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HP 7475A Service Manual

Graphics plotter

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Operation and interconnection manual (101 pages)

Table Of Contents

Table of Contents

Table of Contents
Igeneral Information
Introduction
Specifications
Safety Considerations
Plotters Covered by Manual
Operating and Performance
Description
Line Voltage and Fuse Selection
Grounding Requirements
Options
Accessories Supplied
Recommended Test Equipment
Top Case Removal
Line Voltage Selection
Power Cord Configurations
Packaging for Shipment
Recommended Test Equipment
Test
Introduction
Rear Panel Switches
Basic Operating Test
Hewlett-Packard Graphics Language
Demonstration Plot
Test Program
Repeatability
Pl and P2 Button and Power Switch Locations
Test Program
Repeatability Test Points
Adjustments
Introduction
Replaceable Parts
Introduction
Exchange Assemblies
Replaceable Parts Lists
Ordering Information
Code List of Manufacturers
Designations and Abbreviations
Model 7475A Exploded View
Pen Carousel Parts
Reference Designations and Abbreviations
Product History
Introduction
History of Assemblies by Serial Prefix Number
History of Printed Circuit
Assemblies
Item Description
Date Codes
Service
Introduction
Simplified Theory of Operation
7475A Simplified Block Diagram
HP-IB Interface (Option 002)
RS-232-C/CCITT V.24 Interface Circuits
HP-IB Interface Circuits and Handshake
Microprocessor Circuit
Read Only Memory Circuit
Random Access Memory Circuit
Gate Arrays a and B
Pen Carousel
Motor Servo Systems
Quadrature Waveforms
Motor Supply Sensor Circuit
Motor Servo System Block
Motor Current Sensor Circuit
Pen down Circuit
Power Supplies
Recommended Test Equipment
Troubleshooting
Exchange Printed Circuit Assembly
Drive Motors and Pen Solenoid
Troubleshooting Table
Test a
Testb
Part Removal and Replacement
Top Case Removal
Pen Carousel Housing Removal
Pen Carousel Cable
Paper Drive Motor Assembly Removal
Pen Carousel Housing
Paper Drive Motor and Solenoid Cables
Paper Drive Motor Clamp and Pen Drop Shield
Pen Solenoid
Pen Drive Motor and Belt
Pen Carriage, Penholder, and Damper Removal
Pen Carriage
Pinch Rollers Removal and Replacement
Chassis Assembly Removal
Removal
Pinch Roller Mechanism Removal
Paper Drive Shaft and Coupler
Pinch Rollers
Underside of Chassis Assembly
Power Module and Transformer
Model 7475A
Power Module Removal
Power Module Wiring
Diagram
Schematic Diagram Notes
RS-232-C, Option 001 Schematic Diagram
HP-IB, Option 002 Schematic Diagram
Power Supply, Schematic Diagram

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SERVICE MANUAL

HP 7475A

GRAPHICS PLOTTER

SERIAL NUMBERS

This manual applies directly to plotters

with serial numbers prefixed 2541 V.

For additional important information about

serial numbers, see PLOTTERS COVERED

BY MANUAL in Section I.

16399

W. BERNARDO DRIVE, SAN DIEGO, CA~IFORNIA

92127-1899

MANUAL PART NO.

07475-90000

Printed: AUGUST

1987

Table of Contents

HP 7475A Service Manual

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Troubleshooting

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