JVC AV-35750 User manual

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4

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AV-

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ME

SAFETY

PRECAUTIONS

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FEATURES:

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OPERATING

INSTRUCTIONS

[AV-35750]

(APPENDED)

..............2----00--

1-1~1-16

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OPERATING

INSTRUCTIONS

[AV-35770]

(APPENDED)

.............-----+--e-

{-1~

1-16

Mi

DIFFERENCE

LIST

OF

MAIN

PARTS...

2.26.2

ee

ee

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es

5

MB

SPECIFIC

SERVICE

INSTRUCTIONS

....

1.6...

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es

6

M

SERVICE

ADJUSTMENTS...

1...

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12

%

STANDARD

CIRCUIT

DIAGRAM

(APPENDED)

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COPYRIGHT

©

1996

VICTOR

COMPANY

OF

JAPAN,LTD.

Noon

at

Jul.1996

AV-35750

AV-35770

SPECIFICATIONS

ptm

TP

omtent

Dimensions

(W

XH

xD)

Mass

TV

System

and

Color

system

TV

RF

System

Color

System

Sound

System

TV

Receiving

Channels

and

Frequency

VL

Band

VH

Band

UHF

Band

CATV

Receiving

Channels

and

Frequency

(Quartz

Synthesizer

system)

Low

Band

High

Band

Mid

Band

Super

Band

Hyper

Band

ULTRA

Band

Sub

Mid

Band

TV/CATV

Total

Channel

Intermediate

Frequency

Video

IF

Carrier

Sound

IF

Carrier

Color

Sub

Carrier

Antenna

terminal

Power

Input

Power

Consumption

Input

Current

Picture

Tube

High

Voltage

Speaker

Audio

Power

Output

Input

(1,

2)

S-VIDEO

IN

Variable

/

Fix

Audio

Output

AV

Compulink

Input

Remote

Control

Unit

33-7/8"

X

30-1/8"

x

23-3/4”

/

86cm

x

76.5cm

x

60.3em

152.3lbs

/

69.2kg

CCIR

(M)

NTSC

BTSC

(Multi

Channel

Sound)

(02

~

06)

54MHz

~

88MHz

(07

~

13)

174MHz

~

216MHz

(14

~

69)

470MHz

~

806MHz

(02

~

06,

A-8)

by

(02

~

06801)

(07

~

13)

by

(07

~

13)

(A

~

1)

by

(14

~

22)

(J

~

W)

by

(23

~

36)

(W

+1

~

W+

28)

by

(37

~

64)

(W

+29

~

W

+84)

by

(65

~

125)

(A8,

A4

~

A1)

by

(01,

96

~

99)

180

Channels

(54MH2~

804MHz)

45.75MHz

41.25MHz

(4.5MHz)

3.58MHz

75Q

(VHF/UHF)

Terminal,

F-Type

Connector

120V

AC,

60Hz

135W(US)

1,.8A(CA)

35”(89cm)

measured

diagonally,

Full

Square

31kV

+1.3kV

(at

zero

beam

current

)

3-3/16”

x

4-3/4”

/

8X

12cm

Oval

Type

x2

3W

+3W

Video

:

1

Vp-p

75Q

(RCA

pin

jack)

Audio

:

500

mV

rms

(-4dBs),

High

impedance

(RCA

pin

jack)

Y

:

1

Vp-p

positive

(negative

sync

provided,when

terminated

with

752)

C

:

0.286

Vp-p

(

burst

signal,

when

terminated

with

75Q)

Variable:

More

than

0~

1550mV

rms

(

+

6dBs)

Low

Impedance

(400Hz

when

modulated

100%)

(RCA

pin

jack)

Fix

:

500

mV

rms

(-4dBs)

Low

Impedance

(400Hz

when

modulated

100%)

(RCA

pin

jack)

RECEIVER

/

AMP:

3.5mm

mini

jack

VCR

ONLY

:

3.5mm

mini

jack

RM-G742-1C

(AA/RG/UM-3

dry

baltery

x

2)

:

[AV-35750(US&CA)]

RM-C732-1A

(AAA/ROS/UM-4

dry

battery

x2)

:

[AV-35770(US)]

Design

&

specification

subject

to

change

without

notice.

