Brother BAS-311A Service Manual

. ·, ~
NO. IN CHAPTER 8
PROBABLE CAUSES
REPLACEMENt
FLOWCHART AND
CHECK/ ADJUSTMENT I REPAIR
PAR15
··".
ERROR STATUS
#4
5. AJ r valve defective
(a) Unplug connector P1 of the control box,
Air valve
The presser plate
then measure the resistance.
will not rise when
If it is not approx. 400 0 between pins 1
the presser plate
1(QJ@©
9
and 10. and between pins 2 and 10, the
lifter switch is
air valve is defective.
stepped on.
@©(QJ
:1
[9
'·
(Q)@(Q]
4[Q)©©
12
P1
For solenoid specification (BAS~304A and 311A)
4. Mafn PCB defectiv~
(a} Refer to #2, 2(a).
Main PCB
+
(b) Step on the presser plate lifter switch
while pressing STEP BACK switch.
3 9
If an error code appears on the ERROR
~00
. indicator, the main PCB is not defective.
(c)* Unplug connector P1 of the control box,
00~
tum on the power, then measure the
voltage of J 1 while stepping on the start
0
switch. If It is not approx. 10 VDC
1
7
between pins 3 (+)and 4 (·),the main
circuit board
Is defective.
P1
-
S. Air valve defective (a) Unplug connector P1, then measure the
Air valve
resistance.
If it is not approx. s ohms between pins 3
9
3
and 4, the solenoid is defective.
000
[ooo
000
7
1
-18-
From the library of: Superior Sewing Machine & Supply LLC

Brother BAS-311A Specifications

General

Brand	Brother
Model	BAS-311A
Category	Sewing Machine
Language	English