Magnetron Thermal Cutout; Sensor - Samsung SMH7174WE Service Manual

5-9-5 Magnetron Thermal Cutout

The magnetron thermal cutout is located above the
leads to the magnetrons. It is designed to prevent
damage to the magnetron if an overheated condition
develops in the tube to cooling fan failure, obstructed
air ducts, dirty or blocked air intake.
Under normal operation, the magnetron thermal cutout
remains closed. However, when abnormally high
temperatures are reached within the magnetron, the
magnetron thermal cutout will open at 320°F(160°C)
causing the oven to shut down. After the temperature
drops to 140°F(60°C) it will reset and cooking will be
able to resume.
To Remove Magnetron Thermal Cutout :
1. See 'Removing Magnetron'.

5-10 Sensor

The Sensor Cooking Function uses a special humidity
sensor which detects humidity during the cooking
process. Before conducting either of the sensor
tests below, ensure the unit is plugged into a wall
outlet for at least 5 minutes. If already plugged
in, proceed. The sensor is a plug-in device
located in the vent area at the top left hand
corner of the cavity behind the grille.
To Service :
1. Disconnect power and remove grille.
2. Remove the sensor by removing screws.
3. Mount the new sensor to the duct.
SENSOR TEST (QUICK TEST)
1. With 2 fingers touch and hold the following pads at the same time :
Auto Defrost
2. Observe diagnostic number in display (Numbers approximate)
ex) 33 (Vs) 39 (Vout)
● Vout Vaule : 10~150 (Normal-verify with "detection test" )
● Over 150 or Less than 10 (Sensor failed. Check connection of Sensor.)
Sensor Error Code.
E61 - Open error. Sensor unpluged, wiring or smart board
E62 - Short error. Shorted sensor or smart board
and
Sensor Reheat
MAGNETRON THERMAL CUTOUT
HUMIDITY SENSOR
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MAGNETRON
VENT MOTOR