JUKI LZ-2290C/X73257 User manual

LZ-2290C / X73257
INSTRUCTION MANUAL / PARTS LIST
This Instruction Manual only describes the setup and operation methods for the stitch skipping/double
catching detection device (SD-29) for the LZ-2290C Series of sewing machine.
Refer to the documents (Instruction Manual and Safety Precautions) for the LZ-2290C Series of sewing
machine for descriptions about parts other than the stitch skipping/double caching detection device (SD-29).

CONTENTS
Preface................................................................................................................................. 1
1. Parts supplied with the device (Parts of the SD-29 device) ....................................... 2
2. Installing the under cover.............................................................................................. 3
3. Writing the software for electrical components (for a limited time).......................... 4
4. Assembling the sensor amplifier components............................................................ 6
5. Assembling the sensor head components .................................................................. 7
6. Connecting the cords (1) - On the sensor amplifier side - ......................................... 8
7. Connecting the cords (2) - Sensor head side -............................................................ 9
8. Adjusting the sensor position..................................................................................... 11
9. Turning the sensor ....................................................................................................... 14
10. DPC function............................................................................................................... 16
11. Solution viewer function ............................................................................................ 18
11-1. Specification values and handling method .................................................................. 18
11-2. Procedure for checking the solution viewer ................................................................ 19
11-3. How to turn ON and OFF the solution viewer .............................................................. 19
12. Setting the functions on the operation panel .......................................................... 20
12-1. Messages on the operation panel ................................................................................. 20
12-2. Set values of memory switches .................................................................................... 21
12-3. Sewing pattern data........................................................................................................ 23
13. Flow of work by maintenance personnel ................................................................. 24
13-1. Replacing the thread, material and gauge ................................................................... 24
13-2. Procedure for replacing the hook and for adjusting the hook timing ....................... 26
14. Operating and bobbin-changing procedures .......................................................... 28
14-1. Sewing method ............................................................................................................... 28
14-2. Method for changing the bobbin................................................................................... 29
14-3. Method for unlocking and locking the index plunger (at two locations)................... 30
15. Parts list ...................................................................................................................... 31
16. Optional parts ............................................................................................................. 34
17. Additional function for the standard sewing machine............................................ 36
17-1. Low tension sewing (AT low output mode) .................................................................. 36
17-2. Correction of the shape length of sewing pattern....................................................... 37
18. Troubleshooting ......................................................................................................... 38
・
The work required to set up the sewing machine is described in "2. Installing the under
cover" p.3 to "12. Setting the functions on the operation panel" p.20.
・
The work required before putting the sewing machine into sewing process should be
carried out referring to "13. Flow of work by maintenance personnel" p.24 to 26.
・
Operators in charge of sewing should refer to "14. Operating and bobbin-changing
procedures" p.28 to 30.
i

– 1 –
[ SD-29 ]
SD-29 is the device that displays errors on the operation panel to notify the occurrence of below-stated mal-
functions including stitching failure.
Stitching failure "stitch skipping" has occurred.
Stitching failure "needle thread breakage" has
occurred.
M640
Stitch skipping is detected
Stitching failure "double catching" has occurred. M641
Double catching is detected
Sewing machine runs with neither bobbin nor bobbin case.
Sewing machine runs while the operation plate (sensor) of
the SD-29 is not put in its normal position.
M642
Light quantity of the stitch
skipping detection sensor has
decreased
The timing to display errors (to stop the sewing machine immediately, to stop the sewing ma-
chine at the time of thread trimming, etc.) and the number of times of occurrence of an error
until the error is detected (when thread skipping occurs twice, etc.) can be changed by chang-
ing the relevant settings on the operation panel.
Normally, the needle thread crosses this side of the bobbin case once per single rotation of the main shaft (one
stitch).
In the case of stitching failure, on the contrary, the needle thread does not cross this side of the bobbin case
as described above. In the case of a stitch skipping, the needle thread does not cross this side of the bobbin
case at all, or in the case of a double catching, the needle thread crosses there twice.
This device monitors the needle thread that crosses this side of the bobbin case by irradiating the sensor
light on the bobbin case and returning the refracted/reflected light back to the sensor.
[ Principle of the SD-29 ]
Preface
Sensor
Reflective
seal
Bobbin case
Principle Thread path
Light path
Needle thread
Sensor light
Bobbin case

