HP 7475a - Page 5

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Section I

Model 7475A

7475-A-1-1

Figure

1-1.

Model 7475A

1-0

Main Page

Table of Contents2
Igeneral Information6
Introduction6
Specifications6
Safety Considerations6
Plotters Covered by Manual6
Operating and Performance6
Description7
Line Voltage and Fuse Selection7
Grounding Requirements8
Options8
Accessories Supplied8
Recommended Test Equipment8
Top Case Removal8
Line Voltage Selection9
Power Cord Configurations10
Packaging for Shipment11
Recommended Test Equipment11
Test12
Introduction12
Rear Panel Switches12
Basic Operating Test12
Hewlett-Packard Graphics Language13
Demonstration Plot13
Test Program13
Repeatability13
Pl and P2 Button and Power Switch Locations14
Test Program17
Repeatability Test Points21
Adjustments22
Introduction22
Replaceable Parts23
Introduction23
Exchange Assemblies23
Replaceable Parts Lists23
Ordering Information23
Code List of Manufacturers23
Designations and Abbreviations23
Model 7475A Exploded View31
Pen Carousel Parts32
Reference Designations and Abbreviations34
Product History36
Introduction36
History of Assemblies by Serial Prefix Number36
History of Printed Circuit36
Assemblies36
Item Description36
Date Codes37
Service40
Introduction40
Simplified Theory of Operation40
7475A Simplified Block Diagram40
HP-IB Interface (Option 002)41
RS-232-C/CCITT V.24 Interface Circuits42
HP-IB Interface Circuits and Handshake43
Microprocessor Circuit44
Read Only Memory Circuit44
Random Access Memory Circuit44
Gate Arrays a and B44
Pen Carousel44
Motor Servo Systems44
Quadrature Waveforms44
Motor Supply Sensor Circuit45
Motor Servo System Block45
Motor Current Sensor Circuit46
Pen down Circuit46
Power Supplies46
Recommended Test Equipment46
Troubleshooting46
Exchange Printed Circuit Assembly46
Drive Motors and Pen Solenoid46
Troubleshooting Table47
Test a47
Testb47
Part Removal and Replacement48
Top Case Removal48
Pen Carousel Housing Removal48
Pen Carousel Cable48
Paper Drive Motor Assembly Removal49
Pen Carousel Housing49
Paper Drive Motor and Solenoid Cables49
Paper Drive Motor Clamp and Pen Drop Shield49
Pen Solenoid50
Pen Drive Motor and Belt50
Pen Carriage, Penholder, and Damper Removal52
Pen Carriage52
Pinch Rollers Removal and Replacement53
Chassis Assembly Removal53
Removal54
Pinch Roller Mechanism Removal54
Paper Drive Shaft and Coupler54
Pinch Rollers54
Underside of Chassis Assembly54
Power Module and Transformer55
Model 7475A55
Power Module Removal55
Power Module Wiring56
Diagram57
Schematic Diagram Notes57
RS-232-C, Option 001 Schematic Diagram65
HP-IB, Option 002 Schematic Diagram67
Power Supply, Schematic Diagram69

HP 7475a - Page 5

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