Read Sharp MX-GB50A (serv.man3) Service Manual online
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For the SmartPunch to operate, all optical sensors must be clear. Any blocked sensor or open door
will prevent operation. The machine may operate in bypass mode with or without a chip tray or die
set. Both of these must be present to punch.
will prevent operation. The machine may operate in bypass mode with or without a chip tray or die
set. Both of these must be present to punch.
Stepper #1 Control:
If punch is not enabled, the SmartPunch will run in bypass mode (no punching). Either the printer or
the first sheet entering the machine will turn on both stepper motors. The time is measured for the
leading edge of the first sheet to pass sensor 8. Knowing the distance between sensors and the time
it takes for the sheet to pass both sensors, we can determine the speed of the paper. The time is
compared to a list and Stepper 1 and stepper 2 are adjusted to closely match the incoming speed.
the first sheet entering the machine will turn on both stepper motors. The time is measured for the
leading edge of the first sheet to pass sensor 8. Knowing the distance between sensors and the time
it takes for the sheet to pass both sensors, we can determine the speed of the paper. The time is
compared to a list and Stepper 1 and stepper 2 are adjusted to closely match the incoming speed.
If the punch is enabled, the backstop is raised, the brake is engaged, and both the transport and
punch motors are started. Also, the divert solenoid is activated to direct the sheets into the punch
path. As above, the input speed is measured, this time using Sensor 1 and 2. Stepper 1 is adjusted
to meet the measured input speed; Stepper 2 is accelerated to the speed of the transport motor.
Sensor 2 now delays for a time period based on the input speed to ensure that the sheet has cleared
the printer exit roller. After this delay, stepper 1 accelerates the sheet to match the transport speed.
19 msec after the sheet’s trailing edge passes sensor 2, Stepper 1 is decelerated to match the
previously measured input speed.
punch motors are started. Also, the divert solenoid is activated to direct the sheets into the punch
path. As above, the input speed is measured, this time using Sensor 1 and 2. Stepper 1 is adjusted
to meet the measured input speed; Stepper 2 is accelerated to the speed of the transport motor.
Sensor 2 now delays for a time period based on the input speed to ensure that the sheet has cleared
the printer exit roller. After this delay, stepper 1 accelerates the sheet to match the transport speed.
19 msec after the sheet’s trailing edge passes sensor 2, Stepper 1 is decelerated to match the
previously measured input speed.
Punch Control:
The punch cycle begins 40 msec after the leading edge of the sheet reaches Sensor 3. The brake is
released, and the clutch is engaged. Sensor 9 now looks for the leading edge of its flag, and when
seen, the clutch is disengaged, and the backstop is lowered. When the trailing edge of the flag is
seen, the brake is engaged. When Sensor 3 sees the trailing edge of the sheet, the backstop is
raised.
released, and the clutch is engaged. Sensor 9 now looks for the leading edge of its flag, and when
seen, the clutch is disengaged, and the backstop is lowered. When the trailing edge of the flag is
seen, the brake is engaged. When Sensor 3 sees the trailing edge of the sheet, the backstop is
raised.
Stepper #2 Control:
72 msec after the leading edge of the sheet passes Sensor 6, Stepper 2 is decelerated to match the
measured input speed from the printer. This delay ensures that the sheet exits from the transport
rollers. When the trailing edge of the sheet passes Sensor 6, Stepper 2 is accelerated to match the
speed of the transport motor.
measured input speed from the printer. This delay ensures that the sheet exits from the transport
rollers. When the trailing edge of the sheet passes Sensor 6, Stepper 2 is accelerated to match the
speed of the transport motor.
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