Model No : -Product Code No : EM-S8000BS437 500 00
EM-S8000WS437 500 01
CAUTIONCAUTION
CAUTION
CAUTIONCAUTION
WW
ARNING TO SERARNING TO SER
W
ARNING TO SER
WW
ARNING TO SERARNING TO SER
VICE TECHNICIANSVICE TECHNICIANS
VICE TECHNICIANS
VICE TECHNICIANSVICE TECHNICIANS
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 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 per formance standard should be performed
on each oven prior to release to the owner.
REFERENCE NO. SM-860278
CAUTIONCAUTION
CAUTION
CAUTIONCAUTION
For micrFor micr
For micr
For micrFor micr
owave enerowave ener
owave ener
owave enerowave ener
gy emissiongy emission
gy emission
gy emissiongy emission
In the area emitting the highest reading, switch the meter
to SLOW RESPONSE, and take a reading for minimum of
three (3) seconds. We recommended the pattern outline
shown below when the door surface is surveyed.
On every service calls, check for microwave energy
emission, must be made according to the following manner.
MeasurMeasur
Measur
MeasurMeasur
Measurement must be made with the microwave oven
operating at its maximum output and containing a load of
275±15 milliliters of tap water initially at 20
±9oF) placed within the cavity at the center.
NOTENOTE
NOTE : The water container must be a 600 milliliter beaker
NOTENOTE
A properly operating door and seal assembly will normally
register emission on greater than 4mW/cm
measurement uncertainty with the cooking shelf or tray in
place.
All repairs must be performed in such a manner All repairs must be performed in such a manner
All repairs must be performed in such a manner
All repairs must be performed in such a manner All repairs must be performed in such a manner
micrmicr
micr
micrmicr
Follow the instructions supplied with a detector being used
and performed an R.F. emission test around the door front
and edges and all edges and vent of the outer case. The
cabinet (wrapper) must be in place and the oven fully
assembled.
When performing emission survey, with the meter on FAST
RESPONSE the movement of a detector probe shall not
exceed one (1) inch per second.
ement of enerement of ener
ement of ener
ement of enerement of ener
and made of an electrically none conductive
material such as glass or plastic.
The cook tray must be in place when measuring
emission.
owave enerowave ener
owave ener
owave enerowave ener
gy emissiongy emission
gy emission
gy emissiongy emission
gy emission argy emission ar
gy emission ar
gy emission argy emission ar
e minimal.e minimal.
e minimal.
e minimal.e minimal.
o±5o
2
celsius (68
to allow for
thatthat
that
thatthat
NOTENOTE
NOTE : Periodically check to be sure that the probe tip is
NOTENOTE
not worn or dirty.
The following U.S. standard applies to microwave ovens :
21 CFR 1030.10, Performance Standard for Microwave
Ovens.
It requires that the power density of the microwave
radiation emitted by a microwave oven shall not exceed
five (5) milliwatts per square centimeter at any point 5
centimeter (about 2 inches) or more from the external
surface of the oven.
All microwave ovens exceeding the emission level of
4mW/cm
microwave ovens and the manufacturer immediately and
the owner should be told not to use the microwave oven
until it has been repaired completely.
If a microwave oven is found to operate with the door open,
report to Dept. of Service, the manufacturer and CDRH*
immediately. Also tell the owner not to use the oven.
*CDRH : Center for Device and Radiological Health.
The interlock monitor switch acts as the final safety switch
protecting the customer from microwave radiation. If the
interlock monitor switch operates properly and the door
interlocks switch fails, the fuse will blow. If this happens,
all interlock switches must be replaced. The contacts of
the interlock switches may be welded together.
NOTE : If the interlock monitor circuit operates and at the
NOTENOTE
same time the fuse blows with the door opened,
be sure to replace the control circuit board because
relay 2 on the control circuit board, the door sensing
switch and the electric circuit related on the
door sensing switch, which act as Secondary
Interlock Switch.
Door
Latch
Lever Stopper
Door
Sensing
Switch
(1) Loosen 2 screws securing the lever stopper.
(2) Adjust the lever stopper position so that it is pushed
forward and pull backward until there is about zero
gap between the latch lever and the switch body on
the primary interlock switch and at the same time
there is about zero gap between the door latch and
the switch body on the door sensing switch when
the door latch is securely locked.
