Brother BAS-311E Service Manual page 119

Error status Probable causes
1. The synchronizer is not properly
#17
adjusted.
The
machine
does not
stop with
the needle
at the upper
position.
2. Control circuit board defective
#18
The
machine
can not
sew
patterns as
pro-
grammed.
1. EM switch defective.
#19
The
operation
will not stop
if the
emergency
stop switch
is pressed.
#20
The thread
trimmer
does not
operate
after the
emergency
stop switch
is canceled.
1. Panel circuit board defective
#21
The STEP
BACK
switch is
inoperative.
#22
Sewing is
not
resumed.
1. The programmer connector and
its cable are defective.
#23
Programmi
2. The programmer is defective.
ng can not
be made.
3. Panel circuit, board defective
Check/repair/adjust
• If the needle stop position varies at random every
time the machine operation is complete, adjust
the needle stop position to the upper position.
• Refer to #8-1, 2, 3, 4.
• Remove connector P3 (HEAD) on the control
circuit board, and check the continuity on the
cord.
Between pins 1 and 2:
0 normally or
stop switch is pressed.
Between pins 2 and 3:
when the emergency stop switch is pressed.
• Refer to #16, #17
• Refer to #1 and #2 (panel switch).
• Refer to #8-1, 2, 3, 4 and #13, #14.
• Remove connector P2 (PGM) on the panel PCB
and connector P2 on the programmer PCB, and
then return them to their positions.
• Replace the programmer with a new one.
• Replace the panel circuit board with a new one.
BAS-311E.311EL.326E.326EL
when the emergency
normally or 0
Chapter 7
Parts to be replaced
Control circuit
board.
EM switch
assembly.
Panel circuit board
Programmer
Panel circuit board
111