– 2 –
1. Parts supplied with the device (Parts of the SD-29 device)
❶Sensor head asm.
(1 piece)
❷Operation plate
asm. (1 piece)
❸Reflective plate asm. (1 piece)
❶❸… M3 setscrews, washers (2 x 2 pieces each)
❷…… M4 setscrews (2 pieces)
❹…… 15/64 thread 40 setscrews, washers, spring
washers (2 pieces each)
Sensor head components
Sensor amplifier components
Sensor amplifier asm. (1 piece)
Sensor amplifier mounting base
asm. (1 piece)
Support rod (2 pieces), Washer
(4 pieces), setscrew (2 pieces),
Ground wire (1 piece)
Under cover asm.
Miscellaneous
Plated bobbin case (1 piece) Parts No. 40234314
Cable clip band, small (5 pieces)
Cable clip band, large (1 piece)
Cord clamp (1 piece)
Cord clamp setscrew (1 piece)
Reflective seal (1 piece) * Spare part
If the current reflective seal is so con-
taminated with oil and cloth chips as
to cause a device error, remove it and
stick the spare reflective seal.
In order to maintain performance of the SD-29 for a long time, the X73257 model is provided with a plated
bobbin case (part number: 40239314) as a rust preventive measure.
If it is hard to see the laser light when adjusting the sensor position as de-
scribed in "8. Adjusting the sensor position" p.11, replace the plated
bobbin case with the existing (separately available) non-plated bobbin case
(part number: 40125507) and adjust the sensor position. Once you have ad-
justed the sensor position correctly, remove the non-plated bobbin case and
re-attach the plated bobbin case for use.
* For the plated bobbin case (part number: 40239314), its part number is
inscribed on its side face as shown in the figure given on the right.
[ Bobbin case ]

– 3 –
2. Installing the under cover
The under cover for the stitch skipping/double catching detection device differs from that for the standard
sewing machine in shape of the front section as shown in the figure given below.
When using the stitch skipping/double catching detection device with your sewing machine, the under cover
for the standard sewing machine should not be used.
Under cover for the standard
sewing machine
Under cover dedicated for the stitch skip-
ping/double catching detection device
Refer to "2-1" to "2-19" in the Instruction Manual for the LZ-2290C Series of sewing machine for the installa-
tion method of the under cover and for the setup method of the main body of sewing machine and electrical
components (excluding the stitch skipping/double catching detection device).
* For the SD-29 (in the case "U220 Stitch skipping and double catching detecting function" is set to "1:
Enable"), the maximum sewing speed of the sewing machine is limited to 4000 sti/min. Consequently,
the LZ-2290C/X73257 is not provided with the hook cooling fan. (Maximum sewing speed of the stan-
dard sewing machine: 5000 sti/min).
When the SD-29 is not used (in the case "U220 Stitch skipping and double catching detecting function"
is set to "2: Disable") or when there is a risk that the hook becomes hot due to the environmental tem-
perature, the optional part (separately available), hook cooling set (part number: 40250042) should be
used.

– 4 –
3. Writing the software for electrical components (for a limited time)
In the case of using the stitch skipping/double catching detection device, the dedicated software for the elec-
trical components is required. (This software is different from that for the standard sewing machine.)
The software for the standard sewing machine will be interchangeable with the dedicated software after
changing its design. At the present, however, it is necessary for you to re-write the software for the electrical
components until JUKI completes the change in design.
● Re-writingprocedure
①Insert the USB memory.
The USB connector is provided on top ❶ of the
operation panel.
To use a USB thumb drive, remove connector
cover ❷and insert the USB thumb drive into the
USB connector.
* In the case a USB thumb drive is not used,
the USB connector should be protected with
connector cover ❷without exceptions.
If dust or the like enters the USB connector,
a failure can be caused.
②Turning ON the power to the sewing machine.
Turn ON the power switch located on the table
while keeping ❸held pressed.
* Keep ❸held pressed until the data
communication screen appears on the opera-
tion panel.
❷
❶
❸
③Writing the SC software
1. Press .
2. Press "7. Re-write SC software".
3. Check the version of the software.
❹❺
The version of the software that is
required to be re-written is "01.03.02-
61".
4) Press ❹.
④Updating the software.
Do not turn the power OFF even when
"100%" is displayed on the operation
panel screen.

