Konica Minolta magicolor 1680MF/1690MF Service Manual (2008)

Konica Minolta Business Technologies’ Field Service manual for magicolor 1680MF and magicolor 1690MF, issued as Ver. 1.0 in November 2008. The main-body revision table records error corrections through Ver. 1.02. This is the Field Service volume; the separate Theory of Operation and Parts Guide publications are not included.

PDF Search, Bookmarks, and Wiring Detail

Search and diagram navigation: Text search works across the service chapters and wiring sheets, with embedded bookmarks for the main body, adjustments, troubleshooting, and options. Text within some sample configuration and service reports is not reliably searchable. Small wiring-diagram connector, pin, and wire-code labels require zooming.

One printable 382-page PDF contains 27 opening pages, 308 main-body pages, 20 Lower Feeder Unit pages, 22 Duplex Option pages, four wiring sheets, and one back cover. Covers, contents, revision pages, and seven blank pages are already included in these totals.

Printer, Scanner, and Installed-Option Service

These selected content highlights outline the service coverage rather than reproduce the full contents list. Additional topics include control-panel displays and configuration reports.

• Print-engine repair: Illustrated, step-by-step removal and reinstallation procedures for the fuser, PH unit, transfer roller, media-feed components, motors, fans, and solenoids.

• Boards and power supplies: PRCB, MFPB, fax and USB board replacement, DC power supply removal, high-voltage-unit service, and model-specific replacement notes.

• Scanner and ADF service: Original-glass, IR/scanner assembly, and automatic document feeder removal, with roller cleaning, separation-pad replacement, and image-position adjustments.

• Firmware and service settings: Engine and controller firmware upgrading, calibration, paper-feed and print-pattern tests, maintenance-counter resets, and SRAM/memory clearing.

• Fault diagnosis: Jam and trouble-code charts, power-supply checks, image-quality troubleshooting, fax and scan error tables, and electrical connector references.

• Lower Feeder and Duplex options: Assembly removal, board and drive-component replacement, roller cleaning, sensor layouts, jam diagnosis, and option-specific fault isolation.

Konica Minolta recommends that servicing be performed only by its trained service technicians.

Consumables and Mechanical Repair

The maintenance section explains life control for toner cartridges, the imaging cartridge and its integrated waste-toner system, the fuser, and the transfer roller. Fuser and transfer-roller replacement are linked to maintenance-counter resets; transfer-roller replacement also calls for engine calibration.

The 33-item disassembly/assembly list covers exterior panels, original glass, electronic boards, image-transfer components, scanner assemblies, and paper handling. Service photos and line drawings identify screws, connectors, tabs, springs, and harness routing.

The service-material list identifies cleaning pad material No. 000V-18-1 and isopropyl alcohol material No. 000V-19-0.

Model Differences and Remote Setup

The magicolor 1680MF uses USB connectivity. The magicolor 1690MF adds Ethernet and host USB, with ADF-, fax-, network-, email-, and LDAP-related service content. The specification tables distinguish the regional power-supply versions.

The 1690MF-only Remote Setup Utility section covers telephone-line and local USB connections, dial-setting files, firmware uploads, function settings, memory and SRAM clearing, and utility error messages. It also explains the restrictions on fax communication during RSU use.

The 1690MF option coverage includes the 500-sheet Lower Feeder Unit and the switchback/circulating Duplex Option with its separate attachment. Detailed option procedures cover the pick-up drive, PCCB, ADDB, transport and switchback motors, solenoids, and cooling fan.

Image Adjustment and Diagnostic Tests

Printer Mode documents toner positioning, cartridge ejection, and print-head-window cleaning. Utility and Service Mode coverage includes CIS main/sub zoom and registration, ADF zoom and registration, top and left image-position adjustment, transfer power, image-adjustment parameters, and fusing-temperature settings.

Built-in checks include Tray 1/Tray 2 paper-feed tests, two print test patterns, ADF feed testing, Copy ADF Glass, fax-resolution copy testing, and scanner testing. The Factory Test section distinguishes panel, buzzer, volume, and RAM checks from functions explicitly marked for factory adjustment only and not for field use.

For the 1690MF fax system, the manual documents 64 soft-switch positions with market-specific defaults, G3 ECM, line control, reference codes, and T.30 protocol-monitor analysis.

Symptom Charts and Electrical References

Jam diagnosis covers Tray 1, second transfer, fusing, exit, ADF transport, Lower Feeder, and Duplex paper paths. Fault tables connect symptoms to relevant electrical parts, connectors, control signals, and drawing locations, helping technicians relate a displayed fault to the components and checks involved.

Malfunction coverage includes transport and developing motors, fans, transfer-belt and solenoid faults, polygon/laser problems, fuser and thermistor failures, waste-toner sensing, board and ROM errors, scanner-home and IR-lamp faults, and Duplex cooling-fan code 004A.

Image-quality charts distinguish lines and bands, density variation, gradation and color faults, spots, blur, blank or black output, registration errors, poor fusing/offset, brush effect, back marking, and pitch-related defects. Separate tables address fax communication failures and network-scan errors.

Electrical references include main-body and option parts-layout drawings, the Connector Layout Drawing, the print-cycle Timing Chart, and overall wiring diagrams for the main body, Lower Feeder Unit, Duplex Option, and Duplex Attachment.

Board Replacement and Service Limits

PRCB replacement notes cover transferring parameter chip IC9 and performing BK CLEAR. On the 1690MF, the MFPB and FAXB are treated as a replacement pair; MFPB replacement also clears CIS/ADF adjustment values that require restoration.

High-voltage-unit illustrations identify the locating tab and warn against deforming or loosening its terminal during refitting. Left-cover notes explain how incorrect reinstallation can dislodge the gasket and cause electrical leakage or overheating.

The PH unit is replaced as an assembly and must not be opened or adjusted in the field. Disconnect the main body and installed options from AC power before service. The fuser remains hot after shutdown, and laser and high-voltage areas require the precautions stated in the manual.

Sample Zoom Increments and Print-Defect Spacing

For scanner adjustment, CIS MAIN ZOOM uses 0.2% steps on both models, while ADF SUB ZOOM uses 0.4% steps on the 1690MF. These are adjustment increments, separate from the test-pattern acceptance tolerances.

The print-quality section distinguishes faint lines at 24 mm pitch from uneven density at 25 mm pitch and assigns them different diagnostic checks.