How do these things work?

Lino

Lino

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Hey guys, now I have been using google for these but I can not get a decent or correct answer. (unless I really suck using Google:D)

1) Why do some PC's not boot when their case os open, I know it can be a BIOS setting but seriously how do they know the case is open?

2) In a laser printer, why doesn't the paper stick to the drum while it is being fed through?

3) Does setting carbon copy's in printers differ from brand to brand?

If anyone wouldn't mind helping me I would apprciate it:o
 
With 1...probably a light sensitive diode. They're tiny things so not something you would notice easily. I believe the acronym's LDR. Bit rusty on the acronyms ;)
 
Hey thank you so much, so if i understand this correctly is the diode doesn't see the case then it will not allow the PC to boot?
 
Number 1: most server cases have a switch which connects from the case door to the motherboard. Its really irritating though I have one that is malfunctioning and always tells me the case is open even though it is close :(
 
#1 Only ever seen the case sensors on Dell or Gateway PC. As ATI mentioned, there is a little switch that can be installed usually called a "chassis intrusion switch". Dell and Gateway is it to void your warranty if you open the case yourself.

#2, Why would it stick?

#3, Never actually thought about that. Dont they just "double print" or have I misunderstood the whole question
 
2) Well if the printer is +600 volts and the Paper -600 volts then in theory shoulds the paper stick?

3) Carbon setting is a feature on some printers that allows it to make copies, and sometimes stack etc
 
3) I might be wrong, but isn't the carbon copy feature implemented on some of the newer laser printers, where you can set 2 or more different watermarks or templates on the printer. Then, when you print, it automatically lables one as a customer copy and another as a warehouse/company/whatever copy
 
#2 ok now I get it :) Initially they do "stick" as the paper moves with along at the same speed as the drum. The paper also has a stonger charge than that of the drum in order to pull the toner off. As soon as it picks up the toner from the drum, the charge on the paper is removed by the "detac corona wire" so that it doesn't "wrap" around the drum and moves on to the fuser.

#3 Not sure on printer to printer, But in theory it should be transfered through to the printers memory which allows it to printer multiple copies from memory. (Like on format design printers were you can hit "reprint" after a copy is made) This would sometimes "overflow" though, which is why when you try print really large images you sometimes get errors with older printers. I am also assuming here the the spooler service in the OS along with the printer driver, might transfer data back and forth as needed.
 
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Hey thank you,,,

So you say the charge on the paper is removed by the 'detac corona wire' before or after its been printed on?
 
Linoman said:
Hey guys, now I have been using google for these but I can not get a decent or correct answer. (unless I really suck using Google:D)

1) Why do some PC's not boot when their case os open, I know it can be a BIOS setting but seriously how do they know the case is open?

2) In a laser printer, why doesn't the paper stick to the drum while it is being fed through?

3) Does setting carbon copy's in printers differ from brand to brand?

If anyone wouldn't mind helping me I would apprciate it:o
Click to expand...


1) There is a chassis cable that closes a circuit with the M/B. If disconnected then circuit is broken... (this cable is linked to chassis).

2) Most probably due to the cartridge used. Laser printers use a "dust" that is activated by the laser and produces the words/pics...

3) Dunno.
 
Hey guys, another question (and know I have been doing my research but this really confuses me)

When people talk about laced and interlaced monitors is this the same thing as Active and Passive Matrix?
 
@ Linoman

At my work, we have a bunch of miserable Compaq Pentium 3 Deskpro's. They are flatbed computers, and when you open their case, they have this little slide switch thingy that changes after the top comes off. Next time you start the computer, it knows the cover was removed.

I've never seen this on any other computer I've worked on.
 
Asha'man X said:
@ Linoman

At my work, we have a bunch of miserable Compaq Pentium 3 Deskpro's. They are flatbed computers, and when you open their case, they have this little slide switch thingy that changes after the top comes off. Next time you start the computer, it knows the cover was removed.

I've never seen this on any other computer I've worked on.
Click to expand...

That's seriously weird, is there a way to disable that function?
 
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