Brother BAS-311A Service Manual

4. Checkng air valve's voltage
NOTE: When the machine is for solenoid specification of the BAS-304A or 311A, there is no need to
connect the air valves.
(J) Presser foot (R) valve
e Presser foot (L) valve
G Intermittent presser valve
(only for BAS-341A and 342A)
® Inner clamp valve
$ Option valve 1
8 Option valve 2
(/) Option valve 3
8 Needle cooler valve
~ +24V
® +24V
NOTE: @to 8 are options.
1) Turn the power switch OFF. Disconnect connector
P8 from J8, then measure the resistance of each
valve.
Resistance of each valve (from (t) to$, e to~)
should be approx. 3000.
2) Connect connector P8 to J8, then turn the power
switch ON.
Insert the test probes into connector P8 from the
lead
wire side, then measure the voltages.
Check points Acceptable value
Between pins 1 (-}and 10 C +)
0.1V-24V
Between pins 2 (-)and 10 C +)
0.1V-24V
Between pins 3 (-}and 10 ( +) 0.1V-24V
When the work clamp pedal is treadled, each
reading
should be max. 24V I min. 0.1V.
3) When the optional valve Is used:
-3-
Measure the resistance between each valve and
®. (Refer to step 1.)
Measure the resistance between each valve (-)
and ® ( +) when each valve operates. (Refer to
step2.)
From the library of: Superior Sewing Machine & Supply LLC

Brother BAS-311A Specifications

General

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