HP DeskJet 1220C Professional Series Service Manual (1999)

HP’s Service and Support Guide covers the DeskJet 1220C Professional Series, including the 1220C (C2693A), 1220Cxi (C2694A), and 1220Cse (C2695A) wide-format printers.

PDF Search and Chapter Bookmarks

Finding service information: Embedded bookmarks link to chapters, subsections, the appendix, and the index. Text search works in parts of the file, but the font encoding makes it unreliable in the main chapters. Small labels in the electrical block diagram are readable when zoomed in.

The guide comes in one printable PDF with 229 pages, including the cover, 16 pages of front matter, the two-page appendix, and the eight-page index. Nine pages within that total contain only a running footer.

Printer Fault Diagnosis and Post-Repair Calibration

This selection of service topics focuses on bench work. The guide also covers routine tasks such as cleaning cartridge contacts and loading thick media through the rear feed.

• Fault isolation: Decision trees cover startup and initialization, LED and error-trap codes, paper feed and eject faults, self-test failures, network response, and unusual mechanical noise.
• Diagnostic printouts: Self-Test and Sample Page routines, Single and Extended Diagnostic tests, Nozzle Pattern and Pen Recovery tests, cartridge alignment, and continuous-print testing.
• Electrical checks: Power Supply and Logic PCA measurements, main logic and power harness checks, and a system-level block diagram for interface, sensor, and motor signals.
• Removal and replacement: Disassembly procedures cover the Service Station Mechanism Assembly, carriage, encoders, motors, paper feed and output assemblies, and supporting frame parts.
• Post-repair calibration: Pen-to-paper spacing procedures cover the PPS Calibration Tool and the LVDT setup after work that disturbs the carriage rod or specified assemblies.
• Parts identification: Exploded views, service-level tables, alphabetical and numerical parts lists, and low-usage kits link parts to the relevant assemblies and service procedures.

The bench procedures are suited to printer service technicians familiar with multimeter testing and ESD protection. HP assigns Service Level 3 work to HP Technical Support.

Workshop Fault Isolation

The DeskJet 1220C Quick Checkup leads into the hardware decision trees. The power-on tree helps separate a Cleanout Trough interlock issue from a fault in the Power Supply PCA, Logic PCA, or wire harnesses. The paper-feed tree compares rear-feed and tray behavior to narrow down the cause of a pickup fault.

USB and IEEE-1284 Centronics connection checks, external JetDirect print server setup, and Windows printer sharing help separate communication problems from printer hardware faults. The Logic Board Signal Flow diagram shows the relationships among the interfaces, memory, ASICs, keypanel, carriage board, and power-supply control lines. Electrical repair coverage is at the assembly and PCA level.

Diagnostic Printouts and Print Quality

The Single Diagnostic page reports the model, serial number, service ID, firmware revision, engine page count, and last stored error. The Extended Diagnostic page shows NVRAM values, including cartridge alignment data. The Nozzle Pattern test identifies gaps in the print pattern, while the three-level Pen Recovery test shows whether the affected nozzles recover. Calibration and Page Alignment tests cover bidirectional alignment, black-to-color registration, and cartridge firing timing.

Dot Count and Pen ID report cartridge usage and identity. Infinite Hs provides a continuous-print test. The guide documents a separate Windows NT diagnostic utility with carriage and Service Station functional tests, firmware identification, NVRAM reset, and printer I/O control.

The product and maintenance chapters explain Thermal InkJet firing, PhotoREt III, ColorSmart III, and the media paths. Cartridge references for the 51645 black and C6578 color families cover nozzle counts, ink capacities, resolution, and cartridge life.

Disassembly, Spacing, and Parts

The Disassembly Sequence shows which assemblies need to come off to reach a part. Chapter 7 covers the encoder strip and disk, carriage and output motors, pick and drive rollers, starwheels, sensors, belts, harnesses, and base plate. Chapter 8 cross-references factory part numbers and service levels to exploded views, including the Service Station, carriage and drive roller, and backbone and spot sensor.

HP calls for pen-to-paper spacing calibration when the carriage rod is moved or removed. This includes flex cable replacement, which requires removing the carriage and rod. The calibration list also covers the backbone, upper paper guide, drive roller, Trough-1, and both supports. The guide identifies C6569A as the PPS Calibration Tool and also covers calibration with an LVDT tool.

The black upper-rail screws are factory-set for spacing tension. Loosening them can upset the adjustment. Moving the carriage with the LVDT probe engaged can damage the tool and the cockle rib.

Before disassembly, shut down and unplug the printer, let the power-supply capacitors discharge fully, and use ESD protection when handling the circuit assemblies.

Sample Power Supply and Spacing Values

The power-on troubleshooting section gives +19 V (B+) as the expected Power Supply Assembly output with its harness disconnected from the Power Supply PCA.

For pen-to-paper spacing, the calibration section specifies 55 ± 10 mils at the check points near both ends of the carriage rod.