Janome MC7700 QCP, Service Manual

Page 1: ...SERVICE MANUAL PARTS LIST MC7700 QCP...

Page 2: ...NSION UNIT REPLACEMENT 17 THREAD TENSION MECHANISM 18 CIRCUIT BOARD F REPLACEMENT 19 CIRCUIT BOARD A REPLACEMENT 20 CONNECTOR DIAGRAM 21 NEEDLE THREADER PLATE REPLACEMENT 22 THREAD TENSION DRAWING LEV...

Page 3: ...D RAISE THE CARRYING HANDLE AND REMOVE THE TOP COVER TO ATTACH 2 FOLLOW THE ABOVE PROCEDURE IN REVERSE TO REMOVE 1 REMOVE THE SETSCREWS A 2 PCS TO REMOVE THE FACE PLATE TO ATTACH FOLLOW THE ABOVE PRO...

Page 4: ...RVICE ACCESS 2 BELT COVER TO REMOVE 1 REMOVE THE SETSCREW A LOOSEN THE SETSCREWS B AND C REMOVE THE BELT COVER TO ATTACH 2 FOLLOW THE ABOVE PROCEDURE IN REVERSE SETSCREW B SETSCREW A BELT COVER SETSCR...

Page 5: ...SETSCREWS B 4 PCS REMOVE THE BASE COVER TO ATTACH 2 FOLLOW THE ABOVE PROCEDURE IN REVERSE BED COVER TO REMOVE 1 REMOVE THE SETSCREWS C 2 PCS REMOVE THE BED COVER TO ATTACH 2 FOLLOW THE ABOVE PROCEDUR...

Page 6: ...THE HOOK A AND B FROM THE INSIDE REMOVE THE TAB A AND B FROM THE HOLES SLIDE THE FREE ARM COVER TO THE LEFT TO REMOVE THE FREE ARM COVER TO ATTACH 3 FOLLOW THE ABOVE PROCEDURE IN REVERSE THE HOOK B S...

Page 7: ...HE SETSCREWS A B C AND D UNLOCK THE REAR COVER HOOKS E FROM THE FRONT COVER REMOVE THE CONNECTORS FROM THE CIRCUIT BOARD A SEE PAGE 20 REMOVE THE FRONT COVER TO ATTACH 3 FOLLOW THE ABOVE PROCEDURE IN...

Page 8: ...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 TO ATTACH 3 FOLLOW THE ABOVE PROCEDURE IN REVERSE REAR COVER SE...

Page 9: ...HEXAGONAL SOCKET SCREW A ECCENTRIC PIN B THREADER LEVER FIG 1 1 OPEN THE FACE PLATE CHECK THE NEEDLE DROP POSITION ON THE STITCH PATTERN AND ZIGZAG STITCH WITH MAXIMUM WIDTH 2 LOOSEN THE HEXAGONAL SOC...

Page 10: ...G FOOT A ADJUST THE PRESSER FOOT PRESSURE DIAL TO 7 REMOVE THE TOP COVER SEE PAGE 1 2 RAISE THE PRESSER FOOT LIFTER 3 LOWER THE FEED DOG 4 REMOVE THE NEEDLE BAR SUPPORTER SPRING 5 REMOVE THE SETSCREW...

Page 11: ...ER 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 MAKE SURE THERE SHO...

Page 12: ...TSCREW GAP 0 3 mm WRONG CORRECT SETSCREW A THE BLOCK MOVES SMOOTHLY VIEW Y PRESSER BAR HEIGHT AND ALIGNMENT 3 WHEN THE PRESSER BAR IS LOWERED THE PRESSER FOOT SHOULD BE PARALLEL WITH THE SLOTS FOR THE...

Page 13: ...8 TURN THE LOWER SHAFT GEAR C UNTIL THE TIP OF THE HOOK MEETS THE RIGHT SIDE OF THE NEEDLE WHILE HOLDING THE HANDWHEEL 9 TIGHTEN THE HEXAGONAL SOCKET SCREW A AND B 10 ATTACH THE BOBBIN HOLDER NEEDLE P...

Page 14: ...HEXAGONAL SOCKET SCREW C BE CAREFUL NOT TO TURN THE NEEDLE BAR 7 ATTACH THE BOBBIN HOLDER NEEDLE PLATE AND TOP COVER 8 CLOSE THE FACE PLATE NEEDLE PLATE BOBBIN HOLDER TIP OF HOOK HOOK RACE NEEDLE SIZE...

