M947

This document is a schematic diagram for the KI-IO INDICATOR DRIVER M947 module, produced by Digital Equipment Corporation.

Here's a summary of its key aspects:

• Purpose & Disclaimer: The schematic is provided for test and maintenance purposes only and contains proprietary information, copyrighted 1970 by Digital Equipment Corporation.

• Module Identification:

  • Title: KI-IO INDICATOR DRIVER M947
  • Number: M947-0-1, Revision B
  • Drawn by: Nancy Moore
  • Date: May 18, 1970

• Circuit Components:

  • The circuit primarily consists of 24 transistors (Q1-Q24) and 24 capacitors (C1-C24), along with two diodes (D1, D2).
  • General Specifications: Unless otherwise indicated, capacitors are 470pF, 100V, ±5%, and transistors are DEC6531B.
  • A Transistor & Diode Conversion Chart indicates that DEC6531B transistors can be cross-referenced with MPS6531 (EIA).

• Physical Layout Indication: The schematic shows connections grouped by "FA" and "FB".

  • "FA" refers to connections on the "ETCH SIDE OF M947; COMPONENT SIDE OF M948".
  • "FB" refers to connections on the "COMPONENT SIDE OF M947; ETCH SIDE OF M948". This suggests a multi-layer or multi-board assembly.

• Parts List: Confirms the use of:

  • 24 Transistors (DEC 6531B)
  • 24 Capacitors (470 PF 100V 5%)
  • 1 Etched Circuit Board (M947)
  • It also references related documents such as Module ECO History, Assembly/Drilling Hole Layout, and X-Y Coordinate Hole Location.