Sanyo EMS8000BS, EMS8000BSSM860278 Schematic

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File No :
File No :File No :
SER SER
SER
SER SER
VICE MANUALVICE MANUAL
VICE MANUAL
VICE MANUALVICE MANUAL
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owave Ovenowave Oven
owave Oven
owave Ovenowave Oven
EM-S8000BSEM-S8000BS
EM-S8000BS
EM-S8000BSEM-S8000BS EM-S8000WS (U.S.A.)EM-S8000WS (U.S.A.)
EM-S8000WS (U.S.A.)
EM-S8000WS (U.S.A.)EM-S8000WS (U.S.A.)
Model No : - Product Code No : ­EM-S8000BS 437 500 00 EM-S8000WS 437 500 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
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
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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
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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
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and made of an electrically none conductive material such as glass or plastic. The cook tray must be in place when measuring emission.
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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.
2
must be reported to Dept. of Service for
- i -
- TABLE OF CONTENTS -
Adjustment Procedures ................................................... 1
Specifications .................................................................. 2
Power Output Measurement ........................................... 2
Precautions and Repair Service Tips .............................. 2
Circuit Diagram ............................................................... 3
1.1.
ADJUSTMENT PROCEDURESADJUSTMENT PROCEDURES
1.
ADJUSTMENT PROCEDURES
1.1.
ADJUSTMENT PROCEDURESADJUSTMENT PROCEDURES
TT
O AO A
VOID POSSIBLE EXPOSURE TO MICROWVOID POSSIBLE EXPOSURE TO MICROW
T
O A
VOID POSSIBLE EXPOSURE TO MICROW
TT
O AO A
VOID POSSIBLE EXPOSURE TO MICROWVOID POSSIBLE EXPOSURE TO MICROW
ENERGY LEAKAGE, THE FOLLOWINGENERGY LEAKAGE, THE FOLLOWING
ENERGY LEAKAGE, THE FOLLOWING
ENERGY LEAKAGE, THE FOLLOWINGENERGY LEAKAGE, THE FOLLOWING ADJUSTMENT OF THE INTERLOCK SWITCHESADJUSTMENT OF THE INTERLOCK SWITCHES
ADJUSTMENT OF THE INTERLOCK SWITCHES
ADJUSTMENT OF THE INTERLOCK SWITCHESADJUSTMENT OF THE INTERLOCK SWITCHES SHOULD BE MADE ONLSHOULD BE MADE ONL
SHOULD BE MADE ONL
SHOULD BE MADE ONLSHOULD BE MADE ONL SERSER
VICE PERSONNEL.VICE PERSONNEL.
SER
VICE PERSONNEL.
SERSER
VICE PERSONNEL.VICE PERSONNEL.
The SANYO service center should have the designated detector to measure the microwave energy leakage after the repair or adjustment.
NOTENOTE
NOTE : Detector to be used at the service center is
NOTENOTE
NARDA 8100, 8200 or the equivalent.
PRIMARPRIMAR
PRIMAR
PRIMARPRIMAR MONITOR SWITCH AND DOOR SENSING SWITCHMONITOR SWITCH AND DOOR SENSING SWITCH
MONITOR SWITCH AND DOOR SENSING SWITCH
MONITOR SWITCH AND DOOR SENSING SWITCHMONITOR SWITCH AND DOOR SENSING SWITCH ADJUSTMENTADJUSTMENT
ADJUSTMENT
ADJUSTMENTADJUSTMENT (Figure 1)(Figure 1)
(Figure 1)
(Figure 1)(Figure 1)
Y INTERLOCK SWITCH, INTERLOCKY INTERLOCK SWITCH, INTERLOCK
Y INTERLOCK SWITCH, INTERLOCK
Y INTERLOCK SWITCH, INTERLOCKY INTERLOCK SWITCH, INTERLOCK
Y BY AUTHORIZEDY BY AUTHORIZED
Y BY AUTHORIZED
Y BY AUTHORIZEDY BY AUTHORIZED
AA
VEVE
A
VE
AA
VEVE
Test Procedures and Troubleshooting .................... 4 ~ 10
Disassembly Instructions ....................................... 11 ~ 14
Exploded View and Parts List ................................ 15 ~ 20
Overall Circuit Diagram .......................................... 21
NOTENOTE
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)
Turn Table Diameter ............... 1013/16”
Effective Capacity of
Oven Cavity ........................... 1.5 Cubic Feet.
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 Minimum 23.0 Maximum 28.3oF(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 filament Normal reading : terminals of the magnetron with an ohm-meter Less 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 filament Normal reading : terminal of the magnetron and the chassis Infinite 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. b Filament 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 terminals Normal 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 terminals Normal 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-1 TP-2 TP-3
-5V -15V -25V DC DC DC
TP-4 TP-5
-27V -31V 2.0V DC DC AC
TP-6/ TP-7
- 5 -
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