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R- 370EK
R - 37 0ES

MAGNETRON REMOVAL

Removal
1. Disconnect the power supply cord and then remove

outer case.

2. Remove the oven cavity assembly from the base plate.

Refer to "OVEN CAVITY ASSEMBLY REMOVAL".

3. Discharge the high voltage capacitor.
4. Now, the wire leads should be disconnected from the

magnetron and thermal cut-out (MG).

5. Carefully remove the four (4) screws holding magnetron

to waveguide flange.

6. Remove magnetron with care so that magnetron antenna

is not hit by any metal object around antenna.

7. Remove the one (1) screw holding the magnetron duct

assembly to the magnetron.

8. Remove the magnetron duct assembly with thermal cut-

out (MG) from magnetron.

9. Now, the magnetron is free.

Reinstallation
1. Re-install the magnetron thermal duct assembly with

thermal cut-out (MG) to magnetron with the one (1)
screw.

2. Re-install the magnetron to waveguide flange with the

four (4) screws.

3. Re-install the oven cavity assembly to the base plate.

Refer to "OVEN CAVITY ASSEMBLY REMOVAL".

4. Reconnect the wire leads to the magnetron and thermal

cut-out (MG). Refer to "PICTORIAL DIAGRAM" on page
32.

5. Re-install outer case and check that the oven is operating

properly.

CAUTION: WHEN REPLACING MAGNETRON, BE SURE

THE R.F. GASKET IS IN PLACE AND MOUNT-
ING SCREWS ARE TIGHTENED SECURELY.

OVEN LAMP REMOVAL

1. Disconnect the power supply cord and remove outer

case.

2. Open the door and block it open.
3. To discharge the high voltage capacitor, wait for 60

seconds.

transformer from the high voltage capacitor.

6. Remove one (1) screw holding capacitor holder to base

plate.

7. Remove one (1) screw holding high voltage rectifier

assembly to capacitor holder.

8. Disconnect rectifier terminal from the capacitor.

High voltage rectifier assembly is now free.

9. Remove the capacitor holder. The capacitor is now free.

CAUTION: WHEN REPLACING HIGH VOLTAGE RECTI-

FIER AND HIGH VOLTAGE CAPACITOR,
GROUND SIDE TERMINAL OF THE HIGH
VOLTAGE RECTIFIER MUST BE SECURED
FIRMLY WITH A GROUNDING SCREW.

4. Disconnect the wire leads from the oven lamp.
5. Remove the one (1) screw holding the oven lamp to the

lamp angle.

6. Remove the oven lamp from the lamp angle.
7. Now, the oven lamp socket is free.

REMOVAL
1. Disconnect the power supply cord and then remove the

outer case.

2. Remove the oven cavity assembly from the base plate.

Refer to "OVEN CAVITY ASSEMBLY REMOVAL".

3. Discharge the high voltage capacitor.
4. Disconnect the wire leads from the fan motor.
5. Release the main wire harness and the switch harness

from the holes of the fan duct.

6. Remove each one (1) screw holding the separate

angles A, B and C to the base plate. And remove them
from base plate.

7. Remove two (2) screws holding the fan duct to the base

plate. And remove it from the base plate.

8. Remove the fan blade from the fan motor shaft according

to the following procedure.

9. Hold the edge of the rotor of the fan motor by using a pair

of groove joint pliers.

CAUTION:
*

Make sure that no metal pieces enter the gap between
the rotor and the stator of the fan motor because the
rotor is easily shaven by pliers and metal pieces may
be produced.

FAN MOTOR REMOVAL

Do not touch the pliers to the coil of the fan motor
because the coil may be cut or injured.

Do not disfigure the bracket by touching with the
pliers.

10.Remove the fan blade from the shaft of the fan motor by

pulling and rotating the fan blade with your hand.

11. Now, the fan blade will be free.
CAUTION:
*

Do not reuse the removed fan blade because the
hole (for shaft) may be larger than normal.

12.Remove the two (2) screws holding the fan motor to the

fan duct.

13.Now, the fan motor is free.
14.Another fan motor can be removed in a same way.

INSTALLATION
1. Install the fan motor to the fan duct with the two (2)

screws.

2. Install the fan blade to the fan motor shaft according to

the following procedure.

3. Hold the center of the bracket which supports the shaft

of the fan motor on the flat table.

