Brother LZ2-B850W Service Manual

SINGLE NEEDLE ZIGZAG LOCK STITCHERSERVICE MANUALPlease read this manual before making any adjustments.LZ2-B850, B850WLZ2-B851

2. MECHANICAL DESCRIPTIONSLZ2-B850,B8512-022-3. Zigzag mechanism<B850,B850W><B851>2. Upper shaft3. Upper shaft gear9. Zigzag connecting ro

2. MECHANICAL DESCRIPTIONSLZ2-B850,B8512-032-4. Presser foot mechanism202020201098S1124S1. Adjustment screw2. Presser spring3. Presser bar4. Presser f

2. MECHANICAL DESCRIPTIONSLZ2-B850,B8512-042-5. Feed mechanism<Dial feed mechanism>●6. Feed rocker shaft●8. Feed bracket●7. Feed rocker bracket

2. MECHANICAL DESCRIPTIONSLZ2-B850,B8512-05< Back tack mechanism >3. Shaft4. Condense regulator(Touch the tip of screw)5. Tip of screw7. Feed re

2. MECHANICAL DESCRIPTIONSLZ2-B850,B8512-062-6. Lubrication●4. Needle barconnecting rod(Disperse oil)●3. Wick●5. FeltRotary hookRotary hook shaftLubri

2. MECHANICAL DESCRIPTIONSLZ2-B850,B8512-072-7. Tension release mechanism2. Lifter lever1a. Presser bar lifter1b. Connecting rod (When press the knee

3. DISASSEMBLYLZ2-B850,B8513-01Disassemble each part in order of the numbers.3-1. Cover3. DISASSEMBLYCAUTIONTurn off the power switch before disassemb

3. DISASSEMBLYLZ2-B850,B8513-023-2. Presser mechanism3-3. Needle bar mechanism20204. Adjustment screw5. Spring guide6. Spring7. Washer8. (Loosen)3. Ad

3. DISASSEMBLYLZ2-B850,B8513-033-4. Rotary hook mechanism3-5. Feed mechanism2. Two flat screws4. Two flat screws1. Slide plate3. Needle plate5. Auxili

4.ASSEMBLYLZ2-B850,B8514-01Install each part in order of the numbers.4-1. Feed mechanism4.ASSEMBLYLower shaft4. Feed rocker shaft (Slide left)(Pull ou

LZ2-B850, B851iThis service manual is intended for B850, B851; be sure to read the B850, B851 instruction manual before this manual.Carefully read the

4.ASSEMBLYLZ2-B850,B8514-024-2. Needle bar mechanism4. Joint1.Needle bar bracket assy3. Set screw(After "5-9. Adjusting the forward/back position

4.ASSEMBLYLZ2-B850,B8514-034-3. Rotary hook mechanism1. Needle5. Rotary hook holder6. **Screw (Temporarily tighten)2.8. ***Two screws (Temporarily tig

4.ASSEMBLYLZ2-B850,B8514-044-4. Presser mechanism20208. Adjustment screw7. Spring guide6. Spring5. Washer4. Screw (Temporarily tighten)Refer to below.

4.ASSEMBLYLZ2-B850,B8514-054-5. Cover2020Caution knife11. Flat screws (7 pcs)17. Thread take-upguard assy14. Thread take-upmounting plate16. Flat scre

5-015. ADJUSTMENTSLZ2-B850,B8515. ADJUSTMENTSCAUTIONMaintenance and inspection of the sewing machineshould only be carried out by qualified personnel.

