Group 26 - Compaq Printer

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Executive Summary

Our group project was the Compaq IJ600 color printer. We were assigned to disassemble, analyze, and reassemble the printer and all its respective components. Using the information we obtained from this entire process, our task was to implement some design enhancements and possible improvements to the printer. We meticulously recorded every piece that was removed and documented the few tools that were used. The product was an inkjet printer that was relatively easy to disassemble, though we ran into some problems.



The product our group was tasked with disassembling was a simple desktop printer. The Compaq IJ 600 is single function inkjet printer. The intended use was for common household medium to low volume printing. The IJ 600 can print in both color and black ink due to separate cartridges. The Compaq IJ 600 has a 100-sheet paper tray for storing paper for print jobs. It can be connected to the computer via a Parallel port or a USB B-type connection.

Work for the project was divided evenly among group members.

Group Leader- Sameer Parikh

Disassembly/Assembly Team- Kevin King, Casey Jacobs

Presentation/Wiki Team- Chris Martensen, Sameer Parikh, Johnnie Pacifico, Casey Jacobs

Presenters- Kevin King, Johnnie Pacifico

CAD Drawing- Kevin King

Group Members

Sameer Parikh

Kevin King

Casey Jacobs

Chris Martensen

Johnnie Pacifico

Before Disassembly

The Compaq Model IJ600 printer was in fairly good condition when we received it. The top casing had a broken knob on one end, but didn’t have a substantial effect on the printer’s appearance or the operation of the casing. It was a little dirty, but that was expected considering how long ago the printer was made. When we opened it up, it looked as if the dissection would be difficult. However upon further examination, the weird shapes of the parts created the illusion that there were more components than there actually were. There ended up being more screws than anything else. All in all, the printer consisted of about 25 to 30 screws and about 20 actual parts. It seems there are only three or four different types of materials used. The metal brace located inside towards the back was aluminum. The paper rollers and some screws seemed to be manufactured out of steel. Other screws, which varied in color, could have been made out of bronze. A belt that was part of the ink cartridge moving system was made out of rubber. The rest of the components, including the casing, trays, ink cartridges, ink cartridge holder, gears, and other little minor components were made out of plastic.

Although the printer did not function when we received it due to the missing power cord, it was easy to see how the printer would work when we removed the top casing. First, the printer’s circuit boards receive information from the computer about the image or text to be printer. The circuit boards then distribute information to the appropriate motors, gears, and the ink cartridges. The first action is the translation from electrical energy to mechanical energy by the first of two paper rollers. When it is time to print, the first roller catches the paper from the top loading section and pushes it through to the second roller. The second roller then grabs the paper and pushes it through underneath the ink cartridges in spurts. Simultaneously, the ink cartridges and the motors moving them process the information about the image to be printed. The motors move the ink cartridges back and forth as they expend little droplets of ink on the page in order to create the desired image. When a line of certain width has the correct ink pattern and density, the motor connected to the roller moves the paper just enough so that the ink cartridges can start printing the next line. This process continues until the entire image is correctly mirrored on the paper. Finally, the roller pushes the finished document out to the tray in the front of the printer.


Disassembly Process Table

Step Process Tool Used Difficulty
1 Slid on plastic cartridge support By Hand Easy
2 Put in paper roller By Hand Easy
3 Put on plastic bridge holding second paper roller By Hand Moderate
4 Screwed in two screws Flat head Screwdriver Easy
5 Put on gears By Hand Easy
6 Screwed in three screws holding gears Phillips-head Screwdriver Easy
7 Put on first gear attached to plastic paper roller By Hand Easy
8 Slid on another plastic roller By Hand Easy
9 Slid on spring By Hand Easy
10 Attached plastic paper roller By Hand Easy
11 Attached the four page rollers which were located on the underside of the metal brace by attaching their springs which were latched onto a hook in the brace By Hand Moderately Easy
12 Put on two tiny metal clips which allowed the metal rod to be put back on By Hand Moderate
13 Screwed on two screws to attach two circular-shaped pieces of metal that the metal roller passed through Phillips-head Screwdriver Easy
14 With the screwing in of two screws the circuit board came off of the plastic holding Phillips-head Screwdriver Easy
15 The ink cartridges popped back in By Hand Moderately Hard
16 Attached plastic holding which contained the second circuit board by popping it back on rubber belt By Hand Moderately Easy
17 Slid a spring on the end of it By Hand Easy
18 Popped on metal roller that held a gear which moves gears on the opposite side of the metal brace By Hand Easy
19 Screwed in three screws which detached a motor soldered to a smaller metal brace along with another motor Phillips-head Screwdriver Moderately Easy
20 Screwed in three screws which attached the circuit board and the two motors Philips-head Screwdriver Easy
21 Screwed in the two screws that hold in the metal brace Phillips-head Screwdriver Moderate(awkward positioning)
22 Place top case on By Hand Easy
23 Screwed in four screws Phillips-head Screwdriver Easy
24 regfaWEFawefaweRemoved 1/4in. Metal Plate from Armature Shaft With Rotar By Hand Easy
25 Removed Small Metal Plate off of Armature Shaft With Rotar By Hand Easy
26 Removed Linear Oscillator from Metal Gear By Hand Easy
27 Removed Washer off of Gear from Metal Gear By Hand Easy
28 Removed Cylindrical Slider from Linear Oscillator By Hand Easy

