Read Sharp R-207 Service Manual online
R-207(SL)
R-207(W)
R-207(W)
7
A
MAGNETRON ASSEMBLY TEST
NEVER TOUCH ANY PART IN THE CIRCUIT WITH YOUR HAND OR AN INSULATED
TOOL WHILE THE OVEN IS IN OPERATION.
TOOL WHILE THE OVEN IS IN OPERATION.
1.
CARRY OUT 3D CHECKS.
2. To test for an open filament, isolate the magnetron from the high voltage circuit. A continuity
check across the magnetron filament leads should indicate less than 1 ohm.
3. To test for a shorted magnetron, connect the ohmmeter leads between the magnetron filament
leads and chassis ground. This test should indicate an infinite resistance. If there is little or no
resistance the magnetron is grounded and must be replaced.
resistance the magnetron is grounded and must be replaced.
4. Reconnect all leads removed from components during testing.
5. Reinstall the outer case (cabinet).
6. Reconnect the power supply cord after the outer case is installed.
7. Run the oven and check all functions.
5. Reinstall the outer case (cabinet).
6. Reconnect the power supply cord after the outer case is installed.
7. Run the oven and check all functions.
MICROWAVE OUTPUT POWER
The following test procedure should be carried out with the microwave oven in a fully assembled
condition (outer case fitted).
The power output of this oven is rated using the method specified by IEC 60705. Full details of
how to curry out this procedure can be found in the Sharp Technical Training notes which is
available from Sharp Parts Centre (part number SERV-LITMW01).
The following test procedure should be carried out with the microwave oven in a fully assembled
condition (outer case fitted).
The power output of this oven is rated using the method specified by IEC 60705. Full details of
how to curry out this procedure can be found in the Sharp Technical Training notes which is
available from Sharp Parts Centre (part number SERV-LITMW01).
The IEC60705 procedure must be carried out using laboratory-type procedures and
equipment.
These requirements make the procedure unsuitable for routine performance checks.
equipment.
These requirements make the procedure unsuitable for routine performance checks.
NOTE: The following test method gives an indication of the output power only, it cannot be
used to establish the actual/rated output power. If the true output power is required,
then the IEC60705 test method must be used.
then the IEC60705 test method must be used.
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 1 minute and 48 seconds on full
power.
NOTE: The operation time of microwave oven includes "3" sec. (3 sec. is magnetron
filament heat-up time.)
4. When the 1 minute and 48 seconds 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 80.
NOTE: The result from this test should be within the allowance of 2000cc alternative
method.
(
(
±
10%).
MICROWAVE LEAKAGE TEST
This oven should be tested for microwave leakage on completion of any repair or adjustment,
following the procedure described in the Sharp Technical Training notes (part number SERV-
LITMW01). The maximum leakage permitted in BS EN 60335-2-25 is 50W/m
following the procedure 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 5W/
m
2
), however it is not normal to detect any significant leakage, therefore, any leakage which is
detected should be investigated.
It is essential that only leakage detectors with current calibration traceable to National Physical
Laboratories are used.
Laboratories are used.
Suitable leakage detectors: CELTEC A100
APOLLO X1
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
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