28
CORRECT CONDITION
LCD displays “08”.
STEP AND
ITEMS TO
CHECK
08)
FOOT
CONTROL
PROCEDURE
Attach the foot control to the
machine.
Depress the foot control as far as
it goes, then release it.
If the result is correct condition,
press the start/stop button to
proceed the next step.
If the result is defective condition,
press the reverse stitch button to
proceed the next step.
DEFECTIVE CONDITION
The foot control symbol
does not appear.
Buzzer does not sound.
–REMEDY–
Replace the foot control.
Replace the machine
socket (foot control socket).
Replace the printed circuit
board A.
Shift the slide volume from left to
right, then return to the left.
If the result is correct condition,
press the start/stop button to
proceed the next step.
If the result is defective condition,
press the reverse stitch button to
proceed the next step.
09)
SLIDE
VOLUME
Press the needle up/down button.
If the result is correct condition,
press the start/stop button to
proceed the next step.
If the result is defective condition,
press the reverse stitch button to
proceed the next step.
The foot control symbol appears when
the foot control is attached.
Buzzer sounds when the foot control
is deeply depressed.
Buzzer sounds when the foot control
is released.
LCD displays “09”.
10)
DC MOTOR
Buzzer sounds at rightmost or leftmost
position.
LCD displays “10”.
Buzzer does not sound.
–REMEDY–
Replace the printed circuit
board A.
The machine motor does not
start.
The motor stops
immediately.
The motor runs unstable.
LCD displays “NG“.
–REMEDY–
Replace the DC motor.
Replace the printed circuit
board A.
SELF-DIAGNOSTIC TEST
Machine runs slow, then fast, and the
needle bar stops at its highest position.
LCD displays “OK”.
11)
THREAD
TENSION
RELEASE
SOLENOID
Foot control
symbol
Lower the presser foot.
Press the needle up/down button.
If the result is correct condition,
press the start/stop button to
proceed the next step.
If the result is defective condition,
press the reverse stitch button to
proceed the next step.
LCD displays “11” and “–off”.
Press the needle up/down button to
switch the solenoid on or off.
[ON]
Buzzer sounds and the thread
tension disk opens, and LCD displays
“--on” while the thread tension disk
opens. The thread tension disk will be
closed automatically 5 seconds after
the thread tension released.
[OFF]
Buzzer sounds and the thread tension
disc closes, and LCD displays “–off”.
The thread tension disk does
not open.
–REMEDY–
Replace the solenoid.
Replace the printed circuit
board A.
Summary of Contents for 5270QDC
Page 1: ...First Edition 06 March 2020 SERVICE MANUAL PARTS LIST MODEL 5270QDC For Europe only...
Page 39: ...37 TOUCH PANEL KEY POSITION ADJUSTMENT GUIDE Print this illustration guide to its actual size...
Page 52: ...50 MODEL 5270QDC PARTS LIST 1 2 3 4 6 5 7 8 9 10 11 12 13 14 17 15 18 19 20 9 21 21 22 23 16...
