Craden Craden DP9 DP9 DP9, Technical Manual

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3.13.6 Ribbon Smear 20
3.13.7 Erratic Document Feed, Mispositioning or Overprinting 20
3.13.8 Rollers Run at Power-Up or After Document Ejected 20
3.13.9 Erratic Character Spacing or Carriage Hitting End Stops 20
3.13.10 Interface Inoperative 20
4.0 THEORY OF OPERATION
4.1 OVERVIEW 21
4.1.1 Carriage Drive Assembly 21
4.1.2 Document Drive Assembly 21
4.1.3 Switching Power Supply 21
4.1.4 Main Printed Circuit Board 22
4.1.5 Keypad/Display Assembly 22
4.2 ELECTRONICS IN DETAIL
4.2.1
Low Voltage Supplies 22
4.2.2 Microprocessor System 22
4.2.3 Stepper Motor Drivers 22
4.2.4 Printhead Drivers 25
4.2.5 Keypad and Display 25
4.2.6 Sensors 25
4.2.7 Character Printing 25
5.0 MAINTENANCE
5.1 LUBRICATION AND CLEANING
5.1.1
Lubrication 27
5.1.2 Document Feed Roller Cleaning 27
5.1.3 Sensor Cleaning 27
5.1.4 Printhead Cleaning 28
5.1.5 Document Print Area Cleaning 28
5.1.6 Cabinet Exterior Cleaning 28
5.2 SERVICE PARAMETER SET-UP PROCEDURE 29
5.3 ELECTRICAL ADJUSTMENTS 29
5.4 MECHANICAL ADJUSTMENTS
5.4.1
Printhead Gap 30
5.4.1.1 Ribbon Shield Removal/Replacement 31
5.4.1.1.1 Ribbon Shield Face Inspection 32
5.4.2 Carriage Drive Belt Tension 33
5.4.3 Document Drive Belt Tension 33
5.4.4 Carriage Shaft Cam and Shaft Rack 33
5.4.5 Rear Document Roller Spring Force 33
5.4.6 Auto Alignment Gate Ramp 34
5.4.7 Auto Alignment Gate Height 34
5.4.8 Front Document Roller Spring Force 35
5.4.9 Auto Alignment Skew Sensor Calibration 35
5.5 REPLACEMENT PROCEDURES
5.5.1
Cabinet 35
5.5.2 Main PCB 35
5.5.3 Sensor PCB 36
5.5.4 Keypad 36
5.5.5 Display 36
5.5.6 Power Supply PCB 36
5.5.7 Carriage Motor 36
5.5.8 Document Motor 37
5.5.9 Printhead 37
5.5.10 Carriage Drive Belt 37
5.5.11 Document Drive Belt 37