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Janome MC8900 QCP User Manual

Janome MC8900 QCP
39 pages
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SERVICE MANUAL
&
PARTS LIST
MC8900 QCP
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Janome MC8900 QCP Specifications

General IconGeneral
TypeComputerized Sewing Machine
Stitch Options200
Stitch Count200
Maximum Stitch Width9 mm
Maximum Stitch Length5 mm
Buttonhole Styles11
Needle Positions91
DisplayLCD
Free ArmYes
Automatic Thread CutterYes
Weight24.3 lbs (11 kg)
Speed Control SliderYes
Start/Stop ButtonYes
Needle Up/DownYes
LightingLED
Knee LifterYes
Needle ThreaderYes
LCD ScreenYes
Built-in MemoryYes
USB PortYes
Maximum Sewing Speed1000 spm

Summary

Changing External Parts

Face Cover

Procedure to remove and attach the face cover.

Top Cover

Procedure to remove and attach the top cover.

Belt Cover

Procedure to remove and attach the belt cover.

Machine Base

Procedure to remove and attach the machine base.

Base Cover

Procedure to remove and attach the base cover.

Bed Cover

Procedure to remove and attach the bed cover.

Free Arm Cover

Procedure to remove and attach the free arm cover.

Front Cover

Procedure to remove and attach the front cover.

Rear Cover

Procedure to remove and attach the rear cover.

Replacing Electronic Components

Printed Circuit Board A

Procedure to remove and attach printed circuit board A.

Printed Circuit Board F

Procedure to remove and attach printed circuit board F.

Switching Power Supply Unit

Procedure to remove and attach the switching power supply unit.

Driving Motor

Procedure to remove and attach the driving motor.

Thread Tension Unit

Procedure to remove and attach the thread tension unit.

Mechanical Adjustment

Feed Dog Height

Adjusting the feed dog height to specific measurements.

Needle Drop Position

Adjusting the needle drop position for straight stitch.

Presser Bar Height

Adjusting the presser bar height and parallelism.

Hook Timing

Adjusting the rotary hook timing relative to the needle.

Needle Bar Height

Adjusting the needle bar height relative to the hook race.

Clearance Between Needle and Tip of Rotary Hook

Adjusting clearance between needle and rotary hook tip.

Clearance Between Needle and Tip of Rotary Hook (Adjustment 2)

Further adjustment for needle-hook tip clearance.

Presser Bar Lifter Switch Position Adjustment

Adjusting the presser bar lifter switch position.

Backlash Between Hook Drive Gear and Lower Shaft Gear

Adjusting backlash between hook drive and lower shaft gears.

Upper Shaft Shield Plate Position

Adjusting the upper shaft shield plate position for zigzag.

Upper Thread Tension

Adjusting the upper thread tension to specification.

Needle Threader Plate

Procedure to remove, attach, or adjust the needle threader plate.

Thread Drawing Lever

Adjusting the height of the thread drawing lever.

Upper Feed Dog (1)

Adjusting clearance for the upper feed link shaft.

Upper Feed Dog (2)

Adjusting clearance between dual feed foot and upper feed dog.

Upper Feed Dog (3)

Adjusting needle height relative to dual feed foot.

Buttonhole Lever Adjustment

Adjusting the buttonhole lever for proper function.

Buttonhole Lever Adjustment (Sensor and Guide)

Adjusting buttonhole sensor position and guide.

Thread Cutter

Adjusting the distance of the thread cutter.

Solenoid Position Adjustment

Adjusting the solenoid plunger and yoke clearance.

Stretch Stitch Feed Balance

Adjusting stretch stitch feed balance for pattern measurement.

Needle Plate Switch

Adjusting the needle plate sensor switch position.

Needle Plate Switch Check

Checking needle plate attachment and switch status.

Diagnosis Test

Step 1 (LCD Display)

Checking the LCD display and LED indicators.

Step 2 (Function of Buttons)

Checking the function of control buttons.

Step 3 (Detecting Switch)

Checking various switches and their states.

Step 4 (Speed Control Lever and Foot Control)

Checking speed control lever and foot control values.

Step 5 (Thread Tension Release Solenoid)

Checking the thread tension release solenoid.

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