JUKI MEB-3200 Series Quick start guide

R
ENGINEER’S MANUAL
29346202
No.E345-04
Direct-drive Computer-controlled Eyelet Buttonholing
Machine (with Compound Thread Trimmer)
MEB-3200

PREFACE
This Engineer’s Manual is written for the technical personnel who are responsible for the service and maintenance
of the sewing machine. This manual describes “Adjustment Procedure”, “Results of Improper Adjustment”, and
other functions which are not covered by the Instruction Book intended for the maintenance personnel and
sewing operators at a sewing factory.
All personnel engaged in repair of MEB-3200 are required to carefully read Section 2 “Standard Adjustment”
which contains important information on the maintenance of MEB-3200.
The “Standard Adjustment” consists of two parts ; the former part presents illustration and simplified explanation
for the convenience of reconfirmation of the required adjustment values in carrying out actual adjustment after
reading this manual once; and the latter part provides “Results of Improper Adjustment” in which sewing and/or
mechanical failures, and the correcting procedures are explained for those persons who perform such adjustment
for the first time.
It is advisable to use “MEB-3200 Parts Book” together with this Engineer’s Manual.

CONTENTS
1. SPECIFICATIONS .......................................................................................................... 1
2. NAME OF EACH COMPONENT .................................................................................... 2
(1) Names of the sewing machine main unit .......................................................................................... 2
3. STRUCTURE OF THE OPERATION SWITCH .............................................................. 3
(1) Structure of the operation panel ....................................................................................................... 3
(2) Temporary stop switch...................................................................................................................... 5
(3) Hand switch ...................................................................................................................................... 5
(4) Foot switch........................................................................................................................................ 5
4. STANDARD ADJUSTMENTS ........................................................................................ 6
(1) Adjusting the center of the needle .................................................................................................... 6
(2) Adjusting the stitch base line of the inside needle ............................................................................ 8
(3) Adjusting the stitch bite width ........................................................................................................... 8
(4) Height of the needle bar ................................................................................................................. 10
(5) Timing between the needle and the looper.....................................................................................10
(6) Clearance between the needle and the looper ............................................................................... 12
(7) Adjusting the needle guard ............................................................................................................. 12
(8) Installation positions of the spreaders and the timing to open/close the spreaders ....................... 12
(9) Adjusting the cloth open ................................................................................................................. 14
(10) Adjusting the presser ...................................................................................................................... 16
(11) Adjusting the knife .......................................................................................................................... 16
1) Adjusting the longitudinal position of the cloth cutting knife ................................................................................................. 16
2) Adjusting the lateral position of the cloth cutting knife ......................................................................................................... 18
3) Adjusting the inclination of the cloth cutting knife................................................................................................................. 18
(12) Adjusting the knife holder ............................................................................................................... 20
1) Adjusting the longitudinal position of the knife holder .......................................................................................................... 20
2) Adjusting the lateral position of the knife holder................................................................................................................... 20
3) Adjusting the inclination of the knife holder and the backlash of the cloth cutting direct drive shaft .................................... 22
(13) Installing position of the needle thread trimming knife.................................................................... 24
(14) Adjusting the needle thread trimming vertical moving arm ............................................................. 30
(15) Adjusting the looper thread and gimp trimming .............................................................................. 32
(16) Adjusting the short thread trimming without gimp (T type) ............................................................. 34
(17) Adjusting the position of the looper thread guide plate and the inclination of the counter knife (S/R types) .................. 36
(18) Adjusting the looper thread clamp and the thread hauling (S/R types) .......................................... 38
(19) Adjusting the blade pressure of the looper thread trimming knife (S/R types)................................ 40
(20) Adjusting the short thread trimming ................................................................................................ 42
1) Initial position of the lower knife ........................................................................................................................................... 42
2) Adjusting the stroke of the upper knife ................................................................................................................................. 42
3) Adjusting the knife pressure................................................................................................................................................. 44
4) Adjusting the position of the thread haul plate ..................................................................................................................... 44
5) Adjusting the position of the upper knife lower cover........................................................................................................... 46
(21) Adjusting the needle thread clamp ................................................................................................. 48
(22) Adjusting the length of remaining needle thread ............................................................................ 50
(23) Adjusting the feeding amount of the needle thread ........................................................................ 50
(24) Adjusting the haul amount of the looper thread (long thread trimming/short thread trimming) .................... 52
(25) Adjusting the looper thread haul driving arm (long thread trimming) .............................................. 54
(26) Adjusting the remaining amount of the gimp (J/C types) ................................................................ 56
(27) Adjusting the tension of the needle bar rotary timing belt............................................................... 56
(28) Adjusting the tension of the looper turning timing belt .................................................................... 58
(29) Adjusting the position of the needle bar rotary pulley ..................................................................... 58
(30) Adjusting the position of the looper bracket.................................................................................... 60
(31) Adjusting the main shaft sensor...................................................................................................... 60
(32) Adjusting the origin position of the crosswise feed sensor ............................................................. 62
(33) Adjusting the origin position of the lengthwise feed sensor ............................................................ 62
(34) Adjusting the cloth cutting origin sensor ......................................................................................... 64
(35) Adjusting the backlash of the cloth cutting stepping motor............................................................. 66
(36) Adjusting the cloth cutting lever stopper ......................................................................................... 66
(37) Adjusting the positions of the lengthwise feed and crosswise feed motor installing bases
(Adjusting the backlash of the feed drive gear)....................................................................................... 68
(38) Adjusting the thread take-up thread guide...................................................................................... 68
(39) Adjusting the active tension ............................................................................................................ 70
(40) Adjusting the cloth cutting knife pressure ....................................................................................... 72

