Janome MC7700 QCP Service Manual
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Janome MC7700 QCP Service Manual

Janome MC7700 QCP Service Manual

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SERVICE MANUAL
&
PARTS LIST
MC7700 QCP

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Summary of Contents for Janome MC7700 QCP

  • Page 1 SERVICE MANUAL & PARTS LIST MC7700 QCP...

  • Page 2: Table Of Contents

    INDEX INDEX INDEX INDEX INDEX SERVICE ACCESS FACE PLATE AND TOP COVER ......................1 BELT COVER ............................2 MACHINE BASE, BASE COVER AND BED COVER ................3 FREE-ARM COVER ..........................4 FRONT COVER ............................5 REAR COVER ............................6 MECHANICAL ADJUSTMENT NEEDLE DROP POSITION ........................

  • Page 3: Service Access

    SERVICE ACCESS (1) FACE PLATE SETSCREWS (A) [TO REMOVE] 1. REMOVE THE SETSCREWS (A) (2 PCS.) TO REMOVE THE FACE PLATE. [TO ATTACH] FOLLOW THE ABOVE PROCEDURE IN REVERSE. FACE PLATE CARRYING TOP COVER HANDLE SETSCREW (B) TOP COVER [TO REMOVE] 1.

  • Page 4: Belt Cover

    SERVICE ACCESS (2) BELT COVER [TO REMOVE] 1. REMOVE THE SETSCREW (A). SETSCREW (B) LOOSEN THE SETSCREWS (B) AND (C). REMOVE THE BELT COVER. [TO ATTACH] 2. FOLLOW THE ABOVE PROCEDURE IN REVERSE. SETSCREW (A) BELT COVER SETSCREW (C)

  • Page 5: Machine Base, Base Cover And Bed Cover

    SERVICE ACCESS (3) MACHINE BASE SETSCREW (A) MACHINE BASE SETSCREW (A) [TO REMOVE] 1. REMOVE THE SETSCREWS (A) (4 PCS.). REMOVE THE MACHINE BASE. [TO ATTACH] 2. FOLLOW THE ABOVE PROCEDURE IN REVERSE. SETSCREW (A) SETSCREW (A) BASE COVER SETSCREW (B) SETSCREW (B) BASE COVER [TO REMOVE]...

  • Page 6: Free-Arm Cover

    SERVICE ACCESS (4) FREE-ARM COVER [TO REMOVE] 1. REMOVE THE MACHINE BASE AND BED COVER (SEE PAGE 3). REMOVE THE NEEDLE PLATE. 2. REMOVE THE SETSCREW (A) AND PIN. HOOK (A) UNLOCK THE HOOK (A) AND (B) FROM THE INSIDE. REMOVE THE TAB (A) AND (B) FROM THE HOLES.

  • Page 7: Front Cover

    SERVICE ACCESS (5) SETSCREW (A) FRONT COVER [TO REMOVE] 1. REMOVE THE TOP COVER, MACHINE BASE, BASE COVER AND FREE-ARM COVER (SEE PAGES 1, 3 AND 4). 2. LOOSEN THE SETSCREWS (A), (B), (C), AND (D). UNLOCK THE REAR COVER HOOKS (E) FROM THE FRONT COVER.

  • Page 8: Rear Cover

    SERVICE ACCESS (6) REAR COVER [TO REMOVE] 1. REMOVE THE TOP COVER, MACHINE BASE, BASE COVER AND FREE-ARM COVER (SEE PAGES 1, 3 AND 4). 2. REMOVE THE SETSCREWS (A) (6 PCS.). UNLOCK THE REAR COVER HOOK FROM THE FRONT COVER. REMOVE THE REAR COVER.

  • Page 9: Mechanical Adjustment

    MECHANICAL ADJUSTMENT NEEDLE DROP POSITION WHEN THE STRAIGHT STITCH IS SELECTED, THE NEEDLE SHOULD BE AT THE CENTER OF THE HOLE OF THE NEEDLE PLATE. WHEN THE MAXIMUM ZIGZAG WIDTH (7.0) IS SELECTED, THE DISTANCE BETWEEN THE NEEDLE AND THE EDGE OF THE HOLE OF THE NEEDLE PLATE AT THE RIGHT AND LEFT NEEDLE POSITIONS SHOULD BE 0.2 mmOR MORE AS SHOWN IN FIG.

