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Motorola LH4-B800E, HE-8000 I instruction manual Troubleshooting

Models: LH4-B800E HE-8000 HE-8000 I

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16. TROUBLESHOOTING

16. TROUBLESHOOTING

Problem

Upper thread breaks

Lower thread breaks

Skipped stitches

Poor thread tightening

Cause

Burrs in needle hole.

Needle is incorrectly installed.

Threading is incorrect.

Upper thread tension is too strong.

Thread is too thick for the needle hole.

Lower thread tension is too strong.

Bobbin case threading is incorrect.

Needle is incorrectly installed.

Threading is incorrect.

Needle and rotary hook timing is incorrect.

Clearance between Needle and rotary hook is too large.

Needle bar height is incorrect.

Lower thread tension is too strong.

Thread in bar tacking area is not tight.

Thread in zigzag sewing area is not tight.

Check

Needle

Needle position

Threading

Main and auxiliary tension

Needle and thread

Lower thread tension

Bobbin case threading

Needle position

Threading

Needle and rotary hook timing

Needle and rotary hook clearance

Needle bar height

Lower thread tension

Tension at tack tension

Tension at zigzag tension

Remedy	Page


Replace the needle.	57


Install the needle	57
correctly.	57

Thread the upper	58
thread correctly.	58

Adjust to an	61
appropriate tension.	61

Replace the needle with
one that is suitable for
the thread.

Adjust to an	61
appropriate tension.	61

Thread the bobbin	60
correctly to match the	60
sewing.

Install the needle	57
correctly.	57

Thread the upper	58
thread correctly.	58

Adjust the timing of the	72
needle and rotary hook.	72


Adjust the clearance	72
between the needle and	72
rotary hook.

Adjust the height of	71
the needle bar.	71

Adjust to an	61
appropriate tension.	61

Adjust the tack	61
tension.	61

Adjust the zigzag	61
tension.	61

Clearance between inner		Clearance between inner
rotary hook and rotary hook		rotary hook and rotary hook
holder is incorrect.		holder

Adjust the clearance be-	73
tween the inner rotary hook	73
and rotary hook holder.

HE-8000

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Image 98

Motorola LH4-B800E, HE-8000 I instruction manual Troubleshooting

Contents

LH4-B800E HE-8000 Safety Instructions Environmental requirements Sewing Moving parts may cause injury Contents Changing Functions Using Safety devices Name of Each PartHE-8000 SpecificationsSubclass Standard sewing pattern list Leg parts Optional PartsSpecial needle plate Standing operation pedalAuxiliary table Tape guardRuler Replacement parts set for 70 mm buttonhole length ProgrammerInstallation Power tableVertical positioning Installing the motor Installing the flange nutInstalling the control box Installing the power switch Installing the bed baseInstalling the machine head Installing the head restInstalling the operation panel Connecting the machine head harness Connecting the cordsConnecting the ground wire Connecting the motor harness Connect the connectors of the feed motor harnessConnecting the power cord Connecting the standing pedal harness option Table leg installation treadle support plates Installing the transformerFloor installation Installation underneath the work table Connecting the cordsInstalling the V-belt Adjusting the finger protector Installing the belt cover plateAdjusting the belt retainer Adjusting the treadle return pressure Installing the treadleAdjusting the treadle pressure Adjusting the treadle strokeInstalling the spool stand Installing the eye guard Lubrication Lubricating the bed baseLubricating the rotary hook Rotary hook lubrication adjustmentLubricating the arm Installing the belt cover Operation Part names and functionsProgram mode indicator Test feed mode indicatorManual mode indicator Select keyHome position return preparation Before starting home position returnOperating the treadle Three pedals Operating the standing pedal optionTwo pedals + kick pedal Parameter table Program setting methodProgram initialization condition Setting items Setting range Unit Default Zigzag width 3.0 mm Setting items Setting range Unit Default Front tack pitch except radial 05 1.00 mm Setting items Setting range Unit No. of stitches in X direction for saw-shaped rear Start backtack width 3.0 mm Saw-shaped underlays Saw-shaped underlay bar tack X stitch no Stitches Rear bar tack tension release timing Stitches Changing program details Bar tacking stitches being cut by the knife 13 17 2118Q 2123Q Rectangle Rear tack vector shape programsTriangle Saw-shapeSaw-shape underlay Underlay programsUnderlays sewn together Rectangle underlayCutter operation Center knife standard Rear knifeCycle program Changing the production counter Changing the lower thread counter setting value Program memo contents Using the program memosAdding patterns created using the BAS-PC/300 Adding patterns to a P-ROM→ 1 → 2 → 3 →….. → 90→ P1 → P2 → …… → P9 → 1 → 2 → …… Checking the Sewing Pattern 2136Q Installing the needle Correct USEThreading the upper thread Threading the thread at the sewing start positionAdjusting the bobbin winding amount Winding the lower threadWhip stitch plain stitch Threading the bobbin caseStitch patterns Purl stitch seal stitchThread tension Reference thread tension Thread take-up spring tensionThread take-up spring height Sewing SewingIf the emergency stop switch is pressed during sewing To finish sewing in this conditionIf the thread breaks during sewing Emergency stopThread breakage before sewing is finished To continue sewing from around the location of the breakageWhen resuming sewing in test feed mode or manual mode Lower thread counterMaintenance CleaningDraining the oil Cleaning the control box air inlet portCleaning the eye guard Cleaning the length feed plate Checking the needleStandard Adjustments Needle bar heightNeedle and hook timing adjustment Adjusting the clearance between needle and hook pointAdjusting the work clamp pressure Adjusting the knife installationAdjusting the upper thread trimming Scissors fully opening timing adjustment Adjusting the upper thread scissors opening timingGradual opening timing adjustment Adjusting the needle up stop position Adjusting the lower thread clamp timingAdjusting the bobbin presser Changing Functions Using the Memory Switches Memory switch table Initializing all programs Settings which are initializedProgram Initialization Initializing a single programChanging Functions Using the DIP Switches Panel DIP switchesPanel DIP switch table DipswaControl circuit board DIP switches DIP switch inside the control box table Gauge Parts List Needle plateFor flat cutter Work clamp assy, W/F-G Finger guard Gauge Parts List Cutter Error Code Table Like to keep the program which exceeds the area Troubleshooting TroubleshootingCause Needle is incorrectly installed 15-1, Naeshiro-cho, Mizuho-ku, Nagoya 467-8561, Japan. Phone