2

(No.51130)

SAFETY

PRECAUTIONS

The

design

of

this

product

contains

special

hardware,

many

circuits

and

components

specially

for

safety

purposes.

For

continued

pro-

tection,zno

changes

should

be

made

to

the

original

design

unless

authorized

in

writing

by

the

manufacturer.

Replacement

parts

must

be

identical

to

those

used

in

the

original

circuits.

Service

should

be

performed

by

qualified

personnel

only.

Alterations

of

the

design

or

circuitry

of

the

products

should

not

be

made.

Any

design

alterations

or

additions

will

void

the

manufactur-

er's

warranty

and

will

further

relieve

the

manufacturer

of

responsi-

bility

for

personal

injury

or

property

damage

resulting

therefrom.

Many

electrical

and

mechanical

parts

in

the

products

have

special

safety-related

characteristics.

These

characteristics

are

often

not

evident

from

visual

inspection

nor

can

the

protection

afforded

by

them

necessarily

be

obtained

by

using

replacement

components

rated

for

higher

voltage,

wattage,

etc.

Replacement

parts

which

have

these

special

safety

characteristics

are

identified

in

the

parts

list

of

Service

manual.

Electrical

components

having

such

fea-

tures

are

identified

by

shading

on

the

schematics

and

by

(A)

on

the

parts

list

in

Service

manual.

The

use

of

a

substi-

tute

replacement

which

does

not

have

the

same

safety

characteris-

tics

as

the

recommended

replacement

part

shown

in

the

parts

list

of

Service

manual

may

cause

shock,

fire,

or

other

hazards.

Use

isolation

transformer

when

hot

chassis.

The

chassis

and

any

sub-chassis

contrained

in

some

products

are

connected

to

one

side

of

the

AC

power

fine.

An

isolation

transform-

er

of

adequate

capacity

should

be

inserted

between

the

product

and

the

AC

power

supply

point

while

performing

any

service

on

some

products

when

the

HOT

chassis

is

exposed.

Don't

short

between

the

LIVE

side

ground

and

ISOLAT-

ED(NEUTRAL)

side

ground

or

EARTH

side

ground

when

re-

pairing.

Some

model's

power

circuit

is

partly

different

in

the

GND.

The

dif-

ference

of

the

GND

is

shown

by

the

LIVE

:

(

)

side

GND,

the

ISOLATED(NEUTRAL)

:

(

ar)

side

GND

and

EARTH

:

(

)

side

GND.

Don't

short

between

the

LIVE

side

GND

and

!SOLAT-

ED(NEUTRAL)

side

GND

or

EARTH

side

GND

and

never

measure

with

a

measuring

apparatus

(oscilloscope

etc.)

the

LIVE

side

GND

and

ISOLATED(NEUTRAL)

side

GND

or

EARTH

side

GND

at

the

same

time.

If

above

note

will

not

be

kept,

a

fuse

or

any

parts

will

be

broken.

if

any

repair

has

been

made

to

the

chassis,

it

is

recommended

that

the

B,

setting

should

be

checked

or

adjusted

(See

ADJUSTMENT

OF

B,

POWER

SUPPLY).

The

high

voltage

applied

to

the

picture

tube

must

conform

with

that

specified

in

Service

manual.

Excessive

high

voltage

can

cause

an

increase

in

X-Ray

emission,

arcing

and

possible

component

dam-

age,

therefore

operation

under

excessive

high

voltage

conditions

should

be

kept

to

a

minimum,

or

should

be

prevented.

If

severe

ar-

cing

occurs,

remove

the

AC

power

immediately

and

determine

the

cause

by

visual

inspection

(incorrect

installation,

cracked

or

melted

high

voltage

harness,

poor

soldering,

etc.).

To

maintain

the

proper

minimum

level

of

soft

X-Ray

emission,

components

in

the

high

volt-

age

circuitry

including

the

picture

tube

must

be

the

exact

replace-

ments

or

alternatives

approved

by

the

manufacturer

of

the

com-

plete

product.

Do

not

check

high

voltage

by

drawing

an

arc.

Use

a

high

voltage

meter

or

a

high

voltage

probe

with

a

VTVM.

