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R-952M - 6
3. Once the fire sensor feature has shut the unit down,
the programmed cooking cycle may be resumed by
pressing the "START" pad or the unit may be reset by
pressing the "CLEAR" pad.
pressing the "START" pad or the unit may be reset by
pressing the "CLEAR" pad.
CONVECTION
MOTOR
THERMISTOR
Sensing
Voltage
ON
OFF
ON
OFF
ON
OFF
0
21
27 29
64 (sec.)
Sensing the voltage across temperature measurement circuit.
6 sec.
3 sec.
MICROWAVE OUTPUT POWER (IEC-705)
The power output of this oven is rated using the method specified by IEC-705. Full details of how to carry out this
procedure can be found in the Sharp Technical Training notes which is available from Sharp Parts Centre
(part number SERV-LITMW01).
procedure can be found in the Sharp Technical Training notes which is available from Sharp Parts Centre
(part number SERV-LITMW01).
Using this procedure, the heating time to raise 1000g of water by 10
°
C is approximately 50 seconds.
The IEC-705 procedure must be carried out using laboratory-type procedures and equipment. These requirements
make the procedure unsuitable for routine performance checks. An indication of the power being produced by the
oven
can however be obtained using the procedure given below.
make the procedure unsuitable for routine performance checks. An indication of the power being produced by the
oven
can however be obtained using the procedure given below.
Alternative simplified method:
1. Place 2 litres of cold water (between 12
1. Place 2 litres of cold water (between 12
°
C and 20
°
C) in a suitable container.
2. Stir the water and measure the temperature in
°
C. Note temperature as T1.
3. Place the container in the microwave and heat the water for 2 minutes on full power.
4. When the 2 minutes is completed, remove the container and stir the water. Note the water temperature as T2.
5. Calculate the output power using the following formula:
4. When the 2 minutes is completed, remove the container and stir the water. Note the water temperature as T2.
5. Calculate the output power using the following formula:
R.F. Power Output = (T2 - T1) x 70.
Note:
The result from this test should be within 10% of the power rating stated on the rating label.
MICROWAVE LEAKAGE TEST
This oven should be tested for microwave leakage on completion of any repair or adjustment, following the proce-
dure described in the Sharp Technical Training notes (part number SERV-LITMW01). The maximum leakage
permitted in BS EN 60335-2-25 is 50W/m
dure described in the Sharp Technical Training notes (part number SERV-LITMW01). The maximum leakage
permitted in BS EN 60335-2-25 is 50W/m
2
(equivalent to 5mW/cm
2
), however it is not normal to detect any signifi-
cant leakage, therefore, any leakage which is detected should be investigated.
It is essential that only leakage detectors with current calibration traceable to the National Physical Laboratories are
used.
used.
Suitable leakage detectors :
CELTEC A100
APOLLO X1
APOLLO X1
FUNCTION OF IMPORTANT COMPONENTS
THERMISTOR OPEN CIRCUIT
1. If the temperature of the thermistor does not rise to
more than 40˚C after 4 minutes and 15 seconds
from when the oven is started in convection, grill or
dual cooking (Microwave and Convection) mode,
the oven is turned off.
from when the oven is started in convection, grill or
dual cooking (Microwave and Convection) mode,
the oven is turned off.
2. When the thermistor or the wire harness to the
thermistor is opened, the oven is turned off after 4
minutes and 15 seconds because this condition is
same as above.
minutes and 15 seconds because this condition is
same as above.
OUTPUT POWER TEST PROCEDURE
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