Sensor reheat, Thermistor | Panasonic NN-ST678S, NN-SD698S specification

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 themicrowave oven to switch to T2 time after the 10second 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 T2time, 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 second period. The coefficient K is 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 × K

=2 min. and 40 sec. × 0.1

=160sec. × 0.1

=16 sec.

Category	P1	P2	K Factor
	Power	Power	Standard
Oatmeal	HIGH	HIGH	0.1

NN-SD698S / NN-ST678S / NN-ST658W

2.5.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.

Category	P1	P2	K Factor
	Power	Power	Standard
Sensor Reheat	HIGH	MEDIUM	0.3

2.6.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	T2 TIME (Remainingcooking time)
1 Min. 30 Sec. ~ 4 Min.	27 Sec. ~ 1Min.12 Sec.

2.7.Thermistor

The thermistor which fixed on magnetron detects magnetron temperature and make power down when the temperature becomes abnormal high. A normal thermistor´s resistance values for temperature ranges between 75-85 degree F is from 37kΩ to 57kΩ.

NN-ST658W, NN-ST678S, NN-SD698S specifications

The Panasonic NN-SD688S and NN-SD698S are two high-performance microwave ovens designed to meet the needs of modern households. With cutting-edge technology and innovative features, these models offer a convenient way to heat, cook, and defrost a variety of foods.

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The microwaves come equipped with an array of smart cooking features, including the Sensor Cook function. This technology automatically detects the steam released from food and adjusts cooking time and power levels accordingly. This feature takes the guesswork out of microwave cooking, ensuring perfectly cooked meals without constant monitoring.

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