MICROWAVE OVEN
MW6574W
SERVICE
Manual
MICROWAVE OVEN
CONTENTS
1. Precaution
2. Specifications
3. Operating Instructions
4. Disassembly and Reassembly
5. Alignment and Adjustments
6. Troubleshooting
7. Exploded Views and Parts List
8. PCB Diagrams
9. Schematic Diagrams
SAMIL CO.
One
Minute
+
Help
Screen
Baby
Food
Frozen
Dinner
CustomIICustom
I
Potoato
Fresh
Vegetable
Power
Level
Auto Start
Hold
Timer
More
Less
123
456
7
8
9
0
Auto
Defrost
Auto
Reheat
Clock
Sound
Pause
Cancel
Start
Diet
Cook
Popcorn
Samsung Electronics
(a) Do not operate or allow the oven to be
operated with the door open.
(b) Make the following safety checks on
all ovens to be serviced before activating
the magnetron or other microwave
source, and make repairs as necessary:
(1) Interlock operation,
(2) proper door closing,
(3) seal and sealing surfaces (arcing,
wear, and other damage),
(4) damage to or loosening of hinges
and latches,
(5) evidence of dropping or abuse.
(c) Before turning on microwave power
for any service test or inspection within
the microwave generating
compartments, check the magnetron,
wave guide or transmission line, and
cavity for proper alignment, integrity,
and connections.
(d) Any defective or misadjusted
components in the interlock, monitor,
door seal, and microwave generation
and transmission systems shall be
repaired, replaced, or adjusted by
procedures described in this manual
before the oven is released to the owner.
(e) A Microwave leakage check to verify
compliance with the Federal
performance standard should be
performed on each oven prior to release
to the owner.
PRECAUTIONS TO BE OBSERVED BEFORE AND DURING
SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE
MICROWAVE ENERGY
1. Precaution
1-1 Safety precautions ( )
Samsung Electronics 1-1
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. 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 immediatly.
4. Notify the Central Service Center if the
microwave leakage exceeds 5 mW/cm
2
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 found
to have emmission 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.
13. Design Alteration Warning:
Use exact replacement parts only, i.e.,
only those that are specified in the
drawings 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.10.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
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.
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.
17. When checking the continuity of the witches
or transformer, always make sure that the
power is OFF, and one of the lead wires is
disconnected.
18. Components that are critical for safety are
indicated in the circuit diagram by
shading, or .
19. Use replacement components that have the
same 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.
1. High Voltage Warning
Do not attempt to measure any of the high
voltages--this includes the filament voltage
of the magnetron. High voltage is present
during any cook cycle.
Before touching any components or wiring,
always unplug the oven and discharge the
high voltage capacitor (See Figure 1-1)
2. The high-voltage capacitor remains charged
about 30 seconds after disconnection. Short
the negative terminal of the high-voltage
capacitor to the oven chassis. (Use a
screwdriver.)
3. High voltage is maintained within specified
limits by close-tolerance, safety-related
components and adjustments. If the high
voltage exceeds the specified limits, check
each of the special components.
1-2
Pretaution
Samsung Electronics
1-2 Special Servicing Precautions (Continued)
1-3 Special High Voltage Precautions
PRECAUTION
Servicemen should remove their watches whenever
working close to or replacing the magnetron.
PRECAUTION
There exists HIGH VOLTAGE ELECTRICITY with high
current capabilities in the circuits of the HIGH VOLTAGE
TRANSFORMER secondary and filament terminals. It is
extremely dangerous to work on or near these circuits
with the oven energized.
DO NOT measure the voltage in the high voltage circuit
including filament voltage of magnetron.
PRECAUTION
Never touch any circuit wiring with your hand nor with
uninsulated tool during operation.
Touch chassis ground first then short to the high
voltage capacitor terminal by using screwdriver or
jumper wire.
H. V. Capacitor
H. V. Diode
Short
2. Specifications
2-1 Table of Specifications
Samsung Electronics 2-1
MODEL MW6574W
ITEM
TIMER 99 MINUTES 99 SECONDS
POWER SOURCE 220V/60HZ, AC
POWER CONSUMPTION MICROWAVE : 1,500W
OUTPUT POWER FROM 100W TO 1000W (10 LEVEL POWER)
(IEC-705 TEST PROCEDURE)
OPERATING FREQUENCY 2,450MHz
MAGNETRON OM75PH(31)ESS
COOLING METHOD COOLING FAN MOTOR
OUTSIDE DIMENSIONS 21
29/32
(W) x 12
11/32
(H) x 16
28/32
(D)
NET WEIGHT 40.8lbs.
SHIPPING WEIGHT 46.3 lbs
3-1 Samsung Electronics
One
Minute
+
Help
Screen
Popcorn
Diet
Cook
Baby
Cook
Frozen
Dinner
Custom ICustom
II
Potoato
Fresh
Vegetable
Power
Level
Auto Start
Hold
Timer
More
Less
1 2 3
4 5 6
7
8
9
0
Auto
Defrost
Auto
Reheat
Clock
Sound
Pause
Cancel
Start
One Minute + Button
Instant Cook Button
Auto Defrost Button
Auto Reheat Button
Number Key Button
Start Button
Sound Button
Clock / Auto Start Button
Hold / Timer Button
Power Level Button
More / Less Button
Pause / Cancel Button
3. Operating Instructions
3-1 Control Panel
3-2 Features & External Views
Door
Ventilation Holes
Light
Safety Interlock Holes
Control Panel
Open Door Push Button
Guide Roller
Glass Tray
Door Latches
One
Minute
+
Help
Screen
Popcorn Diet
Cook
Baby
Food
Frozen
Dinner
Custom
ll
Potoato
Fresh
Vegetable
Custom
l
Power
Level
Auto Start
Hold
Timer
More
Less
1 2 3
4 5 6
7
8
9
0
Auto
Defrost
Auto
Reheat
Clock
Sound
Pause
Cancel
Start
556mm
402mm
313mm
260mm
429mm
One
Minute
+
Help
Screen
Popcorn
Baby
Food
Frozen
Dinner
Diet
Cook
CustomIICustom
I
Potoato
Fresh
Vegetable
Power
Level
Auto Start
Hold
Timer
More
Less
1 2 3
4 5 6
7
8
9
0
Auto
Defrost
Auto
Reheat
Clock
Sound
Pause
Cancel
Start
Help Screen Button
4. Disassembly and Reassembly
4-1 Replacement of Magnetron, Motor Assembly and Lamp
Samsung Electronics 4-1
Remove the magnetron including the shield case,
permanent magnet, choke coils and capacitors (all
of which are contained in one assembly).
1. Disconnect all lead wires from the magnetron
and lamp.
2. Remove the air cover.
3. Remove screws securing the magnetron to the
wave guide.
4. Take out the magnetron very carefully.
5. Remove tow screws from the back panel of fan
motor assembly.
6. Take out the fan motor assembly.
7. Remove the oven lamp by pulling out from hole
of air cover.
NOTE1: When removing the magnetron, make
sure that its antenna does not hit any
adjacent parts, or it may be damaged.
NOTE2: When replacing the magnetron, be sure to
remount the magnetron gasket in the
correct position and make sure the
gasket is in good condition.
1. Discharge the high voltage capacitor.
2. Disconnect all the leads.
3. Remove the mounting bolts.
4. Reconnect the leads correctly and firmly.
4-2 Replacement of High Voltage Transformer
Lamp
Cover Air
Magnetron
H. V. Trans
H. V. Capacitor
Thermo S/W
Fan Motor
Screw
H. V. Trans
Bolts