Brother BES-1240BC Instruction Manual page 267

Symptom
X-axis motor overcurrent stop oc-
curs.
Y-axis motor overcurrent stop oc-
curs.
The following errors frequently occur.
• Lower shaft memory error
• ERROR E5 to ERROR FF
Only a certain head does not oper-
ate.
Jump solenoids and wiper solenoids
of all heads do not operate.
• Measure the resistance values of pin 1 and pin 2, pin 2 and pin 3, pin 3
and pin 4, pin 4 and pin 5, and pin 5 and pin1 at each connector section
of two X-axis motors with the tester and check to see if they are
approximately 2.1 .
Replace the faulty motor with a new one.
• Refer to the block diagram showing the cable connection and check to
see if connection from the X-axis motor to the main PCB is proper.
• Replace the main PCB with a new one.
• Measure the resistance values of pin 1 and pin 2, pin 2 and pin 3, pin
3 and pin 4, pin 4 and pin 5, and pin 5 and pin 1 at each connector
section of the Y-axis motor with the tester and check to see if they are
approximately 2.4 .
Replace the faulty motor with a new one.
• Refer to the block diagram showing the cable connection and check
to see if connection from the Y-axis motor to the main PCB is proper.
• Replace the main PCB with a new one.
• Replace the main PCB with a new one.
• Is the head out of action with either the head switch or the machine
controller?
• Refer to the block diagram showing cable connections and check to
see that other cables are connected to the head switch PCB and the
head PCB and the head PCB properly.
• Refer to the block diagram showing cable connections and check to
see if connection from connector P4 of the power supply PCB in the
control box to connector P6 of the power supply PCB in the power
supply base, and connection from connector P5 of the power supply
PCB in the power supply base to the 39 terminal of the power
transformer are proper.
• Check fuse F4 on the power supply PCB in the power supply base.
If it is blown, replace it with a new one. The 50v circuit is faulty if the
fuse is blown immediately after turning on the power even after
replacing the fuse.
BES-940BC • BES-1240BC
Chapter 12 Trouble Shooting
Measures
265