Brother BAS-311E service manual Chapter

Chapter 7

Error status	Probable causes	Check/repair/adjust	Parts to be replaced
	4. Fuse has blown	• Remove fuses No.3 and No.4, and check them for	Fuse 6A-250A
		continuity.
		If there is no continuity, replace the fuses with new
		ones, and perform the check/repair/adjust items of
		#1-5.

5. Power supply circuit board	• Separate P4 (ACIN) connectors on the power supply	Power supply
defective	circuit board, and then measure the resistance	circuit board
	between the followin oth cases, the power supply
	circuit board is not defective.
	• Measure the resistance between pins 1 and 2.
	If there is not short, the power supply circuit board is
	not defective.
	• rejoin P4 (ACIN) connectors on the power supply
	circuit board.
	Separate P3 (POWER) connectors on the main circuit
	board, turn on the power, and measure the voltage
	across pins 1 and 3 in the connector on the cable.
	If it is + 5V, the power circuit board is not defective.
	After measurement, turn off the power wait at least 5
	minutes, and then rejoin P3 connectors.

#1

continued

6. Control circuit board defective	• With P3 (POWER) connectors plugged in on the	Control circuit
	control circuit board, turn on the power, and measure	board
	the voltage across pins 1 and 3 in the connector on
	the cable.
	If it is + 5V, the power circuit board is not defective.
	After measurement, turn off the power.

7. Panel circuit board defective

•Check that P18 (PANEL) connectors of the main circuit board and P5 (DRV) connectors of the panel circuit board are plugged in.

Panel circuit board

BAS-311E.311EL.326E.326EL 103