  • Page 10: Presser Bar Height And Alignment

    MECHANICAL ADJUSTMENT PRESSER BAR HEIGHT AND ALIGNMENT (1) WHEN THE PRESSER FOOT IS LIFTED, THE DISTANCE BETWEEN THE SURFACE OF THE NEEDLE PLATE AND THE BOTTOM OF THE ZIGZAG FOOT SHOULD BE 6 MM. 1. ATTACH THE ZIGZAG FOOT A. ADJUST THE PRESSER FOOT PRESSURE DIAL TO “7”.
  • Page 11 MECHANICAL ADJUSTMENT PRESSER BAR PRESSER BAR HEIGHT AND ALIGNMENT (2) SUPPORTER 8 PLACE THE BLOCK (A) (6.6 mm) BETWEEN THE SETSCREW (H) PRESSER FOOT AND NEEDLE PLATE. (THE PRESSER FOOT LIFTER SHOULD BE AT THE NORMAL UP POSITION) 9 LOOSEN THE SETSCREW (H) ON THE PRESSER BAR SUPPORTER WHILE THE PRESSER FOOT HOLDING THE BLOCK (A).
  • Page 12 MECHANICAL ADJUSTMENT PRESSER BAR HEIGHT AND ALIGNMENT (3) WHEN THE PRESSER BAR IS LOWERED, THE PRESSER FOOT SHOULD BE PARALLEL WITH THE SLOTS FOR THE FEED DOGS. 1. LOOSEN THE SETSCREW ON THE ROTATION STOPPER WHILE THE PRESSER FOOT HOLDING ROTATION STOPPER THE BLOCK (A) (SEE PAGE 9 FOR THE BLOCK SETSCREW...

  • Page 13: Hook Timing

    MECHANICAL ADJUSTMENT HOOK TIMING THE AMOUNT OF ASCENDING TRAVEL OF THE NEEDLE BAR FROM ITS LOWEST POSITION TO THE POSITION WHERE THE TIP OF THE ROTARY HOOK EXACTLY MEETS THE RIGHT SIDE OF THE NEEDLE SHOULD BE 3.50 TO 3.75 mm. 1.

  • Page 14: Needle Bar Height

    MECHANICAL ADJUSTMENT NEEDLE BAR HEIGHT BEFORE PROCEEDING WITH THIS ADJUSTMENT, CHECK THE HOOK TIMING (SEE PAGE 11). THE DISTANCE BETWEEN THE UPPER EDGE OF THE NEEDLE EYE AND THE TIP OF THE HOOK SHOULD BE IN THE RANGE OF 1.4 –1.75 mm WHEN THE TIP OF THE HOOK MEETS RIGHT SIDE OF THE NEEDLE IN THE LEFT NEEDLE POSITION ( ) AS THE NEEDLE ASCENDS FROM ITS LOWEST POSITION.

  • Page 15: Clearance Between Needle And Rotary Hook

    MECHANICAL ADJUSTMENT CLEARANCE BETWEEN NEEDLE AND ROTARY HOOK THE CLEARANCE BETWEEN NEEDLE AND THE TIP OF THE ROTARY HOOK (J) SHOULD BE BETWEEN –0.1 AND +0.05 MM [ADJUSTMENT I] 1. REMOVE THE TOP COVER (SEE PAGE 1) AND PRESSER FOOT PRESSURE DIAL. ATTACH MASTER NEEDLE (I).

  • Page 16: Backlash Of Hook And Lower Shaft Gears

    MECHANICAL ADJUSTMENT BACKLASH OF HOOK DRIVE AND LOWER SHAFT GEARS THE GEARS TURNS SMOOTHLY AND ROTARY PLAY OF THE HOOK SHOULD BE 0.8 mm OR LESS WHEN THE TIP OF HOOK (E) IS WITHIN THE WIDTH OF THE FEED DOG (C) AS SHOWN BELOW. 1.

  • Page 17: Feed Dog Height

    MECHANICAL ADJUSTMENT FEED DOG HEIGHT WHEN THE PRESSURE ADJUSTING DIAL IS AT “7” AND THE PRESSER FOOT (A) IS LOWERED, THE HIGHEST POSITION OF THE FEED DOG SHOULD BE 0.80 TO 0.90 mm FROM THE SURFACE OF THE NEEDLE PLATE. [ADJUSTMENT I] 1.