Discharge

the

picture

tube

before

attempting

meter

connection,

by

connecting

a

clip

lead

to

the

ground

frame

and

connecting

the

other

end

of

the

lead

through

a

10kQ

2W

resistor

to

the

anode

button.

When

service

is

required,

observe

the

original

lead

dress.

Extra

pre-

caution

should

be

given

to

assure

correct

lead

dress

in

the

high

voltage

circuit

area.

Where

a

short

circuit

has

occurred,

those

com-

ponents

that

indicate

evidence

of

overheating

should

be

replaced.

Always

use

the

manufacturer's

replacement

components.

10°

(1)

(2)

tsolation

Check

(Safety

for

Electrical

Shock

Hazard)

After

re-assembling

the

product,

always

perform

an

isolation

check

on

the

exposed

metal

parts

of

the

cabinet

(antenna

terminals,

vid-

eo/audio

input

and

output

terminals,

Control

knobs,metal

cabinet,

screwheads,

earphone

jack,

control

shafts,

etc.)

to

be

sure

the

prod-

uct

is

safe

to

operate

without

danger

of

electrical

shock.

Dielectric

Strength

Test

The

isolation

between

the

AC

primary

circuit

and

all

metal

parts

ex-

posed

to

the

user,

particularly

any

exposed

metal

part

having

a

re-

turn

path

to

the

chassis

should

withstand

a

voltage

of

1100V

AC

(r.m.s.)

for

a

period

of

one

second.

(....

Withstand

a

voltage

of

1100V

AC

(r.m.s.)

to

an

appliance

rat-

ed

up

to

120V,

and

3000V

AC

(r.m.s.)

to

an

appliance

rated

200V

or

more,

for

a

period

of

one

second.)

This

method

of

test

requires

a

test

equipment

not

generally

found

in

the

service

trade.

Leakage

Current

Check

Plug

the

AC

line

cord

directly

into

the

AC

outlet

(do

not

use

a

line

isolation

transformer

during

this

check.).

Using

a

"Leakage

Current

Tester”,

measure

the

leakage

current

from

each

exposed

metal

part

of

the

cabinet,

particularly

any

exposed

metal

part

having

a

return

path

to

the

chassis,

to

a

known

good

earth

ground

(water

pipe,

etc.).

Any

leakage

current

must

not

exceed

0.5mA

AC

(r.m.s.).

¢

Alternate

Check

Method

Piug

the

AC

line

cord

directly

into

the

AC

outlet

(do

not

use

a

line

isolation

transformer

during

this

check.).

Use

an

AC

voltmeter

hav-

ing

1000

ohms

per

volt

or

more

sensitivity

in

the

following

manner.

Connect

a

1500Q

10W

resistor

paralleled

by

a

0.15pF

AC-type

ca-

pacitor

between

an

exposed

metal

part

and

a

known

good

earth

ground

(water

pipe,

etc.).

Measure

the

AC

voltage

across

the

resis-

tor

with

the

AC

voltmeter.

Move

the

resistor

connection

to

each

ex-

posed

metal

part,

particularly

any

exposed

metal

part

having

a

re-

turn

path

to

the

chassis,

and

measure

the

AC

voltage

across

the

re-

sistor.

Now,

reverse

the

plug

in

the

AC

outlet

and

repeat

each

mea-

surement.

Any

voltage

measured

must

not

exceed

0.35V

AC

{r.m.s.).

This

corresponds

to

0.56mA

AC

(r.m.s.).

AC

VOLTMETER

(HAVING

1000Q/V,

OR

MORE

SENSITIVITY)

0.15pF

AC-TYPE

PLACE

THIS

PROBE

ON

EACH

EXPOSED

METAL

PART

15002

10W

GOOD

EARTH

GROUND

High

voltage

hold

down

circuit

check.

After

repair

of

the

high

voltage

hold

down

circuit,

this

circuit

shall

be

checked

to

operate

correctly.

See

item

"How

to

check

the

high

voltage

hold

down

circuit”.

This

mark

shows

a

fast

operating

fuse,

the

letters

indicated

below

show

the

rating.

(No.51

130)

3

AV-35750

AV-35770

AV-35750

AV-35770

FEATURES

®

New

chassis

design

enables

use

of

a

main

board

with

simplified

circuitry.

