Confidence 7463 69 34466f

Confidence

7463 7465 7467 7469

Service Manual

104 72 89-26

16 Oct 2007

INDEX Sec. 1 Disassembling of covers - - - - - - - - - - - - - - - - - - - - - - 4-9 Sec. 2 Test mode - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 10-12 Sec. 3 Adjustment of feed dog height - - - - - - - - - - - - - - - - - - 13 Sec.

4

Needle bar height - - - - - - - - - - - - - - - - - - - - - - - - - - - 14

Sec.

5

Needle threader height - - - - - - - - - - - - - - - - - - - - - - - 15-16

Sec.

6

Presser foot height and direction - - - - - - - - - - - - - - - - 17

Sec. 7 Needle position at zigzag stitching - - - - - - - - - - - - - - - 18 Sec. 8 Clearance between needle and shuttle - - - - - - - - - - - - 19-20 Sec.

9

Needle timing to feed dog - - - - - - - - - - - - - - - - - - - - - 21

Sec.

10

Needle timing to shuttle hook - - - - - - - - - - - - - - - - - - 22

Sec.

11

Needle stopper at right position - - - - - - - - - - - - - - - - 23

Sec.

12

Adjustment of thread tension - - - - - - - - - - - - - - - - - - 24

Sec. 13

Zigzag bight & stitch balance - -- - - - - - - - - - - - - - - - - 25-38

Sec.

14

Needle stops at heighest position - - - - - - - - - - - - - - - 39

Sec.

15

Bobbin holder stopper spring- - - - - - - - - - - - - - - - - - 40-41

Sec.

16

Motor belt tension- - - - - - - - - - - - - - - - - - - - - - - - - - 42

Sec.

17

Timing belt tension- - - - - - - - - - - - - - - - - - - - - - - - - 43

Sec.

18

Bobbin holder thread tension- - - - - - - - - - - - - - - - - - 44

-2-

Sec.

19

Electrical parts area AC power board - - - - - - - - - - - - - - - - - - - - - - - - - - - - 45 U board - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -46-48 Switch board - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 49-53 Wiring harness - - - - - - - - - - - - - - - - - - - - - - - - - - - - -54-56

-3-

Sec.1 (1)

Disassembling of covers

Face cover side

Remove screw A.

A

Remove screw Ｂ.

B

(2) Back cover side

Remove two self-tapping screws.

D

E

-4-

Remove two screws F & G.

F

G

Remove screw H.

H

Loosen screw J with washer.

J

K

Remove screw K on bottom side.

-5-

Remove screw L on bottom side.

L

Remove needle plate by loosening two screws.

Push up front cove to open inserting Small screw driver between front and back covers.

Open back and front covers.

-6-

Pull out front cover.

Open mating portion of front and back covers using small screw driver.

Push back cover by small screw driver. 40mm

Force front cover open by small screw driver.

-7-

Lift up front cover as illustrated.

Lift up front cover as illustrated.

Lower presser foot lever to remove back cover easily.

-8-

Disassembling of covers for model 7422 An additional bottom cover is provided on model 7422. Remove screws S for front cover and then 5 screws on the bottom cover.

Bottom cover S

Disassembling of covers for model 7424・7426・7428

*7436

An additional bottom cover is provided on model 7424, 7426 ,*7436 and 7428. Remove screws S for front cover and then 6 screws on the bottom cover.

Bottom cover

S

-9-

Sec.2 Test mode 1. Push bobbin winder to the right

2. Push and hold reverse switch in place.

3. Turn on power switch.

4. Release bobbin winder while pushing reverse switch, just after power switch is turned on.

5. LED is lit at the top left corner.

7422, 7442,

7424, 7444,

7462

7464 and others

- 10 -

Note: Above operation is to be done in the following manner.

Steps 1 to 3

Steps 4 to 5

Release bobbin winder by the time when LED is lit at extreme right line.

