Janome MS5027PR User manual

SERVICE MANUAL
SEWING MACHINE MODEL
MS5027PR

CONTENTS
LOCATE AND IDENTIFYTHE PARTS ......................................................................... 1
WHAT TO DO WHEN .................................................................................................. 2-4
THREADING OF MACHINE ....................................................................................... 5-6
SERVICE ACCESS
FACE COVER....................................................................................................... 7
TOP COVER......................................................................................................... 7
BASE PLATE ........................................................................................................ 8
BED COVER......................................................................................................... 8
BELT COVER ....................................................................................................... 9
FREE ARM COVER ............................................................................................. 9
FRONT COVER.................................................................................................... 10
REAR PANEL ....................................................................................................... 11
MECHANICAL ADJUSTMENT
TOP TENSION...................................................................................................... 12
PRESSER BAR HEIGHT AND ALIGNMENT....................................................... 13
NEEDLE SWING .................................................................................................. 14
STRAIGHT STITCHING .................................................................................. 15-16
DISTRIBUTION OF NEEDLE SWING............................................................. 17-18
STRETCH STITCH BALANCE........................................................................ 19-20
FEED DOG HEIGHT ................................................................................................ 21
NEEDLE BAR HEIGHT ........................................................................................ 22
NEEDLE TO HOOK TIMING................................................................................. 23
NEEDLE CLEARANCE TO HOOK ....................................................................... 24
BACKLASH (LOWER SHAFT GEAR) .................................................................. 25
BUTTONHOLE STITCH BALANCE ................................................................ 26-27
NEEDLE POSITION ........................................................................................ 28-29
ZERO FEEDING.............................................................................................. 30-31
BASIC NEEDLE POSITION ................................................................................. 32
BUTTONHOLE FUNCTION (1) ............................................................................ 33
BUTTONHOLE FUNCTION (2) ............................................................................ 34
REPLACEMENT AND ADJUSTMENT OF NEEDLE THREADER PLATE ........... 35
MOTOR BELT TENSION ...................................................................................... 36
OILING.......................................................................................................................... 37
WIRING OFTERMINAL BLOCK.................................................................................. 38
SPECIALTOOLS REQUIRED...................................................................................... 39
PARTS LIST............................................................................................................. 40-61

1
MS5027PR
LOCATE AND IDENTIFY THE PARTS
Snap-on Button
Nomenclature Plate
Needle Clamp
Presser Foot
Thumb Screw
Presser Foot
Reverse Stitch Control
Extension Table (Accessory Storage Box)
Upper Thread Guide
Take-up Lever
Top Tension Control
Face Cover Plate
Thread Cutter
Needle Plate
Hook Cover Plate
Hook Cover Plate Release Button
Spool Pin Bobbin Winding Spindle
Stitch Width Control
Stitch Length Setting Display
Stitch Length Control
Buttonhole Pitch Balance Adjusting Lever
Carrying Handle
Presser Foot Lever
Free Arm
Drop Feed Lever
Machine Socket
Power Switch
Stretch Stitch Adjuster
Buttonhole Lever
Needle Threader
Stitch Width Setting Display
Handwheel
Stitch Selector

