Display, Speedcook Oven; Electrical Compartment Cooling Fans; Emi Filter; Fuses - TurboChef Residential Single and Double Wall Oven Service Manual

denoted by the triangle is placed onto pin one. For
Gen 1 ovens, the lower display cable is connected to
the control board's P13 connector. For Gen 2 ovens,
the lower display cable is connected to the control
board's J9 connector.

Display, Speedcook Oven

Th e upper liquid crystal display is the primary user
interface for the Speedcook oven. It is connected to
the control board via a ribbon cable. To ensure that
the cable is properly positioned, a red line is located
on only one side of the cable. Th is red line should
face downward on the upper display assembly. It
should also point left on the control board. Failure
to reattach the ribbon cable correctly could lead to a
direct short in the control board and upper display
assembly.
NOTE: In Gen 1 ovens, the upper display ribbon
cable is a ground source for the control board to the
oven frame.

Electrical Compartment Cooling Fans

Both the upper and lower electrical compartment
cooling fans are activated when either the Cook-
Wheel (top oven) or the selector switch (bottom
oven) are turned to any selection other than off .
Both fans are independently monitored by motion
sensors that will display an error message on the
display if either fan fails to function normally. It
accomplishes this by sending 5 VDC pulses to the
control board while the fan is spinning; these pulses
occur so fast that a voltmeter will register an average
reading of 2.5 VDC when the fan is spinning and
a constant 5 VDC or 0 VDC when the fan is not
spinning.

EMI Filter

Th e EMI fi lter helps suppress the amount of RF
interference emitted by the oven and interference
entering from the supply voltage.

Fuses

For Gen 1 ovens, the 15 and 20-amp fuses are
housed in a fuse block. Th e top fuse is rated 20 amps
and designated for the microwave system only. Th is
safety fuse is designed to trip if the system attempts
to operate the magnetrons when the monitor circuit
sees an open door condition. Th e bottom fuse is
rated 15 amps. It is wired in the circuit to protect
the low voltage components in the oven.
Gen 1 ovens also contain a 5-amp fuse located on
the right magnetron cover. Th is fuse is powered
by the K9 relay to provide power to the upper and
lower cooling fans.
For Gen 2 ovens, the fuses are located on the relay
board. Fuse 1 (right side) is rated to 20 amps, and
fuse 2 (left side) is rated to 15 amps (Gen 2 ovens do
not contain a 5 amp fuse).

High Limit Thermostats

Th e high limit thermostat is a 250 VAC, 3-pole,
manual-reset thermostat with a trip point of 572°F
(300°C). Th e thermostat interrupts power to the
main convection heater in the event of an abnormal
condition.
Pertaining to the double wall oven, the upper and
lower ovens have independent high limit thermostats
located in their respective upper and lower electrical
compartments. Reset the high-limit thermostat by
pressing the reset button.

Latch Mechanism (Lower Oven)

Th e latch mechanism automatically locks the lower
oven door during the self-clean cycle to prevent
exposure to the extreme temperatures used to clean
the inside of the oven. Th e oven door can also be
locked by pressing the door lock button underneath
the lower display. It will not unlock unless the oven
temperature is below 500°F (260°C).

Light Switch, Control Panel

Th e control panel light switch (see page 2.1)
activates the lights in the Speedcook oven.
M.O.V. Filter
Th e M.O.V. fi lter limits voltage spikes coming into
the oven system. If a substantial voltage spike enters
the system, the M.O.V. may short as a result of pro-
tecting the system. Symptoms of a shorted M.O.V.
fi lter are accompanied by a tripped circuit breaker
that will continually trip when reset. Also look for a
burned or damaged M.O.V.
5.9