MP00622 MF20 Oct82

This document is a "Field Maintenance Print Set" (Part No. MPBB622-00) for the Digital Equipment Corporation's MF20 series of MOS memory systems. It provides comprehensive technical information for various MF20 unit variations (e.g., MF20-LA, -LB, -LC, -LD, -LH, -LJ, -LM, -LN, -LP, -LR, -LS, -LT, -LU, -LV, -AC, -AD).

The print set is structured as a detailed table of contents, leading to various modules and engineering specifications. Its content includes:

• Module Descriptions: Detailed breakdowns of core components such as MOS Memory, Syndrome (error detection/correction), MOS Control, Write Path, Address and Time logic, MOS Storage, Dual Translators, and XBUS Translators. Each module section often includes logic schematics, power/grounding details, and terminators.
• System Overviews & Layouts: Module utilization lists, module location charts (detailing configurations for cache/no-cache, channel/no-channel variations), and cable diagrams (illustrating interconnections between the CPU, master oscillator, XBUS terminator, power supply, and battery box).
• Functional Diagrams: Flowcharts for read, write, refresh, and diagnostic cycles, along with various timing diagrams.
• Engineering Specifications & Procedures: Extensive text-based instructions for:
  • MF20 system installation, including mounting holes, module placement, and hardware requirements.
  • Sbus clock synchronization and deskew adjustment.
  • Diagnostic routines and troubleshooting steps.
  • Voltage checks and power supply adjustments.
  • Cabling and wiring procedures.
  • Parts lists for installation kits and individual components.

The document is designed to guide field service personnel through the installation, maintenance, and troubleshooting of the MF20 memory systems, addressing both hardware configurations and operational checks.