- 11 -

Test mode; Mode 1: In case of model 7422, 7442 and 7462, push switch at top right corner after machine is under test mode as described above, and pattern LED will be lit at top left corner. In case of other models, push pattern switch at top left corner after machine is under test mode and the switch will be lit. Needle shifts from left to center to right position repeatedly with foot control depressed. Stitch length is set at “0”.

Mode 2:

In case of model 7422, 7442 and 7462, push switch at second row after machine is under test mode and pattern LED will be lit at extreme left position. In case of other models, push pattern switch at second position from left and the switch will be lit. Needle moves at center position with foot control depressed. Stitch length is set at “0”.

Mode 3:

In case of model 7422, 7442 and 7462, push switch at third row after machine is under test mode and pattern LED will be lit at extreme left position. In case of other models, push pattern switch at third position from left and the switch will be lit. Machine sews 11 stitches in forward with length at 2 mm and then same number of stitches in reverse with length at 2 mm and stops automatically. Needle position is set at center position.

- 12 -

Sec. 3

Adjustment of feed dog height

Checking: 1. Move feed dog to its highest position by turning hand wheel. Check to see if feed dog height is as illustrated below.

0.9 – 1.0 mm

Adjustment: 1. Remove needle plate. Loosen nut with wrench.

2. Adjust height by turning screw as illustrated. Tighten nut securely after adjustment..

- 13 -

Sec. 4

Needle bar height

Note: Make this checking before checking “Needle timing to shuttle” Checking: 1. Remove needle plate and bobbin case. Select straight stitch (center needle position). Raise needle to its highest position by turning hand wheel. 2. Check to see if distance from needle point to the surface of needle plate is as illustrated below.

Highest position

Needle position

of Needle

at center

15.5 to 16 mm from the surface of needle plate

Adjustment: 1. Remove face cover. 2. Loosen screw (A) of needle bar clamp using hex screw driver and adjust the height of needle bar.

A

B

3. Check to see if needle threader operates correctly and there is not interference in vertical movement of needle bar. Tighten screw (A) securely after adjustment.

- 14 -

Sec.5 Needle threader height Checking: 1. Select straight stitch at center needle position. 2. Raise needle to its highest position by rotating hand wheel towards you. 3. Lowering needle threader lever (A), check and see if hook is inserted into the needle hole.

E

C

D

A

B

Adjustment: 1. Remove face cover 2. Turning hand wheel by hand, bring needle bar to its highest position. 3. Loosen of threader stopper screw(B) 4. Insert hook into the upper side of needle-hole moving the needle bar (C). 5. While holding above situation, tighten the screw attaching the threader stopper

onto stopper

pin (D). 6. The direction of threader stopper should be facing toward you as the threader stopper (E) may hit the .

Added : November, 2006

- 15 -

＊Insert the hook into the upper side of needle hole at all times as the smaller needle size, the shorter needle hole. #14

#11

#9

Insert the hook into the upper side of needle hole.

Hook

7. If the direction of insert hook is deviated from right position. ・Adjust the hook position with the attached small screw driver.

Needle hole

Hook

8. Recheck that the needle threader works correctly. Added: November 2006

- 16 -

Sec. 6 Presser foot height and direction

5.6 mm

Checking: 1. Lower the feed dog below the needle plate. 2. Raise the presser foot lever. 3. Check and see if clearance between the needle plate and the presser foot is about 5.6mm.

Adjustment: 1. Remove the face cover, and Raise the presser foot lever. 2. Loosen the screw (A) and adjust the presser foot height moving the presser bar. 3. Tighten the screw securely after checking the presser foot is parallel with the needle plate. A

A

Added : November, 2006

- 17 -

Sec. 7 Needle position at zigzag stitching Checking: 1. Set test mode at 1. 2. Turn hand wheel by hand and see if needle leaves the same clearance at both right and left end of needle plate hole.

a＝b a

b

Adjustment: 1. Loosen hex screw (A) and adjust needle position by turning eccentric pin using 7mm wrench.

