ELNA 7200 Service Manual page 33

REFERENCE
TO REMOVE FACE PLATE AND TOP COVER .......................................................................1
TO REMOVE BELT COVER AND MACHINE BASE ................................................................2
TO REMOVE AUTO THREAD CUTTER COVER ....................................................................3
TO REMOVE FRONT COVER .................................................................................................4
TO REPLACE CIRCUIT BOARD A AND FUSE ......................................................................5
TO REPLACE CIRCUIT BOARD K ..........................................................................................6
TO REPLACE CIRCUIT BOARD F ..........................................................................................7
CONNECTION OF CONNECTORS ........................................................................................8
TO ADJUST NEEDLE DROP POSITION ................................................................................9
ADJUSTMENT OF HOOK TIMING .........................................................................................10
ADJUSTMENT OF NEEDLE BAR HEIGHT ...........................................................................11
ADJUSTMENT OF CLEARANCE BETWEEN NEEDLE AND ROTARY HOOK ............................. 12
TO ADJUST THE BACKLASH OF HOOK DRIVE AND LOWER SHAFT GEARS ......................... 13
ADJUSTMENT OF DIRECTION OF PRESSER BAR AND ITS HEIGHT ............................... 14
TO ADJUST THE FEED DOG HEIGHT ..................................................................................15
TO REPLACE NEEDLE THREAD TENSION UNIT ................................................................16
TO ADJUST THE UPPER THREAD TENSION ...................................................................... 17
TO REPLACE NEEDLE THREADER PLATE ......................................................................... 18
TO REPLACE AUTO THREAD CUTTER ...............................................................................19
ADJUSTMENT OF POSITION OF SLIDING PLATE ..............................................................20
TO REPLACE DRIVING MOTOR ...........................................................................................21
TO ADJUST ZIGZAG TIMING ................................................................................................22
ADJUSTMENT OF STRETCH STITCH FEED BALANCE .....................................................23
DIAGNOSIS CHART ............................................................................................................23–28
TO ADJUST BUTTONHOLE LEVER POSITION ....................................................................29
ADJUSTMENT OF PRESSER BAR LIFTER SWITCH POSITION ........................................ 30
TO ADJUST THE AUTO THREAD CUTTER SWITCH POSITION .........................................31