Brother HL 2060 - B/W Laser Printer Service Manual page 94

M-4 Malfunction of control panel switches
Possible cause Step
Mis-operation 1
Switch 2
Control panel
PCB
Switch flat cable
Main PCB
M-5 "12 COVER OPEN " is displayed even if the upper cover is closed
Possible cause Step
Upper cover 1
Main PCB
M-6 "CHECK XX TRAY" is displayed even if a paper-loaded cassette is mounted
(or even if a paper is set on MP tray) XX is MP/T1/T2
Possible cause Step
Mis-operation 1
Actuator 2
Paper empty 3
sensor
Feed flat cable
Paper feed flat 4
cable
Main PCB
Check
Are the switches operated according to the
operation manual?
When a switch is pressed, does the voltage of
the following signals change from 5V to 0V?
Signal
SW8(SEL)
SW7(MODE/EMULATION)
SW6(FONT/ECONOMY)
SW5(FORM FEED/FEEDER)
SW4(SET/COPY)
SW3(CONTINUE/SHIFT)
SW2(DOWN/RESET)
SW1(UP/TEST)
Check
Does the upper cover hook press the actuator
of the interlock switch on the main PCB
correctly when upper cover is closed?
Check
Is the paper feed mode set correctly?
Does the actuator for the paper empty sensor
operate smoothly?
Does the voltage of P5-3 (or P5-14) in the
Paper feeder PCB connector rise from 0V to
5V when the paper empty sensor is covered?
Does the voltage of P3-3 (or P3-14) in the
main PCB connector rise from 0V to 5V when
the paper empty sensor is covered?
Main PCB Panel PCB
P1-7 P1-7
P1-19 P1-19
P1-9 P1-9
P1-5 P1-5
P1-15 P1-15
P1-17 P1-17
P1-13 P1-13
P1-11 P1-11
VI-12
Result Remedy
No Operate the switches
correctly following the
operation manual.
Yes Replace the Main PCB
assy.
No Replace the control panel
unit or the switch flat
cable.
Result Remedy
No Replace the upper cover
assy.
Yes Replace the main PCB
assy.
Result Remedy
No Set paper feed mode
correctly.
No Reassemble or replace
the actuator.
No Replace the paper
feed/size-sw PCB assy or
feed flat cable.
No Replace the feed flat
cable.
Yes Replace the main PCB
assy.