TechMan Feb80

This document is the BK7B1E/F Disk Drive Technical Manual, intended for customer engineers and other technical personnel involved in maintaining these Storage Module Drives (SMDs).

The manual provides comprehensive information across several key areas:

1. General Description: Introduces the BK7B1E/F disk drives as high-speed, random-access digital data storage devices with a 300 megabyte capacity. It covers the drive's major functional areas (e.g., power system, interface, seeking, reading, writing), physical characteristics (assemblies, logic, and circuitry), and how to identify specific equipment configurations using plates and FCO logs.

2. Operation: Details the procedures for operating the disk drive. This includes explaining the various controls and indicators (operator and power supply control panels), and providing instructions for disk pack storage, handling, inspection, cleaning, installation, removal, and power-on/off sequences.

3. Theory of Operation: Offers an in-depth explanation of the drive's internal workings. This section delves into:

   • Power System Functions: How power is supplied, distributed, and managed, including sequences for power-on, power-off, and emergency retract.
   • Electromechanical Functions: Descriptions of disk pack rotation, head positioning (actuator, magnet, air flow, head loading/unloading), and drive cooling.
   • Interface Functions: The communication lines and signal processing between the drive and its controller.
   • Seek Functions: How heads are positioned over desired data tracks, covering direct seeks, load seeks, and return-to-zero seeks.
   • Servo Disk Information: The prerecorded data on the disk's servo surface used for precise head positioning and clock generation.
   • Read/Write Functions: The principles and circuits involved in writing and reading data, including Modified Frequency Modulation (MFM) recording, peak shift compensation, and fault detection during these operations.
   • Fault and Error Conditions: Details various errors the drive can detect, how they are indicated, and how they affect drive operation.

4. Microcircuits: Provides detailed technical information on the integrated circuits (ICs) used in the drive. This includes:

   • General Theory: Characteristics and operational theory of Transistor-Transistor Logic (TTL), Emitter-Coupled Logic (ECL), Complementary Metal-Oxide Semiconductor (CMOS), and Operational Amplifiers, along with their packaging.
   • Logic Symbology: Explains the MIL STD 806-B/C logic symbols, modifiers, and indicators used in the manual's diagrams.
   • Data Sheets: A list and interpretation guide for individual data sheets of the specific microcircuits employed.

In essence, the document serves as a comprehensive hardware reference manual for understanding, operating, and troubleshooting the BK7B1E/F disk drive system.