2005 Kyocera KM-1650/2050 Copier Service Manual (P/N 2DA70763)

Kyocera’s service manual for the KM-1650 and KM-2050 multifunction copiers covers installation, troubleshooting, repair, and calibration. This is the June 2005 edition, document 2DA70763, Revision 3, with the shared 2DA/2DB identification used throughout its technical sections.

• Machine configurations: Single-drawer and dual-drawer arrangements, with model-specific feeder components, repair procedures, and optional equipment identified throughout the manual.

• Installation: Machine setup and installation of paper feeders, document processor, duplex unit, drawer heaters, key counter, finisher, job separator, fax system, network scanner, and hard disk.

• Maintenance mode: Motor, switch, clutch, exposure-lamp, high-voltage, developer, and fixing-system checks, plus printer, scanner, and document-processor adjustments.

• Component repair: Removal and replacement of paper-feed hardware, scanner wires, optical units, drum and charger assemblies, developing unit, transfer roller, and fixing components.

• Troubleshooting: Jam-detection conditions, service codes, image-defect examples, and electrical and mechanical fault tables linking symptoms to checks and corrective measures.

• Electronics and references: Firmware updates, PCB replacement requirements, connector pinouts, wiring diagrams, timing charts, maintenance-part numbers, and periodic service tables.

Written for service personnel, this manual assumes the technical skills needed for electrical diagnosis, optical alignment, and internal copier repair.

Installation and Optional Equipment

Setup instructions cover packing removal, toner installation, initial copy settings, and test copies. The single-drawer configuration accepts up to three additional paper feeders; the dual-drawer machine accepts up to two. Their approximate chassis weights are 42 kg and 49 kg, respectively.

Option installation includes mounting details, cable routing, connector locations, and setup checks. Coverage of the document processor, finisher, fax, network scanner, and add-on feeders centers on installation, host-machine settings, and related fault diagnosis rather than complete internal overhaul.

The fax-installation section specifically refers initialization under U601/U602 to the separate fax-system service manual.

Paper Feed and Scanner Alignment

Roller and clutch replacement is supported by registration, margin, paper-slack, and motor-speed adjustments. Scanner service covers exposure-lamp replacement, scanner-wire routing, ISU replacement, and laser-scanner-unit removal, followed by the applicable squareness, magnification, and image-position checks.

Calibration equipment: Automatic scanner and document-processor adjustment uses specified original P/N 2A068021. Scanner-wire installation distinguishes gray front and black rear wires and requires frame-securing tools P/N 302C968310 and scanner-wire stoppers P/N 3596811.

Drum, Developing, and Fixing Repairs

The repair sections explain drum-unit, main-charger, developing-unit, and transfer-roller replacement. Fixing service extends to the press roller, heat roller, heaters, separation claws, thermostat, and thermistor, including fixing-unit height adjustment for lateral squareness.

Strong light and contact with the OPC drum surface can cause image defects. Substituting wire for the specified fixing thermostat can seriously damage the machine.

Follow the manual’s electrical-isolation precautions around mains circuits, high-voltage charging components, moving mechanisms, and hot fixing parts. Internal disassembly of the laser optical unit is prohibited.

Fault Diagnosis and PCB Replacement

Jam tables identify the switches and timing conditions involved in each fault. Separate MIP-PG and VTC-PG test patterns allow print-engine performance to be checked independently of the scanner, helping technicians distinguish printing faults from scanning defects before choosing an adjustment.

U-code entries provide the relevant purpose, operating method, adjustment range, and initial setting. Main and printer-board firmware procedures use Compact Flash; PCB replacement instructions address firmware versions and EEPROM transfer.

High-voltage PCB resistors VR201, VR202, and VR301, together with drum-unit zener PCB VR1, are factory-set and cannot be adjusted in the field.

System Diagrams and Service Charts

Mechanical explanations follow CCD scanning and laser imaging through drum charging, single-component development, transfer, fixing, switchback, and duplex operation.

Illustrations include the Paper Feed Section Block Diagram, optical-section circuitry, Developing Section Block Diagram, Fixing Temperature System, Engine PCB Block Diagram, and General Wiring Diagram. PCB silk-screen layouts and connector tables support component identification, including destination-specific power-source boards.

Four appendix paper-feed timing charts document signal relationships. The Chart of Image Adjustment Procedures identifies the adjustment order and separates contact-glass settings from document-processor settings.

Examples of Image Calibration Data

For U053 motor-speed checks using an A3/11" × 17" VTC output, the specified test-pattern dimensions are A = 300 ± 1.5 mm and B = 270 ± 1.35 mm.

U065 main-direction scanner magnification has a setting range of −25 to +25, with each setting increment changing magnification by 0.1%.

PDF Search, Bookmarks, and Diagram Detail

Search and drawing access: Service text is searchable, although some PCB artwork labels and the final contact page are not. Embedded bookmarks provide chapter and subsection navigation; the Cover bookmark has no working destination. Small wiring and PCB labels require zooming for comfortable reading.

Supplied as one printable 280-page PDF in English, including 14 preliminary pages covering the title, revision history, safety information, contents, and two intentionally blank pages, plus one final manufacturer contact page.