Brother BES-1240BC Instruction Manual page 265

Symptom
Embroidering data buffer empty,
Embroidering start error occurs.
NOTE
This error may rarely occur according
to your PC's performance. If it occurs,
check the items shown on the left.
Presser foot down error occurs.
ERROR C7 occurs.
Main shaft rotation speed error oc-
curs.
Cylinder bed position error occurs.
Power PCB error occurs.
• Has the IF cable come off?
• Has the RS cable on the PC come off?
• Is the PC or machine controller down?
Reboot the PC or machine controller.
• Are any other software programs running on the PC?
• Replace the IF cable.
• Is the presser foot attached?
If not, attach it.
• Does it rise and drop immediately?
If so, adjust the presser foot sensor.
• Does the presser foot rise and make some noise for a while?
If so, check to see if connection from the presser foot sensor to the
head PCB is proper. Replace the presser foot sensor with a new one.
Replace the head PCB with a new one.
• Does the presser foot move? If it does not move at all, check to see if
connection from the presser foot motor to the head PCB is proper.
Replace the presser foot motor with a new one. Replace the head
PCB with a new one.
• Is the lower shaft being tested in the PC test mode?
If so, refer to the operation method of the PC test mode and exit the
test mode or turn the power off once and on again.
• Turn the power off once and on again. If the same error occurs again,
replace the main PCB with a new one.
• Enter the encoder signal test mode and manually turn the main shaft
pulley.
If it is abnormally heavy, the main shaft mechanism is faulty.
• Refer to the block diagram showing the cable connections and check
to see if connection from the main shaft motor to the main PCB is
proper. Also check the connection from connectors P6 and P4 of the
main PCB to connectors P19 and P12 of the power supply PCB in the
box and the connection from connector P11 of the power PCB to the
14v terminal of the power transformer.
• The bed retract sensor is not adjusted properly. Adjust it properly.
• Check to see if connection from connector P16 of the main PCB to
connector P10 of the power supply PCB in the control box is proper.
• Refer to the block diagram showing the cable connections and check
to see if connection from connector P4 of the BC PCB to the power
supply PCB in the control box, and connection from connector P9 of
the main PCB to connector P3 of the power supply PCB in the control
box are proper.
• Replace the power supply PCB with a new one.
• Replace the main PCB with a new one.
BES-940BC • BES-1240BC
Chapter 12 Trouble Shooting
Measures
263