CONTENTS
1.
Products specification .......................................................................................2
2. Outlook .....................................................................................................................3
3. Names of
principal
parts ..........................................................................................4
4.
Removing methods
of
externalparts
4.1 Face plate..........................................................................................................5
4.2 Free arm cover ..................................................................................................5
4.3 Base plate..........................................................................................................5
4.4 Back cover.........................................................................................................5
4.5 Front cover ........................................................................................................6
5.
Adjusting methods
of each
part
5.1 Symbol instructions ...........................................................................................7
5.2 Play of arm shaft................................................................................................7
5.3 Play of arm shaft worm and pattern cam...........................................................8
5.4 Drop middle point of needle...............................................................................8
5.5 Height of presser foot ........................................................................................9
5.6 Needle flow at maximum zigzag width ............................................................10
5.7 Drop middle point of needle.............................................................................11
5.8 Needle position of zigzag ................................................................................12
5.9 Height of needle bar........................................................................................13
5.10 Automatic needle threader adjustment............................................................14
5.11 Distance-needle-hook......................................................................................15
5.12 Timing of needle and hook ..............................................................................16
5.13 Distance adjustment between shuttle driver shaft gear complete and
lower shaft gear complete ...............................................................................17
5.14 Play between shuttle driver shaft gear and lower shaft gear...........................18
5.15 Feed cam position adjustment.........................................................................19
5.16 Feed lifting rock cam position adjustment .......................................................19
5.17 Feed-dog height ..............................................................................................20
5.18 Position of the feed-dog in relation to the needle plate (front to back) ............21
5.19 Position of feed-dog in relation to the needle plate (left to right) .....................22
5.20 Upper thread tension adjustment ....................................................................23
5.21 Lower thread tension adjustment ....................................................................24
5.22 Motor belt tension............................................................................................25
5.23 Reverse patterns .............................................................................................26
5.24 Forward and reverse stitching in buttonhole sewing (feeding pitch of
reverse and forward stitching is not even).......................................................27
5.25 Buttonhole upper and lower stitching problem ................................................28
5.26 Bobbin winding problem ..................................................................................29
6.
Circuit
diagram
........................................................................................................30
A
TTENTION
Be sure to observe the following, as they may well become causes for fire,
electric-shock, injuries, and damage to parts.
- Be sure to unplug power source before engaged in disassembly, installation,
adjustment.
- In case of installing please pay special care to clamp electrical cords, etc., scars
to sheath, mis-circuit, etc.
- Be sure to use regular standard part in replacing.