(3) Tighten the lever stopper screws securely.
(4) Make sure the interlock monitor switch closes after
the primary interlock switch opens when the door
is opened very slowly, according to “CHECKOUT
PROCEDURE FOR SWITCHES” on page 6.
(5) Make sure the interlock monitor switch opens before
the primary interlock switch closes when the door is
closed very slowly, according to “CHECKOUT
PROCEDURE FOR SWITCHES” on page 6.
(6) Make sure the microwave energy leakage should be
no greater than 4mW/cm2 to allow for measurement
uncertainty when measured with a detector.
(All service adjustments must be made for
minimum microwave energy leakage readings.)
Interlock
Monitor
Switch
Screws
- 1 -
Figure 1Figure 1
Figure 1
Figure 1Figure 1
Latch
Lever
Primary
Interlock
Switch
2. SPECIFICA2. SPECIFICA
2. SPECIFICA
2. SPECIFICA2. SPECIFICA
Rated Power Consumption . .. 1650W.
Microwave Output ................. 1100W.
Frequency .............................. 2,450MHz±50MHz.
Power Supply ......................... 120V±12V, 60Hz.
Rated Current ........................ 14.0 Amp.
Safety Devices ...................... Thermal Fuse open at 332°F
Timer ...................................... Electronic Digital, up to
Overall Dimensions ............... 297/8”(W) x 141/8”(D) x 17”(H)
Oven Cavity Size ................... 191/4”(W) x 131/2”(D) x 97/8”(H)
Net Weight ............................ Approx. 59.5 Lbs.
3. POWER OUTPUT MEASUREMENT3. POWER OUTPUT MEASUREMENT
3. POWER OUTPUT MEASUREMENT
3. POWER OUTPUT MEASUREMENT3. POWER OUTPUT MEASUREMENT
NOTENOTE
NOTE
NOTENOTE
The power output specification, 1000 W. on this model is
measured with IEC measurement. The power output is
measured with two ( 2 ) liters water is equivalent to 1000 W.
in measurement with IEC, when measured with the following
power output.
(1) Fill two beakers ( glass or plastic ) with each one liter
of tap water ( about 20oC ) and measure the water temperature. ( Use a thermometer with a 1/10 degree gauge ).
(2) Place the beakers side by side in the center of the glass
tray.
(3) Close the door, set the “TIME” for two minutes. ( “200”
in the display window. ) Touch the “START” key and
heat the water exactly for two minutes.
(4) Take the beakers out, immediately stir the water and
measure the water temperature respectively.
(5) Calculate the temperature rise of water in each beaker.
Then calculate the average value of two temperature rises.
Output power can be calculated by the equation :
Where ∆t is an average temperature rise in degrees
Centigrade.
(6) Power output shall be in the following range :
Average Temperature Rise Power Output
Minimum23.0
Maximum28.3oF(15.7oC)1099W
(7) Power Output is affected by the line voltage under load.
For correct Power Output measurement, the line voltage
under load must be 120±1volts.
TIONSTIONS
TIONS
TIONSTIONS
(167oC) for Cavity & Bottom.
Thermal Protector open at
252°F(122oC) for Magnetron.
Thermostat close at 140°F
(60°C) for Hood Fan.
Fuse (Cartridge Type 20A)
Primary Interlock Switch,
Door Sensing Switch and
Relay 2.
Interlock Monitor Switch.
99min. 99 sec.
Power Output (W) = 70 x ∆t
o
F(12.8oC) 896W
4.4.
PRECAUTIONS AND REPPRECAUTIONS AND REP
4.
PRECAUTIONS AND REP
4.4.
PRECAUTIONS AND REPPRECAUTIONS AND REP
PRELIMINARPRELIMINAR
PRELIMINAR
PRELIMINARPRELIMINAR
A.A.
SINCE NEARLSINCE NEARL
A.
SINCE NEARL
A.A.
SINCE NEARLSINCE NEARL
CUITS OF THIS MICROWCUITS OF THIS MICROW
CUITS OF THIS MICROW
CUITS OF THIS MICROWCUITS OF THIS MICROW
BE CARRIED OUT WITH GREABE CARRIED OUT WITH GREA
BE CARRIED OUT WITH GREA
BE CARRIED OUT WITH GREABE CARRIED OUT WITH GREA
B.B.
