A professional who tends phototypesetting machine and photo processor that print and develop proof of phototypesetting type disk in disk manufacturing establishment. Responsibilities include:

• Selects roll of programmed tape from file, secures roll onto reel of phototypesetting machine, and threads tape through machine rollers and into reader to prepare machine for automatic operation.
• Cleans dust and lint from disk and places disk in phototypesetting machine.
• Depresses keys to enter command codes for projection of type images from type disk onto film cassette in photo unit of machine and onto screen of cathode ray tube.
• Scans images on screen to detect type defects and notifies supervisor, type-disk quality control of irregularities.
• Removes film cassette from machine, places cassette on receiving platform of photo processor, and depresses switch to begin developing cycle.
• Depresses switch to stop machine when runoff (proofsheet) emerges.
• Removes disk from phototypesetting machine, and places disk and runoff in specified storage area.