Brother International DB2-B737 Network Users Manual - English - Page 11

131

Control

box

Control

Box

(Model

DB2-B737)

The

high

speed

volume,

backtack

stitch

volume,

power

lamp,

needle

position

switch,

one-stitich

modification

switch,

slow

start

switch

and

connector

for

synchronizer

and

connector

for

control

box

are

arranged

on

the

front

of

the

control

box.

All

these

parts

are

already

provided

on

the

control

circuit

board.

The

control

circuit

board

is

installed

on

the

inside

of

the

control

box.

The

power

circuit

board

is

at

the

back

and

the

treadle

unit

is

on

the

left

side

wall.

The

right

side

wall

is

furnished

with

one

15A

fuse

for

the

110-240V

single-phase

type,

two

5A

fuses

for

the

200-

240V

three-phase

type

and

two

3A

fuses

for

380-440V

three-phase

type.

The

control

circuit

board

is

provided

with

the

8A

fuse

for

solenoid

load.

*Do

not

fail

to

secure

the

fuse

holder

cap

after

replacing

or

inspecting

the

fuses.

*Never

short-circuit

the

lamp

terminal

(AC

6V

terminal)

for

lighting,

or

the

transformer

may

be

broken.

Control

circuit

board

Explanation

of

Each

Volume

Knob

*Do

not

turn

the

volume

knobs

when

not

necessary.

Model

B737

•

B747

•

B748

•

B791

•

B793

•

B795

•

B798

O

[

-

inn

r

lu

0

VR3

VR2

VR1O

E

nn

11

L_I

LJ

(1)

mimiml

°

TvRal

I

LCVR

SVR

1=1

I

-

BEI

vR

50

L

0

0

O

0 0

0

Model

B738

0

a)

0

0

==

0

0

TVR

SVR

CVR

0

VR3

VR2

(Backtacking)

UVR1

(Low

speed)

1.

Take

off

the

front

cover.

2.

When

the

VR1

0

(low

speed

and

thread

trimming)

is

turned

clockwise,

the

low

machine

speed

is

adjusted

to

increase.

3.

When

the

VR2

0

(backtacking

speed)

is

turned

clockwise,

the

backtacking

speed

is

adjusted

to

increase.

4.

When

the

VR5

0

(brake

-off

time

setting)

is

turned

clockwise,

the

brake

force

is

adjusted

to

increase.

And

when

counterclockwise,

it

is

ad-

justed

to

decrease.

5.

When

the

TVR

0

(torque

setting)

is

turned

clock-

wise,

the

torque

is

adjusted

to

increase.

CAUTION:

Other

volume

knobs

are

factory

set,

so

that

they

never

require

adjustment

anymore.

1.

Take

off

the

front

cover.

2.

When

the

VR1

0

(low

speed

and

thread

trimming)

is

turned

clockwise,

the

low

machine

speed

is

adjusted

to

increase.

3.

The

VR2

0

(backtacking

speed)

is

preset

at

1800

spm,

so

it

never

requires

adjustment

any-

more.

(Do

not

touch

the

VR2,

or

the

stop

position

varies.)

4.

The

VR3

0

(automatic

speed)

is

changed

by

the

maximum

sewing

speed

volume

knob,

so

the

VR3

requires

no

adjustment.

5.

When

the

TVR

(torque

setting)

is

turned

clock-

wise,

the

torque

is

adjusted

to

increase.

6.

When

the

VR1

0

(brake

-off

time

setting)

is

turned

clockwise,

the

brake

force

is

adjusted

to

increase.

And

when

counterclockwise,

it

is

ad-

justed

to

decrease.

CAUTION:

Other

volume

knobs

are

factory

set,

so

that

they

never

require

adjustment

anymore.

NOTE

1:

It

is

dangerous

to

touch

the

volume

knobs

by

finger

because

high

voltage

is

applied.

Do

not

fail

to

turn

off

the

power

switch

before

adjustment.

To

check

the

setting,

turn

it

on

again.

NOTE

2:

Take

care

that

the

driver

does

not

touch

other

parts

but

the

volume

knobs

for

adjustment.

Adjust

the

volume

knobs

with

great

care.

They

may

be

broken

if

turned

over

the

stopper.

NOTE

3:

When

any

volume

knob

is

turned

by

mistake,

turn

it

back

so

that

the

red

paint

marks

match

with

each

other.

Brother International DB2-B737 Network Users Manual - English - Page 11

short-circuit

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