GE JES2251SJ Technical Service Manual page 10

AUTO SENSOR COOKING/REHEAT PROCESS
Explanation of the Auto Sensor Cooking process
1. During the first 10 second period there is no
microwave activity. When calculating the T2 time
by using the formula below make sure this 10
seconds is subtracted from the T1 time. In other
words, T1 time starts at the end of the 10 second
period.
2. T1 time The total amount of time it takes the
microwave oven to switch to T2 time after the 10
second period.
3. T2 time When the steam escapes from the cooking
container placed in the oven, the steam sensor
detects it and the microprocessor calculates the
balance of cooking time. This T2 time is then
shown in the display and begins counting down.
Balance of cooking time (T2 time)
The balance of cooking time which is called T2
time, can be calculated by the following formula.
T2 time (in sec.) = T1 time X K factor
NOTE:
Remember, the T1 time starts after the 10
s e c o n d p e r i o d . T h e c o e f f i c i e n t K i s
programmed into the microprocessor memory
and they are listed in the following tables along
with the P1 and P2 powers.
NOTE:
When "More" or "Less" pad is selected, the K
factor varies resulting in T2 time to be
increased or decreased.
Example of calculating the T2 time
Example 1: If the T1 time is measured to be 2 minutes
and 40 seconds after the 10 second period, and the
Auto program selected is Oatmeal:
T2 = T1 X K
= 2 min. and 40 sec. X 0.2
= 160sec. X 0.2
= 32 sec.
P1
Category
Power
Oatmeal HIGH
5.5. Sensor reheat
Auto Sensor Reheat is a quick and easy way to reheat
refrigerated and room temperature foods.
Simply press the reheat pad. There is no need to
select power level and cooking time.
NOTE:
The Auto Sensor Reheat process is same as
Auto Sensor Cooking process.
P1
Category
Power
Sensor Reheat HIGH
5.6. Steam sensor and digital programmer
circuit
In order to determine if the steam sensor function of
the digital programmer circuit is working, do the
following test.
1. Place a water load (150 cc) in the oven.
2. Tap Sensor Reheat pad.
3. Tap Start pad.
4. Steam Sensor detects steam about 1.5 to 4
minutes after the Start pad is tapped.
5. T1 time cooking automatically switches to
remaining time for cooking (T2).
6. The remaining cooking time (T2) appears in
display window. If the following cooking time
appears, Steam Sensor function is normal.
T1 TIME
1 Min. 30 Sec. ~ 4 Min.
5.7. Thermistor
The thermistor which fixed on magnetron detects
magnetron temperature and make power down
when the temperature becomes abnormal high. A
n o r m a l t h e r m i s t o r ' s r e s i s t a n c e v a l u e s f o r
temperature ranges between 75-85 degree F is
from 37k to 57k
10
P2 K Factor
Power Standard
HIGH 0.2
P2 K Factor
Power Standard
MEDIUM 0.3
T2 TIME (Remaining
cooking time)
18 Sec. ~ 48 Sec.