Project Planning: Gate 1

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Firgure 1: Our printer, "Inky," seen here with the HP Auto Two-sided Print Accessory detached.


Work Proposal

Reverse Engineering Approach

The disassembly of the printer will be challenging, and it is hard to say how long each step will take, or even what each step is. There are a great deal of unknowns surrounding this printer that could not be uncovered by our first pass. What we have uncovered though, is that many of the parts are plastic, and are attached to one another through snaps that are only made to snap one way. It will be a challenge not to break anything in removing one part from another, and at this point in time it seems very unlikely that all the parts will survive.

Our plan is simple, remove the outer shell, see what lies beneath, and dig deeper. As a part is removed, we will set it aside, take measurements, take notes, photograph it, and place it in a very orderly fashion along with the others. Organization is essential, as the printer houses many different and often small parts. Due to the inability to know what is inside the printer until we have begun our disassembly, it remains difficult to know how much time we will need. This said, as we are working in Lisa’s garage, our group is not as concerned about time as other groups may be, and we will be more than willing to burn the midnight oil.

Despite the lack of knowledge as to what the printer contains from our initial inspection, we will not be going in entirely blind. Research has turned up a step by step outline of how to dismantle the HP Officejet 7310 printer to a certain extent, as well as informing us of potential hazards.[1]

  1. Remove ink cartridges by pushing down on them and pulling them out of the printer. (1 min)
  2. Remove the screws that hold the outer housing to the printer using either the Torx or Phillips-head screwdriver. (3 min)
  3. Expose the inner chassis of the printer by lifting the outer housing off of the printer. (1 min)
  4. Remove the screws that hold the circuit boards to the chassis, and cut any wires attached to the circuit boards with a pair of wire cutters. (2 min)
  5. Remove the circuit boards from the printer. (2 min)
  6. Find the scanner lamp for the printer and remove the screws holding the lamp to the chassis. Cut any connecting wires. (5 min)
    Warning: The scanner lamp must be handled with caution as it contains mercury, which is toxic.
  7. Remove the scanner lamp from the printer. (2 min)
  8. Remove the screws securing any additional plastic pieces to the chassis. (2 min)

Required Tools

  • #10 Torx screwdriver
  • Phillips-head screwdriver
  • Wire cutters
  • Camera
  • Measuring Tape

Summary of Capabilities

Our group is very well rounded, and each one of us can cover for each other’s weaknesses. However we will have to develop one major skill during this project and that is how to write Wiki code. While some of us have good computer knowledge, none of us has ever used HTML or a Wiki format to create a webpage. This is a skill that will hopefully be developed sooner than later.

\'\'\'Matt Forrest\'\'\'

  • While not an expert in any aspect of technology, Matt’s knowledge and experience make him an all-around worthwhile part of any team. Matt exhibits a dependency and an ability to not only get work done, but to get it done well, seldom leaving others to pick up his slack. A natural leader, Matt is able to motivate and keep others on track, while at the same time listening and proposing ideas of his own. With a high level of confidence, Matt has a talent for speaking in public, but at times demonstrates an over-confidence that can be detrimental.

\'\'\'Martin Moy\'\'\'

  • A perfectionist and extremely attentive to detail, Martin has a knack for finding and correcting mistakes in his own work as well as other’s. Coupled with a strong writing ability, these skills make Martin an excellent editor in all fields of presentation. Martin’s organization and efficiency allow him to flow between the many parts of group work, enabling him to see a project as a whole even in its early stages. In contrast to his perfectionist side however, at times Martin can be plagued with a lazy attitude and minimal desire to work.

\'\'\'Max Wroblewski\'\'\'

  • Max demonstrates a strong ability to follow and understand direction, often exceeding what is asked of him for the good of the group. Vital in clutch situations, Max shows a dependable and reliable nature that makes him an instant go-to-guy when the need arises. His focus and discipline can drive a group to stay on track, and through his ability to analyze problems, Max can act as a problem solving catalyst, bouncing ideas around until a solution is found. Although Max can communicate with ease in one-on-one situations, he is a poor and uncomfortable public speaker.