4. Apply the screw lock tight into the hole (for shaft) of the

Содержание R-370EK

Страница 1: ...T COVER WARNING TO SERVICE PERSONNEL 1 MICROWAVE MEASUREMENT PROCEDURE 2 FOREWORD AND WARNING 3 PRODUCT SPECIFICATIONS 4 GENERAL INFORMATION 4 OPERATION 6 TROUBLESHOOTING GUIDE 10 TEST PROCEDURE 12 TOUCH CONTROL PANEL 21 COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE 26 PICTORIAL DIAGRAM 33 POWER UNIT CIRCUIT 34 CPU UNIT CIRCUIT 35 PRINTED WIRING BOARD 36 PARTS LIST 37 PACKING AND ACCESSORIES 39 S...

Страница 2: ...tion 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 BEFORE SERVICING Before servicing an operative unit perform a microwave emission check as per the Mic...

Страница 3: ...capacitor 4 Disconnect the leads to the primary of the power transformer 5 Ensure that the leads remain isolated from other components and oven chassis by using insulation tape 6 After that procedure reconnect the power supply cord When the testing is completed 1 Disconnect the power supply cord and then remove outer case 2 Open the door and block it open 3 Discharge high voltage capacitor 4 Recon...

Страница 4: ...ter initially at 20 5 C 68 F in the center of the oven cavity The water container shall be a low form of 600 ml 20 oz beaker with an inside diameter of approx 8 5 cm 3 1 2 in and made of an electrically nonconductive material such as glass or plastic The placing of this standard load in the oven is important not only to protect the oven but also to insure that any leakage is measured accurately 4 ...

Страница 5: ...ing is not damaged D The door is not deformed or warped E There is no other visible damage with the oven Servicing and repair work must be carried out only by trained service personnel DANGER Certaininitialpartsareintentionallynotgroundedandpresent a risk of electrical shock only during servicing Service personnel Do not contact the following parts while the appliance is energized HighVoltageCapac...

Страница 6: ...CK pad STOP CLEAR pad MINUTE PLUS START pad Oven Cavity Light Yes Safety Standard UL Listed FCC Authorized DHHS Rules CFR Title 21 Chapter 1 Subchapter J SPECIFICATION GENERAL INFORMATION GROUNDING INSTRUCTIONS This oven is equipped with a three prong grounding plug It must be plugged into a wall receptacle that is properly installed and grounded in accordance with the National Electrical Code and...

Страница 7: ...inges 7 Door seals and sealing surface 8 Turntable motor shaft 9 Removable turntable support Carefullyplacetheturntablesupportinthecenter of the oven floor 10 Removable turntable Place the turntable on the turntable support cecurely The turntable will rotate clockwise or counterclockwise Only remove for cleaning 11 Ventilation openings Rear 12 Oven light It will light when oven is operating or doo...

Страница 8: ...itor switch electrically monitors the operation of the primary interlock switch and secondary interlock relay RY2 andismechanicallyassociatedwiththedoor so that it will function in the following sequence 1 When the door opens from the closed position the secondary interlock relay RY2 and primary interlock switch open their contacts And contacts of the relay RY1 remains closed Then the monitor swit...

Страница 9: ...ing on SENSOR 2 Thecoilofshut offrelay RY 1 isenergized theturntable motor oven lamp and cooling fan motors are turned on but the power transformer is not turned on 3 After about 16 seconds the cook relay RY 2 is energized The power transformer is turned on microwave energy is produced and first stage is started The 16 seconds is the cooling time required to remove any vapor from the oven cavity a...

Страница 10: ...TOR 0 94µF AC 2200V F1 F3 F2 NOTE indicates components with potential above 250V SCHEMATIC NOTE CONDITION OF OVEN 1 DOOR CLOSED 2 COOKING TIME PROGRAMMED 3 VARIABLE COOKING CONTROL P HI 100 4 START PAD TOUCHED Figure O 2 Oven Schematic Cooking Condition 120V AC 60 Hz OVEN LAMP OVEN LAMP RELAY TURN TABLE MOTOR FAN MOTOR POWER TRANSFORMER MONITOR SWITCH RECTIFIER MAGNETRON PRIMARY INTERLOCK SWITCH T...

Страница 11: ... INTERLOCK RELAY RY2 RELAY RY1 PRIMARY INTERLOCK SWITCH AND MONITOR SWITCH FOR PROPER OPERATION REFER TO CHAP TER TEST PROCEDURE NOTE MONITOR FUSE AND MONITOR SWITCH ARE REPLACED AS AN ASSEMBLY TURNTABLE MOTOR The turntable motor rotates the turntable located on the bottom of the oven cavity so that the foods on the turntable cook evenly during cooking The turntable may turn in either direction CO...

