Singer Advance 7422 User manual

-1-

SERVICE MANUAL

MODEL 7422/7424/7426/7428

7442/7444/7446/7448

7462/7464/7466/7468



 Originalissue: April,2005 Part No. 77350

Revised: July,2005

-2-

INDEX

Sec. 1 Disassembling of covers - - - - - - - - - - - - - - - - - - - - - - 1-6

Sec. 2 Test mode - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 7-9

Sec. 3 Adjustment of feed dog height - - - - - - - - - - - - - - - - - - 10

Sec. 4 Needle bar height - - - - - - - - - - - - - - - - - - - - - - - - - - - 11

Sec. 5 Needle position at zigzag stitching - - - - - - - - - - - - - - - 12

Sec. 6 Clearance between needle and shuttle - - - - - - - - - - - - 13-14

Sec. 7 Needle timing to feed dog - - - - - - - - - - - - - - - - - - - - - 15

Sec. 8 Needle timing to shuttle hook - - - - - - - - - - - - - - - - - - -16

Sec. 9 Needle stopper at right position - - - - - - - - - - - - - - - - - 17

Sec. 10 Adjustment of thread tension - - - - - - - - - - - - - - - - - - - 18

Sec. 11 Zigzag bight & stitch balance - -- - - - - - - - - - - - - - - - - -19-25

Sec.12 Needle stops at heighest position - - - - - - - - - - - - - - - - -26

Sec.13 Electrical parts area

AC power board - - - - - - - - - - - - - - - - - - - - - - - - - - - - 27

CPU board - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -28-29

Switch board - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 30-34

Wiring harness - - - - - - - - - - - - - - - - - - - - - - - - - - - - -35-37

-3-



Sec.1Disassembling of covers

(1) Face cover side



Remove screw A.







Removescrew Ｂ.

(2) Back cover side



Remove two self-tapping screws.



D E

-4-



Remove two screws F & G.





Remove screw H.

Loosen screw J with washer.





Remove screw K on bottom side.

F G

-5-

Remove screw L on bottom side.

Remove needle plate by loosening

two screws.



Push up front cove to open inserting

Small screw driver between front and

backcovers.



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.

  Force front cover open by

small screw driver.

40mm

-7-

Lift up front cover as illustrated.

Lower presser foot lever to

removebackcovereasily.

-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.

Disassembling of covers for model 7424・7426・7428

An additional bottom cover is provided on model 7424, 7426 and 7428.

Remove screws S for front cover and then 6 screws on the bottom cover.

Bottom cover

-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,

7462

7424, 7444,

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.



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