– 15 –
Transformer
Capacitor
PTC Board
Triac
Power Supply Board
Transformer
The transformer supplies 12 VAC to the power
control board (PCB) and the lighting circuit. It is held
in place by two Phillips-head machine screws and
7 mm hex nuts.
Transformer Resistance:
Primary winding (black to white wires) - 7
Ω.
Secondary winding (blue to brown wires) - 0.3
Ω.
Check for 120 VAC between the white and black
wires. Check for 12 VAC between the blue and
brown wires.
Triac
The triac controls the two hood lights. It is located
inside the upper component box. It is held in place
by 2 Phillips-head machine screws and 7 mm hex-
nuts.
If the hood lamps fl icker, the triac wire connections
are incorrect. The triac can be checked for an
electrical short by removing the black lead wire and
measuring the resistance between the two ¼-in.
terminals (black and brown wires). Resistance should
be greater than 1M
Ω
.
PTC Board
The PTC board provides protection for the lighting
circuit during momentary power surges. It is located
inside the upper component box.
Motor Capacitor
The motor capacitor has a value of 25
µ
fd. It is
located inside the upper component box.
Upper
Lower
Power Supply Housing
WARNING:
Components in the power supply
housing are electrically
HOT
when voltage is
connected to the hood.
The power supply housing is located above the fan
housing behind the duct cover. To access the power
supply housing, remove the duct cover, (see
Duct
Cover
) then remove the 2 Phillips-head screws that
hold the power supply cover in place.
Power Supply Housing Cover
Screw
Screw
The transformer is located in the power supply
housing. The triac, fuse holder, motor capacitor, and
power supply board are located in the power supply
housing in separate upper and lower component
boxes.