33 Typing Unit

This document outlines the procedures for the disassembly and reassembly of the Teletype 33 Typing Unit. Key instructions and information provided include:

• General Procedures: Information on viewing the unit, safety precautions (specifically disconnecting power sources before maintenance), and the proper method for removing spring steel retaining rings.
• Maintenance: Guidelines for using standard tools (as defined in section 570-005-800TC) and instructions for replacing damaged or worn components.
• Disassembly/Reassembly: Detailed step-by-step procedures for removing and replacing the unit's major mechanisms, including:
  • Ribbon mechanism
  • Carriage mechanism and carriage drive bail
  • Codebar mechanism and codebar reset bail
  • Spacing mechanisms (pawl and drum)
  • Function mechanisms (lever, rocker shaft, and box)
  • Platen mechanism (both friction and sprocket feed variations)
  • Form-out mechanism
  • Trip shaft mechanism
  • Selector mechanism
  • Main shaft mechanism
  • Motor

The document contains illustrations and "front/rear view" diagrams to assist in identifying part locations and orientation during the disassembly process. Note: The manual explicitly references other sections (e.g., 574-100-702TC) for removing the typing unit from its set.