2004 Canon iR2270/iR2870/iR3570/iR4570 Factory Service Manual

• 876-page Canon factory service manual PDF, dated October 8, 2004, for the iR2270, iR2870, iR3570, and iR4570 series, with locality- and power-version differences identified throughout.
• Covers controller and imaging-system repair, from the main controller PCB, HDD, SDRAM, and Boot ROM to the reader controller, CIS, scanner motor, laser scanner, drum, developing assembly, hopper, toner-feed system, transfer roller, and high-voltage PCB, including the related post-replacement setup.
• Details the pickup, registration, duplex, delivery, and fixing systems, including cassette and manual-feed assemblies, rollers, clutches, solenoids, sensors, fixing film, pressure roller, drive motors, and the main drive assembly.
• Includes factory image-position, CIS, shading, laser, developing, drum/APVC, feeder-registration, paper-width, and controller-replacement adjustments, plus DISPLAY, I/O, ADJUST, FUNCTION, OPTION, TEST, and COUNTER service-mode references.
• Maps system configurations for Finisher-Q3, Saddle Finisher-Q4, Finisher-S1, punch units, 3 Way Unit-A1, DADF-N1, Side Paper Deck-Q1, 2-Cassette Pedestal-Y2, and print/fax/send/MEAP options, with model- and voltage-specific differences identified.
• Provides the Major PCB Wiring Diagram, accessory-specific paper-path drawings, scanner and image-formation timing charts, copy/Box/SEND/fax/PDL image-data flows, HDD shutdown flow, and image-fault/jam-code charts, backed by connector, check-pin, and power-supply reference data.

Factory Repair Coverage and System Organization

The manual is organized by functional block, and each major chapter combines operating theory with the removal, replacement, inspection, or adjustment work used in the field. The main-controller material explains HDD partitions, startup and shutdown, system software, and the image-data paths used for copy, Box, SEND, fax, and PDL printing before moving into board, memory, Boot ROM, and hard-drive replacement. The original-exposure section follows the reader motor, contact image sensor, original-size detection, and shading controls. Laser and image-formation chapters cover APC, scanner-motor and shutter control, APVC/ATVC stabilization, charging, developing, toner supply, transfer, and drum cleaning.

Paper handling is treated as an operating chain rather than a collection of isolated parts. The pickup/feeding chapter identifies rollers, sensors, drive routes, cassette and manual-feed control, registration, duplex operation, and jam-detection logic for the base machine and supported delivery configurations. The fixing chapter covers film-speed and temperature control, protective functions, paper-passage detection, and repair procedures for the fixing unit, film, pressure roller, cleaning roller, and related sensors.

Installation coverage goes beyond unpacking. It includes initial drum and toner setup, APVC correction, image-position adjustment, operational test prints, TCP/IP checks using remote-host, loopback, and local-host addresses, and installation material for the Card Reader-C1 and NE Controller-A1 where applicable. The manual separates iR2270/iR2870 and iR3570/iR4570 construction where the mechanisms differ, and it flags 100 V, 120 V, and 230 V option dependencies instead of treating every machine as the same configuration.

This is the core machine service manual, not the separate illustrated parts catalog. It maps finishers, punchers, DADF, paper decks, heater kits, and print/transmission options and supplies related jam, alarm, and error-code coverage. Full internal repair or installation coverage for every accessory is not part of this core book; several option configurations point to separate installation procedures.

Electrical Diagnostics, Service Mode, and Maintenance Data

Electrical fault isolation is built around the machine's actual signal and power paths. The manual traces power distribution through the printer and reader units, gives rated-output tables for the printer, controller, accessory, and All-Night power-supply PCBs, maps major PCB connectors, and identifies field-relevant variable resistors, LEDs, check pins, clutches, solenoids, motors, fans, sensors, switches, lamps, heaters, and boards. Service mode covers status display, DC-CON/R-CON/FEEDER/SORTER I/O, adjustments, component operation and inspection, machine options, test prints, and counters.

Self-diagnosis includes main-unit error codes, detailed E602 coverage, SEND errors, printer/finisher/ADF jam codes, alarm codes, and finisher, puncher, and DADF faults. The faulty-image chapter works through uneven density, blank or streaked output, smudging, ghosting, no-power conditions, and abnormal noise, with component-location references that help connect a symptom to the responsible sensor, load, PCB, or mechanical path.

Scheduled-service material identifies periodically replaced parts, durables, consumables, cleaning points, inspection criteria, approved oils, solvents, and lubricants, and the data that must be preserved or restored after CIS, reader-controller, DC-controller, main-controller, or HDD repair. Canon also specifies the Digital Multimeter FY9-2002, Cover Switch TKN-0093, Tester Extension Pins FY9-3038 and FY9-3039, and NA-3 Test Chart FY9-9196.

Two manual-specific repair traps deserve attention. Interrupting main power while the HDD is being accessed can cause an E602 fault or data loss, while applying power during initial installation before the fixing-assembly release cover is removed can damage the fixing heater. Board and drive repair requires the specified shutdown and power isolation, and the laser unit is not intended for field adjustment.