Canon NP6050 Copier Service Manual (1996)

This May 1996 Canon factory service manual (REV.1) covers the NP6050 electrostatic console copier with a fixed copyboard. It documents regional power and paper-size detection differences, along with cassette, paper-deck, and multifeeder operation.

PDF Bookmarks and Schematic Detail

Navigation and readability — Embedded bookmarks open service sections and appendix diagrams. PDF text search is unavailable. Small schematic labels generally need magnification, and some signal labels in the General Circuit Diagram remain hard to read even when zoomed in.

The download is one printable PDF with 388 pages, including the 59-page appendix.

Copier Repair, Paper Timing, and Circuit Diagnosis

The selected topics below are part of the manual’s coverage. Other sections explain automatic charging-wire cleaning and the backup power circuit for the date and time display.

• Scanner and drive service — Scanner drive cable and lock, lens stage and motors, main and vertical-path drives, and control and touch panel removal.
• Paper feed and duplexing — Multifeeder, cassette and deck pickup, registration, holding-tray feed for duplex and overlay copies, fixing, and delivery assembly service.
• Drum and image formation — A-Si drum, potential sensor, charging assemblies, wires and grids, developing and hopper units, separation claws, and waste-toner feed.
• DC controller diagnosis — Input and output references, copy-cycle timing, jam detection, and error circuits for the scanning lamp, fixing heaters, and motor rotation.
• Installation and setup — Site selection, unpacking, scanner and fixing assembly installation, AP kit and charging assembly setup, initial toner supply, relocation, and Control Card V installation.
• Scheduled maintenance — Servicing charts and tables of periodically replaced parts, consumables, and durables, with Canon part numbers and estimated service lives.

The manual is suited to copier service technicians who can follow board-level signal diagrams and use service mode for checks and adjustments.

Image Formation and Electrical Diagnosis

The copying-process chapter follows the image from pre-exposure and primary charging through optical exposure, single-component toner projection, pre-transfer charging, transfer and separation, heat fixing, and drum cleaning. It explains how drum surface-potential feedback, scanning-lamp intensity, automatic exposure, developing bias, humidity compensation, and corona-current control affect image density and paper separation.

The DC controller input and output sheets link sensor and switch signals to motors, clutches, solenoids, fans, heaters, high-voltage outputs, and the control panel. For a recurring jam, a technician can compare the expected sensor transitions with where the sheet stops to narrow the fault to a section of the paper path. The sequence charts cover warm-up, normal copying, page separation, RDF stream reading, duplex and overlay operation, and reverse delivery.

General Timing Charts I and II accompany the 29-sheet DC Controller PCB schematic series. The appendix also contains separate DC Power Supply PCB drawings by voltage version and schematics for the High-Voltage Transformer, Holding Tray Control, and Potential Measurement PCBs. The drum-heater section and parts tables flag specific differences for the 100 V model.

Mechanical Adjustments and Service Scope

Illustrated procedures cover process-unit removal, scanner cable routing and lock position, paper-deck size changes and registration, holding-tray belt timing, charging-wire and grid fitting, and cleaning-blade and seal installation. The maintenance charts organize cleaning, inspection, lubrication, adjustment, and replacement by assembly and copy count.

Reverse drum rotation during process-unit removal can leave the cleaning blade improperly seated. Forcing the holding tray’s upper feed guide can break its stopper. The high-voltage transformer and its factory-adjusted PCB are replaced as a set. Disconnect power before electrical service.

The manual covers the copier body and its interfaces with the RDF-D1/D2 and Stapler Sorter-E1/E2. General Timing Chart II shows the copier, RDF, and Stapler Sorter-E1 working together. Internal feeder and sorter repairs are covered in their separate service manuals.

Sample Fixing and Holding-Tray Adjustments

The fixing-roller nip check specifies a center width of 7.3 ± 0.5 mm on A3 paper. The service-mode measurement calls for heated rollers, a 15-minute wait after warm-up, and a 20-copy run before measurement.

For holding-tray separation-roller pressure, the adjustment illustration specifies a 32.7 ± 0.1 mm gap from the adjusting roller to the shaft.