Brother BAS-311E Contact failure, Feed mechanism, Work clamp lifter and thread trimmer mechanisms

Chapter 6 Power supply and electrical parts adjustment

■Contact failure

•The connectors functions are divided into four categories. Some connectors may belong to more than one group. Be sure to investigate another category if a problem is not found in one category.

•Ffor the details of connections, refer to the control circuit block diagram at the end of this manual.

1.Feed mechanism

Problem Connector No. and position

• Home position is not properly detected.

�

Main PCB

• Error [E.A1] appears.

X home

Y home

position

position

sensor

sensor

• Forward feed does not operate correctly.

�

Main PCB

• Error [E.A1] appears.

Y pulse motor

• Sideways feed does not operate correctly.

�

Main PCB

• Error [E.A1] appears.

X pulse motor

2. Work clamp lifter and thread trimmer mechanisms

• The work clamp does not operate.

�

• The machine does not operate.

Main PCB

Control

box

Foot switch

• The work clamp does not operate. BAS-311E (Solenoid type)

�

• Thread trimming is not performed.

Main PCB

• Thread wiper does not operate.

• The work clamp does not oeprate.

Sewing

Presser

Wiper

Thread

trimming

clamp

foot

solenoid

solenoid

solenoid

solenoid

78 BAS-311E.311EL.326E.326EL