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MICROWAVE OVEN
BASIC : GE87W
MODEL : MW87W-S
MODEL CODE : MW87W-S/XEG
SERVICE Manual
MICROWAVE OVEN FEATURES
1. Cost Reduction for 0.8 cu.ft of Volume
2. Competitive Price
Refer to the service manual in the itself (http://itself.sec.samsung.co.kr/) for the more information.
Contents
1. Precaution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
1-1 Safety precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
1-2 Special Servicing Precautions (Continued) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
1-3 Special High Voltage Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
2. Product Specifications & Comparison Charts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
2-1 Table of Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
3. Operating Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
3-1 Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
3-2 Features & External Views . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
3-3 Accessory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
4. Disassembly and Reassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
4-1 Replacement of Magnetron, Motor Assembly and Lamp. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
4-2 Replacement of High Voltage Transformer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
4-3 Replacement of Door Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
4-3-1 Removal of Door "C" . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
4-3-2 Removal of Door "E" . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
4-3-3 Removal of Key Door & Spring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
4-3-4 Reassembly Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
4-4 Replacement of Fuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
4-5 Replacement of Drive Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
4-6 Replacement of Control Circuit Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
4-6-1 Removal of Control Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
4-6-2 Removal of Ass'y P.C.B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
4-6-3 Removal of Key Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
5. Alignment and Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5-1 High Voltage Transformer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5-2 Low Voltage Transformer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5-3 Magnetron . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5-4 High Voltage Capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
5-5 High Voltage Diode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
5-6 Main Relay and Power Control Relay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
5-7 Adjustment of Primary Switch, Door Sensing Switch and Monitor Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5-8 Output Power of Magnetron . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
5-9 Microwave Heat Distribution - Heat Evenness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
5-10 Procedure for Measurement of Microwave Energy Leakage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
5-11 Check for Microwave Leakage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
5-12 Note on Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
5-13 Leakage Measuring Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
6. Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
6-1 Electrical Malfunction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
6-2 Error Code Numbering Rule . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
7. Exploded Views and Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
7-1 Exploded Views . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
7-2 Main Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
7-3 Control & Door Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
7-4 Standard Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
8. Schematic Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
9. P.C.B Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
10. Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
11. Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
11-1 Model name standard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
11-2 Customer inquiry cases and countermeasures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
-2-
PRECAUTIONS TO BE OBSERVED BEFORE AND
DURING SERVICING TO AVOID POSSIBLE
EXPOSURE TO EXCESSIVE MICROWAVE ENERGY
(a) Do not operate or allow the oven to be (c) Before turning on microwave power for
operated with the door open. any service test or inspection within the
(b) Make the following safety checks on all microwave generating compartments,
ovens to be serviced before activating the check the magnetron, wave guide or
magnetron or other microwave source, transmission line, and cavity for proper
and make repairs as necessary: alignment, integrity, and connections.
(1) Interlock operation, (d) Any defective or misadjusted components
(2) proper door closing, in the interlock, monitor, door seal, and
(3) seal and sealing surfaces (arcing, microwave generation and transmission
wear, and other damage), systems shall be repaired, replaced, or
(4) damage to or loosening of hinges and adjusted by procedures described in this
latches, manual before the oven is released to the
(5) evidence of dropping or abuse. 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.
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 11. To avoid any possible radiation hazard, replace
procedures described in this manual. This product parts in accordance with the wiring diagram. Also,
complies with Federal Performance Standard 21 use only the exact replacements for the following
CFR Subchapter J(DHHS). parts: Primary and secondary interlock switches,
interlock monitor switch.
2. Microwave emission check should be performed to
prior to servicing if the oven is operative. 12. If the fuse is blown by the Interlock Monitor Switch:
Replace all of the following at the same time: Pri-
3. If the oven operates with the door open : mary, door sensing switch and power relay, as well
Instruct the user not to operate the oven and con- as the Interlock Monitor Switch. The correct adjust-
tact the manufacturer and the center for devices ment of these switches is described elsewhere in
and radiological health immediately. this manual. Make sure that the fuse has the cor-
rect rating for the particular model being repaired.
4. Notify the Central Service Center if the microwave
leakage exceeds 5 mW/cm2. 13. Design Alteration Warning:
Use exact replacement parts only, i.e., only those
5. Check all grounds. that are specified in the drawings and parts lists
of this manual. This is especially important for the
6. Do not power the MWO from a "2-prong" AC cord. Interlock switches, described above. Never alter
Be sure that all of the built-in protective devices are or add to the mechanical or electrical design of the
replaced. Restore any missing protective shields. MWO. Any design changes or additions will void
the manufacturer's warranty. Always unplug the
7. When reinstalling the chassis and its assemblies, unit's AC power cord from the AC power source
be sure to restore all protective devices, including: before attempting to remove or reinstall any com-
nonmetallic control knobs and compartment covers. ponent or assembly.
