Craden Peripherals Craden DP9 User Manual
Page 4
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