Samsung MG23J5133AK Service Manual page 4

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
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 voltages.
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 compliance.
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:
Primary, door sensing switch and power relay, as
well as the Interlock Monitor Switch. The correct
adjustment of these switches is described elsewhere
in this manual. Make sure that the fuse has the
correct rating for the particular model being repaired.
This document can not be used without Samsung's authorization.
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13. Design Alteration Warning: Use exact replacement
14. Never defeat any of the B+ voltage interlocks. Do not
15. Some semiconductor ("solid state") devices are easily
16. Always connect a test instrument's ground lead to
17. When checking the continuity of the witches or
18. Components that are critical for safety are indicated
19. Use replacement components that have the same
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parts only, i.e.,only those that are specified in
thedrawings and parts lists of this manual. This
is especially important for the Interlock switches,
described above. Never alter or add to the mechanical
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.
apply AC power to the unit (or any of its assemblies)
unless all solid-state heat sinks are correctly
installed.
damaged by static electricity. Such components are
called Electrostatically Sensitive Devices (ESDs).
Examples include integrated circuits and field-
effect transistors. Immediately before handling any
semiconductor components or assemblies, drain the
electrostatic charge from your body by touching a
known earth ground.
the instrument chassis ground before connecting the
positive lead; always remove the instrument's ground
lead last.
transformer, always make sure that the power is OFF,
and one of the lead wires is disconnected.
in the circuit diagram by shading,
ratings, especially for flame resistance and dielectric
strength specifications. A replacement part that
does not have the same safety characteristics as the
original might create shock, fire or other hazards.
NOTE : Connect the oven to a 20A. When connecting
the oven to a 15A,make sure that circuit breaker can
operate.
or .