Electrical System; Heater Control Circuit - GBC Ultima 65 Service Manual

5.2 Theory of Successful Lamination (continued)
3. Total encapsulation of product, with a complete film-to-film border, is often recommended to
prevent an otherwise successful laminate from splitting within itself.
Total encapsulation of product, of course, prevents splitting from casual abuse of a corner or
edge of the laminate, and obviously, moisture vapor or liquid cannot enter to weaken the
laminated product.
Flush cutting of laminated product, or even slightly into the product, yields a neat, trim
appearance but renders the product sensitive to splitting at the edges and particularly at
corners. The split occurs within the product and not at the adhesive product interface. Flush
cutting also leaves a paper edge exposed to the atmosphere and any moisture vapor it contains.
However, this may be of little consequence unless the laminate is exposed to an actual liquid,
where upon the fibers within the product loosen from one another and splitting occurs.
5.3

Electrical system

5.3.1 Heater Control Circuit

The heater circuit is responsible for the temperature and power regulation of the infrared
heater assemblies, working in conjunction with the Main PCB, Control Panel PCB, triac,
thermocouple (temperature sensor assembly) and the thermal cutoff (TCO). The Heater
Control Circuit is comprised of the following electrical components:
1. Infrared heater assemblies (IR1 & IR2): Resistor type heaters that generate heat
when activated. Resistance for the Ultima 65 = 16 ohms (All values +/- 1 ohm).
2. Main PCB (PCB1): Main control board responsible for the control of all electrical
components in the machine. SV1 on the PCB, sets the ambient temperature of the
machine. SV2 on the PCB, sets the high temperature setting and the ready light on the
Control Panel PCB. These 2 potentiometers work in conjunction with the other, when
you adjust one the other will also be affected.
3. Control Panel PCB (PCB2): Features all the controls and LED indicators for interface
with the operator and the laminator.
4. Triac (TR1): Voltage applied to the triac is routed through the Main PCB (PCB1) to
the Infrared Heaters (IR1 & IR2). This triac can be tested by removing the red and
yellow leads from the Main PCB and taking a resistance reading of open. If you get an
indication of a short, then the triac has failed closed.
5. Thermocouple (TSA1): The temperature sensor provides a heat reference for the Main
PCB (PCB1). This sensor should read a short when cold. Ultima 65 has 1 wrap capton
tape. These sensors should be soldered and have no air pockets.
5.0 TROUBLESHOOTING
5-2