Do you have a question about the Canon PC921 and is the answer not in the manual?
Information on parts requiring periodic replacement.
Details on parts designated as durable or consumable items.
Procedures and parts requiring scheduled maintenance.
Guidelines for storing and handling the machine's cartridge.
Procedures for mechanical settings and alignment.
Procedures for setting up and adjusting the Automatic Document Feeder.
Adjustments involving electronic components and PCBs.
Basic steps for tuning image quality.
Identification and function of sensors and solenoids.
Overview of the different switches used in the machine.
Identification of electrical components like lamps, heaters, and motors.
Identification and purpose of various PCBs.
Explains error codes and their causes for self-diagnosis.
Timing charts for copier and ADF operations.
List of signals and abbreviations used in the manual.
Schematic diagrams of the machine's electrical circuits.
Lists special tools, solvents, and oils for maintenance.
Details on machine specifications, performance, and ratios.