Jenn-Air W27400, JJW9527, JJW8630, JJW8627 Components, Meat Probe, Probe Resistance VS. Temr Table

SECTION 1. COMPONENT DESCRIPTION

COMPONENTS

Meat Probe: Senses the internal tempera- ture of products during a baking function. The meat probe is an NTC, or negative temperature coefficient, which means the resistance value decreases as the tempera- ture increases. See meat probe chart below for resistance values.

	MEAT PROBE
Type:	Calibration:
NTC Thermistor	9938 ohms (150°F.)
PROBE RESISTANCE VS. TEMR TABLE
Degrees E	Resistance
122	18963 ohms
150	9938 ohms
156.2	8846 ohms
165.2	7456 ohms
210.1	3886 ohms

Membrane Switch: The means to make a switch contact, thus instructing the elec- tronic control system to perform a desired function. The membrane switch is a simple set of two contact surfaces containing conductive material, one on the back layer of MYLAR and the other on the front layer of MYLAR. There is also a center section of non-conductive MYLAR material that has a hole punched out of it at each switch con- tact position. The thickness of this spacer MYLAR determines the push force required to close the contacts between the front contact strip and the rear contact strip. Typically, the push force required to close a contact is 12 to 18 ounces.

Electronic Control: A programmable soft- ware component that controls oven, clock, timer and various other functions. The control maintains oven temperatures in either bake, broil, or clean. It is adjustable to maintain correct temperature offsets. It is also programmed with self-monitoring circuitry, which determines if a potential

unsafe condition is present, shuts the sys- tem down and displays the appropriate fault code. Fault codes are covered in product specifications sections 3 and 4.

Touch Sensor Technology: With this new technology a positive charge and negative charge is present around each pad. This creates an electrostatic field that emanates around, below, and through the glass front. When the consumer touches a key pad, this disturbs the electrostatic field and draws capacitance energy. This input is read by the module, which in turn signals the con- troller to respond, and the desired function is performed. In order for a function to be performed, a conductive material must

bridge the gap between the negative charge present at each pad.

Display Board: Displays time-of-day clock, oven temperatures, and any other function programmed into the electronic control system. The display board also acts as the input means from the membrane switch and sends those commands to the power relay board to process, implement, and monitor.

Power Relay Board: Contains the intelli- gence in the electronic control system and controls all oven functions, clock, timer, ,and various other consumer programmable inputs. The PRB has a relay mounted to it for each function it provides.

Oven Sensor: A device to monitor internal

oven temperature. The sensor has a PTC or positive temperature coefficient, or a resis- tance value that increases with temperature. Allows the electronic control to maintain a temperature setting through means of resistance matching with the control-se-

lected temperature. Example: The oven control is set at 350°F, the oven sensor resistance at room temperature is approxi- mately 1060 ohms. As the oven heats, the

16009721	COMPONENT DESCRIPTION	1-1
	_1999 Maytag Appliances Sales Company