Canon Model A-C4, B195, B198, B264, B265 Service & Repair Manual (P/N C4085-91017)

• Covers the A-C4 copier platform (B195/B198/B264/B265) in a 497-page PDF dated June 20, 2005. The embedded document title also identifies Aficio 3035/3045, DSm735/DSm745, 8035/8045, LD235/LD245, and IS 2235/IS 2245 model families.
• Documents mainframe repair work for the scanner, dual-beam laser unit, photoconductor unit (PCU), development unit, transfer belt, paper-feed system, duplex unit, fusing unit, drive motors, and control boards.
• Provides factory adjustments for laser beam pitch, print and scan registration, blank margins, magnification, parallelogram correction, ARDF image alignment, fuser nip width, and touch-screen calibration.
• Includes SC-code fault isolation, sensor and switch failure tables, fuse-condition charts, board LED sequences, controller test points, SP input/output checks, self-diagnostics, and HDD/SD-card debug-log handling.
• Details installation of the B542 Paper Tray Unit, B544 1-Bin Tray, B538 Bridge Unit, B545 Two-Tray Finisher, B377 Punch Unit, B714 ARDF, B543 LCT, B546 Booklet Finisher, and B408 1000-Sheet Finisher, plus security and accessibility options.
• Supplies illustrated component, paper-path, drive, and board layouts, test-pattern references, preventive-maintenance tables, special-tool part numbers, and system-specific service data.

This is technician-level workshop material. Its safety notice requires installation and maintenance by a customer service representative with model-specific training; the procedures assume experience with copier service modes, electrical testing, ESD precautions, and laser safety.

Installation and Configuration

The installation section begins with site, leveling, clearance, power, and output-connector requirements. Main-machine setup covers the development unit and PCU, developer and toner loading, TD-sensor/developer initialization, tray paper-size settings, and the electrical total counter.

Option compatibility is spelled out before installation. The B538 Bridge Unit and B542 Paper Tray Unit are required for the finishers; the B542 is also required for the B543 LCT. The ARDF and platen cover cannot be installed together, while the B377 Punch Unit requires the B545 Two-Tray Finisher. The B735 Data Overwrite Security section covers package-seal inspection, SD-slot selection, and the PostScript3 coexistence procedure. Separate instructions address the B770 Copy Data Security Unit and the B815 Scanner Accessibility Option, including pre-installation and on-site work.

Mainframe Repair and Adjustment

Replacement chapters cover scanner optics and wiring, the polygon-mirror motor and LD unit, the OPC drum and cleaning system, the development roller and TD sensor, transfer-belt parts, feed clutches and sensors, fuser lamps and rollers, and duplex parts. Further repair procedures address drive motors, NVRAM, IOB, BICU, power supplies, HDD, and the controller board. The paired variants matter: B195/B264 machines are the 35-cpm configuration and B198/B265 machines are the 45-cpm configuration, with explicitly non-interchangeable controller boards.

The PM section gives cleaning, inspection, lubrication, and replacement schedules for the mainframe and supported peripherals. Its tool table identifies A0069104 scanner positioning pins, the A2929500 S5S test chart, and A2309003/A2309004 laser alignment tools. It also specifies a VSSM9000 digital multimeter, B6455010 SD card, and B6456800 USB reader/writer.

The repair notes identify reassembly traps that can cause repeat failures or component damage. The PCU's movable cleaning-blade spring must return to its operating position or the blade will not work correctly; during transfer-belt repair, incorrect routing at the locating pin or allowing the belt to track over a roller edge can damage the belt.

Diagnostics, Diagrams, and Service Data

Service Program coverage is divided into feed, drum, process, scanner, machine-mode, peripheral, and data-log groups. Procedures address test-pattern printing, main-machine and ARDF input/output checks, SMC reports, memory reset, firmware updates, and NVRAM transfer. Detailed self-diagnosis uses a loopback device, while other sections cover DIP-switch setup and HDD/SD-card debug logs. Image-processing charts link SP settings to unwanted backgrounds, vertical lines, moire, weak pencil originals, and lost photo or text detail.

Named visual references include the installation flow chart, main-machine component layout, paper path, drive layout, board-structure block diagram, and SC740/SC741 booklet-finisher LED flash chart. Electrical coverage is diagnostic rather than a full wire-by-wire schematic set, centering on board architecture, sensor checks, fuse symptoms, LED states, and controller test points.

Scope and Safety

Specification tables cover both speed configurations, paper sizes and weights, machine and option capacities, regional power, dimensions, image resolution, energy modes, and the accessory matrix. Internal disassembly and overhaul of the finishers, ARDF, LCT, and tray units are outside this mainframe manual; peripheral coverage is limited to installation, configuration, PM, selected service checks, fault codes, and specifications.

Disconnect the power cord before internal repair. Some circuits can remain energized with the main switch off, the fusing assembly stays hot after operation, and the laser optical chassis is not field-repairable.