10/24/2016
XML Service Manual
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2. When cooking time in the display window has elapsed, the oven turns off automatically by a control signal from the
digital programmer circuit.
2.4 Oven
The digital programmer circuit controls the ONOFF time of the heater in order to control oven cavity temperature.
1. After selecting desired oven cavity temperature and pressing [Start] pad, a high level signal comes out microcomputer
and applies to power relays, RY4 and RY5.
2. When RY4 & RY5 switch to ON, power source voltage is applied to the upper and lower heaters, and the heaters turn
on.
3. The digital programmer circuit senses the oven cavity temperature through oven temp sensor (thermistor). When the
oven temperature reaches the set temperature, DPC stops supplying high level signal to the power relays, and the
heaters turn off.
4. After the upper and lower heaters turn off, the oven temperature will continue increasing for a while and then decrease
as shown in Figure.
When the oven temperature drops below the set temperature, the digital programmer circuit senses the signal and
starts supplying a high level signal to power relays again.
2.5 Combination cook control
Combination cooking is accomplished by microwave and grill cooking (upper heater) being done synchronously during one
combination cooking cycle. One combination cooking cycle is 33 seconds.
1. During combination cooking, the digital programmer circuit controls power relay RY4 & RY5ʼs ONOFF time. In all three
combination cooking categories, power relay RY1 always stay on, but RY5ʼs ONOFF time as shown in Figure.
COMBINATION
CATEGORY GRILL(RY5)
MICROWAVE (RY1)
ON (sec.) OFF (sec.)
COMBINATION
CATEGORY GRILL(RY5)
MICROWAVE (RY1)
ON (sec.) OFF (sec.)
1
33
0
ON
2
24
9
ON
3
18
15
ON
2.6 IR reheat
The temperature of food being heated is detected by an infrared (IR) sensor and you do not have to set time.
2.6.1 How to read temperature by IR sensor
IR sensor can read food temperature without touching, IR rays are emitted from food. IR sensor is to generate temperature related
electric signal output and microcomputer is to convert actual temperature.
