ELNA Elnita ec 30 Service Manual page 23

STEP AND
ITEMS TO
CHECK
07)
Attach the foot control to the
FOOT
machine.
CONTROL
Depress the foot control as far as
it goes, then release it.
If the result is correct condition,
press the MODE key to proceed
the next step.
If the result is defective condition,
press the reverse stitch button to
proceed the next step.
Shift the slide volume from left to
08)
SLIDE VOLUME
right, then return to the left.
If the result is correct condition,
press the MODE key to proceed
the next step.
If the result is defective condition,
press the reverse stitch button to
proceed the next step.
09)
Press the needle up/down button.
DC MOTOR
If the result is correct condition,
press the MODE key to proceed
the next step.
If the result is defective condition,
press the reverse stitch button to
proceed the next step.
SELF-DIAGNOSTIC TEST
PROCEDURE
CORRECT CONDITION
LED displays "7 ".
The "7F" appears when the foot
control is attached.
Buzzer sounds when the foot control
is deeply depressed.
Buzzer sounds when the foot control
is released.
LED displays "8 ".
Buzzer sounds at rightmost or
leftmost position.
LED displays "9 ".
Machine runs slow, then fast, and
stops.
LED displays "OK" when the
machine is correct condition.
LED displays "NG" when the
machine is defective condition.
21
DEFECTIVE CONDITION
The foot control symbol
does not appear.
Buzzer does not sound.
–REMEDY–
Replace the foot control.
Replace the switching
regulator (foot control
socket).
Replace the circuit board A.
Buzzer does not sound.
–REMEDY–
Replace the circuit board A.
The machine motor does
not start.
The motor stops
immediately.
The motor runs unstable.
–REMEDY–
Replace the DC motor.
Replace the circuit board A.