Turbo Chef Technologies Residential Single and Double Wall Oven Display, Speedcook Oven, Fuses

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

The 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. This 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

The EMI filter 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. The top fuse is rated 20 amps and designated for the microwave system only. This safety fuse is designed to trip if the system attempts to operate the magnetrons when the monitor circuit

sees an open door condition. The 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. This 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

The high limit thermostat is a 250 VAC, 3-pole, manual-reset thermostat with a trip point of 572°F (300°C). The 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)

The 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. The 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

The control panel light switch (see page 2.1) activates the lights in the Speedcook oven.

M.O.V. Filter

The M.O.V. filter 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. filter are accompanied by a tripped circuit breaker that will continually trip when reset. Also look for a burned or damaged M.O.V.

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OVEN SYSTEMS