8. Make sure that there are no cabinet openings 14. Never defeat any of the B+ voltage interlocks.
through which people --particularly children --might Do not apply AC power to the unit (or any of its
insert objects and contact dangerous voltages. assemblies) unless all solid-state heat sinks are
Examples: Lamp hole, ventilation slots. correctly installed.
9. Inform the manufacturer of any oven found to have 15. Some semiconductor ("solid state") devices are
emission in excess of 5 mW/cm2, Make repairs to easily damaged by static electricity. Such compo-
bring the unit into compliance at no cost to owner nents are called Electrostatically Sensitive Devices
and try to determine cause. Instruct owner not to (ESDs). Examples include integrated circuits and
use oven until it has been brought into compliance. field -effect transistors. Immediately before han-
dling any semiconductor components or assem-
CENTRAL SERVICE CENTER blies, drain the electrostatic charge from your body
by touching a known earth ground.
10. Service technicians should remove their watches
while repairing an MWO. 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.
-1-
1-2 Special Servicing Precautions (Continued)
17. When checking the continuity of the witches or NOTE : Connect the oven to a 20A. When connect-
transformer, always make sure that the power is ing the oven to a 15A, make sure that circuit
OFF, and one of the lead wires is disconnected. breaker can operate.
18. Components that are critical for safety are indi-
cated 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 charac-
teristics as the original might create shock, fire or
other hazards.
1-3 Special High Voltage Precautions
1. High Voltage Warning
Do not attempt to measure any of the high volt- H. V. Capacitor
ages --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 nega-
tive terminal of the high-voltage capacitor to to the
oven chassis. (Use a screwdriver.)
Short
3. High voltage is maintained within specified limits
by close-tolerance, safety-related components H. V. Diode
and adjustments. If the high voltage exceeds the
specified limits, check each of the special compo-
nents.
Touch chassis ground first then short to the high voltage
capacitor terminal by using screwdriver or jumper wire.
Fig. 1-1 Discharging High Voltage Capacitor
PRECAUTION PRECAUTION
There exists HIGH VOLTAGE ELECTRICITY with Never touch any circuit wiring with your hand nor
high current capabilities in the circuits of the HIGH with uninsulated tool during operation.
VOLTAGE TRANSFORMER secondary and fila-
ment terminals. It is extremely dangerous to work
on or near these circuits with the oven energized. PRECAUTION
DO NOT measure the voltage in the high voltage Servicemen should remove their watches when-
circuit including filament voltage of magnetron. ever working close to or replacing the magnetron.
-2-
2. Product Specifications & Comparison Charts
2-1 Table of Specifications
NEW MODEL BASIC MODEL
Items
(MW87W) (GE87W)
Capacity 0.8 cu.ft. (23 Liter) 0.8 cu.ft. (23 Liter)
Cavity Dimension
W330 X H211 X D329 W330 X H211 X D329
(W X H X D)
Outside Dimension
W489 X H275 X D401.5 W489 X H275 X D406.5
(W X H X D)
M/W Distribution Turntable Turntable
Door Open Mehtod Handle Handle
Oven Tray Glass, 288mm Glass, 288mm
Function
Oven Material Enamel Enamel
Cavity Structure 4 Pieces 4 Pieces
Control Mehtod Tact Tact
Power Level 6 Level 6 Level
Weight(Net) 13.5kg 13.5kg
Weight(Gross) 15kg 16.5kg
Loading Q'ty(40ft) 737(Sets / 40ft) 737(Sets / 40ft)
Input Voltage 230V 230V
Input Hertz 50Hz 50Hz
Input Power 1250 1300
High frequency Level 850W 850W
Cooking Time 99' 99'
General
high frequency Feedingt Side Side
Auto Reheat 4 4
Auto Defrost 4 4
Auto Crusty Cook 4 4
Aqua Clean No Yes
-3-
3. Operating Instructions
3-1 Control Panel
1
7
2
3 8
4 9
5
10
6 11
-4-
3-2 Features & External Views
DOOR LATCHES
VENTILATION HOLES LIGHT
HANDLE
TURNTABLE ROLLER RING
DOOR SAFETY INTERLOCK HOLES
COUPLER
275mm
342mm 206mm
489mm 401.5mm
-5-
3. Operating Instructions
3-3 Accessory
Depending on the model that you have purchased, you are supplied with several accessories that can be used
in a variety of ways.
Description Code No. Q'ty
Coupler DE68-00140A 1
Roller ring DE97-00193B 1
Turntable DE74-20102E 1
-6-
4. Disassembly and Reassembly
4-1 Replacement of Magnetron, Motor Assembly and Lamp
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 a screw securing air cover.
