JEWEL Baby Lock User manual

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ServiceManual
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Baby Lock Jewel Service Manual
© Baby Lock, all rights reserved
2
Table of Contents
About the Baby Lock Jewel Quilting Machine...................................................................... 4
About the Manual ................................................................................................................... 4
Service Manual General Rule................................................................................................. 4
General Specifications.............................................................................................................. 5
Assembly Torque Specification ............................................................................................... 5
Lubrication of the Hook........................................................................................................... 6
General Observation of the Front Frame Cover, Mast and Hand Wheel........................... 6
Replacement of cover ............................................................................................................. 8
Removal of the Front Cover ................................................................................................... 9
Machine Cross Section ........................................................................................................... 11
Axial Play Check and Adjustment ........................................................................................ 14
Adjusting the Base Plate Feet and Rollers............................................................................ 15
Adjustment of Base Plate Rollers:........................................................................................ 15
Adjusting the motor belt Tension.......................................................................................... 16
Adjusting Transmission Gear Lash (play) ........................................................................... 17
Adjusting the Timing Belt Tension ....................................................................................... 18
Adjusting the Presser Foot (Sewing Foot)............................................................................ 19
Needle Position, Check, & Adjustment................................................................................. 20
Adjustment for Y axis:.......................................................................................................... 20
Adjustment for X axis:.......................................................................................................... 20
Adjustment of the Loop Lift and Needle Distance............................................................... 21
Adjusting the Needle Bar Height........................................................................................... 23
Adjustment of the Stop Finger............................................................................................... 24
Adjusting the Needle Height with Cylinder Tool................................................................. 25
Needle Height with Cylinder Tool........................................................................................ 25
Baby Lock Jewel Trouble Shooting Guide........................................................................... 27
Loop Lift............................................................................................................................... 27
Needle Hook Reference........................................................................................................ 28
Loop Lift, Hook, Tension Illustration................................................................................... 29
Bobbin Case Tension Adjustment ........................................................................................ 30
Understanding Top Tension.................................................................................................. 31
Some things to check - Visual checks of the top tension assembly:................................. 31
Thread Shredding & Breaking Issues................................................................................... 32
Skipped Stitches.................................................................................................................... 33
Proper Stitch formation:.................................................................................................... 33
Four major causes of skipped stitches: ............................................................................. 33
More Causes of Skipped Stitches: .................................................................................... 33
Four things required for proper machine timing setting:.................................................. 34
Stitch length in Manual & Stitch Regulation Mode.............................................................. 34
Manual Mode - user selects motor speed.......................................................................... 34
Stitch Regulation Mode - user selects Stitch Length = # of stitches per inch .................. 34
Stitch Regulator ...................................................................................................................... 36
Stitch Regulator Basic Theory:............................................................................................. 36
The Regulator will do the desired stitches per inch if: ..................................................... 36

Baby Lock Jewel Service Manual
© Baby Lock, all rights reserved
3
Possible Misunderstandings:............................................................................................. 36
Setup and Mechanical Problems:...................................................................................... 36
Operation Problems: ......................................................................................................... 37
Stitch Regulator – Methodical Check................................................................................... 38
Stitch Regulator Trouble shooting:....................................................................................... 39
Setup Errors: ..................................................................................................................... 39
Operation Errors: .............................................................................................................. 39
Mechanical Problems:....................................................................................................... 39
Electronic Problems: .............................................................................................................. 39
LCD Screen Operation........................................................................................................... 40

