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1. Precaution
Follow these special safety precautions. Although the microwave oven is completely safe during ordinary use,
repair work can be extremely hazardous due to possible exposure to microwave radiation, as well as potentially
lethal high voltages and currents.
1-1 Safety precautions (
1. All repairs should be done in accordance with the
procedures described in this manual. This product
complies with Federal Performance Standard 21
CFR Subchapter J(DHHS).
2. Microwave emission check should be performed
to prior to servicing if the oven is operative.
3. If the oven operates with the door open :Instruct
the user not to operate the oven and contact the
manufacturer and the center for devices and
radiological health immediately.
4. Notify the Central Service Center if the
microwave leakage exceeds 5 mW/cm2.
5. Check all grounds.
6. Do not power the MWO from a "2-prong"
AC cord. Be sure that all of the built-in
protective devices are replaced. Restore any
missing protective shields.
7. When reinstalling the chassis and its
assemblies, be sure to restore all protective
devices, including: nonmetallic control
knobs and compartment covers.
8. Make sure that there are no cabinet openings
through which people --particularly children
--might insert objects and contact dangerous volt-
ages. Examples: Lamp hole,ventilation slots.
9. Inform the manufacturer of any oven foundto
have emission in excess of 5 mW/cm2 ,Make
repairs to bring the unit into compliance at no cost
to owner and try to determine cause.Instruct owner
not to use oven until it has been brought into com-
pliance.
CENTRAL SERVICE CENTER
10. Service technicians should remove their watches
while repairing an MWO.
)
11. To avoid any possible radiation hazard,replace
parts in accordance with the wiring diagram. Also,
use only the exact replacements for the following
parts: Primary and secondary interlock switches,
interlock monitor switch.
12. If the fuse is blown by the Interlock Monitor Switch:
Replace all of the following at the same time: Pri-
mary, door sensing switch and power relay, as well
as the Interlock Monitor Switch. The correct adjust-
ment of these switches is described elsewhere in
this manual. Make sure that the fuse has the cor-
rect rating for the particular model being repaired.
13. Design Alteration Warning:Use exact replace-
ment parts only, i.e.,only those that are specifi ed in
thedrawings and parts lists of this manual. This is
especially important for the Interlock switches, de-
scribed above. Never alter or add to the mechani-
cal or electrical design of the MWO. Any design
changes or additions will void the manufacturer's
warranty. Always unplug the unit's AC power cord
from the AC power source before attempting to
remove or reinstall any component or assembly.
14. Never defeat any of the B+ voltage interlocks.
Do not apply AC power to the unit (or any of its
assemblies) unless all solid-state heat sinks are
correctly installed.
15. Some semiconductor ("solid state") devices are
easily damaged by static electricity. Such compo-
nents are called Electrostatically Sensitive Devices
(ESDs). Examples include integrated circuits and
fi eld-effect transistors. Immediately before handling
any semiconductor components or assemblies,
drain the electrostatic charge from your body by
touching a known earth ground.
16. Always connect a test instrument's ground lead to
the instrument chassis ground before connecting
the positive lead; always remove the instrument's
ground lead last.
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