\'\'\'Lisa Vogt\'\'\'

  • Lisa has a strong knowledge of computers, which translates well into her equally strong knowledge of CAD. Her experience in the use of CAD and other three dimensional drawing programs has given her the knack to see things in greater detail, as well as a foresight to what may lay beyond them. Along with her capabilities in computers, Lisa can often serve as a voice of reason in the group, pushing to explore other options before jumping on the first one that comes to mind. While strong with computers, Lisa’s ability to work with tools in hands on situations is lacking.

\'\'\'Dennis Maines\'\'\'

  • With a high level of experience and knowledge, especially relating to technical fields, Dennis can supplement the skills of the group through his mentorship and expertise. Dennis has a good understanding of how things function, which enable him to solve and think through many technical situations. Combined with this strength of mind is a dexterity that gives Dennis the complete package of abilities needed for the tasks of demolition and reassembly. Unlike his skills with hands on objectives however, Dennis has a somewhat weak writing ability.

Management Proposal

Work Management

Game Plan

Our group’s goal is to work together and complete our tasks in a professional and timely manner. Roles and responsibilities were given to each member in order to strengthen our ability to work efficiently and as a team.

For each gate, work may be distributed amongst members; but for the most part, we will work as a team to analyze our product. In the process of working together, we will learn to communicate as a team and help each other overcome our shortcomings.

Group Meetings

Meetings will be held every week on Monday, Wednesday, and Friday at 1:00 p.m. to 2:00 p.m. Weekly Meeting Location: Map Collection room, in Silverman Library, 3rd floor of Capan Hall

It is expected that all of our members attend each meeting; if any member has an emergency that conflicts with the time scheduled, they will notify our project manager or assistant project manager. For the cases when a few members are not present, namely 2, any 3 members must be present to make a decision for the group. And for the rare case, if 3 members are not present the remaining 2 are allowed to discuss about project matters and inform the rest of the members.

During these meetings, we will present our work to each other and discuss about our progress for the assignment. Our project manager, Matt, will take note of our progress and propose his plans on time management and future assignments.

Any other information will be notified and communicated via UBmail. Within our meeting schedule, the best point of contact is on Mondays and/or via UBmail.

Roles and Responsibilities

Table 1: Here we discuss the Roles and Responsibilities of each group member.

Conflict Resolution

If there is any conflict regarding a member’s performance or insufficient work, the project manager will be the first to be notified, and the situation will be handled either privately or during our scheduled meetings. And if the issue is not resolved and progresses, by vote, the instructors will be notified immediately.

Time Management

Time.JPG Timekey.JPG
Chart 1: In this chart we show a tentative schedule for the group.

Project Archeology: Preparation and Initial Assessment

Development Profile

The HP Officejet 7310 was first available in North America during September 2004,[2] and became available soon after to other parts of the world. In 2004 when the 7310 was developed, the United States was starting to hit a low point in the economy. The Officejet 7310 was developed for smaller consumer businesses, with the intended impact to enable these small businesses or offices to print and copy, as well as giving them the capability of a fax machine. It had a lot to offer for the cost, and could print at 30 pages per minute and also be able to copy at 30 pages per minute.[3] The 7310 was a product that did well with sales, making its timely entrance to the consumer market with great appreciation due to the economic situation.

Usage Profile

The HP Officejet 7310 All-in-One printer can be utilized to execute numerous functions. Its uses include printing, copying, scanning, and faxing, all of which can be in color. These can be performed on both a home and professional level. Although it would suffice for a home desktop as it can accomplish basic tasks, it is most practical for professional use. Its extensive functionality including copying, scanning, and faxing make it ideal for an office or any professional setting. To reinforce its primary usage, one can elaborate on the jobs it can carry out. Its copying capabilities are efficient, as it can print up to 30 copies per minute. It also has the ability to fax at 33.6 kilobits per second, with 110 speed dials and a 150 page memory.[3] Clearly, the HP Officejet 7310 All-in-One is efficient for a professional setting based on its intended use and the jobs it can execute.