A

- 18 -

Sec. 8 Clearance between needle and shuttle Note: Make this checking before checking “Needle timing to shuttle”

Checking: 1. Remove needle plate, bobbin case and face cover. 2. Set test mode at 1. 3. Shift shuttle hook at the rear of needle by turning hand wheel. Check to see if needle clearance to shuttle is within 0.05 to 0.15 mm. 0.05～0.15ｍｍ

0.05～0.15ｍｍ

At right position

At left position

Shuttle 0.05～0.15ｍｍ

At left position

At right position

Adjustment: 1. Turn screw to either direction as illustrated and adjust needle position by moving shaft back and forth. To decrease clearance, turn screw to counter-clockwise.

- 19 -

2. If needle clearance to shuttle at right and left position is not same, adjust position of fulcrum for needle swing . Loosen bolt located under bottom of plate and adjust position of fulcrum.

Do not loosen this screw.

3. After adjustment, tighten the bolt securely.

- 20 -

Sec. 9

Needle timing to feed dog

Note: After adjustment, be sure to follow “Needle timing to shuttle”. Checking: 1. Turning hand wheel, bring needle bar to it’s highest position. 2. Check to see if feed dog starts to move when needle starts to go down by turning hand wheel towards you.

Feed dog starts to move almost at the same time when needle starts to go down.

Adjustment: 1. Adjust the angle of timing gear to lower shaft with 2 screws on timing gear loosened and hex driver inserted into one of the screws by turning main shaft with hand wheel,. If feed-dog motion too early

→

Turn hand wheel towards you.

If feed-dog motion too late

→

Turn hand wheel away from you.

2. Tighten screw temporarily and check feed-dog motion.

- 21 -

Sec. 10

Needle timing to shuttle hook

Check “Needle timing to feed dog” and “Needle bar height” beforehand.

Checking: 1. Set mode at 1. 2. Remove needle plate. Check to see if needle is not bent. 3. Move needle to left position by turning hand wheel. Raise needle from its lowest position slowly and check if distance is as illustrated below, when point of shuttle hook aligns with right side of needle. Point of shuttle hook

0.5～0.8ｍｍ

Adjustment: 1. Remove front cover. Loosen two screws on gear and adjust position of gear as illustrated below. With one screw tightened temporarily, check to see if the clearance is as illustrated above.

2. Adjust it by turning main shaft with hand wheel, with screws loosened and hex driver inserted into one of the screws. Tighten screws securely after adjustment.

- 22 -

Sec. 11 Needle stopper at right position Note: Before checking, follow section “Needle position at zigzag stitching“ Checking: 1. Set test mode at 1. Remove face cover. 2. Bring needle to right position. 3. With needle bar touched with stopper at right side, check to see if needle collides with presser foot and needle plate. It is acceptable if needle goes down along the edge of needle plate.

Stopper

Adjustment: 1. Loosen screw (A) and adjust the stopper in either direction. Tighten the screw securely after adjustment.

A

- 23 -

Sec. 12

Adjustment of thread tension

Checking: 1. Set thread tension at the center of “AUTO” position. 2. Pull thread between tension discs and check thread tension value using 100 gr. tension gauge. Measured value should be 40 to 50 g. *When tension gauge is not available, do actual sewing and check balance of upper and lower threads.

Adjustment: 1. Remove front cover and adjust by turning spring pressure adjustment screw. *Turn it clockwise to increase tension. *Turn it counter-clockwise to decrease tension.

When making adjustment without removing front cover, 1. Remove face cover and lower thread take-up lever. 2. Insert index finger and adjust by turning spring pressure adjustment screw as shown below.

Revised: January 2006

- 24 -

Sec.13

Zigzag bight & stitch balance

Zigzag bight 1. Checking meshing position of gears This procedure is needed only when disassembling and re-assembling cams. (1) Checking Remove face cover and turn off power switch. Rotate gear (a) clockwise until it stops with long projection touched with shaft. Check to see if end (c) of zigzag cam (b) aligns with center of gear (a).

a

c

b

(2) Disassembling and re-assembling If meshing position of two gears is not correct, remove zigzag cam (b) from shaft and insert it into correct position.

