Bernina Record 930 Electronic User manual

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Service Guide

Model 930

Sewconsult.com 2002

Div. Sewing Educational Warehouse

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Table of Contents

Parts of your machine Page 1

Removing covers page 2 – 4

Cleaning and lubrication page 5 – 6

Adjusting bobbin tension page 7

Adjusting top tension page8

Hook timing page 9 – 10

930 service tips page 11 – 55

Troubleshooting guide page 56 – 60

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1

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2

Tuning up your machine

There are three main points to a tune-up on a sewing machine.

-Cleaning and oiling

-Hook and feed timing

-Internal tension adjustment

Start by removing the covers on your machine.

DO NOT START ANY REPAIRS WITH OUT UNPLUGGING THE

MACHINE FROM THE WALL OUTLET

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4

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5

Cleaning and lubrication

The best way to remove lint from the machine is with

compressed air. Blow all the lint from the machine. Remove all

lint from the gears and again from the bobbin area and feed

dogs.

When oiling your machine, make sure you use a good quality

oiler and clear sewing machine oil.

This type of oiler is good because it has an extendable

spout and only lets out small drops of oil. A drop of oil is the

amount of oil left on the tip of a needle if you dipped it in oil.

Once the covers are removed use compressed air to clean the

machine. Check for thread and lint in the needle bar area. Also

pay close attention to the hook area. Care of the hook area is

covered on the next page. Check the hook for burrs. Polish any

with fine sand paper. Be careful as the hook must be smooth on

all surfaces.

Oil all moving parts in the machine making sure to remove all

excess oil with a soft cloth.

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6

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7

Adjusting Tensions

To check the bobbin tension, insert a bobbin wound

with medium weight thread into the bobbin case. Remove the

hook from the machine. Snap the bobbin case onto the hook.

Hold the hook and bobbin case by the bobbin thread and jerk

the thread once or twice. The bobbin and hook should move

down a bit. If the hook does not stop moving down the tension is

too loose. If the hook does not move the tension is too tight.

If the tension is too tight, turn the screw counterclockwise ¼

turn at a time and retest. If the tension is too loose, turn the

screw clockwise ¼ turn at a time and retest.

Continue to loosen or tighten the tension screw until the hook

only moves down about ½” when you jerk the thread.

It is rare that you have to adjust your bobbin tension. Mainly if

the tension spring was bent or for specialty sewing.

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