Brother LH4-B800E Service Manual

SERVICE MANUALELECTRONIC LOCKSTITCH BUTTON HOLERPlease read this manual before making any adjustments.LH4-B800E

LH4-B800E1 - 31. MECHANISM DESCRIPTION1-3. Needle zigzag mechanism1. The operation of the pulse motor q is transmitted as reciprocal motion to the zig

LH4-B800E4 - 134. Adjustmentreqwtrew1 mmreqwreqwrw1 mm4-13-1. Adjusting the longitudinal feed arm assembly position4-13-2. Adjusting the trimmer drivi

LH4-B800E4 - 144. AdjustmentewwqeeqrApprox. 1 mmAligned4-13-3. Adjusting the lateral position of the upper thread scissors at the sewing start1. Turn

LH4-B800E4 - 154. Adjustmentuytqewreq4-13-5. Adjusting the cutting depth of the upper thread scissorsClearance 0--0.5 mmCam1. Turn off the power (with

LH4-B800E4 - 164. Adjustment1 mmtryqwewq1 mmuuCam4-13-6. Adjusting the installation height of the upper thread scissors1. Turn off the power (with the

LH4-B800E4 - 174. Adjustment0.5 mm0.5 mm0.5 mm0.5 mmrrewqqw(A)(B)(B)(a)0.5 mm(a)(b)(b)(A)(C)4-13-7. Adjusting the upper thread scissors gradual openin

LH4-B800E4 - 184. Adjustmentrrewqwqtetweuy(A) 5.5 - 6 mmoi4-13-8. Adjusting the upper thread scissors opening timingApprox. 2 mmApprox. 1—1.5 mmApprox

LH4-B800E4 - 194. Adjustment(A)(B)rewq1 mmeyty(A)(B)eqw(A)(B)ew1 - 2 mm4-14. Adjusting the lower thread trimming4-14-1. Adjusting the lower thread tri

LH4-B800E4 - 204. Adjustmentttrreewqqw6 - 7 mmt4-14-3. Adjusting the lower thread clamp opening timingReference line ASewing start Lower thread winds

LH4-B800E4 - 214. Adjustmentytr* After moving the lower thread trimmer cam lever y back in the direction of the arrow, move the feed mechanism.If the

LH4-B800E4 - 224. Adjustmenttreqwy4-14-4. Adjusting the lower thread clamp opening amount1. Loosen the screws q, and then adjust so that the distance

LH4-B800E1 - 41. MECHANISM DESCRIPTION1-4. Presser foot lifter mechanism1. When the pulse motor q operates, the gear w that is installed to the pulse

LH4-B800E4 - 234. AdjustmentttrrewqyAuTurn on the power and set the sewing machine to the home position. Then press the RESET key to lower the presser

LH4-B800E4 - 244. Adjustment2 mmreqw(A)yter(B)1 mm1 mm0.1 - 0.5 mmewe!0oiu4-16. Adjusting the thread breakage detectorTouchingSection (A)Section (B)1.

LH4-B800E4 - 254. Adjustmentewqw0.1 - 0.3 mm0.3 - 0.5 mmwq4-17. Adjusting the thread tension at the tack tension controlTurn on the power and set the

LH4-B800E4 - 264. AdjustmentwqrewqwwwF = 98 N (10 kgf)t4-19. Adjusting the upper thread feeding amount1. Loosen the screw q, and then turn the tension

LH4-B800E4 - 274. AdjustmentAF = 98 N (10 kgf)wqrewqe4-21. Adjusting the upper shaft timing belt1. Loosen the screws q, and then use a spring gauge to

LH4-B800E4 - 284. Adjustmenttrewqywq10 - 14 mm4-23. Adjusting the needle up stop position1. The needle up stop position is adjusted so that the index

LH4-B800E5 - 15. Troubleshooting guideCause Check Solution pageNeedle Needle facing Reattach needleproperlyAs viewed from the direction of theface pla

LH4-B800E5 - 25. Troubleshooting guideCause Check Solution pageThread take-up springThread take-up springtension and strokeAdjust thread take-upspring

LH4-B800E5 - 35. Troubleshooting guideCause Check Solution pageNeedle Needle facing Refer to "5-1. Needle thread breakage"Needle installatio

