Brother BAS-311G service manual Electrical Mechanism

8. ELECTRICAL MECHANISM

Problem		#19	An error code is displayed after the sewing machine operates.
		Cause						Inspection/Remedy/Adjustment		Replacement if a malfunction
1. If [E120], [E121] or [E130] is							1)	Check that connector P5 (SYNC)	is	Motor assembly CCD-430D
	displayed		after	the	sewing			connected to the power supply motor P.C.
	machine operates, there is a							board and that the synchronizer is
	malfunction of the synchronizer,							connected.
	interference is causing operating						2)	Check the synchronizer input while referring
	problems,		or	the	sewing			to “2-8. Input checking method”.
	machine is incorrectly adjusted.							OK if the signal turns on and off.
							3)	Turn the pulley by hand and check that it
								turns smoothly.
							4)	Check that connector P17 (M_MOTOR) is
								connected to the main P.C. board and that
								connector P6 (MAIN) is connected to the
								power supply motor P.C. board.
							5)	Check the harness between connector P17
								(M_MOTOR) of the main P.C. board and
								connector P6 (MAIN) of the power supply
								motor P.C. board.
							6)	Check that the ground wire is connected to a
								secure ground and that there is no equipment
								nearby that is generating strong electrical
								interference.
							7)	If [E121] is displayed when the sewing
								machine stops:
								• Check if the thread trimming solenoid is
								operating.
								• Adjust the thread trimming mechanism.
2.	If [E150] is		displayed		after	the	1)	Turn off the power and let the sewing
	sewing	machine		operates,		the		machine stand for 30 minutes.
	motor is abnormally overheating.						2)	Turn the power back on; OK if operation is
								normal.
							3)	If the area around the motor is not hot, carry
								out the steps for [E121].
							Avoid repeated sewing of sewing data that is
							less than 15 stitches.
Problem		#20	Sewing is incorrect.
		Cause						Inspection/Remedy/Adjustment		Replacement if a malfunction
1.	Malfunction of synchronizer						Refer to inspection #19.
2.	If uneven seams occur, there is						1)	Refer to inspection #7-3.
	a malfunction of the pulse motor						2)	If uneven seams are occurring because the
	or the mechanism is incorrectly							work clamp pressure is too weak, adjust the
	adjusted.							work clamp lift amount while referring	to
								“7-14. Adjusting the work clamp lift amount”.
							3)	If there is play in the feed mechanism, adjust
								the feed mechanism.

134 BAS-311G, BAS-326G