TO ATO A
B.
TO A
B.B.
TO ATO A
ENERGY LEAKAGE, THE FOLLOWING PRECAUTIONSENERGY LEAKAGE, THE FOLLOWING PRECAUTIONS
ENERGY LEAKAGE, THE FOLLOWING PRECAUTIONS
ENERGY LEAKAGE, THE FOLLOWING PRECAUTIONSENERGY LEAKAGE, THE FOLLOWING PRECAUTIONS
MUST BE TMUST BE T
MUST BE T
MUST BE TMUST BE T
(1) Before the power is applied :
(a) Open and close door several times to make sure the
primary interlock switch, the interlock monitor switch
and the door sensing switch operate properly.
(Listen for the clicking sound from the switches.)
Make sure the interlock monitor switch closes after
the primary interlock switch is opens when the door
is opened.(See pages 1 and 6)
(b) Make sure the perforated screen and the choke die-
lectric of the door are correctly mounted.
(2) After the power is applied :
(a) Open and close the door to see if the interlock mech-
anism operates properly.
(b) Check microwave energy leakage with a leakage
detector and confirm the energy leakage should be
no greater than 4mW/cm2 to allow for measurement
uncertainty.
(3) Do not operate the unit until it is completely repaired,
if any of the following conditions exists :
(a) Door does not close firmly against the cavity front.
(b) The hinge is broken.
(c) The choke dielectric or the door seal is damaged.
(d) The door is bent or warped, or there is any other
visible damage to the oven that may cause microwave
energy leakage.
NOTE : NOTE :
NOTE :
NOTE : NOTE :
(e) Make sure that there are no defective parts in the
interlock mechanism.
(f) Make sure there are no defective parts in the
microwave generating and transmission assembly.
(especially waveguide).
(4) The following items should be checked after the unit
is repaired :
(a) The interlock monitor switch is connected correctly
and firmly.
(b) The magnetron gasket on the magnetron is properly
positioned.
(c) Waveguide and oven cavity are intact (no leakage of
microwave energy).
(d) The door can be properly closed and the safety
switches work properly.
(e) The oven must be stopped when the door is opened
or the time is up.
The oven must not be operated with any of theThe oven must not be operated with any of the
The oven must not be operated with any of the
The oven must not be operated with any of theThe oven must not be operated with any of the
above components rabove components r
above components r
above components rabove components r
YY
Y
YY
Y 2,000 VOLY 2,000 VOL
Y 2,000 VOL
Y 2,000 VOLY 2,000 VOL
VOID POSSIBLE EXPOSURE TO MICROWVOID POSSIBLE EXPOSURE TO MICROW
VOID POSSIBLE EXPOSURE TO MICROW
VOID POSSIBLE EXPOSURE TO MICROWVOID POSSIBLE EXPOSURE TO MICROW
AKEN BEFORE SERAKEN BEFORE SER
AKEN BEFORE SER
AKEN BEFORE SERAKEN BEFORE SER
Always keep the seal clean.Always keep the seal clean.
Always keep the seal clean.
Always keep the seal clean.Always keep the seal clean.
emoved or bypassed.emoved or bypassed.
emoved or bypassed.
emoved or bypassed.emoved or bypassed.
AIR SERAIR SER
AIR SER
AIR SERAIR SER
TS EXISTS IN SOME CIR-TS EXISTS IN SOME CIR-
TS EXISTS IN SOME CIR-
TS EXISTS IN SOME CIR-TS EXISTS IN SOME CIR-
AA
VE OVEN, REPVE OVEN, REP
A
VE OVEN, REP
AA
VE OVEN, REPVE OVEN, REP
T CARE.T CARE.
T CARE.
T CARE.T CARE.
VICING.VICING.
VICING.
VICING.VICING.
