Control System; Control Board; Display; Electrical Compartment Cooling Fans - TurboChef i3 Service Manual

Control System

This section contains information about the
following components:

- Control board

- Display

- Electrical compartment cooling fans

- Electrical compartment cooling fan thermostat

- Electrical compartment thermocouple

- EMI filter

- Fuses

- High-limit thermostat
- Keypad
- Magnetron cooling fan
- Magnetron thermostats
- Power supply
- Relay (K1 - Filament)
- Relay (K2 - Anode)
- Relay (K3 - Monitor)
- Relay (K6 - Voltage)
- Relay (K7 - Mag fan)
- Relay (K8 - Stirrer)
- RTD
- Smart card reader
- Solid state relay (K4/K5 - Heater)
- Speaker
- USB port
- Wire harness
- Voltage sensor
Control Board
The control board controls each electrical component
of the oven. See page 49 for a schematic. 24 VDC can
be measured at pin 2 of the J7 connector.
Display
The TFT high-resolution display is the primary user
interface.
Electrical Compartment Cooling Fans
The cooling fans (located at the rear of the oven) are
actuated by the cooling fan thermostat when the tem-
perature of the electrical compartment reaches 120 º F
(49 º C).
Electrical Compartment Cooling Fan
Thermostat
The cooling fan thermostat actuates the rear cooling
fans when the electrical compartment temperature
reaches 120 º F (49 º C).
Electrical Compartment Thermocouple
The electrical compartment thermocouple measures
the temperature of the electrical compartment. If the
temperature of the electrical compartment is above
158 º F (70 º C), an F6: EC TEMP fault will display.
The control board checks the temperature of the elec-
trical compartment once every 60 seconds.
The electrical compartment thermocouple cannot be
replaced on its own if it fails; rather, the control board
must be replaced.
EMI Filter
The EMI filter helps suppress the amount of RF
interference emitted by the oven.
Fuses
The F1 and F2 fuses are 12-amp, ATMR. The F3 fuse
is 20-amp ATMR.
The F1 fuse (via blue wire) or F2 fuse (via brown
wire) is designed to blow in case of an over-current
situation relative to the following components:
- BMSC motor controller
- Electrical compartment cooling fans
- Filament transformers
- Magnetron cooling fan
- Power supply
- Stirrer motor
The F3 fuse is designed to blow in case of an over-
current situation relative to the microwave system
(magnetrons, HV transformers, diodes, capacitors), or
a failure with the door interlock switches. See page 24
for door switch adjustment details.
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