26
LCD displays “04”.
When the bobbin winder spindle is
moved to the right, buzzer sounds and
LCD displays the bobbin symbol.
When the bobbin winder spindle is
moved to the left, buzzer sounds and
LCD displays “04”.
CORRECT CONDITION
Sewing lamp and LCD backlight lit.
LCD displays “----”.
01)
FUNCTION OF
LCD, BUZZER
AND LAMP
PROCEDURE
Turn on the power switch while
simultaneously pressing the
needle up/down button and thread
cutter button.
Press the needle up/down button
within the 1.5 seconds to enter the
self-diagnostic mode.
Press the “1” key.
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
Sewing lamp does not lit.
LCD backlight does not lit.
LCD does not display.
Buzzer does not sound.
LCD does not turned on.
LCD does not display any
symbols or not in order.
–REMEDY–
Replace the printed circuit
board A.
Replace the machine lamp.
Replace the touch panel.
Replace the printed circuit
board F.
Buzzer sounds. LCD displays symbols
and numbers and blinks.
LCD displays “02”.
Buzzer sounds when button is
pressed. Button number is displayed
when the button is pressed.
LCD DISPLAYS “S1” WHEN BUTTON 1 IS PRESSED.
LCD DISPLAYS “S2” WHEN BUTTON 2 IS PRESSED.
LCD DISPLAYS “S3” WHEN BUTTON 3 IS PRESSED.
LCD DISPLAYS “F3” WHEN BUTTON 4 IS PRESSED.
LCD displays “03”.
When the buttonhole lever is pulled,
buzzer sounds and LCD displays BH
symbol.
BH symbol
Bobbin symbol
Press the buttons 1 to 4.
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.
Lower the buttonhole lever.
Move the buttonhole lever back and
forth.
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.
Move the bobbin winder spindle to
the right.
Return it 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.
1
4
3
2
02)
BUTTON
03)
BUTTONHOLE
SENSOR
SELF-DIAGNOSTIC TEST
STEP AND
ITEMS T
O
CHECK[
04)
BOBBIN
WINDER
SWITCH
When the buttonhole lever is pushed,
buzzer sounds and LCD displays BH
symbol.
Buzzer does not sound.
LCD does not display the
number correctly.
–REMEDY–
Replace the printed circuit
board A.
Replace the printed circuit
board F2.
Buzzer does not sound.
BH symbol does not appear.
–REMEDY–
Adjust the BH lever sensor
position.
Replace the BH lever sensor.
Replace the printed circuit
board A.
Buzzer does not sound.
Bobbin symbol is not
displayed.
–REMEDY–
Adjust the bobbin winder
switch position.
Replace the bobbin winder
switch.
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...
