HP DeskJet 1220C Professional Series Service Manual 1999

• Exact model coverage: HP DeskJet 1220C (C2693A), DeskJet 1220Cxi (C2694A), and DeskJet 1220Cse (C2695A) in a 229-page OEM HP Service and Support Guide PDF.
• Fault-isolation content: decision trees for power-on, printer initialization, LED and error-trap patterns, paper feed and eject faults, self-test failures, network response, and unusual mechanical noise.
• Built-in diagnostic coverage: Self-Test and Sample Page routines, Single and Extended diagnostics, Nozzle Pattern and Pen Recovery tests, cartridge calibration and page alignment, Dot Count, Pen ID, Infinite Hs, and the DeskJet 1220C software diagnostic program.
• Electrical and control-system repair: Logic PCA and Power Supply diagnosis, main logic and power harness checks, sensor and motor signal paths, USB and IEEE-1284 interface coverage, and the system-level electrical block diagram with Logic Board Signal Flow.
• Mechanical removal and replacement: Service Station Mechanism Assembly, carriage and carriage rod, encoder strip and disk, carriage and output motors, pick and drive rollers, starwheels, output mechanism, upper paper guide, Trough-1, supports, backbone, and base plate.
• Calibration, parts, and diagrams: post-repair pen-to-paper spacing procedures, PPS Calibration Tool P/N C6569A, LVDT calibration coverage, exploded assembly views, service-level parts tables, alphabetical and numerical parts lists, and low-usage kits.

This HP publication is built for bench diagnosis and repair of the DeskJet 1220C wide-format platform, with service chapters beyond setup and operation. The product section explains the Thermal InkJet firing system, PhotoREt III and ColorSmart III image processing, media paths, and cartridge specifications. The interface and signal-flow sections show what an OEM service publication covers at shop level: USB and IEEE-1284 Centronics connections, external JetDirect print servers, and Windows printer sharing. That detail helps separate communication problems from printer hardware faults.

Workshop Fault Isolation

The troubleshooting chapter is built around service decisions rather than a generic symptom list. The HP DeskJet 1220C Quick Checkup leads into twelve decision trees—eleven fault-finding trees plus the chapter 7 Disassembly Sequence. Power-on diagnosis checks the Cleanout Trough interlock, Power Supply PCA, Logic PCA, and wire harnesses. Separate trees isolate initialization failures, LED and error-trap codes, paper-feed and paper-eject faults, self-test problems, network-printer response, and noise from the carriage, rollers, Left Support, or Service Station.

Required shop equipment is identified, including a digital multimeter, TORX drivers, ESD protection, cleaning materials, and hand tools. The electrical documentation follows the USB and parallel interfaces through the logic board, memory, ASICs, sensors, motor drivers, keypanel, carriage board, and power-supply control lines. Its scope is assembly- and PCA-level diagnosis and repair rather than component-level circuit-board rebuilding.

Diagnostic and Print-Quality Testing

The test section provides much more than a nozzle check. Single and Extended Diagnostic pages report model and serial data, service ID, firmware revision, engine page count, stored error information, NVRAM values, and cartridge-alignment data. Nozzle Pattern and three-level Pen Recovery tests help distinguish blocked or non-firing nozzles from electrical or service-station faults. Calibration and Page Alignment tests check bidirectional cartridge alignment, black-to-color registration, vertical alignment, and cartridge firing behavior.

Dot Count and Pen ID pages document cartridge identity and usage counters. Infinite Hs supports continuous-print stress testing, while the software diagnostic program adds carriage and Service Station functional tests, firmware identification, NVRAM reset functions, and printer-I/O control. Cartridge reference data covers the 51645 black and C6578 color families, including cartridge nozzle counts, ink capacities, resolution, and cartridge-life information.

Removal, Calibration, and Parts Identification

Chapter 7 separates parts that can be replaced without calibration from assemblies that require pen-to-paper spacing after repair. Among them are the carriage/rod, flex cable, backbone, upper paper guide, drive roller, Trough-1, and left and right supports. Removal and replacement coverage extends from the Logic PCA and Power Supply to the Service Station, paper-handling mechanisms, motors, sensors, belts, harnesses, and structural assemblies.

Named visuals include the System Level Block Diagram (Electrical), Logic Board Signal Flow, Troubleshooting Power On Problems tree, Disassembly Sequence, and exploded subassembly views for the Service Station, carriage/drive roller, Trough-1/Left Support, and backbone/spot sensor. Chapter 8 cross-references these views to service levels and factory part numbers.

The calibration cautions matter during repair. The black Upper Rail screws are factory-set for PPS tension and are not the adjustment screws; loosening them can upset the spacing setup. The guide also warns that moving the carriage with the LVDT tool installed can damage both the tool and the cockle rib.

Before internal repair, power the printer down, disconnect it from AC power, allow the power-supply capacitors to discharge, and use ESD protection when handling the PCAs.