Icom IC-775 Manuale operativo

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2

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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.