Brother International MD-817 Service Manual - Page 42

(

SPEED

ADJUSTMENT

FOR

EACH

MACHINE

Selection

of

motor

pulley

and

method

of

replacement

1)

Selection

of

motor

pulley

Select

the

correct

motor

pulley

for

the

machine

according

to

the

separate

list.

(Remark):

The

figures

described

for

motor

pulley

are

outer

diameters

of

V

groove.

2)

Replacement

of

pulley

a)

Take

off

pulley

cover.

b)

Remove

V

belt.

c)

Unfasten

pulley

set

screw,

M5

x

12

screw

(3

pcs.)

and

then

exchange

the

pulley.

d)

Reassemble

them

in

the

reverse

procedure.

(Remark):

In

the

case

the

pulley

is

exchanged,

the

high

backtacking

and

low

speeds

will

all

change.

Fl

Adjustment

of

each

speed

1)

Adjustment

of

high

speed

a)

Set

up

the

machine

and

motor.

b)

Turn

the

high

sewing

speed

dial

in

front

of

the

control

box

fully

clockwise.

c)

Remove

the

rubber

plug

from

the

rear

of

the

control

box

and

turn

the

inside

dial

0.

When

it

is

turned

to

the

right,

the

machine

speeds

up.

(Remark):

Turn

VR

first

to

the

left

and

then

make

speed

adjustment

from

a

lower

speed,

thereby

Inside

dial

0

avoiding

troubles

due

to

abnormal

speed.

d)

Turn

the

power

switch

on

and

keep

the

treadle

fully

down

when

adjusting

the

speed.

2)

Adjustment

of

end

backtacking

speed

a)

Open

the

cover

of

the

control

box.

b)

Turn

the

power

switch

on.

c)

Set

operation

panel

and

turn

only

end

backtacking

switch

on

(even

in

the

case

of

E0,

make

necessary

ad-

justment

using

E20,

E40

or

E100

operation

panel).

d)

Depress

the

treadle

forward

to

put

the

machine

back

in

neutral

before

stopping

the

machine

with

the

needle

in

the

down

position.

e)

Remove

the

synchronizer

plug

from

the

control

box.

f)

Depress

the

treadle

backward

and

the

machine

will

keep

running

at

the

backtacking

speed;

make

adjustment

using

VR

EBT.

3)

Adjustment

of

thread

trimming

speed

a)

Open

the

cover

of

the

control

box.

b)

Depress

the

treadle

forward

lightly

to

put

the

machine

back

in

neutral

before

stopping

the

machine

will

the

needle

in

the

down

position.

c)

Remove

the

synchronizer

plug

from

the

control

box

and

depress

the

treadle

forward

to

put

the

machine

back

in

neu-

tral

and

the

machine

will

keep

running

at

low

speed;

make

adjustment

using

VR

TRIM

(LOW).

d)

After

adjustment,

turn

the

power

switch

off,

close

the

cover,

then

reinsert

synchronizer

plug.

In

the

case

the

torque

is

insufficient

for

some

specific

sewing,

use

the

next

smaller

pulley

to

increase

the

torque

but

make

sure

to

select

such

pulleys

that

speed

of

DC

servomotor

will

not

be

required

to

rotate

at

more

than

3,000RPM

for

the

maximum

sewing

speed

of

machine.

Machine

pulley

speed

must

be

calculated

based

on

an

effective

diameter

of

approx.

70mm.

*Refer

to

E

Control

box

in

ADJUSTMENT.

-

38

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Brother International MD-817 Service Manual - Page 42

Speed, Adjustment, Machine

Page 42 highlights