®

Comb

filter

improved

picture

quality.

®

Provided

with

miniature

tuner

(TV

/

CATV)

®

Full-square

CRT

(cathode

ray

tube)

reproduces

fine

textured

picture

in

every

detail.

®@

PLL

synthesizer

system

TV

/

CATV

totaling

180

channels.

@®

AV

COMPU

LINK

terminals

allow

simultaneous

mode

switching

of

the

TV,

connected

receiver

(or

amplifier)

and/or

VCR.

4

(No.51130)

Closed-caption

broadcasts

can

be

viewed.

With

AUDIO.

VIDEO

INPUT

terminal.

S-VIDEO

input

terminal

for

taking

best

advantage

of

Super

VHS.

Variable

audio

output

terminal.

Built-in

PIP

system.

An

auto

demonstration

function

demonstrates

the

features

of

this

model.

\2C

bus

control

utilizes

single

chip

ICs.

DIFFERENCE

LIST

OF

MAIN

PARTS

rea

|

ero

AV-35750(US)

AV-35750(CA)

AV-35770(US)

Part

name

inne

|

serene

[YC

earsoowrovensey

|

sorsovnae

[=

(|

emma

remwse

|somenne

[|

terme

pfeenmeswes

[amen

[|

ve

a

sreoorecuny

|

cowaeara

[=|

commen

rfnsrsocencn

[=|

eo

[

resicw

|

eran“

Ea

[>

>

elel

| |

|

ele]

(No.84130)

5

AV-35750

AV-35770

SPECIFIC

SERVICE

INSTRUCTIONS

REPLACEMENT

OF

CHIP

COMPONENT

MCAUTIONS

1.

Avoid

heating

for

more

than

3

seconds.

2.

Do

not

rub

the

electrodes

and

the

resist

parts

of

the

pattern.

3.

When

removing

a

chip

part,

melt

the

solder

adequately.

4.

Do

not

reuse

a

chip

part

after

removing

it.

MSOLDERING

IRON

1.

Use

a

high

insulation

soldering

iron

with

a

thin

pointed

end

of

it.

2.

A

30w

soldering

iron

is

recommended

for

easily

removing

paris.

MREPLACEMENT

STEPS

1.

How

to

remove

Chip

parts

Resistors,

capacitors,

etc

(1)

As

shown

in

the

figure,

push

TWEEZERS

(2)

Shift

with

tweezers

and

remove

the

part

with

tweezers

and

the

chip

part.

TWEEZERS

alternately

melt

the

solder

at

Q

each

end.

By

eTransistors,

diodes,

variable

resistors,

etc

(1)

Apply

extra

solder

to

each

q

(2)

As

shown

in

the

figure,

push

the

lead.

part

with

tweezers

and

alternately

melt

the

solder

at

each

lead.

Shift

and

remove

the

chip

part.

TWEEZERS

SOLDER

Note:

After

removing

the

part,

remove

remaining

solder

from

the

pattern.

2.

How

to

install

Chip

parts

@Resistors,

capacitors,

etc

(1)

Apply

solider

to

the

pattern

(2)

Grasp

the

chip

part

with

as

indicated

in

the

figure.

tweezers

and

place

it

on

the

TWEEZER

solder.

Then

heat

and

melt

the

solder

at

both

ends

of

the

chip

part.

Transistors,

diodes,

variable

resistors,

etc

.

(1)

Apply

solder

to

the

(2)

Grasp

the

chip

part

with

(3)

First

solder

lead

A

as

(4)

Then

solder

leads

B

and

C.

pattern

as

indicated

in

the

tweezers

and

place

it

on

indicated

in

the

figure.

figure.

the

solder.

(A)

(B)

(C)

6

(No.51130)

DISASSEMBLY

PROCEDURE

REMOVING

THE

REAR

COVER

1.

Unplug

the

power

supply

cord.

2.

Remove

the

11

screws

marked

@)

as

shown

in

Fig.

2.

*

When

reinstalling

the

rear

cover,

carefully

push

it

inward

after

inserting

the

chassis

into

the

rear

cover

groove.

REMOVING

THE

CHASSIS

e@

After

removing

the

rear

cover.

1.

