31
DIAGNOSIS CHART
CHECK OPERATION
If nothing happens when you turn on The power
switch, turn off The power and wait 4-5 minute.
Then turn on switch.
STEPS
01) BUZZER, LED
TEST
02) KEY TEST
03) TOUCH PANEL
TEST
04) BOBBIN
WINDER
SWITCH TEST
05) FEED DOG UP/
DOWN SWITCH
KEY TEST
06) SPEED
SETTING SLIDE
SWITCH TEST
07) FOOT
CONTROLLER
TEST
08) PRESSER
FOOT SENSOR
TEST
09) BUTTONHOLE
SENSOR TEST
10) THE AMOUNT
OF BOBBIN
THREAD
ENSOR TEST
11) UPPER SHAFT
POSITIONING
SENSOR TEST
12) STEPPING
MOTORTEST
13) MACHINE
MOTOR TEST
TESTING OPERATION
Turn on the power switch
while pressing
“REVERSE” key
Push START/STOP key
• “REVERSE” key
• “AUTO-LOCK” key
• NEEDLE “UP/DOWN” key
• Press
“PRESS
THIS KEY”
on left side
Press
“PRESS
THIS KEY”
on right side
• Shift the bobbin winder
spindle to LEFT & RIGHT
position
• Shift the drop lever to LEFT
RIGHT position
• Move the slide switch from
left to right
• Move the slide switch from
right to left.
• Press the foot controller
fully and release it
• Lower the presser bar lifter
• Raise the presser bar lifter
• Shift the BH lever back &
forth gently
• Press “START/STOP” key
• Turn the hand wheel toward
you to move the
needle bar to highest position
and lowest position
• Raise the needle bar to
highest position and push
“START/STOP” key
• Lower the needle bar to
lowest position and push
“START/STOP” key
• Turn the hand wheel and
check the feed dog position
• Press START/STOP key
CORRECT CONDITION
• Buzzer sounds (LCD shows buzzer &
LED)
• Red & green lights flash alternately
on START/STOP key
LCD shows “PRESS S/S, REV, AL, U/D”
• Buzzer sounds for next step.
• Buzzer sounds and indicates
“PRESS THIS KEY” at right hand
side on LCD board
• Buzzer sounds for next step
LCD shows “SPOOL”
• Buzzer sounds every time when
bobbin winder spindle is shifted
LCD shows “FEED DOG”
• Buzzer sounds when drop lever
position is changed
LCD shows “SLIDE SWITCH”
• Buzzer sounds at left & right
positions.
LCD shows “CONTROLLER”
• Buzzer sounds when foot controller is
pressed fully and released
LCD shows “FOOT LEVER”
• Buzzer sounds when foot controller is
depressed and released
LCD shows “BH SENSOR STATE”
• When lever is pulled toward you
buzzer sounds & indicates “CLOSED”
on LCD board
• When lever is released buzzer
sounds & indicates “OPEN” on LCD
board
LCD shows “SENSOR & SOLENOID”
• Buzzer sounds and LCD shows “14”
without bobbin
LCD shows “PH SENSOR”
• LCD shows “BIGHP when needle is
at highest position
• LCD shows “FEED” when needle is at
lowest position
LCD shows “STEPPING MOTOR”
• Stepping motor (zigzag) get default
position
• Feeding, tension motors get default
position
• Feed dog goes to home position
LCD shows “DC MOTOR”
• Machine runs slow, and fast, then
needle bar stops at the highest
position
• No buzzer sounds and could not
enter test mode
• LED module shows program
version. Also, program will be
locked
• LED lights or no lights on board
• No buzzer sounds and program
will be locked
• No buzzer sounds and program
will be locked
• No buzzer sound
• No buzzer sound
• No buzzer sound
• No buzzer sound
• No buzzer sound
• No buzzer sound
• LCD shows “0”
If LCD shows No.1 - 13, adjust The
machine
• LCD does not show “BIGHT” or
“FEED” Also LCD does not
change indication vC’hile turning
hand wheel
• Not working correctly
• Not stopping at the highest
position or running at uneven
speed
• Replace board F
• Replace board A
• Replace board F
• Replace board A
• Replace touch
panel
• Replace board A
• Replace board A
• Replace feed dog
switch
• Replace board A
• Replace slide
switch
• Replace board A
• Replace foot
controller
• Replace board A
• Replace presser
foot sensor
• Replace board F
• Replace board A
• Replace BH
sensor
• Replace board F
• Replace board A
• Adjust bobbin
thread sensor unit
• Replace bobbin
Thread sensor
• Replace solenoid
• Replace “A”
board
* Replace upper
shaft positioning
sensor
• Replace “A”
board
• Replace stepping
motor
• Replace tension
sensor
• Replace “A”
board
• Replace DC
motor
• Replace “A”
board
DEFECTIVE CONDITION & CORRECTION
Press
appointed
key
This
key
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