Panasonic NN-J993 Service Manual page 6

5.4. Combination cooking control
Combination cooking is accomplished by microwave and
convection cooking being done alternately during one
combination cooking cycle. One combination cooking cycle is
22 seconds.
1. During combination cooking, the digital programmer circuits
ON-OFF time of both heater and magnetron shown in Figure.
NOTE 1: Note that the heater may not be on during a heater
on period if the preporgrammed oven temperture has been
reached. This is due to the fact that the oven is keeping the
preporgrammed oven temperature constant, so of course
5.5. Sensor reheating
The temperature of the foods being heated is detected by an
infrared (IR) sensor and you do not have to set the temperature
or time.
5.5.1. How to read temperature by IR
sensor
IR sensor can read food temperature without touching, IR rays
emitted from food. IR sensor to generate temperature related
electric signal output and micro-computer to convert actual
temperature.
5.5.2. Operation
IR sensor is mounted top back of oven cavity through the hole.
It scans all over cooking shelf. IR sensor has 8 eyes and can be
the heater will only be on when it is needed and off when
it is not needed.
NOTE 2: As for temperatures of combination cooking for
convection, the temperatures by each program are
preporgrammed in the microprocessor as shown in Figure.
read oven shelf front to back at the time. Then IR sensor is
design to scan right to left to cover all over shelf. (19 points)
13
NN-J993