Read Sharp MX-LCX4 Service Manual online
MX-LCX4 DETAILED DESCRIPTIONS 4 – 2
2. Paper lift
A. Tray detection
When a tray is set in the machine, the tray detection method used
depends on the tray:
• The upper tray and middle tray are detected when any one of the
depends on the tray:
• The upper tray and middle tray are detected when any one of the
paper size switch signals is low.
• The lower tray is detected when the switch 1 signal of the paper
size switch is low.
B. Lift mechanism
When the machine detects that the paper tray is set in the machine,
the tray lift motor [A] rotates and the coupling gear [B] on the tray lift
motor engages the pin [C] of the lift drive shaft [D]. The tray drive
belts [E] are connected to the tray bottom plate [F] and are driven
by the tray lift motor via the lift drive shaft [D] and tray drive pulleys
[G]. When the lift motor turns counterclockwise, the tray bottom
plate [F] moves up. The tray goes up until the top of the paper stack
pushes up the pick-up roller and the lift sensor in the feed unit is
de-activated.
When the actuator [H] on the rear end of the bottom plate activates
the paper height sensors [I], the remaining paper capacity is
detected. (see 4.)
When pulling out the tray, the coupling gear [B] separates from the
pin [C], so that the tray bottom plate moves downward. In the bot-
tom tray, the damper [J] lets the tray bottom plate drop slowly.
the tray lift motor [A] rotates and the coupling gear [B] on the tray lift
motor engages the pin [C] of the lift drive shaft [D]. The tray drive
belts [E] are connected to the tray bottom plate [F] and are driven
by the tray lift motor via the lift drive shaft [D] and tray drive pulleys
[G]. When the lift motor turns counterclockwise, the tray bottom
plate [F] moves up. The tray goes up until the top of the paper stack
pushes up the pick-up roller and the lift sensor in the feed unit is
de-activated.
When the actuator [H] on the rear end of the bottom plate activates
the paper height sensors [I], the remaining paper capacity is
detected. (see 4.)
When pulling out the tray, the coupling gear [B] separates from the
pin [C], so that the tray bottom plate moves downward. In the bot-
tom tray, the damper [J] lets the tray bottom plate drop slowly.
C. Lift sensor
When the lift motor turns on, the pick-up solenoid [A] activates to
lower the pick-up roller [B]. When the top sheet of paper reaches
the proper paper feed level, the paper pushes up the pick-up roller
and the actuator [C] on the pick-up roller supporter [D] de-activates
the lift sensor [E] to stop the lift motor.
After several paper feeds, the paper level gradually lowers, then
the lift sensor is activated and the lift motor turns on again until the
lift sensor is de-activated again.
lower the pick-up roller [B]. When the top sheet of paper reaches
the proper paper feed level, the paper pushes up the pick-up roller
and the actuator [C] on the pick-up roller supporter [D] de-activates
the lift sensor [E] to stop the lift motor.
After several paper feeds, the paper level gradually lowers, then
the lift sensor is activated and the lift motor turns on again until the
lift sensor is de-activated again.
3. Paper size detection
A. Top tray (tray 4) and middle tray (tray 5)
For the top and middle trays, the paper size switch [A] detects the
paper size. The paper size switch contains three microswitches.
The paper size switch is actuated by an actuator plate [B] at the
rear of the tray. Each paper size has its own unique combination as
shown in the table and the CPU determines the paper size by the
combination.
paper size. The paper size switch contains three microswitches.
The paper size switch is actuated by an actuator plate [B] at the
rear of the tray. Each paper size has its own unique combination as
shown in the table and the CPU determines the paper size by the
combination.
B. Bottom tray (tray 6)
The bottom tray has the same switch as the top and middle trays.
However, it is only used for detecting when the tray is pushed in.
For the bottom tray, the paper size must be selected in the SP5019-
007:
However, it is only used for detecting when the tray is pushed in.
For the bottom tray, the paper size must be selected in the SP5019-
007:
[F]
[A]
[E]
[J]
[D]
[E]
[C]
[B]
[G]
[H]
[I]
A4-
LEF
B5-
LEF
A5-
LEF
A5-
SEF
LT-
LEF
HLT-
LEF
HTL-
SEF
SW1
0
1
0
0
0
1
1
SW2
1
0
1
0
0
0
1
SW3
1
1
0
1
0
0
0
1: HI 0: LOW
[A]
[E]
[D]
[C]
[B]
[A]
[B]
2
1
3
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