Singer XL-420 User manual

Service Manual

Original issue

May 2014

Page 1／64

Model

XL-420

| 1

XL-420

First issue: May, 2014

Service Manual

Original issue

May 2014

Page 2／64

Model

XL-420

| 2

SEC.1 Disassembling covers

SEC.2 Test mode with warning function deactivated

SEC.3 Needle clearance to shuttle

SEC.4 Alignment of needle plate to shuttle

SEC.5 Presser foot height and direction

SEC.6 Origin point positioning of zigzag bight

SEC.7 Needle bar height

SEC.8 Needle threader height

SEC.9 Adjustment of feed dog height

SEC.10 Tension of timing belt

SEC.11 Needle timing to feed dog

SEC.12 Needle timing to shuttle hook

SEC.13 Adjustment of timing of take-up lever to shuttle

SEC.14 Adjustment of meshing position of gears for take-up lever

SEC.15 Retaining bracket for bobbin case

SEC.16 Origin point positioning of feed “zero”

SEC.17 Stitch length

SEC.18 Ajustment of upper thread tension

SEC.19 Adjustment of CAM sensor

SEC.20 Check the Knee Lifter

SEC.21 Sewing machine test mode

SEC.22 Removing top cover and carriage cover of embroidery unit

SEC.23 Adjustment of stop position of embroidery carriage

along X & Y axis

SEC.24 Embroidery unit test mode

SEC.25 Trouble contents with LED on panel

SEC.26 Wiring diagram part1 & part2

SEC.27 Main circuit board and functions of each connector

Contents

Service Manual

Original issue

May 2014

Page 3／64

Model

XL-420

| 3

Ａ．Disassembling face cover

Ｂ．Disassembling bed cover

1. Pull out cap (not shown) in the center

and remove screw.

2. Loosen the screw behind.

3. Remove face cover

1. Pull out cap at bed cover using needle.

SEC.1-1 Disassemblin

covers

(

)

Service Manual

Original issue

May 2014

Page 4／64

Model

XL-420

| 4

Ｃ．Disassembling bobbin winder unit.

2. Loosen M4 screw.

3. Slide out bed cover.

1. Remove M3 screw at bobbin winding

latch.

2. Remove bobbin winding latch.

SEC.1-2 Disassembling covers (2)

Service Manual

Original issue

May 2014

Page 5／64

Model

XL-420

| 5

Ｄ．Removing switch cover

3. Remove M4 screw at bobbin winder

cover.

4. Remove two hooks at the side of the cover

from rear cover.

１．Removing M4 screws at the side of the cover.

SEC.1-3 Disassembling covers (3)

Service Manual

Original issue

May 2014

Page 6／64

Model

XL-420

| 6

Ｅ．Removing base cover

２．Remove switch cover.

１．Remove three M4 screws behind the sewing machine.

２．Lay the machine and remove two M3 tapping screws.

SEC.1-4 Disassembling covers (4)

Service Manual

Original issue

May 2014

Page 7／64

Model

XL-420

| 7

Ｆ．Remove front and rear covers.

３．Remove two M4 screws on the right.

４．Remove two M4 screws on the center.

1. Remove two M4 tapping screws near the handle at the top of rear

cover.

SEC.1-5 Disassembling covers (5)

Service Manual

Original issue

May 2014

Page 8／64

Model

XL-420

| 8

４． Lay the machine and open a rid behind the front cover by using a

small screw driver.

3. Remove M3 screw and washer at the front cover.

You can only loosen a screw but if you do so, be careful of a

position of washer when re-assembling.

2. Remove M4 screw at rear cover.

SEC.1-6 Disassembling covers (6)

Service Manual

Original issue

May 2014

Page 9／64

Model

XL-420

| 9

5. Insert small screw driver into clearance

between front and rear covers and then lift up the

front cover to remove two covers as shown at left.

* Once hooked portions A, B and C as shown

above are removed, other mating portions may be

removed easily.

ＡＢ

Ｃ

6. Lay the machine on its back for easier removal

of covers. Remove front cover. Remove CPU

board and FFC-28 from front cover with care.

*FFC is flexible flat cable

SEC.1-7 Disassembling covers (7)

Ｂ

Ｃ

Service Manual

Original issue

May 2014

Page 10／64

Model

XL-420

| 10

7. Lower the presser foot lever and

then remove rear cover by lifting up

and passing it under the presser foot

taking care not to interfere with each

other.

This is a view of machine without front

cover.

This is a view of machine without

rear cover.

SEC.1-8 Disassemblin

covers

(

)

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