  • Page 18: Upper Thread Tension

    MECHANICAL ADJUSTMENT UPPER THREAD TENSION THE UPPER THREAD TENSION SHOULD BE 75–90 GRAMS WHEN PULLING THE THREAD (WHILE POLYESTER THREAD SIZE 50) AT THE SPEED OF 110 MM/SEC WITH THE TENSION DIAL AT “AUTO” (MAKE SURE THE FOOT IS LOWERED.) 1.

  • Page 19: Thread Tension Unit Replacement

    MECHANICAL ADJUSTMENT THREAD TENSION UNIT REPLACEMENT SETSCREW (A) [TO REMOVE] 1. OPEN THE FACE COVER. REMOVE THE TOP COVER. 2. REMOVE SETSCREW (A) AND (B). REMOVE THE THREAD TENSION UNIT. [TO ATTACH] 3. REVERSE THE PROCEDURE ABOVE. CHECK THE THREAD TENSION (SEE PAGE 16). ADJUST THE THREAD TENSION MECHANISM (SEE PAGE 18).

  • Page 20: Thread Tension Mechanism

    MECHANICAL ADJUSTMENT THREAD TENSION MECHANISM ADJUSTMENT WHEN THE PRESSER FOOT LIFTER IS RAISED, THE TENSION DISKS SHOULD OPEN APPROXIMATELY 1.0 MM. WHEN THE PRESSER FOOT IS LOWERED, THE TENSION DISKS SHOULD CLOSE AND THE TENSION RELEASE PLATE (2) SHOULD BE FREE FROM TENSION. 1.

  • Page 21: Circuit Board "F" Replacement

    MECHANICAL ADJUSTMENT PRINTED CIRCUIT BOARD “F” REPLACEMENT [TO REMOVE] 1. REMOVE THE FRONT COVER (SEE PAGE 5). SETSCREW (A) 2. PULL OUT THE CONNECTOR FROM THE PRINTED CIRCUIT BOARD A (SEE PAGE 21). 3. REMOVE SETSCRWES (A) AND PRINTED CIRCUIT BOARD F.

  • Page 22: Circuit Board "A" Replacement

    MECHANICAL ADJUSTMENT CONNECTORS SETSCREW CIRCUIT BOARD “A” REPLACEMENT [TO REMOVE] 1. REMOVE THE FRONT COVER (SEE PAGE 5). 2. REMOVE THE CONNECTORS (5 PCS) FROM THE CIRCUIT BOARD A. REMOVE THE SETSCREWS (3 PCS). REMOVE THE CIRCUIT BOARD A. [TO ATTACH] 3.

  • Page 23: Connector Diagram

    CONNECTOR DIAGRAM REFER TO THIS DIAGRAM FOR LOCATING THE CONNECTOR POSTS TO WHICH EACH CONNECTORS SHOULD BE CONNECTED. TO DISCONNECT THE CONNECTORS: 1. GRASP THE CONNECTOR DIRECTLY WITH YOUR FINGERS AND PULL. DO NOT PULL THE LEAD WIRE, AS THIS MAY DAMAGE THE CONTACT SLEEVE INSIDE THE CONNECTOR. TO CONNECT THE CONNECTORS: 1.

  • Page 24: Needle Threader Plate Replacement

    MECHANICAL ADJUSTMENT NEEDLE THREADER PLATE REPLACEMENT [TO REMOVE] 1. REMOVE THE FOOT HOLDER. (FIG.I) 2. PULL OUT THE THREADER PLATE UNIT (A). PIN (B) [TO ATTACH] THREADER PLATE 3. PUSH THE THREADER PLATE UNIT (A) UP TO UNIT (A) SNAP IT WITH THE PIN (B) AS SHOWN IN FIG. I. 4.

  • Page 25: Thread Tension Drawing Lever

    MECHANICAL ADJUSTMENT THREAD DRAWING LEVER ADJUSTMENT THE STANDARD HEIGHT OF THE THREAD DRAWING LEVER FROM THE SURFACE OF BOBBIN HOLDER SHOULD BE THE RANGE OF 5.5 TO 6.0 mm. THREAD DRAWING LEVER 1. REMOVE THE NEEDLE PLATE. LOOSEN THE HEXAGONAL NUT. 2.