Energy Profile

Figure 2: Power supply[4]

Electrical energy is the primary driving force behind the mechanisms within the HP Officejet 7310 All-In-One printer. Electricity is imported into the system through an AC power adapter which plugs into the back of the printer and connects to, in our case, a three pronged outlet typical to American homes, but differnt cords are available for other countries.

The electrical energy from the outlet is then transformed into mechanical energy via several electric motors specific to each function necessary for the successful operation of the printer.

We believe step motors(stepper motors) produce the translational energy needed to move the ink cartridges across the paper, as well as the rotational energy required to feed the paper through the printer. Both functions call for precise movements of their parts, which step motors provide.[5] Although accurate, step motors are quite noisy, resulting in the loud sound produced during the operation of the printer as electrical energy is unavoidably transformed into sound.

A motor is also used to generate the translational movement necessary to move the light (which utilizes electrical energy) across a document within the scanner mechanism.

Electrical energy is also transformed into thermal energy via resistive properties within the cartridge holster. As the ink vaporizes due to the heat, it creates a bubble which expands and pushes some ink out of a nozzle and onto the paper.[6] It is through this transformation from electric to thermal energy that allows the release of ink onto a sheet of paper.

Complexity Profile

The HP Officejet 7310 All-in-One has a variety of components, an anticipated eleven to be exact. Most of these mechanisms require basic knowledge to operate and maintain. The HP Officejet 7310 All-in-One has both complex and simple components. A component can be classified as complex if it is made up of various subcomponents that require further dissection and investigation. A prime example of a complex component in our product is the control interface, as it has elaborate functionality and regulates other systems and functions. An example of a simple component would be something like the scanner lid, whereas it does not have a detailed functionality and cannot be broken down into more subcomponents. As far as the interactions between the components, they can be categorized as primarily complex. There are numerous steps and functions that the product must execute in order to accomplish tasks. For this to happen there must be intricate interactions taking place as each step occurs. An instance of a complex interaction is the relationship between the motor that advances the paper and the rollers. The motor must be able to power the rollers at the exact increment required for a precise print. In summation, it can be stated that the components and their interactions of the product are complex.

The anticipated components of the HP Officejet 7310 All-in-One are outlined below:

Figure 3: "Inky"
  • Paper tray/feeder: Encompasses the paper ready to be loaded.
  • Paper rollers: Picks up and advances the paper to the next stage of the process.
  • Motor: Powers the paper rollers and allows them to feed the paper by the precise increment required to print the image properly.
  • Motor: Moves the print head/ ink cartridges back and forth across the paper.
  • Cartridge holster: Stabilizes the ink cartridge and ensures steady movement.
  • Belt: Allows ink cartridge to move along a consistent and precise path.
  • Scanner lid: Can be opened to insert object to scan, closes to improve the quality of the scan.
  • Scanning head: Moves back and forth, and reads the entire area of the object to be scanned.
  • Motor: Produces the movement of the scanning head.
  • Interface: Facilitates movement of the scanner and operation of printing mechanisms.
  • Front Panel Overlay: Allows for user-interaction with the appliance to edit the settings and conduct functions.

Material Profile

Aside from a couple metal or stainless steel fasteners, the entire outer casing of the HP Officejet 7310 All-In-One printer is made of plastic.

Some internal mechanisms, visible during routine operations, such as the shafts on which the light for the scanner and the cartridge holster slide are also made of stainless steel.

Other unseen internal materials we expect to find include:

  • Copper wiring
  • Plastic wire insulation
  • Metal gears within motors
  • Plastic gears
  • Glass light bulbs
  • Mirrors (within scanner)
  • Metal electrical connectors

User Interaction Profile

The HP Officejet 7310 All-in-One printer is a compact and multi-functional printer. It was meant to be efficient and easy to use for various office tasks.