LH4-B800E5 - 45. Troubleshooting guideCause Check Solution pageUpper threadscissorsInstallation height Install the upper threadscissors at the correct

LH4-B800E1 - 51. MECHANISM DESCRIPTION1-5. Feed mechanism1. A timing belt r is attached to pulley A w that is secured to the pulse motor q and to pull

LH4-B800E5 - 55. Troubleshooting guideCause Check Solution pageLower threadretainerLower thread retainingamountAdjust the lower threadretaining amount

LH4-B800E5 - 65. Troubleshooting guide5-4. Uneven seams 2)...Around rear tack or front tack63 64 65 665-5. Uneven seams 3)...Loose thread end at

LH4-B800E5 - 75. Troubleshooting guide5-7. Uneven seams 5)...All stitches(B)(A)Stopper should notprotrude from innerrotary hook.Cause Check Solutio

LH4-B800E5 - 85. Troubleshooting guideCause Check Solution pageUpper threadtrimmerassemblyUpper thread trimmerassembly positionMove the setting platea

LH4-B800E5 - 95. Troubleshooting guideCause Check Solution pageRotary hook Needle height whenrotary hook pointaligned with needlecenter(Needle bar hei

LH4-B800E5 - 105. Troubleshooting guide5-9. Unraveling of thread trimmed by upper thread trimmer assembly5-10. Needle thread mis-trimmingCheck burr on

LH4-B800E5 - 115. Troubleshooting guideCause Check Solution pageUpper threadtrimmerassemblyUpper thread trimmerassembly positionRefer to "5-8. Ne

LH4-B800E5 - 125. Troubleshooting guide5-12. Needle breakageBisect0.3 mmO.K.NGCheck the chamfered sidefinishing(Needle plate cross section)Cause Check

LH4-B800E5 - 135. Troubleshooting guide5-13. (1)Imperfect cutter function (imperfect material cutting)(2) Cutter does not return(3) Cutter and upper t

LH4-B800E5 - 145. Troubleshooting guideCause Check Solution pageUpper threadscissorsScissors installationheightRefer to "5-3. Uneven seams 1)&quo

LH4-B800E1 - 61. MECHANISM DESCRIPTION1-6. Cutter mechanism1. When a cutter ON signal is input, the cutter solenoid q operates.2. A cutter link bracke

LH4-B800E5 - 155. Troubleshooting guide5-15. Folding clamp is not raised (1) Pulse motor stepping sound cannot be heardCause Check Solution pagePresse

LH4-B800E5 - 165. Troubleshooting guideCause Check Solution pageMachinestoppingpositionRotary hook toucheslower thread retainer atthe stop positionAdj

LH4-B800E5 - 175. Troubleshooting guideCause Check Solution pageFeed pulsemotorCord connection Check the cordconnections andcontacts.-Upper threadscis

LH4-B800E5 - 185. Troubleshooting guide5-18. Needle does not zigzag or noise occurs when needle zigzags5-19. Sewing machine stops during sewingCause C

LH4-B800E 6 - 16. ELECTRIC MECHANISM6. ELECTRIC MECHANISM6-1. Precautions at the time of adjustmentPay attention to the following when opening the con

LH4-B800E6 - 26. ELECTRIC MECHANISM6-2. Components inside the control box and the operation panelThe following are brief explanations of components in

LH4-B800E 6 - 36. ELECTRIC MECHANISM6-3. Fuse explanationIf a component on a PCB is damaged, a fuse may blow again immediately even when it has been r

LH4-B800E6 - 46. ELECTRIC MECHANISM6-4. ConnectorsMost of the machine trouble is due to connector problems including improper connection or insufficie

LH4-B800E 6 - 56. ELECTRIC MECHANISM1-step power supply circuit boardPanel PCB2-step power supply circuit boardCN1CN2CN3CN4CN5CN6P1POWERP3PERP4ACINP1P

LH4-B800E6 - 66. ELECTRIC MECHANISMCircuit board connectors<Main circuit board>P1 [FAN2]Pin No. Signal name Symptoms resulting mainly from poor

LH4-B800E1 - 71. MECHANISM DESCRIPTION1-7. Thread breakage detection mechanism1. The cutter bar fixed plate assembly q and the thread guide w are secu

LH4-B800E 6 - 76. ELECTRIC MECHANISMP6 [POWER]Pin No. Signal name Symptoms resulting mainly from poor contact1 P8V (+8V) The panel power lamp does not