Страница 12: ...S BA023WRK0 as an assembly IMPORTANT Whenever troubleshooting is performed with the power supply cord disconnected It may in some cases be necessary to connect the power supply cord after the outer case has been removed in this event 1 Disconnect the power supply cord and then remove outer case 2 Open the door and block it open 3 Discharge high voltage capacitor 4 Disconnect the leads to the prima...

Страница 13: ... ex tremely uneven heating is produced in oven load food Oven does not cook properly when programmedforCookingPowerP 50 mode Operates properly on Cook ing Power HIGH 100 mode Oven goes into COMPU DEFROST but food is not defrosted well AH sensor does not end during sen sor cooking condition Oven does not shut off after a cup of water is boiling by sensor cooking Oven stops at 16 sec after starting ...

Страница 14: ...URING THE COOK CYCLE SO EXTREME CAUTION SHOULD BE OBSERVED Power output of the magnetron can be measured by performing a water temperature rise test This test shouldonlybeusedifabovetestsdonotindicateafaultymagnetronandthereisnodefectinthefollowing componentsorwiring siliconrectifier highvoltagecapacitorandpowertransformer Thistestwillrequire a 16 ounce 453cc measuring cup and an accurate mercury ...

Страница 15: ...air flow through the vent holes of the oven cavity especially the cooling fan and air guide 5 Reconnect all leads removed from components during testing 6 Reinstall the outer case cabinet 7 Reconnect the power supply cord after the outer case is installed 8 Run the oven and check all functions MAGNETRON THERMAL CUT OUT TEST 1 Disconnect the power supply cord and then remove outer case 2 Open the d...

Страница 16: ...nect the power supply cord after the outer case is installed 8 Run the oven and check all functions SECONDARY INTERLOCK SYSTEM TEST DOOR SENSING SWITCH 1 Disconnect the power supply cord and then remove outer case 2 Open the door and block it open 3 To discharge the high voltage capacitor wait for 60 seconds 4 Isolatetheswitchandconnecttheohmmetertothecommon COM andnormallyopen NO terminal of the ...

Страница 17: ... with only a voltmeter and ohmmeter In this service manual the control panel unit is divided into three units CPU Unit Key Unit and Power Unit and troubleshooting by unit replacement is described according to the symptoms indicated Before testing 1 Disconnect the power supply cord and then remove outer case 2 Open the door and block it open 3 To discharge high voltage capacitor wait for 60 seconds...

Страница 18: ...r supply cord and then remove outer case 2 To discharge the high voltage capacitor wait for 60 seconds 3 If the display fails to clear when the STOP CLEAR pad is depressed first verify the flat ribbon cable is making good contact verify that the door sensing switch stop switch operates properly that is the contacts are closed when the door is closed and open when the door is open If the door sensi...

Страница 19: ...ter The meter should indicate 120 volts if not check oven circuit RY1 and RY2 Relay Test These relays are operated by D C voltage Check voltage at the relay coil with a D C voltmeter during the microwave cooking operation DC voltage indicated Defective relay DC voltage not indicated Check diode which is connected to the relay coil If diode is good control unit is defective RELAY SYMBOL OPERATIONAL...

Страница 20: ... repair STEPS OCCURRENCE CAUSE OR CORRECTION The rated AC voltage is not present between 1 the normal open terminal of the relay RY1 and Check supply voltage and oven power cord the normal open terminal of the relay RY2 2 The rated AC voltage is present at primary Low voltage transformer or secondary circuit defective side of low voltage transformer Check and repair 8 Disconnect the power supply c...

Страница 21: ... AH sensor or check the control unit refer to explanation below If the oven stops after 5 minutes and ERROR is displayed the AH sensor is normal Check other parts except the AH sensor TESTING METHOD FOR AH SENSOR AND OR CONTROL UNIT To determine if the sensor is defective the simplest method is to replace it with a new replacement sensor 1 Disconnect the power supply cord and then remove outer cas...

Страница 22: ...f the above is proper the AH sensor is probably defective 10 Disconnect the power supply cord and then remove outer case 11 Open the door and block it open 12 Discharge high voltage capacitor 13 Disconnect the dummy resistor circuit from the sensor connector of control panel 14 Carry out necessary repair 15 Reconnect all leads removed from components during testing and repairing 16 Re install the ...

Страница 23: ...er to compose a basic standard time in the clock circuit Symbol Voltage Application VC 5V LSI IC1 4 Relay Circuit A circuit to drive the magnetron fan motor turntable motor and light the oven lamp 5 Buzzer Circuit The buzzer is responsive to signals from the LSI to emit audiblesounds keytouchsoundandcompletionsound 6 Synchronizing Signal Circuit The power source synchronizing signal is available i...

