Brother KE-430B Service Manual page 193

Error status #14 The machine does not operate correctly for the set program during test sewing.
Probable causes
1. Foot switch and cord defec-
tive
Error status #15 The machine does not operate during sewing, and the error code E-20 appears on the
display window. ("E.20" appears for the KE-436B and 436C.)
Probable causes
1. Cord related to
motor is defective
2. Main circuit board is defec-
tive when fuse F1 on the
main circuit board has blown.
3. Main circuit board defective
Red
Black
4. Short cycle operation has
been run continuously, so the
sewing machine has over-
heated and the
internal thermostat
operated.
Error status #16 Error code appears on the display window after the machine operates.
Probable causes
1. Synchronizer is defective or
machine is not
properly when error code
E-20 appears on the display
window after the machine is
started.
([E.20] KE-436B, 436C).
• See #7.
machine a. Make sure P3 (DC18) connector on the
power supply circuit board and P13
(DC18) on the main circuit board are
plugged in.
b. Make sure P5 (DC300) connector on the
power supply circuit board and P12
(DC300) connector on the main circuit
board are plugged in.
c. Check the connection between P11
(UVW) connector on the main circuit
board and the terminal block of the
machine motor.
• Replace the main circuit board with a new
one when fuse F1 has blown.
• Separate P12 (DC300) connectors on the
main circuit board, and measure the
resistance between pins 1 and 2 in the
connector on the main circuit board with
the same polarity as shown in the left
figure.
(Use of a digital meter is prohibited.)
If the pointer indicates 10K – 30k on
the x 1k range, the main circuit board is
not defective.
After measurement, rejoin P12 connectors.
(If the pointer does not, fuses No.2, 3, and
3646Q 4 may be blown. Examine them.)
a. Turn off the power and leave the sewing
machine for 30 minutes or more.
b. Turn the power back on. If operation is
motor's normal, the problem is solved.
has
Avoid continuous sewing of sewing data that
is 15 stitches or less.
a. Make sure that P2 (SYNCHRO) connec-
adjusted tor on the main circuit board and the
synchronizer are plugged in.
b. See "8-9. Checking the input sensor and
DIP switch input" to make sure that the
synchronizer is connected.
If signal is switched on and off, there is
no problem.
c. Turn the pulley by hand to check it can
easily rotate.
d. If error code E-20 (E.20) appears when
the machine is stopped, see "5-20.
Adjusting the thread trimming solenoid
position" for adjustment.
KE-430B, 430C series
Check/ repair/ adjust
Check/ repair/ adjust
Check/ repair/ adjust
8. ELECTRIC MECHANISM
Parts to be replaced
Parts to be replaced
Gate power supply
cord
Motor power supply
cord
Motor cable
Main circuit board
Main circuit board
Parts to be replaced
Synchronizer assembly
186