Amana RSS, RST service manual Testing with Voltage Applied, Erc Oven Temperature Sensor

OPERATION AND SERVICE PROCEDURES

Electronic Range Control (ERC) (Models w/ Two Piece Control)

TO AVOID THE RISK OF ELECTRIC SHOCK, PERSONAL INJURY OR DEATH DISCONNECT POWER BEFORE SERVICING, UNLESS TESTING REQUIRES IT.

Testing with Voltage Applied

The relay/power supply circuit board voltages can be tested by following the procedures below. Caution should always be taken when making live voltage tests to avoid electrical shock and/or damage to range components or test equipment.

1.To check the input supply voltage to the transformer primary winding, shut off power to the range and connect your AC voltmeter to terminals E1 and E2. Turn on power to the range. A voltage reading of approximately 108-132 VAC should be indicated. If a low voltage or no reading is indicated, check for loose connections or broken wiring.

2.To check the transformer secondary winding output (filament) voltage, shut off power to the range and insert your AC voltmeter leads into the J1 connector at pins J1-7 and J1-8 and turn on power to the appliance. A voltage reading of approximately 3.2 VAC should be indicated. If no voltage is indicated, recheck primary input voltage (Step 1). If primary input voltage checks good, replace the relay/power supply board.

5.To check the broil relay drive voltage supplied to the relay/power supply board from the ERC, shut off power to the range and insert your DC voltmeter leads into the J1 connector at pins J1-3 and J1-1 and turn on power to the range. With no bake or broil operation programmed into the ERC, zero (0) VDC should be indicated. Program the ERC for a broil operation. When the ERC initiates the broil program, a voltage reading of approximately 24 VDC should be indi- cated. If no voltage is indicated, check for loose connections or broken wiring, and also for drive voltage at the ERC J1 connector at pins J1-8 and J1- 5.

6.To check the bake relay contacts, shut off power to the range and attach your AC voltmeter leads to the relay board terminals E6 and E7 and turn on power to the range. A voltage reading of approximately 120 VAC should be indicated. Program the ERC for a bake operation.

When the ERC initiates the bake function, the voltage reading should drop to zero (0) VAC. If the voltage does not drop to zero (0) VAC, the relay is not being energized or the relay is defective.

3. To check the transformer secondary winding output 7.	To check the broil relay contacts, shut off power to the
voltage (used to drive relays), shut off power to the	range and attach your AC voltmeter leads to the relay
range and insert your AC voltmeter leads into the J1	board terminals E4 and E5 and turn on power to the
connector at pins J1-6 and J1-5 and turn on power to	range. A voltage reading of approximately 120 VAC
the appliance. A voltage reading of approximately	should be indicated. Program the ERC for a broil
20.3 VAC should be indicated. If no voltage is	operation. When the ERC initiates the broil function,
indicated, recheck primary input voltage (Step 1). If	the voltage reading should drop to zero (0) VAC. If the
primary input voltage checks good, replace the relay/	voltage does not drop to zero (0) VAC, the relay is not
power supply board.	being energized or the relay is defective.

4.To check the bake relay drive voltage supplied to the relay/power supply board from the ERC, shut off power to the range and insert your AC voltmeter leads into the J1 connector at pins J1-2 and J1-1 and turn on power to the range. With no bake operation programmed into the ERC, zero (0) VDC should be indicated. Program the ERC for a bake operation. When the ERC initiates the bake program, a voltage reading of approximately 24 VDC should be indi- cated. If no voltage is indicated, check for loose connections or broken wiring, and also for drive voltage at the ERC J1 connector at pins J1-9 and J1- 5.

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ERC OVEN TEMPERATURE SENSOR

The oven temperature sensor is mounted in the oven cavity and electrically connected to the J2 connector, pins 1 and 3 on the rear of the ERC. The sensor resistance changes with temperature changes inside the oven cavity and the ERC controls the oven temperature by reacting to the sensor resistance changes.

The sensor resistance can be checked by removing the sensor interconnect harness plug from the ERC J2 connec- tor and inserting the ohmmeter leads into the harness connector plug. A resistance reading of 1091 ± 5.5 ohms should be indicated at ambient room temperature (75°F.)

RC231002 Rev. 3