LH4-B800E6 - 86. ELECTRIC MECHANISMP10 [HEAD]Pin No. Signal name Symptoms resulting mainly from poor contact1 Emergency stop NC signal The emergency s

LH4-B800E 6 - 96. ELECTRIC MECHANISMP14 [AC18V]Pin No. Signal name Symptoms resulting mainly from poor contact1 AC18V (+D10V) The zigzag home position

LH4-B800E6 - 106. ELECTRIC MECHANISMP16 [NPM]Pin No. Signal name Symptoms resulting mainly from poor contact1 Zigzag PM driving current A The zigzag h

LH4-B800E 6 - 116. ELECTRIC MECHANISMP22 [EXPAND1]Pin No. Signal name Symptoms resulting mainly from poor contact1 +5V The zigzag home position, feed

LH4-B800E6 - 126. ELECTRIC MECHANISMP23 [EXPAND2]Pin No. Signal name Symptoms resulting mainly from poor contact1 Input signal spare 1 The zigzag home

LH4-B800E 6 - 136. ELECTRIC MECHANISM<Sub circuit board>P1 [EXP1]Pin No. Signal name Symptoms resulting mainly from poor contact1 +5V The zigzag

LH4-B800E6 - 146. ELECTRIC MECHANISMP2 [FDPM]Pin No. Signal name Symptoms resulting mainly from poor contact1 Feed PM driving current A The feed home

LH4-B800E 6 - 156. ELECTRIC MECHANISMP6 [POWER]Pin No. Signal name Symptoms resulting mainly from poor contact1 +55V (PM) The feed home position and p

LH4-B800E6 - 166. ELECTRIC MECHANISMP9 [OPSEN1]Pin No. Signal name Symptoms resulting mainly from poor contact1 +24V Special edition2 +5V3 Input signa

LH4-B800E1 - 81. MECHANISM DESCRIPTION1-8. Lubrication mechanism1. The plunger pump w that is attached to the lower shaft q draws oil up (A) through t

LH4-B800E 6 - 176. ELECTRIC MECHANISMP13 [EXP2]Pin No. Signal name Symptoms resulting mainly from poor contact1 Input signal spare 1 The zigzag home p

LH4-B800E6 - 186. ELECTRIC MECHANISM<1-step power supply circuit board>CN1Pin No. Signal name Symptoms resulting mainly from poor contact1 P8V (

LH4-B800E 6 - 196. ELECTRIC MECHANISMCN5Pin No. Signal name Symptoms resulting mainly from poor contact1 DC300V The zigzag home position can not be fo

LH4-B800E6 - 206. ELECTRIC MECHANISM<2-step power supply circuit board>P1 [POWER]Pin No. Signal name Symptoms resulting mainly from poor contact

LH4-B800E 6 - 216. ELECTRIC MECHANISM<Panel PCB>P1 [PANEL]Pin No. Signal name Symptoms resulting mainly from poor contact1 +5V The panel does no

LH4-B800E6 - 226. ELECTRIC MECHANISM6-5. Description of DIP switches6-5-1. Panel DIP switchesAB1. Slide the panel side cover to open it.2. Change the

LH4-B800E 6 - 236. ELECTRIC MECHANISMSetting itemWork clamp size: 7.3 × 75 mm (6.0 × 70 mm)Work clamp size: 7.3 × 36 mm (6.0 × 32 mm)Work clamp size:

LH4-B800E6 - 246. ELECTRIC MECHANISM6-5-2. Control circuit board DIP switcheswqeWait at least 5 minutes after turning off the power switch and disconn

LH4-B800E 6 - 256. ELECTRIC MECHANISMDIPSW2DefaultOFFOFFOFFOFF, OFFOFF/ONOFFOFF1234, 5678ONOFFONOFFONOFFON, ONON, OFFOFF, ONOFF, OFFONOFFONOFFONOFFSet

LH4-B800E6 - 266. ELECTRIC MECHANISM6-6. Description of machine motor parameters* To change the machine motor parameters, press and hold the ENTER key

LH4-B800E1 - 91. MECHANISM DESCRIPTION1-8-1. Lower shaft and rotary hook lubrication1. The oil which is drawn up by the wick q is supplied to the lowe

LH4-B800E 6 - 276. ELECTRIC MECHANISMWait at least 5 minutes after turning off the power switch and disconnecting the power cordfrom the wall outlet b

LH4-B800E6 - 286. ELECTRIC MECHANISMSewing data errorNeedle up error during operationNeedle down error during operationTiming signal error during oper

LH4-B800E 6 - 296. ELECTRIC MECHANISM6-8. TroubleshootingCode CountermeasureE-001. Turn off emergency stop switch.2. Check if connector P10 on the mai

LH4-B800E6 - 306. ELECTRIC MECHANISMCode CountermeasureE-07<If E-07 occurs other than when machine is moving to the home position or starting>1.

