Read Sharp R-28STM Service Manual online
IMPORTANT THINGS TO DO PRIOR TO CRITICAL PART
SERVICING
The following instructions are CRITICAL to the owner’s safety. Be sure to follow all the instructions. Contact the
manufacturer of distributor if you have any question.
1.1 If the oven is operative prior to servicing a Microwave Leakage Test (Microwave Emission Check) should be
performed prior to servicing the oven.
1.2 in the event that any microwave oven found to have microwave emission level in excess of 1 mW/cm
2
.The
following procedures should be followed:
a. Inform the distributor, importer, or manufacture the finding. Record it in the logbooks well.
b. Repair the unit at no cost to the owner.
c. Investigate the oven and ascertain the cause of the excessive leakage.
d. Hold the oven in your facility and instruct the owner not to use the unit until the oven has been brought into
compliance.
1.3 In the event that the oven operates with the door open. The following procedures should be followed:
a. Tell the user not to operate the oven.
b. Hold the oven in your facility until it is investigated and repaired.
c. Contact the manufacturer immediately.
2. Interlock Assembly Replacement and Adjustment
2.1
If you suspect defective primary, secondary or monitor interlock switches, use your ohmmeter(digital or analog
type the check the electrical continuity.
2.2
Make sure the power cord is pulled out and the high-voltage capacitor is discharged before the electrical
continuity check.
2.3
Set the ohmmeter to “Low Resistance” range and connect both leads (alligator clips) to the switch terminals.
2.4
Open the door and notice the meter reading. The primary or secondary interlock switch should show an “infinite”
resistance when the door is open. Replace it when it is defective. The monitor interlock should show a “zero or
near zero” resistance when the door is open. When the door is closed, the readings will be opposite.
2.5
If the oven has been received inoperative due to the failure of the monitored safety(primary and/or secondary)
interlock(s),you should replace all of the monitored safety interlock switched and the monitor switch.
3. Door and Hinge Replacement and Adjustment
3.1
Pull the power cord from the outlet. Check the door for warped or damaged areas. Check the hinges for broken
or worn areas. Check other areas such as cracked from glass, broken door latched, worn/cracked viewing
screen and etc.
3.2
After determining the door assembly should be replaced, check the parts list for the correct part number. All oven
door components must be ordered directly from the manufacturer or its authorized distributor.
4. Magnetron
Replacement
4.1
Check for the presence of the wire mesh gasket before installation.
4.2
Conduct a Microwave Leakage Test at the magnetron area prior to installing the top cover.
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