Brother BAS-311G service manual Electrical Mechanism

									8. ELECTRICAL MECHANISM
Problem #1 The power indicator does not illuminate when the power is turned on.
	Cause		Inspection/Remedy/Adjustment						Replacement if a malfunction
3.	Malfunction of power cord	Disconnect connector P9 (ACIN) on the power
		supply motor P.C. board from the circuit board,
		turn on the power, and then measure the voltage
		between pins 3-4 of the cord-side connector.
		OK if same as wall outlet voltage
		After inspecting, turn off the power and insert
		connector P9.
	4880Q
4. Blown fuse		Remove fuses		F7 and	F8 and		check	the	Glass tube fuse
		continuity.							15A-250V
		OK if continuity
		(If there is no continuity, replace the fuse and
		then carry out the inspections in 5. )
5. Malfunction of power supply		Disconnect connector P17				(M-MOTOR) of the			Power supply motor P.C.
	motor P.C. board	main P.C. board, turn on the power, and then							board
		measure the voltages between the pins at the
		cord-side connector.
		OK if the voltages are as shown in the table
		below.
			Pin Nos.			Normal
			+ side	− side		voltage
			1	3		+5V
			2	4		+5V
			6	5		+24V
			7	5		+24V
		After measuring, turn off the power, wait 5
		minutes or more and then insert P14.
	5085Q
6.	Malfunction of main P.C. board	With connector		P17 (M-MOTOR) inserted				into	Main P.C. board
		the main P.C. board, turn on the power and then
		measure the voltages between the pins at the
		cord-side connector.
		OK if the voltages are as shown in the table
		below.
			Pin Nos.			Normal
			+ side	− side		voltage
			1	3		+5V
			2	4		+5V
			6	5		+24V
			7	5		+24V
		After measuring, turn off the power.
	5085Q
7.	Malfunction of panel P.C. board	Check that connector P1			(PANEL)		is inserted		Panel P.C. board
		into the main P.C. board,				and that	connector		Panel harness
		CN2 (MAIN) is inserted into the panel P.C.
		board.

BAS-311G, BAS-326G 125