Brother HL-1260 service manual Malfunction of control panel switches, Malfunction of buzzer

M-4

Malfunction of control panel switches.

Possible cause	Step	Check			Result	Remedy
Mis-operation	1	Are the switchs operated according to the			No	Operate the switches
		operation manual?				correctly following the
						operation manual.
Switch	2	When a switch is pressed,does the voltage of			Yes	Replace the Main PCB assy.
Control panel		the following signals change from 5V to 0V?
					No	Replace the control panel
PCB		Signal	Main PCB	Panel PCB
						unit or the switch flat cable.
		SW8(SEL)	P1-8	---P1-14
Switch flat cable		SW7(MODE/EMULATION)	P1-10	---P1-12
		SW6(FONT/ECONOMY)	P1-12	---P1-10
Main PCB		SW5(FORM FEED/FEEDER)	P1-14	--- P1-8
		SW4(SET/COPY)	P1-16	--- P1-6
		SW3(CONTINUE/SHIFT)	P1-18	--- P1-4
		SW2(DOWN/RESET)	P1-20	--- P1-2
		SW1(UP/TEST)	P1-21	--- P1-1

M-5

Malfunction of buzzer

Possible cause	Step	Check	Result	Remedy
Operational	1	Is the "Buzzer on mode "selected according	No	Set the buzzer on mode.
error		to the operation manual?
		(To alternate the buzzer on/off mode selection,
		press the MODE switch and select the
		"Advanced mode".)
Main PCB	2	Check the buzzer signal with a oscilloscope.	Yes	Replace the main PCB assy.
		Is the pulse of 4KHz output?
Buzzer			No	Replace the main PCB assy.

M-6

"12 COVER OPEN" is displayed even if the upper cover is closed

Possible cause	Step	Check	Result	Remedy
Upper cover	1	Does the upper cover hook press the actuator	No	Replace the upper cover assy.
Main PCB		of the interlock switch on the main PCB
		correctly when upper cover is closed?	Yes	Replace the main PCB assy.

VI - 2