HP OfficeJet Pro K550

Thermal inkjet using 4 individual cartridges for black, cyan, magenta, yellow. Dye colours and pigment black. HP claim the cost per page can be as low as 7.7 US cents for colour print, up to 30% lower than the cheaper kind of colour laser printers which are direct competitors for this kind of printer.

Models:

  • HP Officejet Pro K550 - C8157A - colour inkjet printer with 1 tray. Duplex can be added
  • HP Officejet Pro K550dtn - C8158A - colour inkjet with 250 and 350 sheet trays, duplex and network
  • HP Officejet Pro K550dtwn - C8159A - colour inkjet with 250 and 350 sheet trays, duplex, wired and wireless network.

The paper path suits A4, US letter and smaller sizes. The basic model has a large 250 sheet paper feed tray. A second 350 sheet tray and a duplex option are included on the "DTN" model.

The basic printer has a USB 2.0 port. The DTN version has both USB and wired networking. The DTWN version adds 802.11b/g wireless as well.

Control:

Buttons with graphical icons together with lights for printer and wireless network status. Built in web-server running remote management software shows consumable life and includes a job accounting function.

Duty Cycle:

HP suggest up to 7,500 pages per month (robust for an inkjet). Long life cartridges:

  • 2,350 pages for black
  • 1,200 pages for colour

The throughput rating is high for an inkjet but not comparable with mid-range laser printers which might be given ppm's of 20,000 pages or more. However the implied 250 pages per day is a great deal more than most small offices actually print.

Designed to compete with small office laser printers on speed as well as cost:

  • Black Draft Quality: Up to 37 pages per minute
  • Black Normal Quality: Up to 16 pages per minute
  • "Laser Quality": 12 pages per minute
  • Black Best Quality: Up to 5 pages per minute
  • Colour Draft Quality: Up to 33 pages per minute
  • Colour Normal Quality: Up to 16 pages per minute
  • "Laser Quality": 10 pages per minute
  • Colour Best Quality: Up to 5 pages per minute

HP claim "Laser Quality Speed" - high quality printing at high speed.

Copy Abilities:

Not a copier

Black at 1200x1200dpi. Up to 4800x1200 dpi colour from 1200 dpi input.

HP PhotoREt III enhanced color-layering technology

Paper Handling:

Single 250 A4 sheet tray as standard. A second 350 sheet tray is optional.

Media sizes: 3 x 5 to 8.5 x 14 inches. Letter, legal, statement, executive, envelopes (No. 10, Monarch, DL), cards (3 x 5 in, 4 x 6 in, 5 x 7 in, 5 x 8 in, 4 x 10 in, 4 x 11 in, 4 x 12 in, 8 x 10 in).

Media types: Paper (brochure, inkjet, photo, plain), envelopes, labels, cards (greeting, index), transparencies

Tray 1:Multifunction tray for 50 sheets or 30 envelopes

Tray 2:Up to 250 sheets

Tray 3:Tray built in on the DTN and DTWN models. Up to 350 sheets

Face Up:

Output to a tray holding 150 sheets maxiumum.

Duplex:

Duplex (double sided print) is available as an option. Duplex is built in on the DTN and DTWN versions of the printer.

Processor:

300 MHz

Memory:

32MB Not expandable.

Interface:

Hi-Speed USB port (compatible with USB 2.0 specifications)

Compatabilty with external USB print servers such as the JetDirect en3700 or 175x

Network:

With a network connection HP suggest these printers are suited to workgroups of up to 5 users. There is support for external wireless print servers such as the Jetdirect en1700 or en3700 USB 2.0 Print Servers.

Wired Ethernet built in on the DTN model giving access to printer configuration, consumable use and job costing via an internal web server.

Wireless networking (802.11b/g) is built in on the DTWN model.

Network Protocols:

TCP/IP protocol suite.

PCL3, PCL3 GUI

System Compatability:

Microsoft Windows, Vista, Apple Mac and Power Mac. About 100MB of hard disk space may be used for drivers and controls. Several Linux variants are mentioned as compatible.

Power:

Power input 100 to 240 VAC 50/60Hz.

Power Consumption:

Powersave consumption is 7.20 watts for the K550, 11.36 watts for the K550DTWN

Standby consumption is 8.47 watts for the K550 and 11.36 watts for the K550DTWN

Active consumption is 52.17 watts for the K550 and 58.70 watts for the K550DTWN

Maximum consumption is 180 watts for all models.

