HP 2225D ThinkJet Serial Inkjet Printer For Parts RS-232C DB-25 Hewlett Packard

HP 2225D ThinkJet Serial Inkjet Printer For Parts RS-232C DB-25 Hewlett Packard

The HP 2225D is a desktop inkjet printer from Hewlett-Packard's ThinkJet line, one of the earliest consumer and professional inkjet printers HP produced. This example uses a serial RS-232C interface via a DB-25 connector rather than the parallel port found on some ThinkJet variants. This unit powers on but fails its self-test and does not print — it is being offered AS-IS for parts or repair only.

Specifications & What's Included

• Make: Hewlett-Packard (HP)
• Model: 2225D ThinkJet
• Interface: RS-232C Serial via DB-25 connector
• RS-232C mode DIP switch bank on rear panel (MODE / RS-232C configuration)
• Additional rear connector: DB-25 parallel port also visible on rear panel
• Power: external 9V DC jack on rear panel
• Power switch on rear panel
• Front panel controls: PWR indicator LED, font select button (Aa), Line Feed (LF), Form Feed (FF)
• Desktop form factor, beige/white housing
• Interior print carriage rail and paper path visible and intact
• HP inkjet paper recommendation label affixed inside cover
• Unit appears physically complete — no obvious missing panels
• Sold as-is — no ink cartridge, cables, or manual included

Applications

The HP ThinkJet was introduced in 1984 as one of the world's first mass-market inkjet printers, and it found wide use in offices, laboratories, and with HP calculators and computers of the era. The 2225D specifically, with its serial RS-232C interface, was commonly paired with HP scientific instruments, minicomputers, and terminals that output data over serial connections — making it a popular choice in lab and test environments where serial communication was standard. The ThinkJet used disposable thermal inkjet cartridges, a technology HP pioneered, and it predates the widespread adoption of parallel-port and USB printing. These printers are sought today by collectors of vintage HP equipment, users maintaining legacy lab or instrument setups, and technicians looking for parts to restore working units.