LH4-B800E 6 - 316. ELECTRIC MECHANISMCode CountermeasureE-421. Clean the exhaust cooling fan. (Remove dust.)2. Check if connectors P1 and P20 on the m

LH4-B800E6 - 326. ELECTRIC MECHANISMCode CountermeasureE-62<Software>1. If the sewing machine stops before the needle up position, reduce the se

LH4-B800E 6 - 336. ELECTRIC MECHANISMCode CountermeasureE-95E-961. Check the power supply voltage in the workplace and the power supply voltage specif

LH4-B800E 6 - 346. ELECTRIC MECHANISM6-9. Control circuit block diagram POWERP6B10P-VH10MP0V9MP0VP0VM55V8M55V7SOV65E24V4P0V3+55V2+55V1 PERP3 VALVP4Gre

SERVICE MANUALPrinted in Japan118-H80I1050811H2001.07. H (1)BROTHER INDUSTRIES, LTD.15-1, Naeshiro-cho, Mizuho-ku, Nagoya 467-8561, Japan. Phone: 81-

LH4-B800E1 - 101. MECHANISM DESCRIPTION01423014231-9. Tension release mechanism1. When a thread tension ON signal is input, the tension release soleno

LH4-B800E1 - 111. MECHANISM DESCRIPTION01423014231. When the pulse motor q operates, the gear w that is installed to the pulse motor shaft engages wit

LH4-B800E1 - 121. MECHANISM DESCRIPTION1-10. Upper thread trimmer mechanism(1)(2)(3)(4)(5)(6)(7)(8)Upper thread trimmer mechanism operating sequence(5

iLH4-B800E... This symbol ( ) indicates something that you should be careful of. The picture inside the triangle indi-cates the natur

LH4-B800E1 - 131. MECHANISM DESCRIPTION1. When the pulse motor q operates, the gear w that is installed to the pulse motor shaft engages with the pres

LH4-B800E1 - 141. MECHANISM DESCRIPTION1. An opening cam e is attached to the opening cam bracket w that is secured to the feed arm q (Figure A). Afte

LH4-B800E1 - 151. MECHANISM DESCRIPTION3. Then, when the feed mechanism moves forward, the cam w that is secured to the feed arm q moves in thedirecti

LH4-B800E1 - 161. MECHANISM DESCRIPTION1. When the pulse motor q operates, the gear w that is installed to the pulse motor shaft engages with the pres

LH4-B800E1 - 171. MECHANISM DESCRIPTION5. The lower thread trimmer cam connecting rod q is connected to lower thread trimmer link A w, so that themove

LH4-B800E1 - 181. MECHANISM DESCRIPTION11. When feed guide shaft B q that is secured to the feed arm support moves forward after sewing starts, the ro

LH4-B800E2 - 12. DISASSEMBLY2. DISASSEMBLYRemove the two screws q, and then remove the cover w.Loosen the set screw e, and then remove the set screw c

LH4-B800E2 - 22. DISASSEMBLY2-2. Lower thread trimmer assemblyRemove the screw q, and then remove the feed presser plate w.Remove the bolt e and the w

LH4-B800E2 - 32. DISASSEMBLYRemove the plate spring q.Remove the shoulder screw w, and then remove the opening plate assembly e.Remove the shoulder sc

LH4-B800E2 - 42. DISASSEMBLYRemove the screw q and the plain washer w, and then remove the cord holder e and the cord support u.Disconnect the cords f

LH4-B800Eii All cords should be secured at least 25 mm away fromany moving parts. Furthermore, do not excessivelybend the cords or secure them too fir