5. DISASSEMBLY/ASSEMBLY ....................................................................................... 74
(1) Disassembling the needle bar driving gear..................................................................................... 74
(2) Disassembling the needle bar arm ................................................................................................. 76
(3) Adjusting the backlash of the needle bar driving gear .................................................................... 76
(4) Disassembling the cloth cutting mechanism................................................................................... 78
(5) Installing the cloth cutting plate....................................................................................................... 78
(6) Replacing the main shaft timing belt ............................................................................................... 80
(7) Replacing the needle bar rotary upper timing belt .......................................................................... 82
(8) Replacing the needle bar rotary lower timing belt........................................................................... 84
(9) Disassembling the marking light ..................................................................................................... 86
(10) Fine adjustment of the laser marking projector............................................................................... 88
1) Adjusting the light axis of the laser marking projector .......................................................................................................... 88
2) Adjusting the lateral direction of the laser marking projector ............................................................................................... 90
3) Adjusting the irradiating range of the laser beam................................................................................................................. 90
(11) Replacing the presser set ............................................................................................................... 92
(12) Removing procedure of the looper thread trimming unit (When sewing beyond 38 mm) .......................... 94
6. SETTING PROCEDURE OF THE SEWING DATA...................................................... 96
(1) Sewing data setting item................................................................................................................. 97
1) Compensation of the data .................................................................................................................................................. 101
1Compensation table .................................................................................................................................................... 102
2Thread tension compensation table ............................................................................................................................ 103
7. MEMORY SWITCH..................................................................................................... 105
(1) Setting the memory switch............................................................................................................ 105
(2) Initializing the memory switch ....................................................................................................... 105
(3) Setting the DIP switch................................................................................................................... 105
(4) Memory switch list ........................................................................................................................ 106
8. TEST MODE ............................................................................................................... 109
(1) Input check ................................................................................................................................... 109
(2) Output check................................................................................................................................. 110
(3) Operation panel check.................................................................................................................. 110
(4) Crosswise feed / lengthwise feed / turning origin check ............................................................... 111
(5) Cloth cutting knife origin check ..................................................................................................... 111
(6) Sewing machine check ................................................................................................................. 112
(7) Thread tension check ................................................................................................................... 112
(8) Thread trimming check ................................................................................................................. 112
9. ERROR LIST .............................................................................................................. 113
10. REPLACING THE FUSE .......................................................................................... 114
11. CHANGING THE VOLTAGE .................................................................................... 115
(1) Changing the voltage between 100 and 240V.............................................................................. 115
(2) Changing the voltage between between 220 and 415V ............................................................... 115
12. TROUBLES AND CORRECTIVE MEASURES........................................................ 116
13. AIR PIPING DIAGRAM............................................................................................. 120
14. CIRCUIT DIAGRAM ................................................................................................. 121
(1) Connector circuit board wiring diagram ........................................................................................ 121
(2) Main circuit board wiring diagram ................................................................................................. 121
(3) Block diagram (1) 1 / 2.................................................................................................................. 122
(4) Block diagram (2) 1 / 2.................................................................................................................. 124
(5) Block diagram (3) 1 / 2.................................................................................................................. 126
(6) Stepping motor circuit diagram ..................................................................................................... 128
(7) Sensor circuit diagram .................................................................................................................. 129
(8) Power source circuit diagram 100V, 200V.................................................................................... 130
(9) Power source circuit diagram 380V .............................................................................................. 131
(10) Solenoid valve curcuit diagram..................................................................................................... 132
(11) Active tension curcuit diagram...................................................................................................... 133
(12) Servo motor circuit diagram.......................................................................................................... 134
15. MULTICUTTING DEVICE......................................................................................... 135

