Singer Advance 7422 User manual

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SERVICE MANUAL
MODEL 7422/7424/7426/7428
7442/7444/7446/7448
7462/7464/7466/7468

 Originalissue: April,2005 Part No. 77350
Revised: July,2005

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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

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
Sec.1Disassembling of covers
(1) Face cover side

Remove screw A.



Removescrew Ｂ.
(2) Back cover side

Remove two self-tapping screws.

A
B
D E

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
Remove two screws F & G.


Remove screw H.
Loosen screw J with washer.


Remove screw K on bottom side.
F G
H
J
K

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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.
L

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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

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Lift up front cover as illustrated.
Lift up front cover as illustrated.
Lower presser foot lever to
removebackcovereasily.

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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
S
Bottom cover
S

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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

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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.
