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Janome MC9900 User Manual

Janome MC9900
41 pages
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SERVICE MANUAL
&
PARTS LIST
MC9900

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Janome MC9900 Specifications

General IconGeneral
TypeComputerized Sewing and Embroidery Machine
Stitch OptionsYes
Maximum Stitch Width7 mm
Maximum Stitch Length5 mm
DisplayLCD Touchscreen
USB ConnectivityYes
Automatic Needle ThreaderYes
Weight26.5 lbs (12 kg)
Sewing SpeedUp to 1, 000 stitches per minute
Built-in Stitches200
Buttonholes10
LightingLED
Knee LifterYes
Presser FeetMultiple Included
Automatic Thread CutterYes
Built-in MemoryYes
Stitches200

Summary

Replacing Electronic Components

Printed Circuit Board A

Instructions for removing and installing the main circuit board A.

Switching Power Supply Unit

Guidance on replacing the unit that supplies power.

Driving Motor

Procedure for removing and installing the machine's driving motor.

Thread Tension Unit

Steps for replacing the thread tension assembly.

Mechanical Adjustment

Feed Dog Height

Adjusting the vertical position of the feed dogs for proper fabric movement.

Clearance Between Needle and Tip of the Rotary Hook

Setting the precise gap between the needle and hook tip.

Backlash Between Hook Drive Gear and Lower Shaft Gear

Adjusting gear play for smooth rotary hook operation.

Needle Drop Position

Calibrating the needle's lateral position during stitching.

Hook Timing

Synchronizing the rotary hook's rotation with the needle's movement.

Needle Bar Height

Adjusting the vertical travel distance of the needle bar.

Upper Thread Tension

Calibrating the tension applied to the upper thread.

Presser Bar Lifter Position

Adjusting the presser foot lifter for correct height and parallelism.

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