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1. No display at the operation panel.
1-1) DC power (+5 V, +24V) is not
1-A) AC power is not supplied.
Examine if a power supply is available at the power
supplied.
switch.
1-B) The FLT board has no power
Check whether an AC voltage is available between
supply.
Pins 4-5 of CN1 in the FLT board. If no voltage is found,
check the connections around the power switch or the
power plug.
1-C) The SDC board has no power
Check the connection of CN1 of SDC board.
supply. (The power supply is
is available so long as LED4
Check the connection between CN17 of the SDC board
of the SDC board is lit.)
and CN2 of the FLT board.
Confirm that the inrush protection resistor is normal in
the FLT board.
FLT-T board R2, R3
FLT-S board R1
1-D) The MAIN board has no power
Check the CN31 power supply of the MAIN board.
supply.
1, 2: +48V
3: +24V
4: +5V
5: +33V
6, 7, 8: GND
Check the output voltage in the SDC board unit.
Check if there is shortcircuiting in the 5V power
system for the MAIN board.
1-E) The operation panel has no
Check if there is shortcircuiting in the +5V power
power supply.
system for the operation panel.
Check the connection between CN34 of the MAIN
board and the panel.
1-2) Detection of a momentary
2-A) No momentary interruption
Check the connection between CN3 of the FLT board
interruption in the SDC board
sensor signal input is entered
and CN13 of the SDC board.
LED3 on SDC board:
in the SDC board.
Flashing 9 times
2-B) No AC voltage is available
When a sewing machine for 3-phase specifications
between Pins 4-5 of CN1 in
is used in a 1-phase system, connect the power
the FLT board. (In case of
supply to black and white of the power cord led from
FLT-T board)
the box.
Trouble
Cause (1)
Cause (2)
Check and corrective measures
(3) Electrical components (Refer to “13.-(1) Block diagram A” as well.)