Unlike consumer printers, the 7435 has a hidden service menu. The manual details how to navigate to dC301 (Component Control) to test if a specific motor is seized or if a clutch is engaging.
A service manual is a comprehensive guide that provides detailed instructions and technical information for repairing, maintaining, and troubleshooting a device, in this case, the Xerox 7435 printer. xerox 7435 service manual