Brother BAS-311E service manual Chapter, cannot sew

Chapter 7

Error status				Probable causes		Check/repair/adjust	Parts to be replaced
	2. The control circuit board is					• Remove connector P15 (DC300) on the control	Control circuit
		defective.				circuit board, and measure the resistance between	board.
#13						pins 1 and 2 in the connector on the control circuit
						board.
The
						(A digital meter can not be used.) Using X1K Ω
machine
						range, the needle should indicate 10K Ω -30K Ω.
does not
						After measurement, return P15 to its original
operate for
						position.
sewing and
						(If this measurement is not approved, check
error [E.20]
					Red	control circuit board fuses nos. 2, 3, and 4. They
appears.
						may be blown.)
					Black
	1. When error code [E.20] appears					• Check that connector P2 (SYNCHRO) on the	Synchronizer
		after the machine operates, the				control circuit board is securely inserted and there	assembly
		synchronizer is defective.				is no damage in the synchronizer cable.
#14
After the	2.	When error code [E.20] appears				• Turn the pulley manually to check it can easily	�
machine		after the machine operates, the				rotate.	�
operates,
		machine has been locked due to
an error
		insufficient adjustment.
code
appears.
	3. When error code [E.90] appears					• Refer to #1.1-5	�
		after the machine operates, the				If the power supply capacity per machine is 600VA
		power supply voltage has				or more, the voltage sharply drops as soon as the
		sharply dropped.				machine starts, resulting this error to appear.
	1. The synchronizer is defective.					• Refer to #14-1.	Synchronizer
#15						Even if the synchronizer is defective, the test	assembly
The						feeding will be performed correctly.
machine
cannot sew
patterns as	2.	The feed mechanism does not				• Refer to #8-1, 2, 3, 4.	�
pro-
grammed.		move as programmed.
	1.	Mechanical adjustment is				• Remove the covers. If the solenoids for thread	�
		insufficient.				trimmer and thread wiper do not operate, check	�
						the following items.
	2.	The solenoid is defective.				• Refer to #4-7. (When measuring for thread wiper,	Solenoid
#16						turn on the thread wiper switch.)	Solenoid harness
Thread
trimmer
and thread
wiper do
not	Thread				d trimmer
			wiper Threa
operate.
	3. The control circuit board is					• Remove connector P5 (SOL) on the control circuit	�
		defective.				board, turn on the power, start sewing, and	�
						measure the voltage across the following pins in
						the connector on the control circuit board:
						Pins 5 and 6 (thread trimming)
						Pins 7 and 8 (thread wiper)
						The voltage in each case should be output for an
	Thread w				ad trimmer	instance at the end of sewing.
				iper Thre

110 BAS-311E.311EL.326E.326EL