2. Origin point positioning of zigzag bight (1) Checking---Meshing position of gears is to be correct. Set machine at test mode 1. Move needle to its right position by turning hand wheel. Turn off power switch Turn gear (a) further clockwise and check to see carefully if it may rotate, since rotation amount is very limited. Turn clockwise.

Long

projection

concealed inside

- 25 -

*Setting is OK if there is a room for long projection (concealed) of gear (a) to rotate. *Setting is not good if the projection has collided with zigzag cam and doesn’t move. 2. Adjustment Turn off power switch. Loosen two screws on gear (a) and tighten the screw near short projection temporarily. Screw to be tightened temporarily.

Turn on power switch. Loosen the screw tightened temporarily on gear (a) and rotate gear (a) clockwise until it touches with limiter and tighten two screws securely.

Stitch balance If forward and reverse pitch is not balanced due to imperfect zero feed adjustment, adjust by changing position of motor gear.

Stepping motor for stitch length

Screw on motor gear

Adjustment In case of small deviation from correct zero feed, adjust as follows: *It is recommended to use SINGER test needle when checking Zero feed. 1. Turn off power switch. 2. Loosen one of two screws on motor gear.

- 26 -

3. Set machine at test mode 2

[Zero feed］.

4.

Loosen other screw on motor gear for adjustment.

5.

Adjust by moving the motor gear in either direction with 1.5 mm hex driver running machine with a little thick paper placed under presser foot.

Fine adjustment is needed for all patterns including buttonholes on models with many stitch patterns except model 7422, 7442 and 7462. Fine adjustment mechanism is provided for this purpose in addition to adjustment of motor gear above. Adjust as follows after adjusting motor gear:

1. Loosen fixing bolt on motor bracket using 2.5 mm hex driver. 2. Turn position adjusting bolt on motor bracket in either direction using 3.0 mm hex driver. Note: If it is loosened counter-clockwise, make the bracket follow bolt

- 27 -

Origin point positioning of stitch length In case of large deviation, adjust as follows: Note:

There are two stitch length mechanisms – half-step and full-step versions.

(A) Stitch length (Half-step version) *Stitch length mechanism on half-step version Step motor rotates 7.5 degrees with one pulse and this amount of rotation makes feed regulator rotate 3 degrees under ratio of 1 : 2.5 of motor gear vs feed regulator gear. This amount of rotation makes stitch length vary by 0.5 mm. Stitch pitch of 0.25 mm is half amount of above so that step motor is held at non-exciting position which is midway between exciting positions Stopper pin Screw

Loosen this screw before adjustment

1. Turn off power switch. 2. Loosen one of two screws on motor gear. 3. Turn on power switch and set machine at test mode 2［Zero feed］and motor shaft will be held at one of exciting position. 4. Loosen other screw on motor gear for adjustment and motor gear will become free from motor shaft. 5. Rotate the projection (1) of motor gear until it touches with the stopper pin and you will get position for origin point positioning. Projection (1) of motor gear.

Stopper pin Projection (2)

Switch

- 28 -

6. Temporarily tighten one screw which is located for easier access for adjustment.

7. Set machine at test mode 2 [Zero feed] again by turning on power switch. 8. Activate the origin point positioning of feed motor by turning hand wheel manually. 9. Adjust by moving the motor gear in either direction with 1.5 mm hex driver running machine with a little thick paper placed under presser foot. 10. Check zero feed running machine with a little thick paper under presser foot. 11. Tighten two screws securely after adjustment. 12. Re-check and re-adjust feed balance of actual patterns following procedures in later part of this section.