−1−
Item
Application
Sewing speed
Thread trimming type
Stitch length (Caution 1)
Stitch bite width (Caution 2 and 3)
Taper bar length
Lift of presser foot
Method of changing sewing shape
Buttonhole cutting system
Feed system
Cloth cutting drive
Needle (Caution 2)
Safety device
Lubricating oil
Air pressure
Air consumption
Dimensions
Power consumption
Gross weight
Noise
1. SPECIFICATIONS
S type, R type
Men’sandladies’wear
Long thread trimming
10 to 38 mm (with
looper thread trimmer)
10 to 50 mm (In case
looper thread trimming
device is removed)
2.0 to 3.2 mm 0 mm, 3 to 15 mm
13 mm (Max. 16 mm)
Program selection method
Cut-before knife, cut-after knife, without knife
Intermittent feed by stepping motor
Vertical drive by stepping motor (Pressure can be adjusted.)
DOX558 #90 to 110 DOX558 #90 to 110 DOX558 #110 to 120 DOX558 #100 to 110
Temporary stop switch and automatic stop function
at the time of detection of trouble
JUKI New Defrix Oil No. 2 (Equivalent to ISO VG32)
0.49 Mpa
6R/ min (8-cycle/min)
1,060 mm (W) X 790 mm (L) X 1,230 mm (H) (Excluding thread stand)
550 VA
185 kg
Workplace-related noise at sewing speed
n=2,000min-1 : LPA 81.5 dB (A)
Noise measurement according to DIN 45635-48-B-1.
J type
Jeans
24 to 32 mm (Standard)
* For the shapes of
taperbarandwithout
bar-tacking, up to 34
mm
2.0 to 4.0 mm
Short thread trimming
C type
Cotton pants, working wear
16to24mm(Standard)
* For the shapes of
taper bar and without
bar-tacking, up to 26
mm
Caution 1 : For the short thread trimming type, stitch length can be changed by changing the optional presser set.
S set : 16 to 24 mm, M set : 24 to 32 mm, L set : 32 to 40 mm
(26) * (34) * (42) *
Caution 2 : Stitch bite width and needle size at the time of delivery are as follows.
(When changing stitch bite width or needle size, check installing position and open/close timing of
needle, looper, and spreader, and clearance between needle and needle guard.)
Caution 3 : By changing to the optional looper, left and spreader left, the range of stitch bite width can be changed
from 2.0 to 3.2 mm /2.6 to 4.0 mm. (S/J/C types only excluding T type)
Caution 4 : In case of the machine with needle thread clamp device and multicutting device, read the Instruction
Manuals for the respective devices together with this Engineer’s Manual.
Caution 5 : For T (slacks) type, sewing with gimp cannot be performed. In addition, the presser foot is provided
with S set which is adaptable to the extent of stitch length of 24 mm.
Stitch bite width
Needle size
S and R types
2.8 mm (Domestic),
2.3 mm (Export)
#100
J type
3.6 mm (Domestic),
2.5 mm (Export)
#110 (Domestic),
#120 (Export)
C type
2.5 mm
#110
T type
Slacks
Short thread trimming
without gimp
Compensating foot
S : 16 to 24 mm
(Standard)
10 to 34 mm
2.0 to 3.2 mm
T type
2.3 mm
#100
400 to 2,200 rpm (adjustable in 100 rpm steps)
* In case of taper bar and
without bar-tacking

−2−
2. NAME OF EACH COMPONENT
(1) Names of the sewing machine main unit
1Temporary stop switch
2Presser switch
3Start switch
4Operation panel
5Control box
6Power switch
7Hand pulley
8Machine head
9Thread stand
!0 Feed base
!1 Cloth cutting dial
1
2
3
4
5
6
7
8
9
!0
!1
!1
7

−3−
3. STRUCTURE OF THE OPERATION SWITCH
(1) Structure of the operation panel
[Table of functions of the operation panel]
No.
1
2
3
4
5
Name
Sewing LED
READY key
RESET key
THREAD key
FORWARD key
Description
ThisLEDlightsupwhenthesewing
machine can be operated.
Setting ,/ sewing ready can be
changed over alternately every
time this key is pressed.
Errorrelease(at thetimeofvarious
errors)
Reset of the production counter
Move of the feed setting position
Release of the threading mode
Needle bar rotates when this key
ispressedandthe mode becomes
the threading mode. (See
Instruction Manual, p.16.) (When
the sewing LED lights up.)
When this key is pressed, the feed
mechanism travels forward stitch
by stitch.
No.
6
7
8
9
!0
Name
BACK key
2-digit LED
LEFT “ – ” key
LEFT “ + ” key
4-digit LED
Description
When this key is pressed, the
feed mechanism travels
backward stitch by stitch.
This LED displays pattern No.
normally.
Data No. is displayed at the time
of data setting.
This key subtracts pattern No. or
data No.
ThiskeyaddspatternNo. ordata
No.
This LED displays cut length,
contents of data setting, counter
value, error No., etc.
123456
7
8
9
!0
!1
!2
!3
!4
!5
!6
!7
!8
!9
@0
@1
@2
@3
@4
@5
@6
@7
@8
@9
#0
#1
#2 #3 #4 #5
READY

