Brother LK3-B430E Mark II Service Manual page 91

Error status Probable causes
1. Panel PCB detective
#3
No
switches
on the
operation
panel are
activated.
4 1. Home position sensor not
adjusted properly
Home
position
is not
correct.
1. Foot switch and its cord are
#5
defective
Work
clamp
does not
return to
the home
position
(First
even after
position)
the foot
presser
switch is
pressed.
(second
position)
starting
2. Cord in the control box is
defective
1. Fuse has blown when the feed
#6
mechanism does not move
Error
and error code E-A0 appears
code
appears
on the display window.
on the
display
window
when the
foot
switch is
See #1-7.
Look the status of home position signals
referring to page 49.
When both X- and Y-home position signal
lamps are lit, adjust the home position while
referring to page 49.
When either signal lamp is not lit, perform the
check/repair/adjust items of #6.
(Make sure that the power is turned off. If you
proceed from #4, be sure to turn off the
power.)
Remove the foot switch connector from the
outside of the control box, and check it for
Connector on the
continuity between the following pairs of
cable
pins, pins 1 and 2 and pins 7 and 8, in the
connector on the cable:
If it is normally ∞Ω, 0 Ω between pins 1 and 2
when pressing the foot switch to the first
position, or 0 Ω between pins 1 and 2 and
pins 7 and 8 when pressing the foot switch to
the second position, the foot switch and its
cord are not defective.
Rejoin the connector checked in #5-1.
Open the control box, and check P17 (FOOT)
connectors
following pairs of pins, pins 1 and 2 and pins
3 and 4, in the connector on the main circuit
board.
(Do not separate P17 connectors. Make sure
the tester probes touch the leads.)
If it is normally ∞Ω, 0 Ω between pins 3 and 4
when pressing the foot switch to the first
position, or 0 Ω between pins 1 and 2 and
pins 3 and 4 when pressing the foot switch to
the second position, the cord is not defective.
Remove fuse No.1 and check it for continuity.
If there is no continuity, the fuse is defective.
Proceed to #6-2.
LK3-B430E Mark II
Check/repair/adjust
for continuity between
10. ELECTRIC MECHANISM
Parts to be replaced
Panel PCB
Panel cord
Foot switch
Foot switch cord
assy
the
Fuse 5A-250V
84