3. Remove the air cover.
4. Remove screws securing the magnetron to the wave guide.
5. Take out the magnetron very carefully.
6. Remove nuts from the back panel.
7. Take out the fan motor.
8. Remove the oven lamp by rotating to pull out from hole of air cover.
NOTE 1: When removing the magnetron, make sure that its antenna does not hit any adjacent parts, or it
may be damaged.
NOTE 2: When replacing the magnetron, be sure to remount the magnetron gasket in the correct position
and make sure the gasket is in good condition.
4-2 Replacement of High Voltage Transformer
1. Discharge the high voltage capacitor.
2. Disconnect all the leads. PRECAUTION
3. Remove the mounting bolts.
Servicemen should remove their watches when-
4. Reconnect the leads correctly and firmly.
ever 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.
-7-
4-3 Replacement of Door Assembly
4-3-1 Removal of Door "C"
Insert flat screwdriver into the gap between Door
"A" and Door "C" to remove Door "C". Be careful
Door "A"
when handling Door "C" because it is fragile.
Then remove the door assembly.
Door "C"
4-3-2 Removal of Door "E" Door "E"
Following the procedure as shown in the figure,
insert and bend a thin metal plate between Door
"E" and Door "A" until you hear the `tick' sound.
- Insertion depth of the thin metal plate should be
0.5mm or less.
4-3-3 Removal of Key Door & Spring
Remove pin hinge from Door "E"
Detach spring from Door "E" and key door
Spring
-8-
4-3-4 Reassembly Test
After replacement of the defective component parts of the door, reassemble it and follow the instructions
below for proper installation and adjustment so as to prevent an excessive microwave leakage.
1. When mounting the door to the oven, be sure to adjust the door parallel to the bottom line of the oven face
plate by moving the upper hinge and lower hinge in the direction necessary for proper alignment.
2. Adjust so that the door has no play between the inner door surface and oven front surface. If the door assem-
bly is not mounted properly, microwave energy may leak from the space between the door and oven.
3. Do the microwave leakage test.
4-4 Replacement of Fuse
1. Disconnect the oven from the power source.
2. When 12A fuse blows out by the operation of interlock monitor switch failure, replace the primary interlock
switch, door sensing switch, monitor switch and power relay.
3. When the above three switches operate properly, check if any other part such as the control circuit board,
blower motor or high voltage transformer is defective.
4-5 Replacement of Drive Motor
1. Take out the glass tray, guide roller from oven cavity,
disconnect power.
2. Remove turn table motor cover from case bottom.
CAUTION : Remove sharp edge after cover removal.
3. Disconnect leads from motor.
4. Remove the screws securing motor to bottom of over
cavity and lift out the motor.
5. When replacing the motor, be sure to remount it in
the correct position. Drive Motor
NOTE : The shaft of motor should fit tip coupler.
6. Screw the motor to bottom of oven cavity. Drive Motor Cover Base Plate
7. Connect leads to the drive motor.
8. Screw the drive motor cover to the base plate with a
screw driver.
NOTE : Bring the spare screw from service center.
COVER FIXING SCREW :
MACHINE SCREW(6006-001170)
-9-
4-6 Replacement of Control Circuit Board
4-6-1 Removal of Control Box
1. Be sure to ground any static electric charge in your
body and never touch the control circuit.
2. Disconnect the connectors from the control circuit
board.
3. Remove screws securing the control box assembly.
SCREW
4. Remove the screw securing the ground tail of the
keyboard.
CONTROL-BOX
4-6-2 Removal of Ass'y P.C.B
ASSY CONTROL-BOX
1. Remove screws securing the control circuit board.
2. Lift up the control circuit board from the Ass'y con- TAP
trol box. ASSY PCB
SCREWS
KEY MODULE
PCB
4-6-3 Removal of Key Module
FILM-LAMP
1. First, Remove the Assy PCB.
Next, removing the Cover panel tap (6 pieces) in CONTROL PANEL
the Assy Control Box, and then remove the Cover
Panel and Film Lamp.
2. Remove Start button and Dial knob in the Key START-BUTTON
Module PCB.
COVER-PANEL DIAL KNOB
3. Remove screw (1 piece) under a key Module PCB.
KEY MODULE
4. Lift out key Module PCB to the underside from the FILM-BOARD
PCB
control panel.
5. Remove Film-board from key Module PCB.
KEY MODULE
PCB
SCREWS
- 10 -
5. Alignment and Adjustments
PRECAUTION
1. High voltage is present at the high voltage terminals during any cook cycle.
2. It is neither necessary nor advisable to attempt measurement of the high voltage.
3. Before touching any oven components or wiring, always unplug the oven from its power source and
discharge the high voltage capacitor.
5-1 High Voltage Transformer
1. Remove connectors from the transformer terminals
Filament Terminals
and check continuity.
2. Normal resistance readings are as follows:
Secondary
Secondary Approx. 171 Terminal
Filament Approx. 0
Primary Approx. 2.3
Primary
(Room temperature = 20