Forensic Report HP Printer Scanner

Identity of the reporting agency


Case identifier

Unpacking Intelligent Machines

Identity of the submitter

Guillem Camprodon

Victor Barberan

Date of receipt


Date of report


Identity and signature of the examiner

Pablo Zuloaga, Cesar Rodriguez, Anisa Isaeva, Laura Freixas, Isaúl García, Juanita Pardo


HP Printer Scanner (print, fax, scan, copy, web)


MAKER: Hewlett Packard

MODEL: Officejet 6600 Wireless

HP Officejet 6600 Wireless parts.

Forensic Questions

The device prints, scans, copies, and is able to do so through wifi as well as a physical USB connection to a computer - Mac or Windows. The scan function works by capturing light, emitted through an LED module, through a camera sensor as it moves on a fixed axis across the scanning area. The printer works by feeding paper through a tray and applying a layer of ink to it. It is built in multiple component parts, most of the casings are made of plastic and internal components of metal. At this moment, it is unclear as to why it has failed and we do not have information for why it is no longer used.

What does it do? How does it work? How it’s built? Why it failed, or it wasn’t used anymore?

Steps taken

1 - Separating the components by type and material.

2 - Separating the printer and the scanner.

3 - Looking for the connections between all of them to try to understand how they work.

4 - Separating the mainboard from the LCD screen, printing device, cleaning system, scanner lamp, sensors...

5 - Understanding the basics of each part.

6 - Searching for specific parts datasheets.






The H5TQ1G6(8)3DFR-xxx series are a 1,073,741,824-bit CMOS Double Data Rate III (DDR3) Synchronous DRAM, ideally suited for the main memory applications which requires large memory density and high bandwidth. SK Hynix 1Gb DDR3 SDRAMs offer fully synchronous operations referenced both rising and falling edges of the clock. While all addresses and control inputs are latched on the rising edges of the CK (falling edges of the CK), Data, Data strobes and Write data masks inputs are sampled on both rising and falling edges of it. The data paths are internally pipelined and 8-bit prefetched to achieve very high bandwidth.

2 - Microprocessor Marvell


3 - SN96019PFPR


HP 802.11b/g/n WLAN Module


Product Model: SDGOB-0892

Part Number: 1150-7935 (Straight Connector)

Part Number: 1150-7936 (Right Angle Connector)

This module widely used in HP wireless-enabled printers.


STM8S103F2 STM8S103F3 STM8S103K3

STMicroelectronics is a global independent semiconductor company and is a leader in developing and delivering semiconductor solutions across the spectrum of microelectronics applications. An unrivaled combination of silicon and system expertise, manufacturing strength, Intellectual Property (IP) portfolio and strategic partners positions the Company at the forefront of System-on-Chip (SoC) technology and its products play a key role in enabling today's convergence trends.

CN582-80050 REVA


Hewlett Packard  0957-2304

PSU ACDC 32V 1.094A 12V .25A 100-240V IP DESKTOP

Inside the HP Officejet 6600 Wireless we find four types of motors:


From our analysis, we found a variety of very specific and critical connections to make the printer function - any one of which has the potential to make the system unuseable. The overwhelming majority of the connections were traveling through the motherboard and HP chipsets. From here, power is fed and transformed through resistors into the appropriate electricity levels for their intended use. The motherboard connects directly to a visual LCD interface on the exterior of the printer which contains 6 touch sensors which control the printer. From here, or with HP’s software with a  PC interface, the user can direct the printer to perform a function, the processing of which happens within the chipset of the motherboard which directs the message to the printer component to perform the appropriate action.

The printer utilizes both processing and more traditional forms of sensing to produce a print. In particular we noted the optical sensors attached to the paper feeder and the ink ejector mechanisms which allow for the printer to understand its location in relation to the paper. This method of sensing was utilized because the motors associated with these functions are typical dc motors instead of more expensive step motors which are able to identify their own location in space without the use of an optical sensor. We also noted that the ink cartridges within the printer were the original from their packaging, implying that either a component of the printer failed very early rendering it unusable without proper service, or that the printer was relatively unused before failing. In addition to the ink cartridges, we noted a pump system which is intended to clean components of the ink dispersion system. It is unclear what liquid is utilized in this process, or if it ever needs to be changed.

Nearly all components of the printer appear to be proprietary, with the exception of screws for assembly and the wifi receiver chipset which does not appear to be made directly by HP. The primary plastic materials appear to be a High Impact Polystyrene and ABS plastics; while the ABS can be relatively easily recycled, the High Impact Polystyrene is unlikely to be treated in a recycling facility in a similar manner. Metals making up internal components appear to be of extruded aluminum. Interestingly, within the paper feed tray, there is also use of an organic material, cork, we assume the decision of which to include it is in relation to its textural properties in being able to interact with the paper.


What do you learn? What surprised you?

We learn how it works a printer and we understand most of the connections that are between the components.

Bubble Printer