5-025. ADJUSTMENTSLZ2-B850,B851ewrewHigest position Standard Lowest position0591M0592M0593M5-2. Adjusting the presser foot heightThe standard height o

5-035. ADJUSTMENTSLZ2-B850,B851rewqwerLower the frontStandardRaise the front(A)(B)qYYew(Front)0594M0596M0595MS48143S48143rq1004S1005SXX5-4. Adjusting

5-045. ADJUSTMENTSLZ2-B850,B851qweq2212.52212.54512345123Specification-1 (Max. stitch length 2.5mm)-3 (Max. stitch length 5mm)Scale position1.53Feed a

5-055. ADJUSTMENTSLZ2-B850,B8510-1-2-2.511049SuowerqBi0600M0599M<Backtacking and condensed stitches>The feed amount for backtacking and condense

5-065. ADJUSTMENTSLZ2-B850,B851ruwtqewA12A12C12C12For zigzag width 8mmB850W, B8511051S1050SFor zigzag width 5mmB850-10601M0602My5-8. Adjusting the nee

LZ2-B850, B851iiUse the sewing machine in an area which is freefrom sources of strong electrical noise such ashigh-frequency welders.Sources of strong

5-075. ADJUSTMENTSLZ2-B850,B8511014Sqqwe1047Sew1120Srt5-9. Adjusting the forward/back position of the needle bar* Make this adjustment if the needle b

5-085. ADJUSTMENTSLZ2-B850,B8511053Sq1052S1054SewerwCenterEquality5-10. Adjusting the right/left position of the needle barWith the change lever in th

5-095. ADJUSTMENTSLZ2-B850,B851qw0560M0-1-2-2.510-5mm 0-8mmwtyruoiw1055S1056S0-8mm0561M<B850> <B850W> <B851>Zigzag widtheq5-12. Adju

5-105. ADJUSTMENTSLZ2-B850,B8511061S1057SMax. 0.5mmqqqww<B850><B851>0563M 0564M 0562M0-1-2-2.510646MwrerLeftreferencelineRightreferencelin

5-115. ADJUSTMENTSLZ2-B850,B851<B850>qw1059Srteiuo!0!2!1y1058SZigzag width 0Centerreference lineZigzag width Max.Left (Right)reference lineZigza

5-125. ADJUSTMENTSLZ2-B850,B851qeqewA0-0.5mmwqeIndex mark Zigzag width ModelA 8mm B850W, B851C 5mm B850rtrruyr0-0.05mm0-0.05mm0603M0605M0606M0608MZigz

5-135. ADJUSTMENTSLZ2-B850,B851Be careful not to touch your fingers or the lubrication amount check sheet against moving parts such as therotary hook

5-145. ADJUSTMENTSLZ2-B850,B8511027SCaution knifee1029S1028Sqrrtewq5-18. Adjusting the lubrication amount of the needle barMake this adjustment if the

6. TROUBLESHOOTINGLZ2-B850,B8516-01q6. TROUBLESHOOTING• Please check the following points before calling for repairs or service.• If the following sug

6. TROUBLESHOOTINGLZ2-B850,B8516-02Lower thread0626M—5-02———5-015-015-055-065-12——Upper threadProblemPossible causePage5. Uneven seam• Is the presser

LZ2-B850, B851iii CAUTIONTurn off the power switch before carrying out clean-ing, otherwise the machine may operate if the treadleis depressed by mist

6. TROUBLESHOOTINGLZ2-B850,B8516-03————————5-015-065-12——80%ProblemPossible causePage8. Lower thread is tangled atthe sewing start.Lower thread• Is th

SERVICE MANUALPrinted in Japan118-M50I0120796F2000.12 (1)BROTHER INDUSTRIES, LTD.15-1, Naeshiro-cho, Mizuho-ku, Nagoya 467-8561, Japan. Phone: 81-52-

LZ2-B850, B851iv1Moving partsOperate with safety devices.Turn off main switch beforethreading, changing bobbin and needle, cleaning etc.may cause inju

LZ2-B850,B851CONTENTS1. MACHINE SPECIFICATIONS ...

LZ2-B850, B8511-011. MACHINE SPECIFICATIONSUseMaximum stitch lengthMax. zigzag widthMax. sewing speedThread take-up leverNeedle bar strokeFeed dog hei

LZ2-B850, B851 1-02<Motor pulley and V-belt>• Select the correct motor pulley and V-belt by referring to the table below to suit the power frequ

2. MECHANICAL DESCRIPTIONSLZ2-B850,B8512-01Operate in the order of the numbers in the illustration.The ● , and other symbols with the numbers indica