VICE TIPSVICE TIPS
VICE TIPS
VICE TIPSVICE TIPS
AIRS SHOULDAIRS SHOULD
AIRS SHOULD
AIRS SHOULDAIRS SHOULD
AA
VEVE
A
VE
AA
VEVE
- 2 -
5. CIRCUIT DIAGRAM
KCOLRETNIYRADNOCES
YRAMIRP
•
EDAMHCTIWS
NOITIDNOC
NEPOROOD
ESOLCROOD
KCOLRETNI
HCTIWS
MOCMOCMOCMOC
ONCNONON
•••
KCOLRETNI
ROTINOM
HCTIWS
ROOD
GNISNES
HCTIWS
2YALER
•
Figure 2Figure 2
Figure 2
Figure 2Figure 2
- 3 -
6. TEST PROCEDURES AND TROUBLESHOOTING6. TEST PROCEDURES AND TROUBLESHOOTING
6. TEST PROCEDURES AND TROUBLESHOOTING
6. TEST PROCEDURES AND TROUBLESHOOTING6. TEST PROCEDURES AND TROUBLESHOOTING
CAUTIONCAUTION
CAUTION
CAUTIONCAUTION
- DISCONNECT THE POWER SUPPL- DISCONNECT THE POWER SUPPL
- DISCONNECT THE POWER SUPPL
- DISCONNECT THE POWER SUPPL- DISCONNECT THE POWER SUPPL
THE WTHE W
ALL OUTLET WHENEVER REMOVING THEALL OUTLET WHENEVER REMOVING THE
THE W
ALL OUTLET WHENEVER REMOVING THE
THE WTHE W
ALL OUTLET WHENEVER REMOVING THEALL OUTLET WHENEVER REMOVING THE
CABINET FROM THE UNITCABINET FROM THE UNIT
CABINET FROM THE UNIT
CABINET FROM THE UNITCABINET FROM THE UNIT
TESTS ONLTESTS ONL
TESTS ONL
TESTS ONLTESTS ONL
VOLVOL
TT
VOL
T
VOLVOL
TT
WIRES FROM THE PRIMARWIRES FROM THE PRIMAR
WIRES FROM THE PRIMAR
WIRES FROM THE PRIMARWIRES FROM THE PRIMAR
HIGH VOLHIGH VOL
HIGH VOL
HIGH VOLHIGH VOL
A.A.
TEST PROCEDURESTEST PROCEDURES
A.
TEST PROCEDURES
A.A.
TEST PROCEDURESTEST PROCEDURES
Y AFTER DISCHARGING THE HIGHY AFTER DISCHARGING THE HIGH
Y AFTER DISCHARGING THE HIGH
Y AFTER DISCHARGING THE HIGHY AFTER DISCHARGING THE HIGH
AGE CAPAGE CAP
AGE CAP
AGE CAPAGE CAP
ACITOR AND REMOVING THE LEADACITOR AND REMOVING THE LEAD
ACITOR AND REMOVING THE LEAD
ACITOR AND REMOVING THE LEADACITOR AND REMOVING THE LEAD
TT
AGE TRANSFORMER. (SEE FIGURE 3)AGE TRANSFORMER. (SEE FIGURE 3)
T
AGE TRANSFORMER. (SEE FIGURE 3)
TT
AGE TRANSFORMER. (SEE FIGURE 3)AGE TRANSFORMER. (SEE FIGURE 3)
Y CORD FROMY CORD FROM
Y CORD FROM
Y CORD FROMY CORD FROM
, PROCEED WITH THE, PROCEED WITH THE
, PROCEED WITH THE
, PROCEED WITH THE, PROCEED WITH THE
Y WINDING OF THEY WINDING OF THE
Y WINDING OF THE
Y WINDING OF THEY WINDING OF THE
Secondary
Windings
Filament Windings
Primary
Windings
Figure 3Figure 3
Figure 3
Figure 3Figure 3
COMPONENT COMPONENT
COMPONENT
COMPONENT COMPONENT
MAGNETRON
CHECKOUT PROCEDURE CHECKOUT PROCEDURE
CHECKOUT PROCEDURE
CHECKOUT PROCEDURE CHECKOUT PROCEDURE
1) Check for resistance : Across the filamentNormal reading :
terminals of the magnetron with an ohm-meterLess than 1 ohm.
on R x 1 scale.