Dimensions:

Base model 496 x 403.2 x 212.5mm (19.5 x 15.9 x 8.4 inches)

Weight:

Basic model 9.7 kg (21.4 lb) DTN 12.9kg (28.5lb)

Acoustic Noise:

Sound power:

  • 6.5 B(A) (printing at 16 ppm) Normal mode
  • 6.9 B(A) (printing at 37 ppm) Draft mode

Sound pressure (user standing)

  • 51 dB(A) (printing at 16 ppm) Normal mode
  • 55 dB(A) (printing at 37 ppm) Draft mode
  • 14 dB(A) Powersave mode
  • 15 dB(A) Standby mode

Consumables:

Uses a four ink system with integrated heads.

C9385A HP 88 Black Ink Cartridge, 20.5 ml - C9385A

C9386A HP 88 Cyan Ink Cartridge, 9 ml - C9386A

C9387A HP 88 Magenta Ink Cartridge, 9 ml - C9387A

C9388A HP 88 Yellow Ink Cartridge, 9 ml - C9388A

C9396A HP 88 Large Black Ink Cartridge, 58.9 ml - C9396A

C9391A HP 88 Large Cyan Ink Cartridge, 17.1 ml - C9391A

C9392A HP 88 Large Magenta Ink Cartridge, 17.1 ml - C9392A

C9393A HP 88 Large Yellow Ink Cartridge, 17.1 ml - C9393A

Spares:

Paper Path Components

C8157-67028, Pinch lift assembly - Molded plastic part - Guides the paper during paper advancement (d)

C8157-67021, Pick roller assembly - Used to pick paper from the paper trays (A)

C8157-67024, Full output roller assembly - Rubber rollers to drive the printed paper out of printer.(d)

C8157-67026, Output roller (secondary) assembly - Rubber rollers to drive the printed paper out of printer. (d)

C8157-67031, Drive roller grit assembly advances paper during printing. (d)

C8157-67022, Starwheel assembly - Ensures paper handover from feedrollers to output rollers (d)

C8157-67032, Pad separator - Assembled from plastic and rubber components - Assists in separating sheets of media during printing (Partsurfer says NO LONGER SUPPLIED) (d)

Ink Systems

C8157-67037, Absorber base - Foam to absorb ink spillage from service station (d)

C8157-67036, Ink supply station assembly - Includes motor (output voltage 17v, input voltage 32v) - Holds the ink cartridges and pumps ink through the IDS into the printheads (d)

C8157-67034, IDS replacement assembly - Feeds ink from ink cartridges to printheads (d)

Carriage

C8157-67040, Carriage base assembly - Electronic PCA and optical sensor (operating voltages 32v, 5v, and 3.3v) - Holds print cartridges and moves them across paper to enable printing (does NOT include belt) (d)

C8157-67041, Trailing cable assembly - Flat ribbon cable (voltages 32v, 3.3v, and 5v) - Enables electrical signal transmission between carriage and main PCA (d)

C8157-67045, Carriage motor assembly - Motor that drives the carriage assembly during printing (d)

C8157-67039, Carriage belt - Plastic/rubber toothed belt for transferring mechanical power from motor to carriage

C8157-67062 Bracket motor assembly - Includes motor (rated operating voltage 19v) and two sensors(output voltage 5v, input voltage 5v) - Drives the linefeed rollers to advance the paper during printing

C8157-67050 AC power supply assembly - 100-240V, 50/60Hz to 32VDC, 50/60Hz ac (worldwide operation)

C8157-67063 Sirius sensor assembly - Sensor that helps to determine the end and start of a page

C8157-67044 Carriage felt - Foam with lubricant for the carriage rod

C8157-67020 Duplexer - Allows printing on both sides of paper - Provides access for paper jam clearance - Helps with print output handling

Services:

We are researching service and repair options for these printers.

Options:

C8255A Duplexer - automatic two-sided printing accessory C8255A

C8157-67020 Duplexer - Allows printing on both sides of paper - Provides access for paper jam clearance - Helps with print output handling

C8256A 350-sheet input tray C8256A

C6518A USB cable (a-b) 2 meter C6518A

Copyright G & J Huskinson & MindMachine Associates Ltd 2013, 2015. Some pictures derived from HP User and Service guides. These technical pages do not constitute an offer for sale; just our knowledge at the time of writing. See the catalog. Sales pages on this Web site use cookies to store user information. We also use Google Analytics to track site usage patterns.