GE JES2251SJ Technical Service Manual

Also see for Profile JES2251SJ: Owner's manual Datasheet Datasheet

Contents

10AUTO SENSOR COOKING/REHEAT PROCESSExplanation of the Auto Sensor Cooking process1. During the first 10 second period there is nomicrowave activity. When calculating the T2 timeby using the formula below make sure this 10seconds is subtracted from the T1 time. In otherwords, T1 time starts at the end of the 10 secondperiod.2. T1 time The total amount of time it takes themicrowave oven to switch to T2 time after the 10second period.3. T2 time When the steam escapes from the cookingcontainer placed in the oven, the steam sensordetects it and the microprocessor calculates thebalance of cooking time. This T2 time is thenshown in the display and begins counting down.Balance of cooking time (T2 time)The balance of cooking time which is called T2time, can be calculated by the following formula.T2 time (in sec.) = T1 time X K factorNOTE:Remember, the T1 time starts after the 10s 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 sprogrammed into the microprocessor memoryand they are listed in the following tables alongwith the P1 and P2 powers.NOTE:When "More" or "Less" pad is selected, the Kfactor varies resulting in T2 time to beincreased or decreased.Example of calculating the T2 timeExample 1: If the T1 time is measured to be 2 minutesand 40 seconds after the 10 second period, and theAuto program selected is Oatmeal:T2 = T1 X K= 2 min. and 40 sec. X 0.2= 160sec. X 0.2= 32 sec.Category P1 P2 K FactorPower Power StandardCategory P1 P2 K FactorPower Power StandardOatmeal HIGH HIGH 0.25.5. Sensor reheatAuto Sensor Reheat is a quick and easy way to reheatrefrigerated and room temperature foods.Simply press the reheat pad. There is no need toselect power level and cooking time.NOTE:The Auto Sensor Reheat process is same asAuto Sensor Cooking process.5.6. Steam sensor and digital programmercircuitIn order to determine if the steam sensor function ofthe digital programmer circuit is working, do thefollowing test.5.7. Thermistor1. 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 4minutes after the Start pad is tapped.5. T1 time cooking automatically switches toremaining time for cooking (T2).6. The remaining cooking time (T2) appears indisplay window. If the following cooking timeappears, Steam Sensor function is normal.T1 TIME T2 TIME (Remainingcooking time)1 Min. 30 Sec. ~ 4 Min. 18 Sec. ~ 48 Sec.The thermistor which fixed on magnetron detectsmagnetron temperature and make power downwhen the temperature becomes abnormal high. An 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 rtemperature ranges between 75-85 degree F isfrom 37k to 57kSensor Reheat HIGH MEDIUM 0.3