Hi Ken
Thanks for your compliments :-)
It's eventually the single heat laminator
I don't have te schematics... All what I did was to find the CTN (which is hidden under the bottom roller (easy to find --> follow the long yellow wires).
Then I simply put a pot in serie with this ctn in order to increase its resistance... And it's enough to cheat the comparator which finds that the temp has not reached the required value...
190°C is the absolute max temp. The green light is on at 170°C, but the temp goes on climbing up to 190° and then decreases slowly.
The walls started to melt before 170°... roughly at 150°
My laminator had only a 120° temperature. And this wasn't at all enough to melt the toner.
I have read on this forum that the ideal temp is 170°C. That's the reason why I went to these temps... and it seems to work fine :-)
I don't know the brand of my printer (office one) I will check
Bye
JP
--- In Homebrew_PCBs@yahoogroups.com, "sailingto" <sailingtoo@...> wrote:
>
> Hello JP, glad to see your post, and a VERY nice job on the toner transfer - clear, clean - should etch very good.
>
> I do have a couple of questions and comments:
>
> Is that the single heat GBC laminator? If so, do you have a schematic you've drawn up to show where you mounted the resistor to increase the temperature? If this is the dual heat version I think there is a schematic in the files section that is pretty good in PDF format. I have schematic in PDF file if you need it.
>
> 190C?? WOW!! That is HOT!! What printer are you using? When using a Brother laser printer I had to get around 210C for good toner transfer. Since changing to a HP P1006 laser printer I only need 140C or so for good TT( Toner Transfer).
>
> I also melted the supports on my first GBC laminator - I jumper-ed out the thermal switch and forgot to watch the temperature - when I came back in room the temperature was over 300ºC!!! and the plastic supports where melted allowing the rollers to fall down.
>
> How high did the temperature get before the walls melted?
>
> Still having fun!!!
>
> Ken H>
>