Projection (1)

(B)Stitch length

(Full-step version)

*Full-step version of stitch length mechanism Step motor rotates 7.5 degrees with one pulse as in the half-step version, but ratio of motor gear vs feed regulator gear is 1 : 5. This amount of rotation makes feed regulator rotate 1.5 degree. This amount of rotation makes stitch length vary by 0.25 mm. 0.25 mm stitch pitch moves at each of 7.5 degree exciting position, but amount of rotation increases two times in comparison to the half-step version for maximum stitch length. This is the details of Full-step version. Shape of stitch length mechanism is different from the half-step version due to the difference of ratio of gears. Check which is the machine serviced according to the shape of motor gear. Feed regulator

Motor gear

Projection (1) Switch

Stopper pin

- 29 -

1. Turn off power switch. 2. Loosen one of two screws on motor gear. 3. Turn on power switch and set machine at test mode 2 [Zero feed] and motor shaft will be held at one of exciting position. 4. Loosen other screw on motor gear for adjustment and motor gear will become free from motor shaft. 5. Rotate projection (1) of motor gear until it touches with stopper pin and you will get position for origin point positioning. 6. Temporarily tighten one screw which is located for easier access for adjustment. 7. Set machine at test mode 2 [Zero feed] again by turning on power switch. 8. Activate the origin point positioning of feed motor by turning hand wheel manually. 9. Adjust by moving motor gear in either direction with 1.5 mm hex driver running machine with a little thick paper placed under presser foot.

Adjust zero feed by turning this screw.

Re-checking and re-adjusting feed balance of actual patterns After checking Feed Zero with needle only, re-check feed balance of actual patterns under following conditions:. 1. Fabric: Demo swatch 2. Thread: Coats & Clark #60 3. Presser foot: Satin foot 4. Actual patterns to be checked: 7422, 7424, 7442, 7444, 7462 and 7464 – zigzag stitch with stitch length at 0.25 and smocking stitch 7426, 7446,*7436 and 7466 – zigzag stitch with stitch length at 0.25 and honeycomb stitch #44 at default position.

- 30 -

7428, 7448 and 7468 – zigzag stitch with stitch length at 0.25, honeycomb stitch #44 at default position and dog pattern #89. 5. Make fine adjustment to obtain feed balance for each pattern. Use fine adjustment mechanism, if available. 6. Tighten screws on motor gear securely after adjustment.

NOTE: Check which is the machine serviced, half-step or full-step version following photographs below. Feed mechanism with half-step movement

Motor gear

Motor gear

Feed mechanism with full-step movement

Motor gear

Motor gear

- 31 -

Meshing motor gear with feed regulator gear When meshing motor gear with feed regulator gear again, follow procedures below: A. Half-step version Mesh these gears so that centers of feed regulator and motor gear and concave hole may be positioned in alignment

Concave portion

Almost straight line

B. Full-step version Rotate motor gear clockwise to touch it with stopper pin and mesh these gears so that feed regulator gear may be positioned with full two gears below line from feed regulator to motor gear

Stopper pin

Full two gears below line

- 32 -

DETAILS OF TECHNICAL ASPECTS OF FEED CONTROL AND ZIGZAG BIGHT CONTROL UNITS FEED CONTROL UNIT - Half step version A. Position of pulse motor gear at origin point Rotational ratio of gear (A) vs pulse motor gear (B) is 1:2.5. Rotation of motor gear (A) is 1/2 step per 1 pulse and 3.75 (7.5 divided by 2) degrees resulting in the gear (B) rotated at 1.5 (3.75 divided by 2.5) degree. There are 48-step exciting positions (segments) with 7.5 degree rotation per 1 step on the pulse motor. Therefore, 7.5 degree rotation per 1 pulse coincides with exciting positions and center of non-exciting positions alternatively. Stitch length is set at 0.25 mm for rotation of motor gear (B) of 3.75 degrees per 1 pulse.

B. Position of feed regulator at maximum forward feed Maximum possible forward feed amount is 4.5 mm from the position shifted 7.5 degrees with 2 pulses from the origin point.

Added: January, 2006 - 33 -

C. Position of feed regulator at zero feed Position of feed zero is shifted with 20 pulses from the origin point and motor gear (A) is rotated at 75 (20 multiplied by 3.75) degrees. Motor gear (B) is rotated at 30 (20 multiplied by 3.75 divided by 2.5) degrees.