  • Page 26: Upper Feed Dog Adjustment (1)

    MECHANICAL ADJUSTMENT UPPER FEED DOG ADJUSTMENT (1) THE CLEARANCE BETWEEN THE UPPER FEED LINK SHAFT AND UPPER FEED LOWER SHAFT SHOULD BE 2.5 mm WHEN ADJUSTING THE DUAL FEED BALANCING DIAL TO “0”. [TO CHECK] DUAL FEED BALANCING DIAL 1. TURN THE POWER ON. SELECT THE STITCH ( 2.
  • Page 27 MECHANICAL ADJUSTMENT UPPER FEED DOG ADJUSTMENT (2) THE CLEARANCE BETWEEN THE DUAL FEED FOOT AND UPPER FEED DOG. THE CLEARANCE SHOULD BE 4 mm. [TO CHECK] DUAL FEED BALANCING DIAL 1. ATTACH THE DUAL FEED FOOT. 2. SET THE UPPER FEED DOG. TURN THE POWER SWITCH ON.

  • Page 28: Upper Feed Dog Height

    MECHANICAL ADJUSTMENT UPPER FEED DOG HEIGHT ADJUSTMENT THE CLEARANCE BETWEEN THE LOWER 1. REMOVE THE FACE PLATE AND TOP COVER. EDGE OF THE NEEDLE EYE AND THE UPPER SURFACE OF THE NEEDLE 2. REMOVE THE FRONT BRACKET (UNIT) AND PLATE SHOULD BE 0.9 mm. NEEDLE BAR SUPPORTER SPRING (SEE PAGE 8).

  • Page 29: Driving Motor

    TO REPLACE DRIVING MOTOR DRIVING MOTOR REPLACEMENT [TO REMOVE] 1. REMOVE THE FRONT COVER AND BELT COVER. (SEE PAGE 2 AND 5) 2. REMOVE THE MOTOR BELT. 3. PULL OUT THE CONNECTOR FROM THE CIRCUIT BOARD A. 4. REMOVE THE 2 SETSCREWS (A) AND PULL OUT MOTOR BELT THE DRIVING MOTOR.

  • Page 30: Upper Shaft Shield Plate Position

    MECHANICAL ADJUSTMENT LOWER SHAFT SHIELD PLATE POSITION ADJUSTMENT WHEN THE MACHINE IS SET FOR ZIGZAG STITCH, THE NEEDLE SHOULD START TO SWING 7.7 TO 8.7 mm ABOVE THE SURFACE OF THE NEEDLE PLATE. 1 WHILE PRESSING THE NEEDLE UP/DOWN AND LOCK STITCH BUTTONS, TURN THE POWER SWITCH ON.

  • Page 31: Center Needle Position Adjustment

    MECHANICAL ADJUSTMENT CENTER NEEDLE POSITION SENSOR ADJUSTMENT THE CENTER NEEDLE POSITION SENSOR WILL BE “ON” WHEN THE NEEDLE BAR IS AT CENTERED POSITION (INITIALIZED). [TO CHECK] 1. WHILE PRESSING THE NEEDLE UP/DOWN AND LOCK STITCH BUTTONS, TURN THE POWER SWITCH ON. THE LCD SCREEN WILL DISPLAY “FACTORY ADJUST”.

  • Page 32: Buttonhole Lever Position

    MECHANICAL ADJUSTMENT BH LEVER SENSOR BUTTONHOLE LEVER POSITION ADJUSTMENT 1. WHILE PRESSING THE NEEDLE UP/DOWN AND LOCK STITCH BUTTONS, TURN THE POWER SWITCH ON. THE LCD SCREEN WILL DISPLAY “FACTORY ADJUST”. 2. TURN THE JOG DIAL TO SELECT “06. Sensor”. PRESS THE CONFIRM BUTTON.

  • Page 33: Presser Bar Lifter Switch Position

    MECHANICAL ADJUSTMENT PRESSER FOOT LIFTER SWITCH EXTRA LIFTED POSITION PRESSER BAR LIFTER SWITCH POSITION NORMAL UP ADJUSTMENT POSITION 1. WHILE PRESSING THE NEEDLE UP/DOWN AND LOCK STITCH BUTTONS, TURN THE POWER SWITCH ON. LOWERED POSITION 2. TURN THE JOG DIAL TO SELECT “06. Sensor”. PRESS THE CONFIRM BUTTON.