Slightly

raise

the

both

sides

of

the

chassis

by

hand

and

remove

the

two

claws

under

the

both

sides

of

the

chassis

from

the

front

cabinet.

2.

Draw

the

chassis

backward

along

the

rail

in

the

arrow

direction

marked

as

shown

in

the

Fig.

2.

(I

necessary,

take

off

the

wire

clamp,

connectors

etc.)

@

When

conducting

a

check

with

power

supplied,

be

sure

to

confirm

that

the

CRT

earth

wire

is

connected

to

the

CRT

SOCKET

PWB

and

the

MAIN

PWB.

REMOVING

THE

FRONT

CONTROL

PW

BOARD

@

After

removing

the

rear

cover

and

chassis.

1.

Remove

the

2

screws

marked

©)

as

shown

in

Fig.

2.

2.

Remove

the

FRONT

CONTROL

PW

BOARD

toward

you.

REMOVING

THE

TERMINAL

BOARD

e

After

removing

the

rear

cover.

1.

Remove

the

4

screws

marked

©)

as

shown

in

Fig.

2.

2.

After

removing

the

claw

marked

©

from

the

AV

JACK

PWB

in

the

direction

of

arrow

mark

as

shown

in

Fig.1,

remove

the

2

claws

marked

©)

in

the

direction

of

arrow

mark,

then

take

off

the

TERMINAL

BOARD

in

the

direction

of

arrow

marked

©.

REMOVING

THE

ANT

SPLITTER

1.

Remove

a

screw

marked

(a)

as

shown

Fig.1.

CHECKING

THE

MAIN

PW

BOARD

1.

To

check

the

back

side

of

the

MAIN

PW

Board.

4)

Pull

out

the

chassis.

(Refer

to

REMOVING

THE

CHASSIS).

2)

Erect

the

chassis

vertically

so

that

you

can

easily

check

the

back

side

of

the

MAIN

PW

Board.

[CAUTION]

@

When

erecting

the

chassis,

be

careful

so

that

there

will

be

no

contacting

with

olher

PWB.

®

Before

turning

on

power,

make

sure

thal

the

wire

connector,

CRT

earth

wire

and

other

connectors

properly

connected.

AV-35750

AV-35770

WIRE

CLAMPING

AND

CABLE

TYING

1.

Be

sure

to

clamp

the

wire.

2.

Never

remove

the

cable

tie

used

for

tying

the

wires

together.

Should

it

be

inadvertently

removed,

be

sure

to

tie

the

wires

with

a

new

cable

tie.

AV

JACK

PWB

ANT

SPLITTER

MAIN

PWB

Fig.1

)

|

|

|

(No.5

1130)

7

AV-35750

AV-35770

FRONT

CABI.

CRT

SOCKET

PWB

MAIN

PWB

CHASSIS

BASE

FRONT

CONTROL

PWB

Fig.

2

8

(No.51130)

AV-35750

AV-35770

REMOVING

THE

CRT.

CRT

CHANGE

TABLE

*

Replacement

of

the

CRT

should

be

performed

by

two

or

more

persons.

@

After

removing

the

rear

cover,

chassis

etc..,

5

,

APPROX.

1.

Putting

the

CRT

change

table

on

soft

cloth,

the

CRT

change

table

should

also

be

covered

with

such

soft

cloth.

(shown

in

Fig.

3)

2.

While

keeping

the

surface

of

CRT

down,

mount

the

TV

set

on

the

CRT

change

table

balanced

will

as

shown

in

Fig.

4.

3.

Remove

four

screws

marked

by

arrows

with

a

box

type

screw

driver

as

shown

in

Fig.

4.

@

Since

the

cabinet

will

drop

when

screws

have

been

removed,

be

sure

to

support

the

cabinet

with

hands.

4.

After

four

screws

have

been

removed,

put

the

cabinet

siowly

on

cloth

(At

this

time,

be

carefully

so as

not

to

damage

the

front

surface

of

the

cabinet)

shown

in

Fig.5.

@

The

CRT

should

be

assembled

according

to

the

opposite

sequence

of

its

dismounting

steps.

