Which document contains step-by-step instructions for testing equipment?

The correct answer is the troubleshooting chart because it is specifically designed to provide step-by-step instructions for diagnosing and resolving issues with equipment. A troubleshooting chart typically includes systematic procedures that guide the technician through identifying problems, testing specific components, and determining the appropriate course of action based on the results.

In contrast, a maintenance manual primarily provides guidelines for routine care and upkeep of equipment, rather than detailed fault diagnosis and resolution steps. An installation guide focuses on the proper procedures for setting up equipment for the first time, which might not include troubleshooting steps for ongoing operational issues. A repair log is a record of issues that have been fixed and the work performed, but it does not provide instructional content for testing or troubleshooting current problems.