Brother BAS-311G service manual Electrical Mechanism, 5086Q, 5087Q

					8. ELECTRICAL MECHANISM
Problem	#4		Panel keys do not work.
			Cause	Inspection/Remedy/Adjustment	Replacement if a malfunction
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.
Problem	#5		The work clamp does not return to the home position when the foot switch is depressed.
			Cause	Inspection/Remedy/Adjustment	Replacement if a malfunction
1. Malfunction of treadle unit				With connector P6 (FOOT) inserted into the main	Treadle unit
				P.C. board, turn on the power and then measure
				the voltages between pins 2-3 at the cord-side
				connector. (No. 2 +, No. 3 −)
				OK if the voltage is approximately 2 V at neutral
				and approximately 4 V when the foot switch is
				depressed as far as it will go.
			5086Q
2. Malfunction of two-pedal foot				Disconnect connector P6 (FOOT) from the main	Foot switch
switch				P.C. board, and check the continuity between	Foot switch cord assembly
				pins 5-6, 7-8 and 8-9 at the cord-side connector.
				OK if normally ∞ Ω, and 0 Ω when the foot switch
				is depressed.
Work clamp		Work Start
(Second		clamp
position)			5087Q
Problem	#6		Home position is incorrect.
			Cause	Inspection/Remedy/Adjustment	Replacement if a malfunction
Incorrect home position adjustment				Switch to home position adjustment mode, and
				adjust the position of the home position dog.
				(Refer to “7-20. Adjusting the home position”.)

BAS-311G, BAS-326G 127