Brother BAS-311E service manual Chapter

Chapter 7

Error status			Probable causes	Check/repair/adjust	Parts to be replaced
#17	1.	The synchronizer is not properly		• If the needle stop position varies at random every	�
The			adjusted.	time the machine operation is complete, adjust
machine				the needle stop position to the upper position.
does not
stop with
the needle
at the upper
					Control circuit
position.	2.		Control circuit board defective	�
					board.
#18	�			• Refer to #8-1, 2, 3, 4.	�
The
machine
can not
sew
patterns as
pro-
grammed.
	1.		EM switch defective.	• Remove connector P3 (HEAD) on the control	EM switch
#19				circuit board, and check the continuity on the	assembly.
				cord.
The
				Between pins 1 and 2:
operation
				0 Ω normally or ∞ Ω when the emergency
will not stop
				stop switch is pressed.
if the
				Between pins 2 and 3: ∞ Ωnormally or 0 Ω
emergency
				when the emergency stop switch is pressed.
stop switch
is pressed.
#20	�			• Refer to #16, #17	�
The thread
trimmer
does not
operate
after the
emergency
stop switch
is canceled.
#21	1.		Panel circuit board defective	• Refer to #1 and #2 (panel switch).	Panel circuit board
The STEP
BACK
switch is
inoperative.
	�			• Refer to #8-1, 2, 3, 4 and #13, #14.	�
#22
Sewing is
not
resumed.
				• Remove connector P2 (PGM) on the panel PCB
	1.	The programmer connector and		and connector P2 on the programmer PCB, and	�
#23			its cable are defective.	then return them to their positions.
Programmi	2.		The programmer is defective.	• Replace the programmer with a new one.	Programmer
ng can not
be made.
	3.		Panel circuit, board defective	• Replace the panel circuit board with a new one.	Panel circuit board

BAS-311E.311EL.326E.326EL 111