Page 15: ...HE SETSCREWS E F AND G FIRMLY 7 CHECK THE BACKLASH BETWEEN THE HOOK DRIVE AND LOWER SHAFT GEARS SEE PAGE 14 FOR THE ADJUSTMENT 8 ATTACH THE BASE COVER BED COVER BOBBIN HOLDER NEEDLE PLATE AND PRESSER...

Page 16: ...TOO LITTLE TURN THE LOWER SHAFT BUSHING IN DIRECTION B 5 TIGHTEN THE HEXAGONAL SOCKET SCREW D 6 ATTACH THE NEEDLE NEEDLE PLATE AND BOBBIN HOLDER 7 ATTACH THE BASE COVER BACKLASH OF HOOK DRIVE AND LOW...

Page 17: ...IF THE FEED DOG IS NOT PARALLEL TO THE SURFACE OF THE NEEDLE PLATE AT ITS HIGHEST POSITION MAKE THE ADJUSTMENT AS FOLLOWS FOR THIS ADJUSTMENT A HEXAGONAL SOCKET SCREW 4 x 6 I PART NO 000111108 IS REQ...

Page 18: ...OF TO TIGHTEN THE TENSION TURN IT COUNTER CLOCKWISE IN THE DIRECTION OF THREAD TENSION DIAL THREAD TENSION ADJUSTING SCREW WHITE POLYESTER THREAD SIZE 50 UPPER THREAD TENSION THE UPPER THREAD TENSION...

Page 19: ...EMOVE 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 1...

Page 20: ...RN THE THREAD TENSION DIAL 9 TO 0 MAKE SURE THE TENSION DISKS DOES NOT MOVE 7 ATTACH THE TOP COVER CLOSE THE FACE PLATE AFTER THIS ADJUSTMENT CHECK THE THREAD TENSION SEE PAGE 16 MECHANICAL ADJUSTMENT...

Page 21: ...T BOARD F REPLACEMENT TO REMOVE 1 REMOVE THE FRONT COVER SEE PAGE 5 2 PULL OUT THE CONNECTOR FROM THE PRINTED CIRCUIT BOARD A SEE PAGE 21 3 REMOVE SETSCRWES A AND PRINTED CIRCUIT BOARD F TO ATTACH 4 F...

Page 22: ...HE 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 REVERSE THE ABOVE PROCEDURE SETSCREW SETSCREW SETSCRE...

Page 23: ...K PRINTED CIRCUIT BOARD L2 LEFT SIDE LAMP YELLOW BH SENSOR BLACK NEEDLE PLATE SWITCH RED LAMP L2 LAMP L1 SLIDE VOLUME PRINTED CIRCUIT BOARD F TOUCH PANEL CONNECTOR DIAGRAM REFER TO THIS DIAGRAM FOR LO...

Page 24: ...HEXAGONAL SOCKET SCREW F THREADER PLATE C THREADER POSITION SETTING PLATE G FIG II FIG III FIG I THREADER PLATE UNIT A PIN B NEEDLE BAR THREADER HOOK MECHANICAL ADJUSTMENT NEEDLE EYE ADJUST THE POSIT...

Page 25: ...BY MOVING THE THREAD DRAWING LEVER UP OR DOWN 3 TIGHTEN THE HEXAGONAL BOLT 4 ATTACH THE NEEDLE PLATE THREAD DRAWING LEVER 5 5 6 mm HEXAGONAL NUT HOOK RACE VIEW A VIEW A THREAD DRAWING LEVER THREAD DR...

Page 26: ...REAR ARM ARE PARALLEL ADJUSTMENT 6 SET THE UPPER FEED ADJUSTING DIAL TO 0 7 LOOSEN THE SETSCREW A SO THE CLEARANCE BETWEEN THE UPPER FEED LINK SHAFT AND UPPER FEED LOWER SHAFT SHOULD BE 2 5 mm UPPER...

Page 27: ...BE 4 mm ADJUSTMENT IF THE CLEARANCE BETWEEN THE DUAL FEED FOOT AND UPPER FEED DOG IS NOT 4 mm FOLLOW THE PROCEDURE BELOW 7 REMOVE THE TOP COVER 8 LOOSEN THE SETSCREWS A 9 ADJUST THE UPPER SHAFT REAR A...

Page 28: ...ITCH ON SELECT THE STITCH PATTERN 7 PRESS THE STITCH LENGTH ADJUSTING KEY SET THE STITCH LENGTH TO 0 TURN OFF THE POWER SWITCH 8 TURN THE HANDWHEEL TOWARD YOU COUNTERCLOCKWISE LOWER THE NEEDLE FROM IT...