Ohm-meterOhm-meter
Ohm-meter
Ohm-meterOhm-meter
Figure 4Figure 4
Figure 4
Figure 4Figure 4
2) Check for resistance : Between each filamentNormal reading :
terminal of the magnetron and the chassisInfinite ohms.
ground with an ohm-meter on highest scale.
Ohm-meterOhm-meter
Ohm-meter
Ohm-meterOhm-meter
Figure 5Figure 5
Figure 5
Figure 5Figure 5
1) Measure the resistance :Normal readings :
With an ohm-meter on R x 1 scale.
a.Primary winding :Approximately 0.337 ohms.
b.Filament winding :Less than 1 ohm.
c.Secondary winding :Approximately 66.86 ohms.
RESUL RESUL
RESUL
RESUL RESUL
TT
T
TT
HIGH-VOLTAGE
TRANSFORMER
2) Measure the resistance :Normal readings :
With an ohm-meter on highest scale.
a.Primary winding to ground.Infinite ohms.
bFilament winding to ground.Infinite ohms.
Ohm-meterOhm-meter
Ohm-meter
Ohm-meterOhm-meter
Figure 6Figure 6
Figure 6
Figure 6Figure 6
Note : Remove varnish of
measured point.
- 4 -
COMPONENT COMPONENT
COMPONENT
COMPONENT COMPONENT
HIGH-VOLTAGE
CAPACITOR
including
BLEEDER
RESISTOR
CHECKOUT PROCEDURE CHECKOUT PROCEDURE
CHECKOUT PROCEDURE
CHECKOUT PROCEDURE CHECKOUT PROCEDURE
Measure the resistance : Across two terminalsNormal reading :
with an ohm-meter on highest scale.Momentarily indicates several ohms,
Abnormal reading :
Ohm-meterOhm-meter
Ohm-meter
Ohm-meterOhm-meter
Figure 7Figure 7
Figure 7
Figure 7Figure 7
Measure the resistance : Across two terminalsNormal reading :
with an ohm-meter on R x 10,000 scale.Indicates about the middle position in
Ohm-meterOhm-meter
Ohm-meter
Ohm-meterOhm-meter
RESUL RESUL
RESUL
RESUL RESUL
and gradually returns to 10 meg-ohms.
Indicates continuity or 10 meg-ohms
from the beginning.
one direction (forward direction) and
infinite ohms in the reverse direction,
using meter which is provided with a
9 volt battery.
TT
T
TT
HIGH-VOLTAGE
DIODE
CONTROL
CIRCUIT
BOARD
Figure 8Figure 8
Figure 8
Figure 8Figure 8
Measure the voltage : Between test point TP-1,
TP-2, TP-3, TP-4 or TP-5 and Ground between
TP-6 and TP-7 (See Control Circuit Board on
page 19).
- Proceed with the check of the Step-Down
Transformer, to see if any one of the measured
values is different from the specified values.
NOTENOTE
NOTE
NOTENOTE
NOTENOTE
NOTE
NOTENOTE
- Some digital meter may show over
even in a forward direction because
low measuring voltage of meter does
not allow the meter current to pass
through the high voltage diode.
Abnormal reading :
Indicates continuity or infinite ohms
in both directions.
Test
Point
Voltage
Test
Point
Voltage
TP-1TP-2TP-3
-5V-15V-25V
DC DC DC
TP-4TP-5
-27V-31V2.0V
DC DC AC
TP-6/
TP-7
- 5 -
COMPONENT COMPONENT
COMPONENT
COMPONENT COMPONENT
CHECKOUT PROCEDURE CHECKOUT PROCEDURE
CHECKOUT PROCEDURE
CHECKOUT PROCEDURE CHECKOUT PROCEDURE
RESUL RESUL
RESUL
RESUL RESUL
TT
T
TT
WhenWhen not
touchedtouched
Less thanMore than
1K Ohms1 MEG Ohms
TOUCH KEY
Measure the resistance between terminals of
FPC connector after removing it from S101.
(Figure 9).
NOTE NOTE
NOTE
NOTE NOTE
Resistance
value
BOARD- When reconnecting the FPC connector, makeWhen checking “START” key, connect
sure the holes on the connector are properlyohm-meter as illustration below.
inserted in hooks of the plastic fastener in S101.