LH4-B800E2 - 52. DISASSEMBLYttrrewqoiuyFor long-hole specifications (-5)Remove feed guide shaft B-5 (for long-hole) q.Remove feed guide shaft A-5 (for

LH4-B800E2 - 62. DISASSEMBLYtrreq!0oiuywr!5!4!3!2!2!1!6!0!9!8!7@2@3@4Remove the two screws q, and then remove the feed arm support w and the opening c

LH4-B800E2 - 72. DISASSEMBLYRemove the two extension springs q.Remove the shoulder screw w, and then remove the opening plate e from the rotary hook c

LH4-B800E2 - 82. DISASSEMBLYLoosen the screw q.Remove the tension stud bracket assembly w and the tension release pin e.Remove the shoulder screw r.Re

LH4-B800E2 - 92. DISASSEMBLYRemove the shoulder screw q, and then remove the tension release lever w and the spring e.Remove the tension stud assembly

LH4-B800E2 - 102. DISASSEMBLY2-6. Presser lifter mechanismRemove the two screws q, and then remove the clamp sensor dog w from the upper thread trimme

LH4-B800E2 - 112. DISASSEMBLYRemove the bolt q, and then remove the pulse motor N assembly (for needle zigzag) w and the pulse motor FTassembly (for p

LH4-B800E2 - 122. DISASSEMBLYLoosen the eye bolt w, and then remove lifter shaft A q.Remove the shoulder screw r, and then remove the ball bearing t a

LH4-B800E2 - 132. DISASSEMBLYRemove the screw q, and then remove the zigzag sensor plate w from the motor bracket e.Loosen the set screw r, and then r

LH4-B800E2 - 142. DISASSEMBLY2-8. Cutter mechanismRemove the screw q, and then remove the cutter w from cutter holder DL e.Remove the screw r, and the

iiiLH4-B800EThis sewing machine should only be used by opera-tors who have received the necessary training in safeuse beforehand. The sewing machine s

LH4-B800E2 - 152. DISASSEMBLYtr!0oiy!1t!5!4!7!6!6w@0!9@2@3@5@6@1@6@7@8@4wLoosen the bolt y.Take out the solenoid plunger from the cutter solenoid w.Re

LH4-B800E2 - 162. DISASSEMBLYLoosen the screw q, and then remove the pulley assembly w.Remove the screw e, and then remove the synchronizer assembly H

LH4-B800E2 - 172. DISASSEMBLY2-10. Needle bar and thread take-up mechanismRemove the set screw w and nut e from the arm.Remove the screw r, and then r

LH4-B800E2 - 182. DISASSEMBLYRemove the set screw q, and then remove the support shaft w.Remove the wick e.Loosen the two set screws r.Remove the thre

LH4-B800E2 - 192. DISASSEMBLYLoosen the presser adjusting nut q.Remove the presser adjusting screw w, and then remove the spring guide e, compression

LH4-B800E2 - 202. DISASSEMBLY2-12. Upper thread trimmer mechanismRemove the screw q, spring washer w and plain washer e, and then remove the upper thr

LH4-B800E2 - 212. DISASSEMBLYRemove the two springs q from the upper thread trimmer lever set w.Remove the eye bolt e, and then remove the trimmer dri

LH4-B800E2 - 222. DISASSEMBLYRemove the screw q, and then remove the lever stopper w.Remove the screw e, and then remove the lever stopper r.Remove th

LH4-B800E2 - 232. DISASSEMBLYRemove the screw q, and then remove tube support U w.Remove the wicks e and r, and then disconnect the oil tube t.Remove

LH4-B800E2 - 242. DISASSEMBLYNeedle zigzag mechanismRemove the screw q, and then remove the felt support w from the motor bracket e.Remove the screw r

LH4-B800EivHazardous voltagewill cause injury.Turn off main switch and wait 5 minutes before opening this cover.Un voltage non adaptéprovoque des bles

LH4-B800E2 - 252. DISASSEMBLYOil tubesRemove the fastening band q.Remove the screw w, and then remove tube support M e.Disconnect the oil tube r that

LH4-B800E2 - 262. DISASSEMBLYRemove the screw q, and then remove the cap w and the felt @5.Remove the screw o, and then remove felt base A r from the

LH4-B800E2 - 272. DISASSEMBLYRemove the three screws q, and then remove the oil filter bracket w from the bed.Remove the oil tube e that is connected

