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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.
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