Bernina 700 Guida all'installazione

BERNINAAdvanced Technical Training

For the use of authorized BERNINA dealers only Last Revised 5/11/2005

2003 Bernina of America Inc

Service Procedure 700/800/900 Series

BERNINASafety Instructions

For the use of authorized BERNINA dealers only Last Revised 5/11/2005

Safety Regulation/Warning 2003 Bernina of America Inc

SAFETY REGULATION – WARNING

Please refer to the Safety Regulation information for each machine in the Bernina Factory Service Manual and the Safety Regulation

information in the My Bernina Guide Book.

All electrical and electronic components operate at dangerous voltages. The mains plug must be withdrawn before making any

adjustments to the machine. Wait about 30 seconds after removing the plug (capacitor discharge).

If two pieces of insulating material (i.e. shoe sole and floor) rub together, there can be a buildup of static electricity. Should this static

charge be discharged through electronic components, they can be seriously damaged. One of the most effective ways of conducting

these charges away is by grounding. This can be accomplished by using the grounding mat and wrist strap provided by Bernina of

America, Inc.

This manual is not intended to be complete and to replace any original factory manuals. Its purpose is solely to educate Bernina

dealers and their technician. For any additional factory settings, please refer to the corresponding factory service manual.

THIS MANUAL IS COPYRIGHTED AND REMAINS THE PROPERTY OF BERNINA OF AMERICA, INC.

PUBLICATION, DUPLICATION OR PROVIDING INFORMATION TO A THIRD PARTY WITHOUT OUR

WRITTEN APPROVAL FROM BERNINA OF AMERICA, INC. IS PROHIBITED.

BERNINA OF AMERICA, INC.

3702 PRAIRIE LAKE COURT

AURORA, IL 60504

BERNINAServicing Procedure for Series 700-900

For the use by Authorized BERNINA Dealers Only Last Revised 5/11/2005

Service Procedure 700-900.doc Page 1/32 2003 Bernina of America Inc

Part Description Possible

Malfunction

Repair

Instructions

Picture

Machine Check for overall physical

appearance,

damaged/scratched cover,

bent or broken spool pins,

button, knobs and levers.

Scratches in paint can

be polished or touched

up with touch-up

paint.

Broken parts are

replaced.

Machine Run machine if possible to

get a feel for the overall

conditions. Change stitch

length, stitch width, needle

position, select different

stitches and features, check

sewing light etc.

Note your findings and

proceed.

BERNINAServicing Procedure for Series 700-900

For the use by Authorized BERNINA Dealers Only Last Revised 5/11/2005

Service Procedure 700-900.doc Page 2/32 2003 Bernina of America Inc

Part Description Possible

Malfunction

Repair

Instructions

Picture

Service

Procedure

In order to follow a

systematic service procedure

we recommend to follow the

sequence outlined in this

manual

BERNINAServicing Procedure for Series 700-900

For the use by Authorized BERNINA Dealers Only Last Revised 5/11/2005

Service Procedure 700-900.doc Page 3/32 2003 Bernina of America Inc

Part Description Possible

Malfunction

Repair

Instructions

Picture

Clean and

lubricate the

entire machine

Foot control

and power

cord

Check foot control cover for

physical damage, check foot

control cord for damage

Check power cord and plug

for damage.

Consumer safety hazard.

Inconsistent speed

control

Machine hesitation

Replace foot control

covers and cord.

Replace power cord.

BERNINAServicing Procedure for Series 700-900

For the use by Authorized BERNINA Dealers Only Last Revised 5/11/2005

Service Procedure 700-900.doc Page 4/32 2003 Bernina of America Inc

Part Description Possible

Malfunction

Repair

Instructions

Picture

Accessories Check the condition of the

accessories such as presser

feet and bobbins.

Replace the individual

accessory

Free arm cover

plate

The cover plate should fit

tightly on top of the free arm

• Inconsistent

buttonholes.

• Inconsistent fabric

feed.

• Hollow sound

• Tape used as a fabric

guide too close to the

presser foot can

cause fabric feed

retardation.

With the cover

mounted and using the

knuckles of you finger,

tap all the way around

the edges of the cover.

If the cover does not

fit flush with the arm a

clanking sound can be

heard. Adjust the

cover by aligning it

with the top of the free

arm and the locking

mechanism.

Remove tape from free

arm cover and suggest

to the consumer to use

a presser foot with a

fabric guide instead.