2
MS5027PR
WHAT TO DO WHEN
CONDITION CAUSE HOW TO FIX REFERENCE
1. SKIPPING 1. NEEDLE IS NOT INSERTED INSERT THE NEEDLE PROPERLY.
STITCHES PROPERLY.
2. NEEDLE IS BENT OR WORN. CHANGE THE NEEDLE.
3. INCORRECTLY THREADED RETHREAD.
4. NEEDLE OR THREAD ARE USE THE RECOMMENDED
INAPPROPRIATE FOR SEWING NEEDLE AND THREAD.
FABRIC BEING SEWN.
5. SEWING ON STRETCH USE A #11 BLUE TIP NEEDLE.
FABRIC
6. PRESSER FOOT PRESSURE ADJUST THE PRESSER BAR
IS TOO WEAK. LEVEL TO MAKE THE
PRESSURE STRONGER.
7. INAPPROPRIATE NEEDLE SEE MECHANICAL P.22
BAR HEIGHT ADJUSTMENT
“NEEDLE BAR HEIGHT”.
8. INAPPROPRIATE NEEDLE SEE MECHANICAL P.23
TO HOOK TIMING ADJUSTMENT
“NEEDLE TO HOOK TIMING”.
9. INAPPROPRIATE NEEDLE SEE MECHANICAL P.24
TO HOOK CLEARANCE ADJUSTMENT “NEEDLE
CLEARANCE TO HOOK.”
2. FABRIC NOT 1. PRESSER FOOT PRESSURE ADJUST THE PRESSER BAR
MOVING IS TOO WEAK. LEVEL TO MAKE THE
PRESSURE STRONGER.
2. INCORRECT F.D. HEIGHT SEE MECHANICAL P.21
ADJUSTMENT “FEED DOG
HEIGHT.”
3. F.D. IS IN DOWN POSITION. RAISE THE F.D. LEVEL.
4. THREAD ON BOTTOM SIDE MAKE SURE TO BRING
OF FABRIC IS JAMMED UP. BOTH NEEDLE AND BOBBIN
THREAD UNDER THE FOOT
WHEN STARTING SEWING.
5. FEED DOG TEETH ARE CHANGE THE FEED DOG.
WORN.

3
MS5027PR
CONDITION CAUSE HOW TO FIX REFERENCE
3. BREAKING 1. INITIAL SEWING SPEED IS START WITH MEDIUM SPEED.
UPPER TOO FAST.
2. THREAD PATH IS USE THE PROPER THREAD
INCORRECT. PATH.
3. NEEDLE IS BENT OR DULL. REPLACE WITH A NEW NEEDLE.
4. UPPER THREAD TENSION IS ADJUST UPPER THREAD
TOO STRONG. TENSION CORRECTLY.
5. NEEDLE SIZE IS USE APPROPRIATE NEEDLE
INAPPROPRIATE FOR FOR FABRIC AND THREAD
FABRIC. IN USE.
6. NEEDLE EYE IS WORN. CHANGE THE NEEDLE.
7. NEEDLE HOLE IN NEEDLE REPAIR THE HOLE OR
PLATE IS WORN OR BURRED. REPLACE THE NEEDLE PLATE.
4. BREAKING 1. INCORRECTLY THREADED THREAD BOBBIN CORRECTLY.
BOBBIN BOBBIN.
2. TOO MUCH THREAD IS ADJUST THE POSITION OF
ON THE BOBBIN. STOPPER.
3. LINT IS STUCK INSIDE THE CLEAN THE HOOK.
BOBBIN HOLDER.
4. THREAD QUALITY IS
CHANGE TO A HIGHER QUALITY
TOO LOW. SEWING THREAD.
5. THREAD IS JAMMING CLEAR OUT THE JAMMING
AROUND THE BOBBIN. THREAD.
5. NEEDLE 1. NEEDLE IS HITTING THE SEE MECHANICAL P.28, 29
BREAKS NEEDLE PLATE. ADJUSTMENT “NEEDLE
POSITION.”
2. NEEDLE IS BENT OR WORN. CHANGE THE NEEDLE.
3. NEEDLE IS HITTING THE SEE MECHANICAL P.24
HOOK. ADJUSTMENT “NEEDLE
CLEARANCE TO HOOK.”
4. THE FABRIC MOVES WHILE SEE MECHANICAL P.14
THE NEEDLE IS PIERCING ADJUSTMENT “NEEDLE
IT, OR THE NEEDLE ZIGZAGS SWING.”
WHILE IN FABRIC.
5. FABRIC IS BEING PULLED TOO GUIDE THE FABRIC GENTLY
STRONGLY WHILE SEWING. WHILE SEWING.
THREAD
THREAD