Homebrew_PCBs

On Sat, 04 Jun 2005 15:04:19 +0200, Philip Pemberton
<philpem@...> wrote:

> Lucky you. I tried to track down a fuser - got a quote of £97 + VAT
> (total of
> about £120, or roughly $200) for a Laserjet III fuser. Second-hand from a
> scrapped printer, too...
> (either I'm looking in the wrong place or fusers are seriously expensive)

Now that's outrageous, you can get HP IIIs for 1eur sometimes at ebay,
complete!
I would not expect more than 10eur for a fuser unit.

> The biggest problem I found was finding data on the thermistors. You
> need to
> keep track of the temperature of the fuser and switch the power based on
> that, otherwise you end up frying the thermal fuse or blowing the heater.

You don't need to know which thermistor it is. what i did was use a
thermocouple to measure the fuser temp. manually to set it. from there on
your circuit is set to bias around that thermistor value, nothing more is
required.

> The other problem is the motor drive, but that's not too difficult -
> steal
> the motor and drive gears from the printer and use them

Yes, if you are mechanically challenged go to the DIY and grab that
chicken grill motor.

> I've got the LaserJet service manual here - if someone wants to sell me a
> cheap LJ/LJ2/LJ3 fuser (or point me to somewhere in the UK that sells
> them
> cheaply), I'd be happy to design something to drive it. Obviously I
> can't do
> that without a fuser :-/

<http://search.ebay.co.uk/fuser-assy-assembly-unit-coating_W0QQbsZSearchQQcatrefZC6QQcoactionZcompareQQcoactionZcompareQQcoactionZcompareQQcoactionZcompareQQcoentrypageZsearchQQcoentrypageZsearchQQcoentrypageZsearchQQcoentrypageZsearchQQcopagenumZ1QQcopagenumZ1QQcopagenumZ1QQcopagenumZ1QQfltZ9QQfposZPostcodeQQfromZR10QQfsooZ1QQfsopZ1QQftrtZ1QQftrvZ1QQga10244Z10425QQpriceZ1QQsacatZQ2d1QQsacatZQ2d1QQsacatZQ2d1QQsacatZQ2d1QQsadisZ200QQsaprchiZ20QQsargnZQ2d1QQsaslcZ3QQsatitleZfuserQ20Q28assyQ2cQ20assemblyQ2cQ20unitQ29Q20Q2dcoatingQQsbrftogZ1QQsofocusZbs>

that and patience..


ST