Brother BAS-311G service manual Electrical Mechanism

8. ELECTRICAL MECHANISM

Problem		#2 When the power is turned on, nothing is displayed in the PROGRAM No. display or the menu display.
		Cause			Inspection/Remedy/Adjustment					Replacement if a malfunction
Control program does not operate.			Insert a CF card containing the control program,							Main P.C. board
			turn on the power switch and update the program
			version. (Refer to “3-11. Updating the control
			program”.)
Problem		#3 When the power is turned on, an error code is displayed.
		Cause			Inspection/Remedy/Adjustment					Replacement if a malfunction
1.	If [E025] or [E035] is displayed,		1)	Check if the foot switch is still depressed.						Treadle unit
	the foot switch is still depressed.		2)	Check if there is a harness short-circuit.						Two-pedal foot switch
			3)	Check that connector P6 (FOOT) is inserted
				into the main P.C. board.
2.	If [E055] is displayed, there is a		1)	Check that the machine head switch is OFF.						Machine head switch
	malfunction of the machine head		2)	Check if there is a harness short-circuit.
	switch.		3)	Check that connector P9 (HEAD-SW) is
				inserted into the main P.C. board.
3. If [E065] is displayed, one of the			Check that connector P1				(PANEL)		is inserted	Panel P.C. board
	keys on the operation panel is		into		the main	P.C. board,	and	that	connector	Panel harness
	still depressed.		CN2		(MAIN)	is inserted into		the panel P.C.
			board.
4.	If [E403] is displayed, there is a		1)	Check that connector P17 (M-MOTOR) is						Harness
	poor	connection between the		inserted into the main P.C. board, and that						Power supply motor P.C.
	main P.C. board and the PMD			connector P6 (MAIN) is inserted into the						board
	P.C. board.			power supply motor P.C. board.						Main P.C. board
			2)	Check if there is a harness short-circuit.
5.	If [E401] is displayed, there is a		1)	Check that connector P1 (MAIN) is inserted						Main P.C. board
	poor	connection between the		into the power supply motor P.C. board.
	main P.C. board and the power		2)	Check if there is a harness short-circuit.
	supply motor P.C. board.
6.	If [E450] or [E452] is displayed,		1)	Check that connector P3 (HEAD-M) is						Machine head memory
	the	machine head memory		inserted into the power supply motor P.C.
	cannot be verified.			board.
			2)	Check if there is a harness short-circuit.
7. If [E700] is displayed, there is an			1)	Check that the power supply voltage at the
	abnormal rise in the power			wall outlet is within the range of the
	supply voltage.			specification voltage +/- 10%.
			2)	Refer to check items #1-2 and #1-3.
8. If [E705] is displayed, there is an			1)	Check that the power supply voltage at the
	abnormal drop in the power			wall outlet is within the range of the
	supply voltage.			specification voltage +/- 10%.
			2)	Refer to check items #1-2 and #1-3.
9.	If [E740] is displayed, there is a		1)	Check if there are any thread scraps blocking						DC fan motor assembly
	malfunction of the cooling fan.			the cooling fan.
			2)	Check that connector P22 (FAN) is inserted
				into the main P.C. board.

126 BAS-311G, BAS-326G