Brother BES-941BC instruction manual 176

Chapter 10 Troubleshooting

	Symptom				Measures
Wiper solenoid does not operate.		• Check to see if connection from the wiper solenoid to connector P11 of
			the head PCB is proper.
		• Check the resistance value of the wiper solenoid which does not
			operate with the connector section. The normal resistance value is
			approximately 28Ω.
				If it is faulty, replace the solenoid with a new one. In this case, the
			head PCB may also be faulty. Also replace the head PCB with a new
			one if it does not operate properly even after replacing the solenoid.
		• Refer to the block diagram showing the cable connections and check
			to see if connection from connector P12 of the head PCB to connectors
			P7, 8, 13, 14, 15, and 16 on the power supply PCB in the control box is
			proper.
		• Replace the head PCB with a new one.
The lower shaft PCB is faulty.		1.	Turn off the power of the machine.
		2.	Disconnect P4 and P10 of the lower shaft PCB.
			If the lower shaft PCB is removed from the machine or P8 or P9 is
			disconnected, the lower shaft connected to other lower shaft PCB will
			not operate, either.
		3.	Turn on the power of the machine.
			The E-B2 error occurs and the green LED blinks with the head
			corresponding to the faulty lower shaft. Turn off the pause switch of
			the head (flip it down) and keep flipping up the mending switch until
			the green LED stops blinking.
		4.	If there is just one lower shaft PCB, reset the LEDs of the two heads
			and reset the error with the STOP key on the panel or the step back
			key of the head.
The lower shaft module is faulty.		1.	Turn off the power of the machine.
		2.	Disconnect P1, P3, and P5 (for a fixed bed) or P2, P4, and P6 (for a
			retract bed) connected to the lower shaft PCB from the faulty lower
			shaft module.
		3.	Turn on the power of the machine.
			The E-B2 error occurs and the green LED blinks for the bed
			corresponding to the faulty lower shaft. Turn off the pause switch of
			the head (flip it down) and keep flipping up the mending switch until
			the green LED stops blinking.
		4.	When the LED of the corresponding head stops blinking, reset the
			error with the STOP key on the panel or the step back key of the head.

Note:

The above operation will prohibit operation of the lower shaft connected to the faulty lower shaft PCB or the faulty lower shaft module and cause the corresponding heads to pause. This is reset when the power of the machine is turned on again. Start from the step 3 to prohibit the operation again.

176 BES-941BC • BES-1241BC