−4−
NO.
!1
!2
!3
!4
!5
!6
!7
!8
!9
@0
@1
@2
Name
RIGHT “ – ” key
RIGHT “ + ” key
PATTERN key
DATA key
COUNTER key
NEEDLE key
LOOPER key
LENGTH key
STITCHES
(Number of stitches
of parallel)
key
STITCHES
(Number of stitches
of eyelet)
key
SPACE
(Cut space)
key
SPACE (Eyelet
space) key
Description
This key subtracts various
data.
This key adds various data.
This key performs display
and setting of pattern No.
This key performs display
and setting of DATA No.
This key performs display
and setting of counter.
This key performs display
and setting of needle thread
tension data.
This key performs display
and setting of looper thread
tension data.
This key sets the length to
be sewn.
Note 1
This key sets the number of
stitches of the parallel
section.
Note 1
This key sets the number of
stitches of the eyelet
section.
Note 1
This key sets clearance
between cloth cutting knife
and sewing at the parallel
section. Note 1
This key sets clearance
between cloth cutting knife
and sewing at the eyelet
section. Note 1
NO.
@3
@4
@5
@6
@7
@8
@9
#0
#1
#2
#3
#4
#5
Name
LENGTH (Taper bar
length) key
Note 1
STITCHES (Number
of stitches
of taper bar)
key
OFFSET
(Taper bar
offset) key
MAX
(Sewing
speed) key
EYELET
(Eyelet speed
setting) key
KNIFE
(Knife ON/
OFF)key
CB
(Before-cut
knife) key
CA
(After-cut
knife) key
SHAPE
(Knife No.)
key
AUTO
(Auto
operation)
key
OPEN
(Cloth
open) key
ADJUST
(Knife adjust)
key
FUNCTION
(Function) key
Description
This key sets sewing length
of taper bar.
Note 1
This key sets the number of
stitches of taper bar.
Note 1
This key sets the slip
amount of taper bar.
Note 1
This key performs setting of
sewing speed.
Note 1
This key performs setting of
reduced speed at eyelet
section.
Note 1
This key sets effective/
ineffective of knife.
Note 3
This key performs data
setting of before-cut knife.
Note 2
This key performs data
setting of after-cut knife.
Note 2
This key selects the No. of
kind of knife to be used.
Note 1
This key performs change-
over of automatic and
manual operation modes.
The mode becomes the one
operatingwith the cloth open
mechanism opened.
The mode becomes the one
of cloth cutting knife
adjustment by turning ON
the power with this key held
pressed.
This key can be changed to
optionaldatasettingfunction
key with the memory switch.
At the time of delivery
F1 : Knife position adjustment (No. 8)
F2 : Copy destination No. (No. 80)
Note 1 :When changing the set value, operate the panel in the state that the sewing LED has gone out.
Note 2 :When both the before-cut and after-cut knives are not selected (set value : “0”), the data without knife
is selected.
Note 3 :Effective / ineffective of knife operation can be selected in case of the before-cut and after-cut knives,
however, in case of the data without knife, the knife operation cannot be performed.

−5−
(2) Temporary stop switch This switch stops the operation of the sewing machine.
(3) Hand switch 1) Presser switch (right) 1
™This switch performs up/down of the presser.
2) Start switch (left) 2
™This switch performs the start of sewing.
™Whenthe start switch iseffective, the startswitch
lamp flashes on and off.
™This switch is provided as standard.
(4) Foot switch 1) Presser switch 1
™This switch performs up/down of the presser.
2) Start switch 2
™This switch performs the start of sewing.
™This switch is optional.
Temporary stop
switch
1
2
1
2
Start switch lamp

−6−
4. STANDARD ADJUSTMENTS
(1) Adjusting the center of the needle
Standard Adjustment
1Clearance between the needle and the left looper
2Timing between the needle and the left looper
1
2
3
4
Needle
Left Looper
0.03 to 0.1
0.03 to 0.1
0.03 to 0.1
0.03 to 0.1
Sewing start side Eyelet buttonhole
section Sewing end side Straight bar side
To align
the center To align the center
To align
the center To align
the center
Sewing start side Eyelet buttonhole
section Sewing end side Straight bar side