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CONTENTS
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. SPECIFICATIONS .......................................................................................................... 1
@
. INSTALLATION (COMMON TO BOTH MODELS) ........................................................ 2
1. Setting the belt .....................................................................................................................................3
2. Installing the thread stand ..................................................................................................................4
3. Installing the belt cover, the bobbin winder base and the bobbinwinder ......................................5
4. Installing the hemming binder ............................................................................................................6
5. Applycation of grease .........................................................................................................................7
#
. INSTALLATION (DLN-6390-7).......................................................................................8
1. Installing and settIng of SC-921 .........................................................................................................8
2. Wiring the cords ..................................................................................................................................9
3. Installing the knee switch .................................................................................................................10
4. Piping pneumatic components and wiring electric components ................................................. 11
$
. INSTALLATION (DLN-6390) ........................................................................................12
1. Selecting the motor pulley and the belt ...........................................................................................12
2. Installing the motor ...........................................................................................................................13
3. Set-up of the hemming binder open/close mechanism .................................................................14
4. Set-up of the presser foot lifting mechanism .................................................................................15
5.
Simultaneous operation of the presser foot lifting and open/close of the hemming binder ....................... 16
%
. LUBRICATION AND DRAINING ..................................................................................17
1. Lubrication .........................................................................................................................................17
2. Draining ..............................................................................................................................................18
3. Adjusting the amount of oil ..............................................................................................................19
^
. OPERATION ................................................................................................................21
1. Attaching the needle .........................................................................................................................21
2. Setting the bobbin into the bobbin case .........................................................................................21
3. Threading the machine head ............................................................................................................22
4. Adjusting the stitch length ...............................................................................................................23
5. Winding the bobbin thread ...............................................................................................................24
6. Thread tension ...................................................................................................................................25
7. Theead take-up spring ......................................................................................................................25
8. Adjusting the thread take-up stroke ................................................................................................25
&
. ADJUSTING THE SEWING MACHINE ....................................................................... 26
1. Adjusting the height of the needle bar ............................................................................................26
2. Installing position of the hook ..........................................................................................................27
3. Adjusting the needle stop position ..................................................................................................28
4. Explanation and adjustment of the pedal components .................................................................29
5. Adjusting the wiper ...........................................................................................................................30
6. Hand lifter ...........................................................................................................................................31
7. Adjusting the presser foot pressure (upper feed roller) and
the height of the presser foot (upper feed roller) ...........................................................................31
8. Adjusting the presser foot pressure (presser foot (asm.)) and
the height of the presser foot (presser foot (asm.)) .......................................................................32
*
. TROUBLES IN SEWING AND CORRECTIVE MEASURES .......................................33
(
. THREAD TRIMMER COMPONENTS .......................................................................... 36
1. Checking the receding position of the moving knife and the correcting method .......................36
2. Checking the thread trimmer cam timing ........................................................................................37
3. Counter knife ......................................................................................................................................38
)
. SETUP OF OPTIONAL COMPONENTS .....................................................................39
1. Needle cooler .....................................................................................................................................39
_
. SETTING OF SC-921 ...................................................................................................44
1. Setting of the auto lifter function .....................................................................................................44
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