Ricoh FW780 Service Manual

Safety guidelines for preventing physical harm during operation and maintenance.

Precautions for handling toner and developer to avoid health risks.

Guidelines for safe installation and maintenance by trained representatives.

Technical details including configuration, copy speed, size, power, and dimensions.

Illustrates the path paper takes from input to output.

Explains the seven stages of image creation on the drum, from charging to quenching.

A diagram showing the arrangement of major mechanical parts within the machine.

Describes the properties of the organic photoconductor (OPC) drum and its sensitivity to light.

Explains the drive mechanism for the OPC drum, including gears and belt connections.

Describes the exposure process, including the role of the exposure lamp, fiber optics, and registration sensors.

Explains the basic operation of feeding paper and originals, including sensor activation and timing.

Explains the development process, including the roles of the paddle roller, development roller, and doctor blade.

Details how the toner supply amount is determined based on TS level and copy conditions.

Explains the function of the pre-transfer lamp in reducing drum potential for easier transfer.

Describes the paper separation process using AC corona and pick-off pawls.

Describes the drum cleaning process using a counter blade system and toner collection.

Explains the used toner overflow sensor and switch functions.

Details the fusing unit components, temperature settings, and exit rollers.

Explains the circuit operation for controlling fusing temperature.

Specifies environmental conditions for machine installation, including temperature, humidity, and dust levels.

Step-by-step instructions for installing the copier, including accessory checks.

A schedule detailing maintenance tasks (inspect, clean, replace) at specific mileage intervals.

Details the regular preventive maintenance procedures to be performed at set intervals.

Identifies key test points on the Main Board and Power Packs for diagnostic checks.

Explains how to access and navigate the Service Program (SP) mode for checks and adjustments.

A table listing jam codes, their causes, and corresponding Service Program (SP) mode numbers.

Instructions for removing and replacing the machine's outer covers, including side and rear covers.

Detailed procedure for removing the development unit, including accessory checks and cautions.

Step-by-step guide for safely removing the drum unit, including timing belt and connector disconnection.

Procedure to adjust the light sensor to maintain correct light intensity for optimal copy density.

Procedure to adjust the development bias voltage for image density control.

Troubleshooting steps for addressing issues with low image density, checking paper, toner, and sensors.

Troubleshooting steps for resolving dirty background issues on copies.

Lists specific service call codes (SC codes) and their definitions for common errors.

Definition and points to check for Exposure Lamp Abnormal (SC Code E-1).

Explains the basic operation of the roll feed unit, including paper feeding and cutting.

Instructions for replacing the cutter unit of the roll feeder.

Instructions for adjusting the paper cut length to correct errors.

Information regarding updates to the parts catalog, including part number changes.

Details on modifications made to meet Energy Star requirements, including auto-off mode.

Critical safety warnings to prevent injury during machine handling and servicing.

Precautions for handling toner and developer to avoid health risks.

Detailed technical specifications for the A251/A252 copiers.

Illustrates the paper path for A251/A252 copier models.

Diagram and list of mechanical components for A251/A252 models.

Specifies conditions for installing A251/A252 copiers, including environment and space.

Step-by-step instructions for installing the A251/A252 copier.

Lists service tools and provides access procedures for Service Program Mode.

Describes how to check the status of electrical components and perform output checks.

A table listing jam codes, causes, and remarks for A251/A252 copiers.

Covers the replacement and adjustment procedures for optical components.

Procedures for removing and replacing the drum unit on A251/A252 models.

Lists specific service call codes (SC codes) and their definitions for A251/A252 models.

Definition and points to check for Exposure Lamp Abnormal (SC Code E-1).

Detailed technical specifications for the B047/B048 copiers.

Illustrates the paper path for B047/B048 copier models.

Specifies conditions for installing B047/B048 copiers, including environment and space.

Step-by-step instructions for installing the B047/B048 copier.

Lists service tools and provides access procedures for Service Program Mode.

Explains how to access and use the Service Program mode for B047/B048 copiers.

A table listing jam codes, causes, and remarks for B047/B048 copiers.

Procedures for removing and replacing the drum unit on B047/B048 models.

Procedures for servicing the fusing unit on B047/B048 models, including removal.

Lists specific service call codes (SC codes) and their definitions for B047/B048 models.

Definition and points to check for Exposure Lamp Abnormal (SC Code E-1).

Technical specifications for the Roll Feed Unit B435/B436.

Describes the mechanical operation and basic functions of the roll feed unit.

Instructions for replacing the cutter unit of the roll feeder.

Instructions for adjusting the paper cut length to correct errors.

Information regarding updates to the parts catalog, including part number changes.

Details on modifications made to meet Energy Star requirements, including auto-off mode.