D. Position of feed regulator at maximum backward feed Maximum possible backward feed amount is generated at the position shifted with 33 pulses from the origin position and motor gear (A) is rotated with 13 pulses at 48.75 (13 multiplied by 3.75) degrees. Gear (B) is rotated at 19.5 (48.75 divided by 2.5) degrees.

Added: January, 2006

- 34 -

FEED CONTROL UNIT - Full step version A. Position of pulse motor gear at origin point Rotational ratio of gear (A) vs pulse motor gear (B) is 1:5. Rotation of motor gear (A) is 7.5 degrees (1 step per 1 pulse) resulting in the gear (B) rotated at 1.5 (7.5 divided by 5) degree. There are 48-step exciting positions (segments) with 7.5 degree rotation per 1 step on the pulse motor. Therefore, 7.5 degree rotation per 1 pulse coincides with all exciting positions. Stitch length is set at 0.25 mm for rotation of motor gear (A) of 7.5 degrees per 1 pulse.

B. Position of feed regulator at maximum forward feed Maximum possible forward feed amount is 4.5 mm from the position shifted 7.5 degrees with 2 pulses from the origin point.

Added: January, 2006 - 35 -

C. Position of feed regulator at zero feed Position of feed zero is shifted with 20 pulses from the origin point and motor gear (A) is rotated at 150 (20 multiplied by 7.5) degrees. Motor gear is rotated at 30 (20 multiplied by 7.5 divided by 5) degrees.

D. Position of feed regulator at maximum backward feed Maximum possible backward feed amount is generated at the position shifted with 33 pulses from the origin position and motor gear (A) is rotated at 97.5 (13 multiplied by 7.5) degrees and Gear (B) is rotated at 19.5 (97.5 divided by 5) degrees.

Added: January, 2006 - 36 -

ZIGZAG BIGHT CONTROL UNIT

A. Position of pulse motor gear at origin point Rotational ratio of Motor pinion gear (A) vs zigzag cam gear (B) is 1:1. Rotation of motor gear (A) 1/2 step per 1 pulse and 3.75 degrees (7.5 divided by 2) resulting in the gear (B) rotated at 3.75 degrees. There are 48-step exciting positions (segments) with 7.5 degree rotation per 1 pulse on the pulse motor. Therefore, 3.5 degree rotation per 1 pulse coincides with exciting position and center of non-exciting positions alternatively. Zigzag bight is 0.25 mm for rotation of motor gear (A) of 3.75 degrees per 1 pulse.

Added: January, 2006 - 37 -

B. Needle at right position Needle at right position is the position with 2 pulses shifted from the origin point resulting in the gear (B) and gear (A) rotated at 7.5 (3/75 multiplied by 2) degrees. Needle position is located at 3.5 mm from center.

C. Needle at center position Needle at center position is the position with 14 pulses shifted from the extreme right position resulting in the gear (B) and gear (A) rotated at 52.5 (3.75 multiplied by 14) degrees. This position is the position with 16 pulses shifted from the orogin point.

D. Needle at left position Needle at left position is the position with 30 pulses shifted from the origin point and with 14 pulses shifted from the center position resulting in the gear (B) and gear (A) rotated at 52.5 (14 multiplied by 3.75) degrees. Needle position is located at 3.5 mm from center.

Added: January, 2006 - 38 -

Sec. 14

Needle stop at highest position

Needle always stops at its highest position. This is controlled by sensor cam and sensor located on main shaft. Checking: 1. Raise needle to its highest position by turning hand wheel. 2. Push bobbin winder to the right. 3. Check to see if screw (A) of two screws (A & B) on collar fixing sensor cam is located on top. Screw (B) on concave portion of collar faces to the front. Ａ

Ｂ

Adjustment: 1. Raise needle to its highest position. 2. Loosen two screws (A & B) and shift collar so that screw (A) is located on top and tighten it temporarily. 3. Run and stop machine and check to see if needle stops at its highest position. 4. If there is no problem, tighten two screws securely.

- 39 -

Sec. 15 Bobbin holder stopper spring Remove needle plate, bobbin case and retaining bracket beforehand. 1. Place the retaining bracket aligning corner of plate spring with inside of wall (A) of shuttle race as illustrated below and tighten the fixing screw temporarily.

