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Order Number: EK-TPS20-SG

/ Hardware / Infrastructure / Print Servers / PrintServer 20

This document is the Service Guide for the Digital Equipment Corporation PrintServer 20 and turbo PrintServer 20 laser printers, published in May 1991.

Primarily intended for trained Customer Services engineers, its main purpose is to provide hardware repair and maintenance procedures. The core maintenance philosophy involves isolating problems to failing Field Replaceable Units (FRUs) and replacing them, aided by on-board diagnostics.

The guide covers:

Printer Description & Maintenance Philosophy: Overview of the printers, their design for modular FRU replacement, and essential safety considerations (laser, ozone).
System Operation: Details of the power-up, self-test, and bootstrap processes.
User Interface & Diagnostics: Explains the operator panel switches, indicators, and the use of "Field Test Mode" and "Query Mode" for diagnostics, testing components, and retrieving status information.
Error Messages: Definitions and formats for operational, diagnostic, interlock, and tray-related error messages displayed by the printer.
Fault Isolation Procedures (FIPs): Comprehensive troubleshooting flowcharts and tables to diagnose and resolve various hardware issues, including power problems, motor errors, fuser issues, cover interlock errors, and paper jams.
Print Quality Troubleshooting: Identifies symptoms of common print quality defects (e.g., density issues, lines, spots, image distortion, paper damage) and provides FIPs for their resolution.
FRU Removal and Replacement: Step-by-step instructions for safely removing and installing various printer components.
300K Maintenance: Procedures for scheduled preventive maintenance, including cleaning and replacement of specific components like the fusing unit, development unit, and rollers.
Total Call Concept (TCC): Outlines Digital's service philosophy emphasizing comprehensive preventative maintenance during a service call to improve reliability.