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
g
covers
(
1
)

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.
Ａ Ｂ
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
g
covers
(
8
)