Sharp R-9320 Service Manual page 37

TEST PROCEDURES KONT'D)
R-9320
R-9450
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/ PROCEDURE :
LETTER
COMPONENT TEST
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1
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M
TEMPERATURE PROBE TEST (R-9450 ONLY)
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1 Disconnect the temperature probe from the unit, and check for the continuity of the probe, connecting an :
/ ohmmeter to its plug.
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On the R x 1 kilo-ohm scale, the resistance of the probe should be approx. 42.6 to 58.0 kilo-ohms at room
' temperature 25'C, and approx. 3.7 to 4.1 kilo-ohms at 93°C .
, To check the resistance at 93'C, proceed as follows:
/
' 1. Fill 9 ounces (275 milliliters) of tap water in a 2 cup measuring cup, and place the temperature probe
into the water.
2. Place the container and probe in the center of the oven cavity.
3. Connect the probe to the receptacle which is provided at the top of oven cavity.
4. Close the door.
5. Set the cooking temperature to 93°C and touch the cook pad.
6. Approximately 4 minutes later, the cook cycle will be completed.
At this-time, the temperature of
water should be approximately 93°C.
7. Disconnect the probe from the receptacle and check for the resistance of probe immediately.
If the resistance differs from the above, the probe should be replaced.
N TOUCH CONTROL PANEL ASSEMBLY TEST
The touch controi panel consists of circuits including semiconductors such as LSI, ICs, etc. Therefore,
unlike the conventional microwave ovens, proper maintenance cannot be performed with only a voltmeter
and ohmmeter. Refer to the "TOUCH CONTROL PANEL ASSEMBLY".
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