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Service Manual
SEC.25-4
Trouble contents with LED on panel (4)
Name of al
No.
Way of detect
code
HP signal is not turn to "ON" at initial movement
Trouble of X
of hoop when turning on main power.
axis motor of
7
hoop H.P.
HP signal is not turn to "OFF" at initial movement
of hoop when turning on main power.
HP signal is not turn to "ON" at initial movement
Trouble of Y
of hoop when turning on main power.
axis motor of
8
hoop H.P.
HP signal is not turn to "OFF" at initial movement
of hoop when turning on main power.
nil
9
Problem in
Signal of Cam1 is not inputted while main axis
10
Cam1 signal
motor is operating.
Problem in
Signal of Cam2 is not inputted while main axis
11
Cam2 signal
motor is operating.
Problem in
Signal of Cam3 is not inputted while main axis
12
Cam3 signal
motor is operating.
Both signal of forward sensor and signal of
backward sensor are "ON" at same time when
turned on the sewing machine.
Problem in
B.H. lever
13
signal
Both signal of forward sensor and signal of
backward sensor are "ON" at same time while
sewing is in practice.
Original issue
May 2014
Page 57／64
Model
XL-420
Solution
Replace switch of
stepping motor is
needed.
Replace switch of
stepping motor is
needed.
Replace switch of
stepping motor is
needed.
Replace switch of
stepping motor is
needed.
Replace cam sensor is
needed.
Replace cam sensor is
needed.
Replace cam sensor is
needed.
Replace sensor board
at BH is needed. If
trouble is not solved
after replacement of
sensor board, CPU
board is needed to be
replaced.
Replace sensor board
at BH is needed. If
trouble is not solved
after replacement of
sensor board, CPU
board is needed to be
replaced.
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