LH4-B800E2 - 282. DISASSEMBLYRemove the spring q and the screw w, and then remove the rubber presser e from the bed.Remove the wick r from the felt su

LH4-B800E2 - 292. DISASSEMBLYRemove the two screws q, and then remove the rotary hook holder w.Loosen the set screw e, and then remove the rotary hook

LH4-B800E2 - 302. DISASSEMBLY

LH4-B800E3 - 13. ASSEMBLY3. ASSEMBLYAfter attaching the timing belt to the idle pulley assembly q, insert the collar w. Insert the shaft e, and then i

LH4-B800E3 - 23. ASSEMBLYInsert the roller shaft q into the lower thread trimmer cam lever w, and secure it by tightening the nut e. Place the roller

LH4-B800E3 - 33. ASSEMBLYInstall the screw q to the base plate w. Install the lever assembly e and the lower thread retainer r to the base platew with

LH4-B800E3 - 43. ASSEMBLYInstall the two feed shaft linear bushes q to the bed. Secure the ball bearing stopper w with the screw e. Place the linear b

LH4-B800ECONTENTS1. MECHANISM DESCRIPTION ... 1-11-1. Needle take-up mechanism ...

LH4-B800E3 - 53. ASSEMBLYFor long-hole (-5) specificationsInsert the linear bush 9.53 (for long-hole) q into the feed arm support -5 (for long-hole) w

LH4-B800E3 - 63. ASSEMBLYProvisionally install the length feed plate q to the feed arm support r with the two eye bolts w and the two springwashers e.

LH4-B800E3 - 73. ASSEMBLYInstall spring hook U q to the bobbin presser bracket w. Install the screw e and the nut r to the bobbin presserbracket w. At

LH4-B800E3 - 83. ASSEMBLYInstall the tension release solenoid q to the solenoid holder e with the two screws w.Pass the tension release solenoid link

LH4-B800E3 - 93. ASSEMBLYConnect the adjusting lever q, lever link w and tension take-up lever e with the two shoulder screws r. Install thelever t to

LH4-B800E3 - 103. ASSEMBLY3-6. Presser lifter mechanismApply grease to @3@3@4@2@3!9Apply grease@1Apply grease to !8@0!8@5@6Apply grease to @5Apply gre

LH4-B800E3 - 113. ASSEMBLYInstall the motor lever w to the pulse motor N assembly (for needle zigzag) q with the set screw e so that thedimensions are

LH4-B800E3 - 123. ASSEMBLYInsert the two linear ball bearings !0 into the guide bracket !1.Provisionally install the bearing holder !2 with the bolt !

LH4-B800E3 - 133. ASSEMBLYPass the zigzag connecting rod shaft q through the zigzag lever w and zigzag connecting rod e, and then secure itby tighteni

LH4-B800E3 - 143. ASSEMBLYPass the cutter driving arm shaft q through the set screw collar w and the cutter driving arm assembly e in the direction sh

LH4-B800E4. ADJUSTMENT ...4-14-1. Adjusting the ne

LH4-B800E3 - 153. ASSEMBLYInsert the cutter driving shaft q into the arm from the top, and then pass it through the holes in the felt w and thedriving

LH4-B800E3 - 163. ASSEMBLYTighten the screw @2 so that the distance between the needle bar @6 and the cutter @3 is 0.3 mm.Tighten the screw @4 so that

LH4-B800E3 - 173. ASSEMBLYInstall the two retaining rings q to the upper shaft w. Press-fit the ball bearing e as far as the retaining rings q.(Upper

LH4-B800E3 - 183. ASSEMBLYInstall the crank rod guide q with the two bolts w and the screw e.Install the needle bar bracket slide block r to the threa

LH4-B800E3 - 193. ASSEMBLYInsert the needle bar w into the needle bar bracket assembly q, and then pass it through the needle bar clamp e as shown in

LH4-B800E3 - 203. ASSEMBLYInstall the presser bar lifter link q to the presser bar guide bracket e with the shoulder screw w. Install the set screw r

LH4-B800E3 - 213. ASSEMBLYInsert the upper thread trimmer fulcrum shaft q into the arm. Secure the upper thread trimmer fulcrum shaft q with the set s

LH4-B800E3 - 223. ASSEMBLYInstall the upper thread trimmer assembly q to the upper thread trimmer lever w with the screw r, spring washer tand plain w