– 5 –
⑤Turning OFF the power to the sewing machine.
* Turn OFF the power switch located on
the table after the screen as shown in the
figure on the left appears on the operation
panel.
Re-turn ON the power to the sewing
machine after the green lamp located
on the upper part of the operation
panel goes out.
[ In the case of the LZ-2290C-F ]
After the completion of the aforementioned steps of procedure, also re-write the SUB software.
The SUB software re-writing procedure is same with ①to ⑤as described above excluding ③-2 and ③-3.
In the case of re-writing the SUB software, steps of procedure ③-2 and ③-3 are as described below.
③-2. Press "8. Re-write SUB software".
③-3. Check the version of the software.
The version of the software that is required to be re-written is "01.01.07".

– 6 –
4. Assembling the sensor amplifier components
WARNING
1. Be sure to turn OFF the power to the sewing machine for the sake of safety before assembling the sen-
sor amplifier components.
2. Be sure to firmly tighten the screws to prevent them from loosening by vibration when the sewing ma-
chine is in operation.
①Attach washers ❶(four pieces) and support rods ❷(two pieces) to the main body of sewing machine.
②Put sensor amplifier mounting base asm. ❸on ①and secure with setscrews ❹(two pieces).
③Detach the fixing plate and the fixing plate setscrews from sensor amplifier mounting base asm. ❸(one
piece). Then, fit sensor amplifier asm. ❺in the sensor amplifier mounting plate.
④Secure sensor amplifier asm. ❺to sensor amplifier mounting base asm. ❸(one piece) with the fixing
plate and the fixing plate setscrews.
❶
❸
Fixing plate setscrew
❺
❹
Fixing plate
❶
❷

– 7 –
5. Assembling the sensor head components
①Tilt the main body of sewing machine.
②Assembling the sensor head components.
Attach operation plate asm. ❶with setscrews ❷(two pieces).
Attach sensor head asm. ❸with setscrews ❹(two pieces).
③Raise the main body of sewing machine.
It is recommended to roughly determine the mounting position of operation plate asm. ❶in
advance using the jig that will also be used in"8. Adjusting the sensor position" p.11.
Carefully prevent operation plate asm. ❶from interfering with the under cover when raising the
main body of sewing machine.
❶❷
❸
❹
WARNING
1. Be sure to turn OFF the power to the sewing machine for the sake of safety before assembling the sen-
sor amplifier components.
2. Be sure to firmly tighten the screws to prevent them from loosening by vibration when the sewing ma-
chine is in operation.

– 8 –
6. Connecting the cords (1) - On the sensor amplifier side -
①Open the cover of sensor amplifier ❶. Connect
the connector of sensor head ❷.
②Close the cover of sensor amplifier ❶.
Take care not to allow the cords to be
caught under the cover.
❷❷
❶❶
❻❻
❺❺
❸❸❹❹③Attach ground wire ❸using amplifier fixing plate
setscrews ❹.
④Pass cable clip band, small ❻through the hole in
sensor amplifier mounting base ❺and secure the
sensor amplifier cords and sensor ground wire ❸
(totally three pieces) with cable clip band, small
❻.
⑤Secure the cords described in the aforementioned
step ④with cable clip band, small ❻approxi-
mately 25 cm away from the previously secured
position.
⑥Bind the cord coming from the pulley cover and
the cords described in the aforementioned step
⑤together with cable clip bands, large ❼.
[ Only for the BB type models (EU type models) ]
Clamp the three cords described in the aforemen-
tioned step ⑥with core ❽ (large) (diameter: φ23
mm).
Secure the cords clamped with core ❽(large) with
cable clip bands, large ❼to prevent the core from
moving out of position.
❼❼
❽❽
❻❻
WARNING
1. Be sure to turn OFF the power to the sewing machine for the sake of safety before assembling the sen-
sor amplifier components.
2. Be sure to firmly tighten the screws to prevent them from loosening by vibration when the sewing ma-
chine is in operation.