ELNA 683, 686 User manual

elna 683 - 686
SERVICE MANUAL
08/2002 Printed in Switzerland 396 901-92

INDEX
FRAME DISMANTLING
BULB COVER 1
FRONT PANEL 1
EXTENSION TABLE 2
BELT COVER 3
BACK COVER 4
ADJUSTMENTS
THREAD TENSION 5
NEEDLE BAR HEIGHT 6
FEED DOG LIFT 7
NEEDLE BAR TIMING 8
FEED DOG HEIGHT 9
PROJECTION OF THE UPPER LOOPER 10
RADIUS OF THE LOWER LOOPER 11
STOPPING POINT OF THE LOWER LOOPER (SYNCHRONIZATION) 12
LOWER LOOPER TIMING 13
CLEARANCE BETWEEN LOWER LOOPER AND LEFT AND RIGHT NEEDLE 14
TIMING BETWEEN UPPER AND LOWER LOOPER 15
CLEARANCE BETWEEN LOWER LOOPER AND UPPER LOOPER 16
NEEDLE GUARD 17
LOWER LOOPER TAKE UP LEVER 18
UPPER LOOPER TAKE UP LEVER 19
PRESSER BAR HEIGHT 20

BULB COVER
1. Unscrew the screw A
2. Remove the bulb cover
FRONT PANEL
1. Remove the bulb cover (see bulb
cover page 1).
2. Remove le bulb.
3. Unscrew the screw B.
1. Unscrew the three screws C.
2. Push the front panel slightly upwards
to unhook the front panel on the top
from rear panel.
3. Remove the front panel.
1

EXTENSION TABLE
1. Loose the two screws A.
1. Remove the screw cap D with a
needle.
1. Pull out the cutter dial. Protect with
small fabrics the cutter dial when the
cutter dial is pinched and pull them
out.
Replace the cutter dial.
1. Place the cutter dial so that the button
can turn and all numbers from 5 to 7
are facing to the red arrow on the
window.
2. Tighten the cutter dial and place the
screw cap.
1. Unscrew the two screws F.
2. Push the base plate downwards and
remove the extension table.
2

BELT COVER
1. Remove the Front panel (see page 2).
2. Loose the two screws A.
3. Unscrew the screw B.
4. Unscrew the C.
5. Push the base plate downwards in
direction of the arrow to remove the
belt cover.
3

BACK COVER
1. Dismantle the front panel.
2. Dismantle the extension table.
3. Dismantle the belt cover.
4. Unscrew the two screws A.
5. Push the base plate in direction of the
arrow to remove the back cover.
In this position, the back cover can be
moved sufficiently in order to make all
adjustments. If the back cover should be
replaced however, the handle must be
dismantled.
See next photo.
6. Remove the clip B left and right from
the handle.
7. Push out the two axles C to remove
the top of the handle.
8. Remove the back cover for changing.
4

THREAD TENSION
Value on position 4.
Blue 30-34 g
Red 14-16 g
Yellow 11-13 g
Green 30-34 g
To check the tension, use our tension spring-
balance (101670).
Preparation for the thread tension adjustment:
1. Use a 50/2 white polyester thread.
2. The thread is threaded normally from the bobbinholder to the pre-tension and tension.
3. Lower the pressure bar
How to adjust:
1. Turn the tension dials so that the number
4 is in line with the mark C.
2. Verify the thread tension.
Adjustment:
Insert a pencil in to the hole Eand push the
regulate blocking pin to the left, outside
from the ring D.
A
B
1. If the tension is too weak, hold the tension
ring Din position and turn the tension dial in
direction B.
2. If the tension is too strong, hold the tension
ring Din position and turn the tension dial in
direction A.
3. Recheck the tension and if needed repeat the
adjustment.
5

NEEDLE BAR HEIGHT
1. Remove the front panel (see page 1).
2. Remove the bulb socket (two screws).
3. Adjust the needle bar height (see drawing below).
6

FEED DOG LIFT
1. Remove the back cover (see page 4)
2. Loose the screw A.
3. Turn the feed dog cam so that the feed dog is moving as shown below.
7