I found a Kodak printer/scanner in the dumpster.

I don't have the power brick, and it's 36VDC in, so I'm not going to attempt to power this thing and see if it's functional.  Ink would probably cost more than it's worth anyway.

What I want to know is, what kind of good stuff is inside?  What Instructables use parts that I might be able to pull from this baby?

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framistan7 years ago

(response to your comment about voltage/current makes you nervous). 

If you follow basic common sense caution, you will not get hurt.  For example... be sure to UNPLUG the item from the wall outlet before dis-assembling it.  Dont fool with any voltages above 30 or 40 volts... or you might feel a shock.  Dont fool with anything that can put out hundreds of amperes... such as a car-battery.... because you could get burned. (example)...  If a THIN wire is placed across a car battery, it will heat up RED HOT and INSTANTLY and you will be burnt if you are holding the wire.   Most wall-wart power supplies only put out low voltages and low amperages.  Dont short out any power supply.... you will likely burn it out.

Do not connect items labeled to require a certain voltage... to a HIGHER voltage.  For example, if you have a little DC motor that is labeled 12volts... dont connect it to a HIGHER voltage such as 23 volts.  It will turn FASTER and will overheat and burn out.    Basic stuff like that.... Otherwise, dont be afraid to make mistakes because that is how we learn new things. 

yoyology (author)  framistan7 years ago
Thanks!  That's some great advice.  What's bugging me as I read through Instructables and other how-tos is the relationship between current and voltage.  I have a BlackBerry charger with a damaged cord, and was looking for info on how to modify or substitute a different wall wart.  I kept reading what seemed like conflicting information.  The 'Berry charger puts out 5V at 700milliamps.  I have two other wall warts, both 5.9V, but one with 450mA, one with 1amp.  I gather that I don't want to draw more current than the wart is rated, so I don't want to use the 450, but since it's at higher voltage, what does that do? If I use a 7805 regulator IC to make sure I'm getting 5V clean, how does that affect the amperage?

Do you see what I mean by being confused? :-)

And your final point is well-taken.  The BlackBerry charger freaks me out because, if I screw it up, I have a smoked phone.  If I screw up something while playing with the parts of the Kodak, all I'll be out is parts.
Voltage is available at all times... but CURRENT (amperes) do not flow unless a LOAD is connected to the voltage source.  For example,  if a CAR BATTERY was sitting on your table with NOTHING connected... it would have about 12 volts at the terminals.   If you connect a LIGHTBULB to the terminals then AMPERES would flow.  With no load connected No amperes flow.  If you connect TWO lightbulbs, then DOUBLE the amperage will flow.  This relationship can be understood using OHMS LAW.   which simply says that...

     Amperage = Voltage divided by Load resistance.  

A 6 Ohm light bulb will use 2 amperes because    the battery is 12 volts divided by 6 ohms.   When you add a 2nd bulb... the resistance goes DOWN to a total of 3 ohms... so now the amperage is 12 volts divided by 3 ohms.  equals 4 amperes. 

If you EXCEED the amperes of any power source such as the wall-wart... then it will not be able to maintain the output voltage... and may overheat or blow the internal fuse of the wall wart.   

Dont mess around with your blackberry's charger untill your skill level goes up.   The MAIN concern is don't connect the PLUS and the MINUS polarity backwards to the item.  That will fry it for sure.  Thanks for marking my answer as best answer..
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yoyology (author) 7 years ago
 UPDATE: I spent several hours taking it apart the other day.  Unfortunately, it seems that most everything on the circuit boards is surface-mount components, and all the boards are interconnected with ribbon cables that don't terminate in pinouts, but press-fit directly into slots on the boards.

The good news is, I have three motors and a bunch of gears to play around with. :-)
kcls7 years ago
This instructable uses the motor from the inside. Does it have a screen?  Maybe you could use that for something.
yoyology (author)  kcls7 years ago
 There's a little monochrome LCD.

It also has an integrated card reader.  I was thinking about digging that out as well.

I'm probably mostly going to just ruin everything, since I have zero electronics experience.  But hey, that's how I'll learn, right? :-)
kcls yoyology7 years ago
Well, getting the motor out is usually relatively easy. just take the printer apart and cut the wires off leading to the motor. Presto! It's an instructable just waiting to happen.
yoyology (author)  kcls7 years ago
I'm less concerned about the mechanical disassembly than I am about frying stuff when I wire up new circuits.  I'm an English major and librarian.  There's something I fundamentally don't get about the math of voltages and current, and it makes me nervous.
kcls yoyology7 years ago
Ahh.. well as long as you don't stick a wet knife in a wall outlet, you'll probably be okay. I mean, if you fry something, your just losing an old motor. No biggie.