LH4-B800E3 - 233. ASSEMBLYProvisionally install the thread guide w to the thread breakage perceiving shaft q with the plain washer e, plainwasher r an

LH4-B800E3 - 243. ASSEMBLYInsert the wick q into bush F w. Insert the felt e to stop the wick q from coming out.At this time, push in firmly so that t

LH4-B800E1 - 11. MECHANISM DESCRIPTION1. MECHANISM DESCRIPTION1-1. Needle take-up mechanism1. When the machine pulley q is turned in the direction of

LH4-B800E3 - 253. ASSEMBLYteqwreqwPass the wick q through tube support U w and push it firmly into the upper shaft lubrication hole. Pass the wick eth

LH4-B800E3 - 263. ASSEMBLYNeedle zigzag mechanismPass the oil tube q through tube support U w and the tube support e, and secure it with the screw r.I

LH4-B800E3 - 273. ASSEMBLYOil tubesInsert the felt q into the arm, and then insert it into the hole in the thread take-up lever cover w.Install the fe

LH4-B800E3 - 283. ASSEMBLYPass the wick e through the collar q, and then insert it into the oil terminal w so that it protrudes by approximately 5mm.

LH4-B800E3 - 293. ASSEMBLYCheck that the notches (A) of the plungers q and the lower shaft w are aligned, and then insert the two plungers qand the tw

LH4-B800E3 - 303. ASSEMBLYPass the wick q through the collar w as shown in the illustration.Place the collar w onto the bush e as far as the base of t

LH4-B800E3 - 313. ASSEMBLYInstall the rotary hook joint assembly q to the lower shaft, and then secure it by tightening the set screw w. Tightenthe se

LH4-B800E3 - 323. ASSEMBLY

LH4-B800E4 - 14. Adjustmentqwre(a)(b)tyr(c)4. ADJUSTMENT[When turning on the power to make adjustments]1. Turn on the power and set the sewing machine

LH4-B800E4 - 24. Adjustmentq18.52 mmwtreuy4-1. Adjusting the needle zigzag home position sensor positionReference valueNeedle barPresser barNeedle mov

LH4-B800E1 - 21. MECHANISM DESCRIPTION1-2. Upper shaft, lower shaft and rotary hook mechanism1. When the machine pulley q is turned in the direction o

LH4-B800E4 - 34. Adjustment(1.5)rewqqw2 mm4-2. Adjusting the feed home position sensor position1. Turn on the power and set the sewing machine to the

LH4-B800E4 - 44. Adjustmentrewqqw[-5 specifications (long-hole specifications)]1. Turn on the power and set the sewing machine to the home position. T

LH4-B800E4 - 54. Adjustmentrewq(A)qty4-3. Adjusting the presser foot home position sensor positionApprox. 1 mm1. Turn on the power.* Do not set the se

LH4-B800E4 - 64. Adjustmenttrewqtrewqiuy0.01 - 0.08 mmo0.3 mmO.K.NG4-4. Adjusting the needle bar heightNeedle barCutterTurn on the power and set the s

LH4-B800E4 - 74. Adjustment2-2113.5+0.1016+0.102-3112.7+0.1016.2+0.102805-2114.2+0.1016.7+0.103.2 mm2.5 mmqewr0.01 - 0.08 mmAdjusting the clearance be

LH4-B800E4 - 84. Adjustment10ewqAAwqweq10 mm4-6. Adjusting the inner rotary hook and rotary hook holder overlap1. Loosen the screw e to adjust so that

LH4-B800E4 - 94. Adjustmentewqrreqqw4.5 0.5 mm4-9. Adjusting the work clamp lateral position1. Loosen the set screw q, and then move the feed arm w

LH4-B800E4 - 104. AdjustmentXYtrewqiuy0.3 mmwPush4-11. Adjusting the knife installation position(Fig. A)(Fig. B)Pulled forwardKnife grooveCutterTouchi

LH4-B800E4 - 114. Adjustmentqeqw1.5 - 2 mmwThe special needle plate has a narrow cutter groove of 0.3—0.4 mm, so use the accessory positioning plate q

LH4-B800E4 - 124. AdjustmentUpper thread trimming adjustment procedureAdjusting the presser foot homeposition sensor position 4-3(1) (1)Adjusting the