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5. TECHNICAL
TROUBLESHOOTING
5.1 THEORY OF OPERATION
The CANON Stream Punch is a machine that punches various die set hole patterns
into single sheets of paper. The machine is placed between a printer / copier and a
finisher. There are two paper paths. One is the bypass section, which does not
punch paper. The other is the punch path. The punch path can be selected by
pressing the green button on the top of the Stream Punch.
The Stream Punch consists of several input / output devices to operate the machine
functions. The system intelligence is a Microchip micro-controller PIC17C752. The
present code is written in Microchip assembler. The list of I/O devices is:
Refer to the electrical wiring information, when reading the following material.
INPUTS:
Sensor 1
Optical
Starts machine motors, Sheet speed measurement, Jam detect
Sensor 2
Optical
Stepper 1 control, Sheet speed measurement, Jam detect
Sensor 3
Optical
Punch mechanism control, Backstop raiser, Jam detect
Sensor 4
Optical
Jam detect at entrance of U-Channel
Sensor 5
Optical
Jam detect at exit of U-Channel
Sensor 6
Optical
Stepper 2 Control, Jam detect
Sensor 7
Optical
Exit sensor, Jam detect
Sensor 8
Optical
Bypass sensor, Sheet speed measurement, Jam detect
Sensor 9
Optical Vane Monitors rotation of punch mechanism, Controls clutch and brake
Switch 1
Keypad
Selects punch mode
Switch 2A Mechanical
Interlock Voltage, no machine movement if door is open
Switch 2B Mechanical
Door open signal
Switch 3
Mechanical
Chip tray switch
Switch 4
Mechanical
Die Set switch
OUTPUTS:
Diverter
DC Solenoid Diverts paper from bypass to punch sections
Brake
DC Brake
Stops the punch mechanism, keeps it in correct position
Clutch
DC Clutch
Clutches the punch mechanism to drive through paper
Backstop
DC Solenoid Provides stop for paper to rest against during punching
Transport AC Motor
Provides paper movement through machine
Punch
AC Motor
Provides power to punch the paper
Stepper 1 PWM Signal
Controls Stepper Motor 1
Winding
On / Off signal for stepper holding current
Stepper 2 PWM Signal
Controls Stepper Motor 2
Winding
On / Off signal for stepper holding current
PRINTER COMMUNICATION:
Punch
Input
Printer turns on Punch enabled mode (not presently
operational)
Motor
Input
Printer turns on Stream Punch Motor
Jam
Output
Punch signals a jam or the door is open (no operation
allowed)
Tray /
Die
Output
Punch indicates tray or die set missing (bypass only
allowed)