Page 29: ...CTOR FROM THE CIRCUIT BOARD A 4 REMOVE THE 2 SETSCREWS A AND PULL OUT THE DRIVING MOTOR TO ATTACH 5 TIGHTEN THE 2 SETSCREWS A SLIGHTLY 6 ADJUST THE BELT TENSION AND TIGHTEN THE 2 SETSCREWS A FIRMLY WH...

Page 30: ...TURN THE HANDWHEEL TOWARD YOU TO RAISE THE NEEDLE AT 8 2 mm ABOVE THE SURFACE OF THE NEEDLE PLATE 3 REMOVE THE MACHINE BASE AND LOOSEN THE SETSCREW A OF THE LOWER SHAFT SHIELD PLATE TURN SHIELD PLATE...

Page 31: ...ON BY MOVING THE SENSOR PLATE IN THE DIRECTION OF ARROWS SO THAT THE M Line SENSOR SHOULD BE ON WHEN THE NEEDLE BAR IS AT 060 POSITION TIGHTEN THE SETSCREW BE CAREFUL NOT TO TOUCH THE SENSOR BOARD WIT...

Page 32: ...BUTTONHOLE LEVER C 4 LOOSEN THE SETSCREW A AND MOVE THE BUTTONHOLE LEVER GUIDE B UNTIL THE DISPLAY SHOWS L 5 ATTACH THE BUTTONHOLE FOOT R 6 ADJUST THE CLEARANCE OF THE BUTTONHOLE FOOT TO 1 6 mm D 7 LO...

Page 33: ...E PRESSER BAR IS AT EXTRA LIFTED POSITION THE ASSIST LIFT SHOWS UP WHEN THE PRESSER BAR IS AT NORMAL UP POSITION THE ASSIST LIFT SHOWS DOWN IF NOT LOOSEN THE SETSCREW A AND ADJUST THE POSITION OF THE...

Page 34: ...R IS INITIALIZED AND MOVING CUTTER MOVES TO ITS HOME POSITION AUTOMATICALLY 2 CHECK THE DISTANCE BETWEEN THE EDGE OF MOVING CUTTER AND THE END OF THREAD CUTTER PLATE SLIT ADJUSTMENT IF THE DISTANCE IS...

Page 35: ...OVER 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 3 PULL OUT THE CONNECTOR FROM THE SWITCHING POWER SUPPLY 4 OPEN THE CORD HO...

Page 36: ...ETSCREWS A TO CHECK 5 WHILE PRESSING THE NEEDLE UP DOWN AND LOCK STITCH BUTTONS TURN THE POWER SWITCH ON THE LCD SCREEN DISPLAY FACTORY ADJUST THEN ADJUSTING SCREEN WILL APPEAR TURN THE JOG DIAL TO SE...

Page 37: ...BALANCE DIAL C AT THE SETTING MARK D 3 SEW TEST PATTERNS AND CHECK THE MEASUREMENT OF FIVE OF THEM THE RANGE OF PATTERNS SHOULD BE IN THE RANGE OF 33 TO 39 MM 4 IF NOT REMOVE THE BASE LID E PRESS THE...

Page 38: ...DE THE DROP FEED LEVER TO THE RIGHT AWAY FROM YOU TO RAISE THE FEED DOG 3 SLIDE THE SPEED ADJUSTING LEVER TO THE LEFT 4 REMOVE THE PRESSER FOOT AND RAISE THE PRESSER BAR LIFTER AT NORMAL UP POSITION 5...

Page 39: ...ERED OFF 5 AUTOMATIC PLATE CONVERTER SWITCH Needle plate AUTOMATIC PLATE CONVERTER IS OPENED ON AUTOMATIC PLATE CONVERTER IS CLOSED OFF 6 BUTTONHOLE LEVER SWITCH BH Lever BUTTONHOLE LEVER IS AT BACK H...

Page 40: ...DOES NOT CHANGE OR INDICATES INCORRECT VALUE REMEDY REPLACE THE SLIDE VOLUME FOOT CONTROL PLUG CIRCUIT BOARD A STEP 5 THREAD TENSION RELEASE SOLENOID CORRECT CONDITION THREAD THE MACHINE NEEDLE THREAD...

Page 41: ...PHASES THE DISPLAY SHOWS ERROR REMEDY CHECK THE MOTORS IF THEY ROTATE SMOOTHLY REPLACE THE MOTOR REPLACE THE CIRCUIT BOARD A STEP 7 DC MOTOR LCD DISPLAYS DCM PRESS START STOP BUTTON OR DEPRESS FOOT C...