Chapter 10 Troubleshooting

 

 

Symptom

Measures

 

 

The needle stop position error oc-

• Is the main shaft brake solenoid operating?

curs.

If not, refer to the block diagram showing the cable connections and

 

check to see if the connections from the brake solenoid to the power

 

PCB and from connector P27 of the power PCB to connector P1 of the

 

main PCB are proper.

 

• Check the resistance value of the main shaft brake solenoid at the

 

connector section of the solenoid. The normal resistance value is

 

approximately 50Ω.

 

If it is not normal, replace the solenoid with a new one. In this case, the

 

power PCB in the control box may also be faulty. Replace it with a new

 

one if it does not operate properly even after a new solenoid is installed.

 

• Are there any problems with the main shaft mechanism? (i.e., The

 

screw of the main shaft pulley is loose.)

 

 

The needle bar case lock error oc-

• Is the INDEX motor rotating?

curs.

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 4.4Ω.

 

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 cap case.

 

• Start the machine after invalidating its initial setting and operate the

 

head solenoid in solenoid test mode.

 

If a certain head and the heads following it do not operate, refer to

 

the block diagram showing the cable connections and check to see if

 

connection of the head communication sign is proper.

 

• Only head 1 does not operate.

 

Check the communication line to head 1 and connection of the power

 

harness for head 1.

 

• Do the rotary switch settings of each head PCB correspond with the

 

numbers of each head?

 

If not, set them according to the head numbers.

 

• Start the machine after invalidating its initial setting and enter the 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 (1) is proper.

 

• Replace the needle bar position sensor (potentiometer) with a new one.

 

• Replace the head PCB 1 with a new one.

 

 

BES-941BC • BES-1241BC

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Brother BES-941BC instruction manual Symptom Measures
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BES-941BC specifications

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