Homebrew PCBs

It´s just a halogenlamp... With a temperature controller... 
  ----- Original Message ----- 
  From: gettingalongwouldbenice 
  To: Homebrew_PCBs@yahoogroups.com 
  Sent: Thursday, November 11, 2004 11:53 AM
  Subject: [Homebrew_PCBs] Re: HP Laserjet Fuser



  --- In Homebrew_PCBs@yahoogroups.com, "mikezcnc" <eemikez@c...> wrote:
  > 
  > I  have a laserjet fuser and an curious if voltages used for the 
  > heating element are fairly similar. I traced from the circuit and it 
  > appears that it is a 120V AC. Is this what you have in your fusers? 
  > 
  > And if so then for the test purposes have you tried to apply that 
  > voltage to the fuser?  Mike

  It's gonna depend on your particular model.  I'm a newbie at this, but
  I'm quite certain that if you put 120VAC to the fuser element, you'll
  burn it up before you can get it turned off.

  My Laserjet 4L heats in 10 seconds.  It has a thermistor that
  controls the power to set the temperature at 200C.  That's 10C
  a second.  I'm sure
  it'd meltdown in half a minute at full power.  Well, I guess the thermal
  fuse would open before it actually melted the metal.

  I wouldn't even think about running a fuser without some kind
  of temperature feedback.
  mike





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