Brother BAS-311E Service Manual page 116

Chapter 7
Error status Probable causes
Work clamp and presser foot for solenoid specification (BAS-311E)
7. Solenoid is defective.
#4
The work
clamp does
not move
up and
down
Work clamp
when the
foot switch
is stepped 8. Control circuit board is defective.
on.
Work clamp
#6
1. Foot switch and cord are
When the
defective.
start switch
is stepped
on, the
work clamp
2. Any cord in the control box is
does not
defective.
return to its
home
position.
1. When the feed mechanism does
not move and error code [E.A1]
appears, fuse has blown.
2. When the feed mechanism does
not move and error code [E.A1]
appears, the power PCB is
defective.
3. When the feed mechanism
#7
moves in the unusual direction
When the
and error code [E.A1] appears,
start switch
the home position sensor is
is stepped
defective.
on, an
error code
appears.
4. When the feed mechanism
operation is unusual, the pulse
motor is defective.
P6 (YPM) or P7 (XPM)
108
• Remove connector P5 (SOL) on the control circuit
board, and measure the resistance between the
following pins in the connector on the cord:
Pins 1 and 2 (presser foot): approx. 5-6
Pins 3 and 4 (work clamp): approx. 5-6
Pins 5 and 6 (thread trimmer): approx. 7-8
Pins 7 and 8 (thread wiper): approx. 6-7
Presser foot
• Remove connector P5 (SOL) on the control circuit
board, turn on the power, and measure the voltage
across the following pins in the connector on the
control circuit board:
Pins 1 and 2 (presser foot): 0 or +55V
Pins 3 and 4 (work clamp): 0 or +55V
Presser foot
• Refer to #4-1
• Refer to #4-2
• Refer to #4-3
• Refer to #4-4.
• Turn power off and then on again. Move the feed
mechanism manually around the home position to
check whether the LED of the home position sensor
is lit.
(The feed mechanism can be moved manually before
the home position is detected.)
• Set the input sensor check mode to check the sensor
input. (Refer to page 90, "7. Checking the input
sensor and DIP switch input".) If the above step (a) is
approved, and the sensor input can not be changed,
the cord or the control circuit board is defective.
• Remove connectors P6 (YPM) and P7 (XPM) on the
control circuit board, and measure the resistance
between the following pins in the connector on the
cord:Pins 1 and 2, pins 2 and 3, pins 3 and 4, pins 4
and 5, and pins 5 and 1.
The resistance in each case should be approx. 2.0 -
2.5 W.
After measurement, return connectors P6 and P7 to
their original positions.
BAS-311E.311EL.326E.326EL
Check/repair/adjust Parts to be replaced
Solenoid
Solenoid code
Control circuit
board.
Foot switch
Foot switch code
assembly
(Quick melting type
5A-250V)
Power PCB
Home position
sensor
Control circuit
board
Pulse motor
Pulse motor
harness