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Singer
Electronic Sewing Machine

Model # 9940 Official Singer sewing machine

Here are the diagrams and repair parts for Official Singer 9940 sewing machine, as well as links to manuals and error code tables, if available.

There are a couple of ways to find the part or diagram you need:

  • Click a diagram to see the parts shown on that diagram.
  • In the search box below, enter all or part of the part number or the part’s name.

Not all parts are shown on the diagrams—those parts are labeled NI, for “not illustrated”.

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For DIY troubleshooting advice and repair guides, visit our repair help section.

Owner’s manual
Error Codes

Model diagram and schematic

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ALL PARTS
Showing 10 of 355 parts  |
Presser Foot HP30217-2
#16

Accessory set diagram

Presser foot

Part #HP30217-2

The manufacturer no longer makes this part, and there's no substitute part

Sewing Machine Extension Table HP33012
#22

Front enclosure/front panel diagram

Sewing machine extension table

Part #HP33012

The manufacturer no longer makes this part, and there's no substitute part

Singer Feed Foot HP31099-3
#18

Accessory set diagram

Singer feed foot

Part #HP31099-3

The manufacturer no longer makes this part, and there's no substitute part

Enclosure HP33006
#1

Front enclosure/front panel diagram

Enclosure

Part #HP33006

The manufacturer no longer makes this part, and there's no substitute part

Foot Button HP32948
#7

Accessory set diagram

Foot button

Part #HP32948

The manufacturer no longer makes this part, and there's no substitute part

Sewing Machine Vacuum Power Switch HP33128
#2

Power circuit diagram

Sewing machine vacuum power switch

Part #HP33128

The manufacturer no longer makes this part, and there's no substitute part

Zigzag Foot HP32969
#56

Needle bar guide/z link bracket diagram

Zigzag foot

Part #HP32969

The manufacturer no longer makes this part, and there's no substitute part

Cover Plate HP32845
#17

Needle plate/hook race diagram

Cover plate

Part #HP32845

The manufacturer no longer makes this part, and there's no substitute part

Sewing Machine Needle Plate HP32843
#0

Needle plate/hook race diagram

Sewing machine needle plate

Part #HP32843

The manufacturer no longer makes this part, and there's no substitute part

Terminal Box HP33083
#9A

Base/head/face plate diagram

Terminal box

Part #HP33083

The manufacturer no longer makes this part, and there's no substitute part

Most common symptoms to help you fix your sewing machines

Choose a symptom to see related sewing machine repairs.

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Why won't my sewing machine turn on?

Main causes: power supply failure, bad power cord, faulty On/Off switch…

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Why is my sewing machine running sluggishly?

Main causes: lack of lubrication, lint buildup, worn drive belt, faulty drive motor…

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Why won't fabric move through my sewing machine?

Main causes: problems with the feed dogs, setting stitch length to 0…

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Why does the bobbin thread break in my sewing machine?

Main causes: dirty shuttle race, improper thread routing, incorrect thread tension…

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Why won't my sewing machine needle move?

Main causes: disengaged clutch, broken drive belt, internal drive gear failure…

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Why doesn't my sewing machine motor run?

Main causes: faulty foot pedal, locked drive gears, wiring failure, bad drive motor…

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Why is my sewing machine skipping stitches?

Main causes: dirty shuttle race, wrong thread tension, bad needle timing, damaged needle, using the wrong type of needle…

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Why does my sewing machine lock up?

Main causes: thread bunched up in the shuttle race, bad needle timing, internal drive gear failures…

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Why does my sewing machine make a knocking sound?

Main causes: machine needs lubrication, internal gear failure…

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Most common repair guides to help fix your sewing machines

These step-by-step repair guides will help you safely fix what’s broken on your sewing machine.

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How to replace a sewing machine drive motor

How to replace a sewing machine drive motor

If the drive motor on your sewing machine runs roughly or doesn't run at all, you can replace it in about 30 minutes usi…

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Repair difficulty
Time required
 15 minutes or less
How to replace a sewing machine drive belt

How to replace a sewing machine drive belt

You can replace a broken sewing machine drive belt in about 15 minutes. …

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Repair difficulty
Time required
 15 minutes or less
How to replace a sewing machine on/off switch

How to replace a sewing machine on/off switch

If the sewing machine is completely dead, replace the On/Off switch using these 6 steps.…

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Repair difficulty
Time required
 30 minutes or less

Effective articles & videos to help repair your sewing machines

Use the advice and tips in these articles and videos to get the most out of your sewing machine.

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How to enjoy all the online benefits we offer on our Sears PartsDirect website

How to enjoy all the online benefits we offer on our Sears PartsDirect website

Learn about all the convenient features on our Sears PartsDirect website that make your parts purchases easier.…

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Top questions about Sears and Sears PartsDirect

Top questions about Sears and Sears PartsDirect

Get answers to frequently asked questions about Sears and Sears PartsDirect.…

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How to use a multimeter to test electrical parts video

How to use a multimeter to test electrical parts video

Learn how to use a multimeter to check for wiring problems in an appliance that's not working…

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