Just by looking at the interface of the printer, it can be seen that the controls of the printer are at the front and top of the printer, while the power supply is at the back of the printer. The controls consist of the power button, SD card reader, control panel with a display screen and buttons at the front of the printer, a loading tray, and the scanner/copier and fax at the top of the printer. The power supply being the power cord and phone line at the back of the printer.

Those who do not have any prior knowledge of office printers might have difficulty operating the HP Officejet 7310 All-in-One printer. Because it is multi-functional, it will require sufficient knowledge about the printer’s functions and controls. Moreover, maintenance also requires knowledge about the printer’s functions and what materials to use to clean the printer. Luckily, all of this information can be obtained via internet, HP support website, or printer manual.[7] In this manual, it provides the means of how to set up the printer, install the printer software, and maintenance.

Cleaning maintenance is not mandatory, but it is suggested in order to have a long lasting high quality printer. The difficulty for cleaning the interior of the HP Officejet 7310 All-in-One printer is moderately high because it requires time and cautiousness due to the sensitivity of the material of the printer (e.g. glass scanner). On the other hand, cleaning the exterior of the printer is mostly just to remove accumulated debris, which is quite easy by wiping if off with a soft cloth. HP support website.

Supply maintenance is required as a printer uses paper and ink it must be supplied with ink from ink cartridges and paper when the printer runs low on any of these. The difficulty for supplying the HP Officejet 7310 All-in-One printer is easy because the paper tray is outside of the printer, so paper can be supplied directly, and the ink cartridge carrier can be accessed by lifting the upper part of the printer and inserting the ink cartridge into the right slot.

Product Alternative Profile

\'\'\'HP Officejet 7310\'\'\'


  • Cost: ~ $300.00: This price would differ from area, store, or website.
  • Printer, Copier, Fax Machine: each of these will perform the task at hand. When fax is in cycle, there can be no other function working. The Officejet can take print and scan signals at the same time.
  • Prints 30 pages per minute: This is the standard printing output of any of the HP Small office printers
  • 2400x4800 DPI Scan Resolution: The scan resolution is the highest for the small office printers/scanners.
  • Cost of Toner: $70.00/Combo Pack: This price will include two toner packs, one being the black and the other being the multi-color. These will print around 300-350 sheets of paper.

\'\'\'Kodak ESP 6150\'\'\'


  • Cost: ~ $199.99: This price is one-third of the cost than the Officejet. There are many options and reasons the price is cheaper.
  • Printer, Copier, Fax Machine: This machine can only do one task at hand. Whereas the Officejet can receive signals to print and scan at the same time.
  • Prints 25 pages per minute: When printing at a small office or a busy home office, you usually see the printer being ran a lot. This Kodak printer will print 5 pages less a minute than the Officejet, which in real life could waste you or a company a great bit of time.
  • 1200x2400 DPI Scan Resolution: The scan resolution is half of what the Officejet is. This means, you are only going to get half of the clarity when putting the document to a new piece of paper.
  • Cost of Toner: $45.00/Combo Pack: The price of toner/ink is reasonably cheaper, but will only print 200-250 pages per life cycle of the toner.

\'\'\'Brother MFC 990CW\'\'\'


  • Cost: ~ $229.00: The cost is reasonably cheaper. This has a bigger display screen with less confusing buttons. It also comes with a phone to be able to use as a regular telephone when the fax cycle is not in process. This machine is bigger in size. Every dimension it is bigger.
  • Printer, Copier, Fax Machine: Like the Officejet, this can receive signals to run both scanning and printing cycles at the same time.
  • Prints 20 pages per minute: The printing rate is significantly less than even the other two. This being 10 pages less than the Officejet. This would definitely put a slow change in timing for a consumer.
  • 1200x2400 DPI Scan Resolution: The Brother MFC 990CW has half the resolution to scan than the Officejet. This making the scanned pages half the clarity.
  • Cost of Toner: $50.99/Combo Pack: This toner will cost less, but can only print 250-300 pages per life cycle.

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