2. Insert the bobbin case into position and adjust the position of retaining bracket so that the projection of bobbin case may be positioned against the spring plate as illustrated below. Tighten the fixing screw securely.

P#86132 Bobbin case

- 40 -

3. Adjust the position of reverse rotation stopper so that there may be a clearance of 1 to 1.5 mm between the projection and plate spring while turning the bobbin case back and forth. Tighten the fixing screw securely.

4. Place the bobbin cover plate into position.

Added : November, 2006

- 41 -

Sec. 16 Motor belt tension

A

Adjustment 1. Remove the front cover. 2. Loosen two nuts (A) and adjust belt tension so that belt maybe bent about 5 mm when it is pushed by pressure of 100g between upper shaft and motor. 3. Tighten the two nuts after checking the belt tension.

Added : November, 2006

- 42 -

Sec. 17 Timing Belt tension

A

Adjustment 1. Remove face cover. 2. Loosen the screw (A) on idler pulley bracket. 3. Tighten the screw (A) after checking the belt tension.

Note: Be sure to recheck “Needle Timing to shuttle” after adjustment.

Added : November, 2006

- 43 -

Sec. 18 Bobbin holder thread tension

Do not adjust the screw as it is set in the factory.

Standard tension: 16g (±1)

Added : November, 2006

- 44 -

Sec. 19 Electronic component area

AC Power Board Component number is 87530 for 120V spec. and 87553 for 230V spec. Be sure to check number printed on board.

Transformer Secondary 5P Connector cord Connect with U

LED lamp harness

Main motor DC 120v

Transformer

YM-45D

Primary

- 45 -

U Board – 1 (for model 7422, 7442 and 7462) Component number for half-step version is 87520. Be sure to check number printed on board.

87520

.

Motor for needle swing

Motor for material feeding

Cam sensor harness

5P connector cable Connected

with

Bobbin winding switch

AC

Buttonhole stitch SW Reverse stitch SW Foot control

Serial port Only for factory Jumper cord 13P Connect cable Connected with switch board

4P Connector cable Connected with switch board

Only for Japan market

Revised: January 2006

- 46 -

U Board – 2 (other models) Component number for half-step version is 87555 and for full-step version is 87585. Be sure to check number printed on board.

87555 Motor for needle zigzag

Motor for material feeding

Not use

Cam sensor harness

5P connector cable Bobbin winding switch

Connect with AC board

Buttonhole stitch SW 4P Connector cable Connect with U

Foot control

Reverse stitch SW Serial port Only for factory Jumper cord 13P Connect cable Connect with switch board

4P Connector cable Connect with switch board

Only for Japan market

Revised: January 2006

- 47 -

U Board – 3 (other models)

Addition

Component number for half-step version is 87555 and for full-step version is 87585. Be sure to check number printed on board.

87585 Motor for needle zigzag

Motor for material feeding

Not use

Cam sensor harness

5P connector cable Bobbin winding switch

Connect with AC board

Buttonhole stitch SW 4P Connector cable Connect with U

Foot control

Reverse stitch SW Serial port Only for factory Jumper cord 13P Connect cable Connect with switch board

4P Connector cable Connect with switch board

Only for Japan market

Added: January 2006

- 48 -

Switch Board – 1 (for model 7422, 7442 and 7462) Component number is 87526. Check number printed on board.

13P Connector Connect with U

4P Connector Connect with U

- 49 -

Switch Board – 2 (for 7446, 7466, 7444 and 7464) Component number for 7446 and 7466 is 87547.

for 7444 and 7464 is 87533.

87533 is the one where jumper wire is cut on 87547. Component number printed on board is 87547 on both boards.

13P Connector Connect with U

4P Connector Connect with U

Jumper wire

4P Connector Connect with U

Twin needle select SW

- 50 -

Switch Board – 3 (for 7426 and 7424) Component number for 7426 is 87563 and for 7424 is 87562. 87562 is the one where jumper wire is cut on 87563. Component number printed on board is 87563 on both boards.