Baby Lock Jewel Service Manual
© Baby Lock, all rights reserved
4
About the Baby Lock Jewel Quilting Machine
The Baby Lock Jewel Quilting Machine utilizes high-tech electronics and an
innovative touch-pad user interface to offer greater functionality and ease of operation
to home quilters than ever before conceived in the quilting industry. The Baby Lock
Jewel Quilting Machine is a high quality machine that incorporates very robust design
features and is very easy to service.
The Baby Lock Jewel Quilting Machine is constructed following a specific sequence
of operations - similar to the construction of a house. Walls cannot be erected until
the foundation is in place. Similarly, this service manual has been written with an
adjustment logic that is driven by the construction processes used to create the
machine. If the service technician carefully follows the adjustment steps in the order
presented, a fine running sewing machine is possible each and every time.
About the Manual
The purpose of this service manual is to help the technician complete a repair on a
machine accurately and quickly. The manual is complete with photographs and
explanations that we hope will aid you in your repair efforts. In addition to the
teaching aids found herein, you will also find all of the tools listed that are necessary
for adjustments. If you need help in locating these tools for purchase, please contact
the company.
Service Manual General Rule
•Adjustments shown in the manual should only be made if a setting deviates from the
tolerance specified in the manual.
•Adjustments should be made only in the logical sequence shown and described in the
manual.
•Safety must be considered when working on any machine. Safety warnings are
included throughout this manual where appropriate, but these warnings do not
address all possible safety concerns that might confront the service technician.
•When working on or near any live electrical assemblies, the power cable must be
removed from the machine.
•We urge you to observe the cautions in the manual.
•Please note that the hand wheel must always be turned in the direction of normal
rotation unless otherwise instructed. This is especially true when making the loop lift
timing and needle height adjustment.

Baby Lock Jewel Service Manual
© Baby Lock, all rights reserved
5
General Specifications
Dimensions: (210 X 410 mm)
8.25” X 16.00”)
Sewing Speed: (Min 150spm,
Max, 1500 spm)
Needle System: 134R (135 X 7)
Needle Sizes, (recommended): 14/90 - 19/120
Hook System: (Rotary, custom made, Cerliani,
Type FA, Vertical, M Bobbin)
Bobbin Type: Aluminum, Class M
Bobbin Case: Cerliani, Type MF
Motor Type: Brushless DC, internal encoding
Needle Positioning: Up and down, full and half stitch
Electrical Power: 120 V, 60Hz, 150 W
LED Power Consumption: 20 W
Sew Foot Stroke/Lift: 5 mm
Needle Bar Stroke: 35.3 mm
Take-Up Stroke: 73 mm
Assembly Torque Specification
The Torque Specifications apply to all internal fasteners in sizes 4.0, 5.0, and 6.0mm
in general at ISO 4762 Screw class 8.8. The torque specifications are also generally
classified as soft jointed and are listed according to size and placement in the
machine.
1. 4 mm Allen Socket Head Cap Screws, Class 8.8 @2.5Nm
•Head-frame, and main bearing retainers
2. 5mm Allen Socket Head Cap Screw Class 8.8@ 5.6Nm
•Motor Frame Mounting
•Pulleys
•Collars
3. 6mm Allen Socket Head Cap Screws Class. 8.8 @ 9.9Nm.
•An exception must be observed here since the screws are considered soft
jointed and shallow threaded and are used externally. It is therefore advised
that this torque specification not exceed 6Nm.

Baby Lock Jewel Service Manual
© Baby Lock, all rights reserved
6
Fi
g
ure 2
Lubrication of the Hook
Apply one drop of oil to the raceway of the bobbin case support two to three times per day. This
application is based upon sewing for 8 hours of machine time. If the machine is used less, lubricate
the hook less frequently. After the lubrication of the hook, it is recommended that one momentarily
sew on scrap material before resuming the sewing of the quilt. Failure to do so may result in oil stains
on the quilt piece.
General Observation of the Front Frame Cover, Mast
and Hand Wheel
The following observations, accompanied by necessary adjustments, will ensure trouble-free thread
passage. Failure at any of these points will significantly affect thread tension.
Tools required: (2mm, 2.5mm handle Allen, 8mm open end
wrench)
Check:
1. The Spool Stand (mast) should be adjusted so that the eyelet
loops are centered directly over the spool pins.
•If a correction is necessary, loosen the jam nut, reposition
and tighten the jam nut.
Figure 1
Oiling location