  • Page 34: Thread Cutter Sensor Position

    MECHANICAL ADJUSTMENT THREAD CUTTER SENSOR POSITION ADJUSTMENT WHEN THE THREAD CUTTER MOTOR IS INITIALIZED, THE DISTANCE BETWEEN THE EDGE OF MOVING CUTTER AND THE END OF THREAD CUTTER PLATE SLIT SHOULD BE IN THE RANGE OF 0.4 TO 1.2 mm. [TO CHECK] 1.

  • Page 35: Switching Power Supply Replacement

    MECHANICAL ADJUSTMENT SWITCHING POWER SUPPLY REPLACEMENT [TO REMOVE] CORD HOLDER SETSCREW CONNECTOR 1. REMOVE THE TOP COVER, FRONT COVER, REAR COVER, BELT COVER AND FREE-ARM COVER. (SEE PAGE 1, 2, 5 AND 6) 2. PULL OUT THE POWER SWITCH CONNECTOR (WHITE) FROM THE CIRCUIT BOARD A.

  • Page 36: Solenoid Position

    MECHANICAL ADJUSTMENT SOLENOID POSITION ADJUSTMENT WHEN THE TENSION DISK IS CLOSED, THE CLEARANCE BETWEEN THE PLUNGER AND THE END OF YOKE SHOULD BE 2.0 mm. TOP VIEW [ADJUSTMENT] 1. REMOVE THE TOP COVER (SEE PAGE 1) 2. LOOSEN THE SETSCREWS A. 3.

  • Page 37: Stretch Stitch Feed Balance

    MECHANICAL ADJUSTMENT ADJUSTMENT OF STRETCH STITCH FEED BALANCE ADJUST THE STRETCH STITCH BALANCE DIAL (C) AT THE SETTING MARK (D). THE MEASUREMENT OF FIVE OF TEST PATTRENS SHOULD BE IN THE RANGE OF 33 TO 39 mm AS SHOWN IN FIG.

  • Page 38: Diagnosis Test

    DIAGNOSIS TEST NOTE: 1. THE POWER SWITCH MUST BE TURNED OFF WHEN REPLACING PARTS. 2. THE LANGUAGE ON THE LCD IS ENGLISH ONLY. PREPARATION 1. SHIFT THE BOBBIN WINDER SPINDLE TO THE RIGHT. 2. SLIDE THE DROP FEED LEVER TO THE RIGHT (AWAY FROM YOU) TO RAISE THE FEED DOG. 3.
  • Page 39 STEP 1 (LCD DISPLAY) [FAULTY CONDITION] [CORRECT CONDITION] THE STEP 1 SCREEN DOES NOT 1) LCD DISPLAY AND LED BLINK AT 1 SECOND INTERVAL. APPEAR. LCD OR LED DOES NOT BLINK. 2) SEWING LIGHT TURNS ON. –REMEDY– PRESS THE REVERSE STITCH REPLACE CIRCUIT BOARDS BUTTON TO PROCEED TO THE NEXT STEP.
  • Page 40 STEP 4 (SPEED CONTROL LEVER AND FOOT CONTROL) SLIDE VOLUME [FAULTY CONDITION] [CORRECT CONDITION] THE DISPLAY DOES NOT CHANGE MOVE THE SPEED CONTROL OR INDICATES INCORRECT VALUE. LEVER SLOWLY. THE DISPLAY SHOWS WHEN THE LEVER IS: –REMEDY– AT THE LEFT END: 000-008 REPLACE THE SLIDE VOLUME, AT THE RIGHT END:...
  • Page 41 STEP 6 (PHASE CHECK) [FAULTY CONDITION] MOTORS WILL NOT BE 1) TURN THE HANDWHEEL TOWARD INITIALIZED WHEN CONFIRM YOU. THE “Phase state” CHANGES BUTTON IS PRESSED AT BM OR “BM”, “–”, “FM” AND “–” IN ORDER. FM PHASES. “--” to “BM” THE DISPLAY SHOWS ERROR.

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