BERNINAServicing Procedure for Series 700-900

For the use by Authorized BERNINA Dealers Only Last Revised 5/11/2005

Service Procedure 700-900.doc Page 5/32 2003 Bernina of America Inc

Part Description Possible

Malfunction

Repair

Instructions

Picture

Needle Plate The needle plate should be

smooth and polished,

especially around the stitch

hole.

• Thread breaking or

shredding

• Looping stitches

• Skipped stitches

• Fabric feeding issues.

• Difficulties sewing

lightweight and

elastic fabrics.

Polish or replace the

needle plate. When

polishing the plate be

careful not to enlarge

the stitch hole.

Feed Dog At stitch length maximum

the feed dog should not

touch the front or rear at its

full forward and reverse

stroke.

The feed dog must to be

parallel and in the center of

the needle plate

The teeth should be sharp

and complete.

Both rows of feed dog teeth

have to be the same height.

• Buttonhole feeding

problem

• Loud knocking sound

on longer stitch

length

• Feeding problems

Adjust or replace feed

dog.

INSTRUCTION IN

PART 2.2

Feed dog

support and

driving

mechanism

The feed dog, feed dog

support and feed dog driving

shaft should move bind and

play free.

• Buttonhole feeding

problem

• Knocking sound on

longer stitch length

• Feeding problems

Tighten the feed dog

support mechanism.

Remove the base plate

and eliminate the play

in the drive shaft by

tightening the collar

against the bushing.

BERNINAServicing Procedure for Series 700-900

For the use by Authorized BERNINA Dealers Only Last Revised 5/11/2005

Service Procedure 700-900.doc Page 6/32 2003 Bernina of America Inc

Part Description Possible

Malfunction

Repair

Instructions

Picture

Shuttle Race

Cover

Check for wear and tear

created by the hook and for

burrs created by the needle

and hook. The race cover

has to be smooth, and should

fit flush against the shuttle

race.

• Skipped stitches

• Looped stitches

• Thread breaking

• Hook noise

Adjust or replace

Hook The hook and hook tip

should be sharp, smooth and

polished.

Check hook for wear marks

at the running surface.

• Skipping stitches

• Looping stitches

• Thread breaking

• Thread jamming

• Thread fraying

• Hook noise

Sharpen and polish

hook point. Be careful

not to change the

shape of the hook tip.

If the hook is dropped

on the tip the tip might

be broken off or the tip

is bent, replace hook.

Bobbin Case

The bobbin case should be

smooth, polished and free of

corrosion.

There should be no lint

between the bobbin case and

the tension spring.

The tension spring creates

equal tension when the

thread released on the left

and right hand side of the

spring.

• Inconsistent tension • Adjust tension and

tension spring for

consistent and

equal tension.

• Polish the bobbin

case body

• Tighten the inside

and the spring

securing screw

(not the tension

adjusting screw)

BERNINAServicing Procedure for Series 700-900

For the use by Authorized BERNINA Dealers Only Last Revised 5/11/2005

Service Procedure 700-900.doc Page 7/32 2003 Bernina of America Inc

Part Description Possible

Malfunction

Repair

Instructions

Picture

Bobbin Case

(cont.)

• Adjust bobbin case

tension.

• Make sure a

genuine Bernina

bobbin case is

used.

Shuttle Race The race should be smooth,

clean and lubricated. Check

for scarring marks or

particles embedded into

recess and the running

surface.

• Loud hook noise

Using a toothpick or

an ear swab, remove

the particles from the

running surface and

the recess.

Replace if the race is

worn or the grooves

are too excessive.

BERNINAServicing Procedure for Series 700-900

For the use by Authorized BERNINA Dealers Only Last Revised 5/11/2005

Service Procedure 700-900.doc Page 8/32 2003 Bernina of America Inc

Part Description Possible

Malfunction

Repair

Instructions

Picture

Driver The driver pushes the hook

in an oscillating motion.

When the driver changes

directions the spring should

absorb the impact of the

hook’s momentum. The

driver is equipped with

needle guards/deflectors.

The driver should be free of

radial play.

• Skipped stitches

• Noise in hook area

• Looping stitches

• Thread breaking

• Thread fraying

Remove the driver;

clean the driver teeth,

behind the driver

spring, driver shaft,

bushing and rack.

Remove any burrs

from spring and driver

body.

Check driver spring

for:

Hair line creaks and

if spring has play on

both sides.

Before placing the

driver back in to the

machine lubricate the

driver shaft.

Also make sure to

maintain a 0.3mm

thread passing

clearance between the

hook and the driver

and no play exists

between rack and

driver. To eliminate

play carefully rotate

the rack counter

clockwise.

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