Baby Lock Jewel Service Manual
© Baby Lock, all rights reserved
7
Fi
g
ure 3
4
5
1
2
3
Fi
g
ure 4
Figure 5
Split Shaft
2. Make sure that a gap of 1.0mm to 1.5mm exists
between the frame and the hand wheel. (Note: This
can only be adjusted when the front frame cover
has been removed.) See Figure 3.
•If a correction is necessary, loosen the hand
wheel set screw, (Note: this can only be done
after removing the front cover) position the
hand wheel and retighten the screw. (3mm
handle Allen
3. Inspect the condition of the thread guides
1, 2, and 3, and thread stirrup 4, and
thread guide 5 for any abrasions, cuts, or
electroplating blistering. Replace any
damaged parts as shown in Figure 4.
4. Check the top tension assembly for the following:
•A gap of 1.0mm to 1.5mm exists
between the frame boss and the
back disk of the tension assembly,
see figure 1.4. If a correction is
necessary: loosen screw. (2mm
handle Allen), adjust the gap
between the front cover and the
rear tension disk, and retighten
screw.
•Check between the tension disks
for any foreign material that could
prevent the disks from functioning
properly. If a correction is
necessary, remove the knob, tick
washer, tension disks, and core
spring. Clear and reassemble.
•Check that the take up spring has a normal torsion tension and inspect the spring for any
cut or abrasions. Adjust or replace if necessary.
•Check that the top tension knob has resistance and can not vibrate loose while sewing. To
correct: remove the knob, tick washer and core spring, adjust the split bolt by spreading
with a #3 flat-slot screw driver until the knob has adequate resistance to keep its setting.
•Check that the take-up spring is positioned to 11:00. if not loosen (2mm handle Allen) and
rotate split shaft.

Baby Lock Jewel Service Manual
© Baby Lock, all rights reserved
8
Replacement of cover
Replace the front cover in the reverse order that it was disassembled.
Note: See torque specifications chart in the specification section for torque values.
CAUTION: DANGER OF ELECTRICAL SHOCK – DANGEROUS VOLTAGES
Do not plug main power or run the sewing machine with the p-pod off of the machine
and or open so that human body part comes in contact with electrical energy.
Note 1: The C-Pod and the P-Pod are STATIC SENSITIVE parts and should not be handled without
special discharge tools. For this reason, all C and P Prints will be exchanged in the pod covers. Do
not remove the Printed Circuit Boards (PCBs) from the pods.
Note 2: The colored edge of the ribbon cable is always located on pin 1 of a plug socket. The motor,
opto-interrupter, and handle bar cable plugs are keyed.
Note 3: After installing the cables through the service hole on the front cover, carefully take out any
excess cable through the hole and fold inside of the pod covers. This will prevent any pinching or
subse
q
uent dama
g
e to the cables b
y
movin
g
p
arts.
C Print/Pod Cables D Print/Pod Cables

Baby Lock Jewel Service Manual
© Baby Lock, all rights reserved
9
Fi
g
ure 8
C
C
Removal of the Front Cover
Tools required: 2mm, 3mm, 4mm handle Allen, 4mm L Allen, #3 flat-slot screwdriver,
and #2 Phillips screw driver.
1. Loosen the set screw A in Figure 6, rotate the thread guide
to allow access to the frame screw, then re-snug. (2mm
handle Allen tool)
2. Remove the three frame screws as shown in Figure 7.
(3mm handle Allen tool)
3. Remove the “C-pod” by unscrewing the 4 screws “C” in Figure
8. (#2 Phillips screwdriver)
4. Carefully unplug the cables from the C-print and pod. Be careful
not to touch the C-print. Figure 9. See plug configuration on
page 8.
A
Fi
g
ure 6
Fi
g
ure 9
Fi
g
ure 7

Baby Lock Jewel Service Manual
© Baby Lock, all rights reserved
10
Figure 10
D
Fi
g
ure 11
5. Remove the needle plate. Figure 10. (#3 flat-slotted
screwdriver)
6. Remove the 5 frame screws “D”
in Figure 11. Note: The fifth
screw is behind the C-print
removed in step 4. (4mm
handle Allen – may need 4mm
L Allen tool to break loose
screws)
7. Separate the Front Frame Cover. Make sure the take up lever does not get caught in the
frame slot.
Note: If the frame cover is not easily removed, loosen the front base plate screws. (5mm
handle Allen)