13P Connector Connect with U

63

Twin needle select SW & needle stop select

SW

4P Connector Connect with U Jumper wire

4P Connector Connect with U

- 51 -

Switch Board – 4 (for 7428

＊7436)

Component number is 87564 for 7428, *87578 for *7436. Be sure to check number printed on board.

13P Connector Connect with U

64

Twin needle select SW & needle stop select SW 12 Switches

4P Connector Connect with U

4P Connector Connect with U

Revised: January, 2006

- 52 -

Switch Board – 5 (for 7448 and 7468) Component number is 87548. Be sure to check number printed on board.

13P Connector Connect with U

4P Connector Connect with U

12 Switches

4P Connector Connect with U

Twin needle Select SW Needle stop position select SW

- 53 -

Wiring diagram

- 54 -

＊7436

- 55 -

- 56 -

Parts list for feed control unit of half-step version without fine adjustment mechanism for CB1 model to be used with circuit board #87520 12

6

5

4

1 3

8

13

7a

7b

NO. 1 2 3 4 5 6 7a 7b 8 9 10 11 12 13

Name Motor bracket Metal bush Feed regulator Pinion gear Pulse motor Torsion spring M4 Phillips screw M4 Phillips screw M3 screw Color Washer 1 Washer 2 Vinyl tube（7mm long) M3 phillips screw

Part no. 87123 87176 87229 87246 87600 80113 61225 61222 64653 87217 53321 32949 87266 87256

1 1 1 1 1 1 1 1 4 1 1 1 1 2

NO.

Name Switch Switch cover M3 screw Washer

Part no. 87516 77527 63796 63085

1 1 1 1

NO. Name 14 M3 screw 15 Washer

Part no. 87262 31246

1 1

NO. Name 16 Securing bracket

Part no. 87121

1

* * * *

8

9

2

1

14

15 16

Added :January,2006

- 57 -

Parts list for feed control unit of half-step version with fine adjustment mechanism for CB2/3/4 model to be used with circuit board #87555 6

7

12

5

4

3

1 8

13

NO. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Name Motor bracket Metal bush Feed regulator Pinion gear Pulse motor Torsion spring M4 Phillips screw M3 screw Color Washer 1 Washer 2 Vinyl tube（7mm long) M3 phillips screw bracket Tension spring

NO.

Name Switch Switch cover M3 screw Washer

Part no. 87147 87178 87229 87246 87600 80113 76317 64653 87217 53321 32949 87266 87256 87146 87188

1 1 1 1 1 1 2 4 1 1 1 1 2 1 1

15

2

* * * *

14

9

Part no. 87516 77527 63796 63085

1 1 1 1

8

21

20

NO. 16 17 18 19 20 21

18

Name M3 screw Washer M4 bolt Compression spring AR nut Securing bracket

19

17

16

Added :January,2006

- 58 -

Part no. 87262 31246 87255 87189 73299 87145

1 1 1 1 1 1

Parts list for feed control unit of full-step version with fine adjustment mechanism for CB2/3/4 model to be used with circuit board #87585 7

11 8

4

3

1

12

NO. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Name Motor bracket Metal bush Feed regulator Pinion gear Pulse motor Compression spring M4 Phillips screw M3 screw Clip-on-washer E4 Washer 1 Washer 2 Vinyl tube(3.5mm) M3 socket screw bracket Tension spring

Part no. 87148 87178 87254 87253 87600 87191 76317 64653 1513 59221 2206 87273 80110 87146 87188

1 1 1 1 1 1 2 2 1 2 1 1 2 1 1

NO.

Name Switch Switch cover M3 screw

Part no. 87516 77527 63796

1 1 1

Name M3 screw Washer M4 bolt Compression spring AR nut Securing bracket

Part no. 87262 31246 87255 87189 73299 87145

1 1 1 1 1 1

2 3

* * *

13 5 15 10

14 9

6

21

20

NO. 16 17 18 19 20 21

18

19

17

16

Added :January,2006

- 59 -