Homebrew PCBs

Rob,

The Harbor Freight unit is "concentric" in the sense that the heat is 
provide from all around the roller assembly. It is not concentric with 
either roller. There are two heaters mounted on opposite sides of the 
rollers, and an aluminum structure that is manufactured to fit around 
the rollers. The aluminum structure is actually two pieces that are 
separated to form the slots for the paper path.

The BOM for this unit is mostly irrelevant. By the time the mod is done, 
not much of the original circuitry or wiring remains. The temperature 
control thermoswitch is removed,and replaced by the temperature 
controller I referenced yesterday, the thermal switch that controls the 
ready light is removed because it operates at a temperature that is 
irrelevant. What remains is the small circuit board that holds the ready 
LED and the power indicator LED, and the ON/OFF switch. This board has 
two rectifiers, two resistors and two LEDs. The motor remains, the 
heaters remain and the thermal fuse remains.

There are some photos of the interior of the laminator here: 
https://www.flickr.com/photos/15304611@N03/sets/72157635447779272/ This 
mod is one that adds a dimmer in series with the motor, so most of the 
pics have to do with modifying and mounting the dimmer, but there a few 
that show the motor, the heater and the circuit board. The heater 
control thermoswitch is on the underside of the heater assembly, and not 
in view in these pics.

Harvey

On 12/31/2016 11:10 AM, Rob roomberg@... [Homebrew_PCBs] wrote:
>
> Really? This grabs my attention.
> What make and model?
> Can you take a picture and share?
> Is there an online parts list we can eyeball that shows how concentric 
> heaters are mounted?
>
>
>
> On 12/31/2016 11:53 AM, 'David C. Partridge' 
> david.partridge@... [Homebrew_PCBs] wrote:
>>
>> But, but the heaters are concentric with the rollers (or at least 
>> they are in my laminator) so
>>
>> stopped/forward/reverse should make no difference.
>>
>> Dave
>>
>
>