

then

connect

the

desired

volt-

age

position.

AC120v

ames!

[St

[eT

Change

the

fuse

appropriate

one.

(p.

56)

Replace

the

internal

shield

cover

and

plug

the

power

connectors.

Replace

the

regulator

unit,

then

check

the

movement

the

[POWER]

switch.

Replace

the

remain-

ing

units,

covers

and

screws.

ZA\WARNING:

NOT

forget

change

the

fuse

when

you

change

the

input

voltage.

incorrect

fuse

may

pose

fire

hazard.

AFGMB

fuse

for

100-120

versions

Ahigh

breaking

capacity

fuse

for

220-240

versions

QQ.

GV.

OPTIONAL

FILTER

INSTALLATION

After

installing

optional

filters,

the

transceiver

has

kinds

selectivity

for

2nd

and

3rd

filters

provide

better

S/N

(signal-to-noise

ratio),

reject

nearby

interference.

mode:

kinds

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.

med.,

nar.

FL-223

1.9

kHz/—6

FL-53A|

250

Hz/—6

FL-222

1.9

kHz/—6

When

only

filter

installed

for

selectivity,

such

FL-101

installed

but

FL-53A

installed,

optimum

performance

cannot

obtained

for

the

selectivity

and

the

twin

PBT

function

does

not

operate

correctly.

Both

filters,

such

FL-101

and

FL-53A,

should

installed.

FILTER

SELECTION

After

the

filter(s)

are

installed,

activate

the

op-

ional

filter(s)

H-set

mode.

(p.

47)

this

not

correctly

set,

the

installed

filter(s)

cannot

selected.

Remove

the

top

and

bottom

covers

described

the

first

page.

Insert

the

filter(s)

the

proper

position.

The

locations

are

shown

the

figures

below.

The

FL-53A

and

FL-222

must

installed

the

proper

direction.

The

FL-101,

FL-102

FL-223

work

regardless

the

direction

they

are

installed

in.

Replace

the

top

and

bottom

covers.

FL-102

(or

FL-101,

FL-223)

installation

Space

for

FL-101

—

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

selected

mode

clear,

electronically-generated

voice

(in

English

Japanese).

Remove

the

top

cover

described

the

first

page.

(2)

Plug

the

UT-66

into

the

MAIN

unit

(back-

side

the

S/RF

meter)

shown

the

figure

right.

Replace

the

top

cover.

Set

the

language

and

speech

speed

H-set

mode.

(p.

44)

CR-282

HIGH-STABILITY

CRYSTAL

UNIT

INSTALLATION

replacing

the

original

crystal

unit

with

this

unit,

the

total

frequency

stability

the

trans-

ceiver

will

improved.

CR-282

frequency

stability:

0.5

ppm

(—30°C

+60

°C;

—22°F

+140°F)

Ribbon

cable

Remove

the

top

and

bottom

covers

described

the

first

page.

(2)

Remove

screws

from

the

PLL

unit

and

the

ribbon

cable

from

J11;

then

turn

over

the

PLL

unit

see

the

reverse

side.

(Fig.

Unsolder

the

leads

the

installed

crystal,

then

remove

the

crystal.

Use

desoldering

braid.

(4)

Unsolder

the

positions

the

PLL

unit

where

the

CR-282

will

installed.

©)

Install

the

CR-282

the

PLL

unit,

paying

attention

orientation.

Symbols

the

bottom

the

CR-282

must

identically

matched

with

symbols

the

P.C.

board.

Bend

the

leads

the

CR-282

the

foil

side

the

P.C.

board

and

solder

them

shown

figure

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

necessary

with

the

PLL

unit.

-Ask

your

Icom

Dealer

Icom

Service

Center

for

details.

NOTE:

The

CR-282

oven-heat-type

crystal

unit,

and

the

specified

frequency

stabil-

ity

described

above

guaranteed

min.

after

power

ON.

FUSE

REPLACEMENT

ZAWARNING:

DISCONNECT

the

power

cable

and

wait

few

minutes

before

GZ,

opening

the

top

and

bottom

covers.

The

transceiver

has

external

line

fuse

inde-

pendent

the

line

fuse.

This

fuse

installed

under

the

bottom

cover.

the

fuse

blows,

try

find

the

source

the

problem,

and

replace

the

damaged

fuse

with a

new,

rated

fuse.

()

Remove

the

top

and

bottom

covers

described

the

first

page.

Replace

the

damaged

fuse

with

new,

rated

fuse

shown

right.

Replace

the

top

and

bottom

covers.

FGB

fuse

for

100

—

120

versions

high

breaking

capacity

fuse

for

220

—

240

versions

BACKUP

BATTERY

REPLACEMENT

The

transceiver

has

lithium

backup

battery

the

inside

the

front

panel

(MAIN

unit)

for

retaining

operating

conditions.

The

usual

life

the

backup

battery

approximately

years.

When

the

backup

battery

exhausted,

the

trans-

ceiver

transmits

and

receives

normally

but

cannot

retain

operating

conditions

except

for

memory

chan-

nels.

CAUTION:

the

lithium

battery

incorrectly

replaced,

could

explode.

Replace

with

CR-2032

equivalent

type.

(

Remove

the

top

and

bottom

covers

described

the

first

page.

(2)

Remove

screws

from

the

front

panel

shown

figure

right.

Remove

the

front

panel.

Replace

the

backup

battery

shown

figure

right.

(6)

Reassemble

the

front

panel.

Check

that

the

[POWER]

switch

works

smoothly.

Replace

the

top

and

bottom

covers.

CAUTION:

After

replacing

the

lithiurn

battery,

turn

power

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

visible

after

installation.)

Count

us!

A-5340S-2EX

Printed

Japan

1995

Icom

Inc.

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