*

The

CRT

change

table

should

preferably

be

smaller

than

the

CRT

surface,

and

its

height

be

about

35cm.

vT

a

'

rr

carta

tan

BOX

TYPE

SCREW

DRIVER

COATING

OF

SILICON

GREASE

FOR

ELECTRICAL

INSULATION

ON

THE

CRT

ANODE

CAP

SECTION

®

Subsequent

to

replacement

of

the

CRT

and

HV

transformer

or

repair

of

the

anode

cap,

etc.

by

dismounting

them,

be

sure

to

coat

silicon

grease

for

electrical

insulation

as

shown

in

Fig.

6.

Wipe

around

the

anode

button

with

clean

and

dry

cloth.

(Fig.

6)

CABINET

Coat

silicon

grease

on

the

section

around

the

anode

button

.

At

this

time,

take

care

so

that

any

silicon

grease

does

not

stick

to

the

anode

button.

(Fig.

7)

*

Silicon

grease

product

No.:

KS

-

650N

Anode

button

Approx.

Silicon

grease

20mm(Do

not

|

should

be

coated

coat

greaseon

->

<-

by

5mm

or

more

this

section).

from

the

outside

:

diameter

of

|

anode

cap.

;

Anode

button

(No

sticking

of

silicon

grease)

Silicon

grease

coating

Coating

position

of

silicon

grease

Anode

cap

{

3

Fig.

6

Fig.

7

(No.5

1130)

9

AV-35750

|

AV-35770

MEMORY

IC

REPLACEMENT

1.

Memory

IC

This

model

uses

a

memory

(EEP-ROM)

IC.

The

memory

IC

stores

data

for

proper

operation

of

the

video

and

deflection

circuits.

When

replacing,

be

sure

to

use

an

IC

containing

this

(initial

value)

data.

2.

Memory

IC

replacement

procedure

Procedure

Power

off

Switch

off

the

power

and

disconnect

the

power

cord

from

the

outlet.

Replace

the

memory

IC.

Initial

value

must

be

entered

into

the

new

IC.

Power

on

Connect

the

power

cord

to

the

outlet

and

switch

on

the

power.

System

constant

check

and

setting

Simultaneously

press

the

DISPLAY

key

and

VIDEO

STATUS

key

of

the

remote

control

unit.

The

SERVICE

MENU

screen

of

Fig.

1

is

displayed.

While

the

SERVICE

MENU

is

displayed,

again

simultaneously

press

the

DISPLAY

and

VIDEO

STATUS

keys

to

display

the

Fig.

2

SYSTEM

CONSTANT

screen.

Refer

to

the

SYSTEM

CONSTANT

table

and

check

the

setting

items.

Where

these

differ,

select

the

setting

item

with

the

MENU

UP

/

DOWN

key

and

adjust

the

setting

with

the

MENU

LEFT

/

RIGHT

keys.(The

letters

of

the

selected

item

are

displayed

in

yellow.)

After

adjusting,

release

the

MENU

LEFT

/

RIGHT

key

to

store

the

setting

value.

Press

the

EXIT

key

twice

to

return

the

normal

screen.

Receive

channel

setting

Refer

to

the

OPERATING

INSTRUCTIONS(USER’S

GUIDE)

and

set

the

receive

channels

(Channels

Preset)

as

described.

User

settings

Check

the

user

setting

items

According

to

Table

2.

Where

these

do

not

agree,

refer

to

the

OPERATING

INSTRUCTIONS(USER’S

GUIDE)

and

set

the

items

as

described.

SERVICE

MENU

setting

Verify

what

to

set

in

the

SERVICE

MENU,

and

set

whatever

is

necessary.

(Fig.

1)

refer

to

the

SERVICE

ADJUSTMENT

for

setting.

10

(No.51130)

Screen

display

SERVICE

MENU

PICTURE

SOUND

THEATER

OTHERS

PIP

LOW

LIGHT

HIGH

LIGHT

RF

AFC

1

RF

AFC

2

12C

BUS

CTRL

SELECT

By[ally]

OPERATE

BY[4][>]

Exit

BY

@

SYSTEM

CONSTANT

MODEL

:

AV-35750:[AV-35750]

AV-35770:[AV-35770]

CCD:

YES

setect

sy[ally]

OPERATE

BY[4][>]

exit

By

@