Brother BE-0901E-AC-PC Instruction Manual page 237

Symptom
The needle bar case lock error
occurs.
X-axis or Y-axis home position
detection error occurs.
The thread breakage error frequently
occurs although thread is not broken.
• Is the INDEX motor rotating?
→ If not, refer to the block diagram showing the cable connections
and check to see if connection from the INDEX motor to the main
PCB is proper.
Check the resistance values of pins 1 and 2 and pins 3 and 4 at the
connector section of the INDEX motor. The normal resistance
value is approximately 10 Ω.
→ If it is not normal, replace the INDEX motor with a new one. Also
replace the main PCB with a new one.
• Manually turn the color change pulley.
→ If it is abnormally heavy, adjust the color change mechanism and
the needle bar case.
• Start the machine after invalidating its initial setting and enter the
needle bar case test mode. Do figures on the panel change when the
color change pulley is manually turned?
→ If not, check to see if connection from the needle bar position
sensor to connector P7 of the head PCB is proper.
• Replace the needle bar position sensor (potentiometer) with a new
one.
• Replace the head PCB with a new one.
• Was the XY carriage moving?
→ If so, refer to the block diagram showing the cable connections and
check to see if connection from the X and Y area sensor to the main
PCB is proper.
• Was the XY motor rotating?
→ If so, check the XY carriage mechanism.
• If the XY motor is not rotating, refer to the cable connection block
diagram and check to see if connection from the XY motor to the main
PCB is proper.
• Enter the needle bar case test mode and turn the thread breakage
sensor pulley while switching the needle bar from number 1
inascending order.
→ If there is no problem, lower the thread breakage sensitivity value of
the machine controller. (The standard value is 0.)
• Check connection from the thread breakage sensor PCB to the head
PCB if the number does not blink.
• Replace the thread breakage sensor PCB with a new one.
BE-0901E-AC-PC• BE-1201B-AC-PC
Chapter 12 Troubleshooting
Measures
12-5