After Disassembly

Part Table

Part # Part Name Quantity Material and Reason for Choice of Material Function Manufacturing Process Image
1 Cover Screws 4 Steel Holds the cover in place so that the parts inside can work in order Machined
Cover screws.jpg
2 Clips 4 Plastic Lets the paper flow easier from the start to the end. Machined
Clips 1.jpg
3 Ink Cartridge Holder 1 Plastic To hold the cartridge in place. Molded then Machined, and placed by hand
4 Top Roller 1 Plastic and metal for springs Moves the paper from tray towards the ink cartridge Injection Molded
5 Bottom Roller 1 Metal and rubber Rolls with the help of the motor and brings the paper out with ease. Injection Molded
6 Motherboard 1 Computer material Takes information from the printer and prints off onto a paper. Injection Molded, Machined
7 Gear Head 1 Metal and plastic Turns all the rollers via a motor Machined and Hand Processed
8 Motor 2 Metal Runs off power cord to run the rollers and gear head Injection Molded
9 Cartridge Holder 1 Plastic Holds the cartridges in place, internally Hand Processed
10 Cartridge Belt 1 Rubber Helps move the ink cartridge back and forth. Hand Processed
11 Back Case 1 Metal Holds the motherboard rollers and other components in place. Injection Molded

CAD Drawings

CAD Animation


Reassembly Process Table

Step Process Tool Used Difficulty
1 Remove 7 Phillips-head screws Phillips-head Screwdriver Easy, 1 Screw Quite Difficult
2 Removed Rip Fence Bolt to Saw Blade Locking Lever By Hand Easy
3 Removed Removed Dust Blower Angle off of Dust Blower By Hand Easy
4 Removed Dust Blower and Rip Fence off of Casing By Hand Easy
5 Removed Rip Fence off of Casing By Hand Easy
6 Removed Plastic Blade Guard off of Casing By Hand Easy
7 Removed Casing off of Casing Philips-head Screwdriver Moderately Easy
8 Removed Gel Max Comfort Grip off of Casing By Hand Easy
9 Removed Shoe Plate Locking Gear off of Casing By Hand Easy
10 Removed Shoe Plate Locking Knob off of Casing By Hand Easy
11 Removed Trigger Switch off of Casing By Hand Easy
12 Removed Lock on Button off of Trigger Switch By Hand Easy
13 Removed Lock Spring off of Lock on Button Flat-head Screwdriver Easy
14 Removed Plastic Lock Washers off of Lock on Button Flat Head Screwdriver Moderately Difficult
15 Removed Switch Breaker off of Trigger Switch By Hand Easy
16 Removed 2 Cord Clamp Screws off of Cord Clamp off of Casing Phillips-head Screwdriver Easy
17 Removed Red Motor Connecting Wire off of Spring Loaded Graphite By Hand Easy
18 Removed Black Motor Connecting Wire from Spring Loaded Graphite By Hand Easy
19 Disassembled Spring Loaded Graphite Internals By Hand Easy
20 Removed Motor Screw From Casing Philips-head Screwdriver Easy
21 Removed Red Motor Connecting Wire From Armature By Hand Easy
22 Removed Black Motor Connecting Wire from Armature By Hand Easy
23 Removed Metal Gear From 1/4in. Plate By Hand Easy
24 Removed 1/4in. Metal Plate from Armature Shaft With Rotar By Hand Easy
25 Removed Small Metal Plate off of Armature Shaft With Rotar By Hand Easy
26 Removed Linear Oscillator from Metal Gear By Hand Easy
27 Removed Washer off of Gear from Metal Gear By Hand Easy
28 Removed Cylindrical Slider from Linear Oscillator By Hand Easy

After Reassembly

Since we were not given a power cord, we could not test whether the printer worked initially or after reassembly. The product was designed very well for its purpose. However, we still came up with a few improvements that could be made to the printer. For starters, there were many different types of screws. If they were all the same type of screw, assembly and disassembly would be easier and would only require one tool instead of several screw drivers. Second, it seemed like there was a lot of unnecessary space that wasn’t utilized by parts or components. Minimizing space would make for less material needed, and the product would also be smaller in size and not as bulky. A third improvement would be to implement automatic reverse side printing to be able to print double sided pages and save paper. Our last improvement we considered was to change from ink jet printing to laser jet printing. Ink jet is cheaper initially, but laser jet printing is faster, cheaper in the long run, and prints better quality. Overall, the task of creating a simple, cheap, household printer was accomplished by Compaq.