Brother BAS-311G service manual Electrical Mechanism, Work clamp does not rise, 4888Q

8. ELECTRICAL MECHANISM

Problem		#9	When the foot switch is depressed, an error code is displayed.
			Cause		Inspection/Remedy/Adjustment	Replacement if a malfunction
3. If the work clamp moves slightly				1)	Check that connector P5 (P-ENC) is inserted	Pulse motor P assembly
	and then [E300] is displayed,				into the main P.C. board.
	there is a malfunction of the			2)	Check the encoder input while referring to
	encoder.				“2-8. Input checking method”.
4.	If the work clamp operates and			1)	Check that connector P8 (SENSOR1) is	Work clamp home position
	[E300] is displayed, there is a				inserted into the main P.C. board.	sensor
	malfunction of the work clamp			2)	Check the work clamp home position sensor
	home position sensor.				input while referring to “2-8. Input checking
					method”.
				3)	If a metallic object is brought close to the
					work clamp home position sensor and the
					LED inside the sensor does not illuminate,
					there is a malfunction of the sensor.
				4)	If it illuminates, the home position dog is
					incorrectly adjusted.
					Switch to home position adjustment mode,
					and adjust the position of the home position
					dog. (Refer to “7-20. Adjusting the home
					position”.)
5. If the work clamp does not move				1)	Disconnect connector P3 (PPM) from the	Pulse motor P assembly
	and [E300] is displayed, there is				PMD P.C. board, and measure the resistance
	a malfunction of the pulse motor				between pins 1-2 and 3-4 at the cord-side
	or cord.				connector.
					OK if 2-3 Ω
					After measuring, insert P3.	PMD P.C. board
				2)	If 1) is OK, there is a malfunction of the PMD
					P.C. board.
			4888Q
Problem		#10	CF media indicator does not illuminate.
			Cause		Inspection/Remedy/Adjustment	Replacement if a malfunction
1.	Incorrectly inserted			1)	Check the insertion direction of the CF card.
					(The side with the projection should be at the
					left.)
				2)	Check the insertion of the CF card.
2.	CF card incorrectly formatted.			Check the format of the CF card.
				(Use 16-sector formatting.)
3.	Malfunction of CF card			Use a computer to check whether the contents of
				the CF card can be read.
Problem		#11	Work clamp does not rise.
			Cause		Inspection/Remedy/Adjustment	Replacement if a malfunction
1. Incorrect			work clamp home	Adjust the home position while referring to “7-20.
	position adjustment			Adjusting the home position”.
2.	Incorrect mechanism adjustment			Check if the movement of the work clamp arm is		Work clamp arm assembly
				stiff.

130 BAS-311G, BAS-326G