Brother LK3-B430E Mark II Service Manual page 93

Error status Probable causes
#7 1. Work clamp is not lowered
when error code E-60 appears
Work
on the display window.
clamp
does not
rise.
2. Work clamp is not raised
although attempted, when no
error code appears or error
code E-61 appears on the
display window.
• Presser bar lifter solenoid
defective
1. Work clamp is not raised when
#8
error code E-62 appears on the
Work
display window.
clamp
does not
lower.
2. Work clamp is not lowered
although attempted when error
code E-63 appears on the
display window.
Check/repair/adjust
a. If it is not lowered due to the mechanical
lock, see 6-14 "Adjusting the positions of
the presser solenoid" for adjustment.
b. Open the top cover, turn on the power
switch, and press the tip of the plunger
of the presser solenoid. If the work
clamp sensor LED is turned on and off, it
is OK.
c. Make sure P1 (ORG) connector on the
main circuit board and work clamp
sensor are plugged in.
d. See 10-7. "Checking the input sensor and
DIP switch input" to make sure that the
work clamp sensor is connected.
If item b causes no problem and item c
results in defective sensor input, either
the cord connection is poor or the main
circuit board is defective.
a. If it does not rise because of mechanical
problem, see 6-14 "Adjusting the
positions of the presser solenoid."
b. Separate P5 (SOL) connectors on the
main circuit board, and measure the
resistance between pins 3 and 4 in the
connector on the cable.
If the resistance is 2 - 3 ohms, there is no
problem. After measurement, rejoin P5
connectors.
If the resistance is 0 ohms (it means a
short circuit), replace the main circuit
board with a new one because it may be
defective.
c. If the presser bar lifter solenoid does not
operate at all, the main circuit board is
defective.
Same as #7-2.
Same as #7-1.
LK3-B430E Mark II
10. ELECTRIC MECHANISM
Parts to be replaced
Sewing clamp
sensor
Main circuit board
Sewing clamp
solenoid
Main circuit board
Main circuit board
86