20
MC450e
Tension
release
claw
Setscrew A
Thread release adjusting plate
Thread tension dial
Thread tension gear
Flat part
Convex
part
Thread release
adjusting plate
Setscrew A
Thread release lever
Thread release plate
Setscrew (B)
Fig. B
Fig. C
Foot Sensor/Tension key Free key
Presser Foot Lifter Detecting Switch Adjustment
To adjust:
1. Remove the front and rear cover (refer to pages 4 and
5).
2. Turn the power switch ON while pressing the Start/
Stop button to enter the factory setting mode.
Press “Foot Sensor /Tension” key.
3. Lower the presser foot lifter.
4. Loosen the setscrew A.
Press the tension release claw against the at part of
thread tension gear.
Move the thread release plate to the right so that the
thread release plate touches to the thread release
lever lightly.
Tighten the setscrew A (see Fig. A, B and C).
5. Press “Free” key.
Engage the release hook with the convex part of the
thread tension dial.
* Press “3.4” key to disengage the release hook from
the convex part.
6. Lower the presser foot lifter.
Loosen the setscrew B.
Adjust the presser foot detecting switch position so
the “Foot U/D” should indicate “L” to “H” when the
presser foot is in the middle of the lowered and raised
position (see Fig. A).
• “Foot U/D” should indicate “L” when the presser foot is
lowered, and the release hook is engaged with convex
part of thread tension dial.
• “Foot U/D” should indicate “H” when the presser foot
is raised.
Fig. A
Setscrew (B)
Thread release lever
Thread release plate
Presser foot lifter
detecting switch
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