Amana RSS - Manual (Page 38)

OPERATION AND SERVICE PROCEDURES
Electronic Range Control (ERC) (Models w/ Two Piece Control)
37 RC231002 Rev. 3
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.
3. To check the transformer secondary winding output
voltage (used to drive relays), shut off power to the
range and insert your AC voltmeter leads into the J1
connector at pins J1-6 and J1-5 and turn on power to
the appliance. A voltage reading of approximately
20.3 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.
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.
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.
7. To check the broil relay contacts, shut off power to the
range and attach your AC voltmeter leads to the relay
board terminals E4 and E5 and turn on power to the
range. A voltage reading of approximately 120 VAC
should be indicated. Program the ERC for a broil
operation. When the ERC initiates the broil 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.
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.)