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Problem
14. Oil gauge is not visible in oil
sight glass.
Oil gauge
15. "ou" flashes in LED display
when power is turned on.
16. "U" flashes in LED display
when power is turned on.
17. "UE" flashes in LED display
when power is turned on and
treadle is pressed.
18. "oF" flashes in LED display
when power is turned on and
treadle is pressed.
● Is the oil tank empty?
Fill the oil tank with oil.
● Is the oil gauge damaged?
Replace the oil gauge.
● Is the power supply voltage
abnormally high?
Check that the power supply
voltage matches the control
box voltage specifications.
● Is the synchronizer connector inside
the control box disconnected?
Insert the connector securely.
q
● Is detector pin
of the bobbin thread
detector not retracted correctly?
Retract the detector pin
Use an Allen key to move the slider
and check that the detector pin
correctly.
● Is the machine connector inside
the control box disconnected?
Insert the connector securely.
● Is the machine head tilted back?
Return the machine head to
its normal position.
DB2-DD7100A
Possible cause
q
.
w
,
q
moves
15. TROUBLESHOOTING
Voltage rating label
q
w
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