Страница 24: ...and OFF times for other power level 20 P46 IN Signal coming from touch key When either G11 line on key matrix is touched a corresponding signal out of P20 P26 will be input into P46 When no key is touched the signal is held at H level 21 P45 IN Signal similar to P46 When either G10 line on key matrix is touched a corresponding signal will be input into P45 22 P44 IN Signal similar to P46 When eith...

Страница 25: ...o P43 P46 terminal while one of G2 line keys on key matrix is touched 40 P20 OUT Key strobe signal Signal applied to touch key section A pulse signal is input to P43 P46 terminal while one of G1 line keys on key matrix is touched 41 47 P17 P11 OUT Terminal not used 48 72 SEG24 SEG0 OUT Segment data signal Connected to LCD The relation between signals are as follows LSI signal Pin No LCD Pin No LSI...

Страница 26: ... change the resistance values in parallel with R53 R57 Changing the resistance values results in that there is the same potential at both F 3 terminal of the absolute humidity sensor and AN0 terminal of the LSI The voltage of AN1 terminal will indicate about 2 5V This initial balancing is set up about 16 seconds after the unit is put in the SensorCookingmode Asthesensorcookingproceeds the food is ...

Страница 27: ...te that is equivalent to the oven door being closed Connect an external power source to the power input terminal of the touch control panel then it is possible to check and repair the controls of the touch control panel it is also possible to check the sensor related controls of the touch control panel by using the dummy resistor s 4 Servicing Tools Tools required to service the touch control pane...

Страница 28: ...citor and High voltage rectifier assembly 2 Hot parts Oven lamp Magnetron High voltage transformer WARNING FOR WIRING 1 Disconnect the power supply cord 2 Visuallycheckthedoorandcavityfaceplatefordamage dents cracks signs of arcing etc Carry out any remedial work that is necessary before operating the oven Do not operate the oven if any of the following conditions exist 1 Door does not close firml...

Страница 29: ...nd block it open 3 It is recommended that the door is removed from the oven cavity Refer to DOOR REPLACEMENT 4 Disconnect the wire leads from the power supply cord turntable motor thermal cut out oven thermal cut out MG all switches on the latch hook magnetron and oven lamp 5 Release the two 2 snap bands of the main wire harness from the oven cavity 6 Remove the two 2 screws holding the front leg ...

Страница 30: ...UND SIDE TERMINAL OF THE HIGH VOLTAGE RECTIFIER MUST BE SECURED FIRMLY WITH A GROUNDING SCREW 4 Disconnect the wire leads from the oven lamp 5 Remove the one 1 screw holding the oven lamp to the lamp angle 6 Remove the oven lamp from the lamp angle 7 Now the oven lamp socket is free REMOVAL 1 Disconnect the power supply cord and then remove the outer case 2 Remove the oven cavity assembly from the...

Страница 31: ...e rotates smooth after installation Make sure that the axis of the shaft is not slanted 6 Catch two holes of fan duct on two tabs of the base plate 7 Hold the fan duct assembly to the base plate with the two 2 screws 8 Re install the separete angles A B and C to the base plate with each one 1 screw 9 Insert the main wire harness and switch harness into the holes of the fan duct 10 Connect the wire...

Страница 32: ...install outer case and check for microwave leakage around door with an approved microwave survey meter Refer to Microwave Measurement Procedure Figure C4 Latch Switch Adjustments 1 Disconnect the power supply cord and remove outer case 2 Open the door and block it open 3 To discharge the high voltage capacitor wait for 60 seconds 4 Disconnect the wire leads from the switches 5 Push outward on the ...

Страница 33: ...fter any service make sure of the following 1 Door latch heads smoothly catch latch hook through latch holes and that latch head goes through center of latch hole 2 Deviation of door alignment from horizontal line of cavity face plate is to be less than 1 0mm 3 Door is positioned with its face pressed toward cavity face plate 4 Check for microwave leakage around door with an approvedmicrowavesurve...

Страница 34: ... and the latch spring are free CPU UNIT 7 Remove the two 2 screws holding the PWB cover to the door frame assembly 8 Remove the PWB cover from the door frame assembly 9 Remove the one 1 screw holding the CPU unit to the door frame assembly 10 Releasing the two 2 tabs remove the CPU unit with the LCD holder from the door frame assembly 11 Releasing the two 2 tabs release the LCD from the LCD holder...

