Janome FOUR-DBL Service Manual
SERVICE MANUAL
MODEL: FOUR-DBL
First Edition: 6 January 2017
CONTENTS
TO CHANGE THE FACE PLATE UNIT ................................................................1
TO CHANGE THE BACK COVER UNIT ..............................................................2
TO CHANGE THE TOP COVER ..........................................................................3
TO CHANGE THE FRONT COVER UNIT ...........................................................4
TO CHANGE THE SIDE COVER UNIT ...............................................................5
TO CHANGE THE MACHINE BASE ...................................................................6
TO CHANGE THE MACHINE SOCKET ..............................................................7
TO ADJUST THE NEEDLE HEIGHT ...................................................................8
TO ADJUST THE PRESSER BAR HEIGHT ........................................................9
TO ADJUST THE FEED DOG HEIGHT .............................................................10
TO ADJUST THE TIMING OF THE NEEDLE AND THE FEED DOG ................11
TO ADJUST THE TIMING OF THE NEEDLE AND THE UPPER KNIFE...........12
TO ADJUST THE HEIGHT OF THE LOWER LOOPER ....................................13
TO ADJUST THE CLEARANCE BETWEEN THE NEEDLES
AND THE LOWER LOOPER/NEEDLE GUARDS ....................14-16
TO ADJUST THE CLEARANCE BETWEEN THE NEEDLES
AND THE FIXED NEEDLE GUARD ..............................................17
TO ADJUST THE POSITION OF THE CHAINING FINGER ..............................18
TO ADJUST THE POSITION OF THE UPPER LOOPER .................................19
TO ADJUST THE TIMING OF THE NEEDLE AND THE LOWER LOOPER .....20
TO ADJUST THE TIMING OF THE UPPER AND LOWER LOOPERS .............21
TO ADJUST THE CLEARANCE BETWEEN THE LOOPERS ...........................22
TO ADJUST THE CLEARANCE BETWEEN THE NEEDLE
AND THE UPPER LOOPER ..........................................................23
TO ADJUST THE POSITION OF THE KNIVES .................................................24
TO ADJUST THE POSITION OF THE LOWER LOOPER THREAD GUIDE .....25
TO ADJUST THE STITCH LENGTH .................................................................26
TO ADJUST THE THREAD TENSION DIALS ...................................................27
PARTS LIST ..................................................................................................28-49
TO CHANGE THE FACE PLATE UNIT
To remove:
1. Loosen setscrew A and remove the face plate unit.
To attach:
2. Fit the U-groove of the face plate between setscrew A and set plate, put the rib of face plate into the
front cover unit and back cover unit and tighten setscrew.
Back cover unit
Set plate
Setscrew A
Front cover unit
Rib
Rib
Face plate unit
U-groove
1
2
To remove:
1. Remove setscrews A and the spool stand.
2. Remove setscrews B, C and D.
3. Remove the back cover unit.
To attach:
4. Put the ribs of back cover into the front cover unit and tighten setscrews B, C and D.
5. Attach the spool stand with setscrew A.
Rib
Rib
Spool stand
Setscrew B
Side cover unit
Back cover unit
Set screw A
Setscrew C
Setscrew D
3
TO CHANGE THE TOP COVER
To remove:
1. Remove the back cover unit.
2. Loosen two setscrews A through hole of thread guide plate as illustration, and remove the top cover.
To attach:
3. Put the ribs in the front cover.
4. Tighten two setscrews A.
Top cover
Front cover unit
Thread guide plate
Set screw A
4
TO CHANGE THE FRONT COVER UNIT
To remove:
1. Remove setscrews A and the looper cover unit.
2. Remove the face plate unit, the back cover unit and top cover.
3. Turn the hand wheel toward you with your hand, and set the upper looper at its lowest position, and
remove setscrews B, C, D, E and the front cover unit.
To attach:
4. Attach the front cover unit with setscrews B, C, D and E.
5. Attach the looper cover unit with setscrew A.
6. Attach the top cover, the back cover unit and face plate unit.
Front cover unit
Upper looper should be set
at its lowest position
Setscrew C
Setscrew B
Setscrew E
Setscrew D
Setscrew A
Looper cover unit
5
TO CHANGE THE SIDE COVER UNIT
To remove:
1. Open the side cover unit. Remove the snap ring E-3 and push down the shaft.
To attach:
2. Attach the side cover unit and insert the shaft and attach the snap ring.
Snap ring E-3
Side cover unit
Shaft
6
TO CHANGE THE MACHINE BASE
To remove:
1. Remove setscrews A, B, C, D and two hinge screws E, and remove two base cushions F and wash-
ers.
2. Remove the machine base.
NOTE: Do not remove another two base cushions.
To attach:
3. Attach the machine base unit, and tighten setscrews A, B, C and D.
4. Attach the two base cushions F, washers, and tighten hinge screws E.
Washer (thick)
Washer
Hinge screw E
Base
cushion F
Setscrew D
Washer (thin)
Machine base
Setscrew C
Setscrew A
Setscrew B
7
TO CHANGE THE MACHINE SOCKET
To remove:
1. Remove the back cover unit.
2. Remove setscrews (A, B) and the machine socket unit from the motor fixing plate.
3. Remove two setscrews C, and pull out the cord connectors.
To attach:
4. Insert the cord connectors as shown below.
5. Attach the machine socket, and tighten two setscrews C.
6. Attach the machine socket unit on the motor fixing plate and tighten setscrews (A, B).
7. Attach the back cover unit.
To lamp socket
Lamp socket lead cord
To motor
Setscrews C
(Brown)
Motor lead cord
(Blue)
(Blue)
(Brown)
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