Janome 4300QDC Service Manual page 22

stEP and
itEms to
ChECk
Move the presser foot lifter up and
05)
down.
PrEssEr
Foot liFtEr
If the result is correct condition,
sWitCh
press the start/stop button to
06)
proceed the next step.
If the result is defective condition,
press the reverse stitch button to
proceed the next step.
uPPEr shaFt Turn the handwheel toward you.
Positioning
Lower the needle bar from its
sEnsor
highest to lowest position.
07)
Raise the needle bar from its
lowest position to highest
position.
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.
Turn the handwheel toward you.
zigzag motor
Lower the needle bar its highest
(stEP motor)
to position (zigzag phase).
and
FEEd motor Press the needle up/down button.
Raise the needle bar from its
lowest position to its highest
position (feed phase).
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.
sElF-diagnostiC tEst
ProCEdurE CorrECt Condition
LCD displays "05".
When the presser foot lifer is lowered,
buzzer sounds and LCD displays
presser foot symbol.
When the buttonhole lever is raised,
buzzer sounds and the presser foot
symbol disappears.
LCD displays "06".
Turn the handwheel.
LCD displays stitch width symbol
when the needle bar is at zigzag
phase.
LCD displays stitch length symbol
when the needle bar is at feed
phase.
LCD displays "07".
Press the needle up/down button
when LCD displays stitch width
symbol.
The Zigzag motor will be initialized
and get its default position.
Press the needle up/down button
when LCD displays stitch length
symbol.
The feed motor will be initialized
and get its default position.
20
dEFECtivE Condition
Buzzer does not sound.
Presser foot symbol does
not appear.
–rEmEdy–
Adjust the presser foot
Presser
lifter switch position.
foot
Replace the presser foot
symbol
lifter switch.
Replace the circuit board
A.
Buzzer does not sound.
Stitch width or length
symbol does not appear.
–rEmEdy–
Replace the circuit board
A.
Replace the circuit board
P.
Stitch
width
symbol
Stitch
length
symbol
Zigzag motor does not get
default position.
Stitch
buzzer does not sound.
width
–rEmEdy–
symbol
Replace the zigzag motor.
Replace the circuit board
A.
Stitch
length
Feed motor does not get
symbol
default position.
buzzer does not sound.
–rEmEdy–
Replace the feed motor.
Replace the circuit board
A.