Brother manual 193

							8. ELECTRIC MECHANISM
Error status	#14 The machine does not operate correctly for the set program during test sewing.
Probable causes						Check/ repair/ adjust		Parts to be replaced
1. Foot switch and cord defec-					•	See #7.
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						Check/ repair/ adjust		Parts to be replaced
1. Cord related		to	machine		a. Make sure P3 (DC18) connector on the			Gate	power	supply
motor is defective						power supply circuit board and P13		cord
						(DC18) on the main circuit board are
						plugged in.
					b. Make sure P5 (DC300) connector on the			Motor	power	supply
						power supply circuit board and P12		cord
						(DC300) connector on the main circuit
						board are plugged in.
					c. Check the connection between P11			Motor cable
						(UVW) connector on the main circuit
						board and the terminal block of the
						machine motor.
2. Main circuit board is defec-					•	Replace the main circuit board with a new		Main circuit board
tive when fuse F1 on the						one when fuse F1 has blown.
main circuit board has blown.
3. Main circuit board defective					•	Separate P12 (DC300) connectors on the		Main circuit board
						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.)
	Red					If the pointer indicates 10KΩ – 30kΩ on
						the x 1kΩ range, the main circuit board is
	Black					not defective.
						After measurement, rejoin P12 connectors.
				3646Q		(If the pointer does not, fuses No.2, 3, and
						4 may be blown. Examine them.)
4. Short cycle operation has					a. Turn off the power and leave the sewing
been run continuously, so the						machine for 30 minutes or more.
sewing machine has over-					b. Turn the power back on. If operation is
heated	and	the	motor’s			normal, the problem is solved.
internal	thermostat			has	Avoid continuous sewing of sewing data that
operated.
					is 15 stitches or less.
Error status	#16 Error code appears on the display window after the machine operates.
Probable causes						Check/ repair/ adjust		Parts to be replaced
1. Synchronizer is defective or					a. Make sure that P2 (SYNCHRO) connec-			Synchronizer assembly
machine	is	not	adjusted			tor on the main circuit board and the
properly	when error			code		synchronizer are plugged in.
E-20 appears on the display					b. See “8-9. Checking the input sensor and
window after the machine is						DIP switch input” to make sure that the
started.						synchronizer is connected.
([E.20] KE-436B, 436C).						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 186