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.

X-axis or Y-axis home position
detection error occurs.

• 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.

The thread breakage error frequently
occurs although thread is not broken.

• 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.

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Detailed Information for Brother BE-1201B-AC-PC User Manual

Lists of information found in Brother BE-1201B-AC-PC User Manual - Page 237

BE-1201B-AC-PC 12-5 Chapter 12 Troubleshooting Symptom Measures The needle bar case lock error occurs.
Is the INDEX motor rotating?
Manually turn the color change pulley.
Start the machine after invalidating its initial setting and enter the needle bar case test mode.
Replace the needle bar position sensor (potentiometer) with a new one.
Replace the head PCB with a new one.
Was the XY carriage moving?
Was the XY motor rotating?
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.
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.

FAQ (Frequently Asked Questions) for Brother BE-1201B-AC-PC User Manual - Page 237

BE-0901E-AC-PC• BE-1201B-AC-PC 12-5 Chapter 12 Troubleshooting Symptom Measures The needle bar case lock error occurs. • Is the INDEX motor rotating?
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. X-axis or Y-axis home position detection error occurs. • 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?