Страница 35: ...cord GRY BLK GRY RED WHT WHT WHT BLK WHT 1 2 BLK BLK GRY GRN RED RED BLK RED WHT GRY BLK BLK WHT RED BLK BLK ORG THERMAL CUT OUT MG THERMAL CUT OUT OVEN MONITOR FUSE HOLDER WHT WHT GRY WHT BLK BLK RED RED GRN GRY 2 3 1 WHT WHT WHT WHT WHT BLK RY2 RY1 SECONDARY INTERLOCK RELAY CN C CN B CN F CN B T1 1 1 1 2 3 9 POWER UNIT CPU UNIT H N NOTE The grounding conductor of the power supply cord has been g...

Страница 36: ...EN LAMP TURNTABLE MOTOR FAN MOTOR AC H MICRO DOOR SENSING SWITCH NOTE IF NOT SPECIFIED 1 4W 5 CN B CN C CN F D1 D4 1N4002 RY1 RY2 D20 1SS270A D40 1SS270A Q1 2SB1238 C21 10µ 35v SP1 PKM22EPT Q21 DTD143ES Q22 DTA143ES R2 330 1w R53 1 8kF 1 4w R54 360kF 1 4w IC2 BA4558 5 8 7 4 6 R50 330 1w 3 a b c d 7 D3 D4 D2 D1 1 4 C1 0 1µ 50v C50 0 1µ 50v C2 1000µ 35v C3 10µ 35v C51 0 1µ 50v ZD1 HZ16 1 VRS1 10G471...

Страница 37: ... 270k R73 270k R71 270k R72 270k R100 15k R66 15k R65 15k R64 15k R63 15k R62 15k R61 15k R60 15k R80 1M R4 1k J10 J12 J11 4 7k J13 4 7k J15 4 7k J17 4 7k J14 J16 R5 15k R8 4 7k R7 4 7k R6 4 7k R2 4 7k LD4 CPU UNIT KEY UNIT LIQUID CRYSTAL DISPLAY VL3 COM0 COM0 COM1 COM2 SEG0 SEG1 SEG2 SEG3 SEG4 SEG5 SEG6 SEG7 SEG8 SEG8 SEG9 SEG10 COM0 LCD COM0 LCD COM1 LCD COM2 LCD COM3 LCD COM1 LCD COM2 LCD COM3 ...

Страница 38: ...N B 1 R52 R50 R4 SP1 CN A D22 D4 D2 J1 R51 D40 C51 IC2 D20 R2 C21 R1 Q1 D21 C1 S 7 1 3 4 P D3 D1 OM OM DU DU J2 E E B B Q2 RY1 RY2 T1 VRS1 R3 ZD2 2 R54 R53 CN F 1 4 3 1 5 8 C50 Q22 Q21 B B E E C3 C2 ZD1 DIP 9 1 1 2 1 2 6 4 5 1 2 3 6 4 5 1 2 3 A B C D E F G H A B C D E F G H ...

Страница 39: ...31DRE0 2 pin connector CN B 1 AC 3 1B QCNCMA470DRZZ 9 pin connector CN C 1 AF 3 1C QCNCMA237DRE0 3 pin connector CN F 1 AD C1 RC KZA087DRE0 Capacitor 0 1 uF 50V 1 AA C2 VCEAB31VW108M Capacitor 1000 uF 35V 1 AF C3 VCEAB31VW106M Capacitor 10 uF 35V 1 AA C12 VCEAB31VW106M Capacitor 10 uF 35V 1 AA C50 51 RC KZA087DRE0 Capacitor 0 1 uF 50V 2 AA D1 4 RH DZA006PRE0 Diode 1N4002 4 AD D20 22 VHD1SS270A 1 D...

Страница 40: ...RFZ LCD holder 1 AC 5 8 PSHEPA786WREZ LED sheet 1 BB 5 9 FW VZA272DREZ 9 pin wire harness 1 AL 5 10 PCOVPA372WRWZ PWB cover 1 AF 5 11 PCUSUA567WRPZ Cushion 1 AE 5 12 XEPSD38P08000 Screw 3 8mm x 8mm 4 AA 5 13 XEPSD30P08XS0 Screw 3mm x 8mm 3 AA 5 14 LHLD A237WRFZ Light guide 1 AL MISCELLANEOUS 6 1 FROLPA079WRK0 Turntable support 1 AP 6 2 NTNT A079WRF0 Turntable tray 1 AR 6 3 FW VZB827WREZ Main wire ...

Страница 41: ... requiring return should be returned as indicated in the Service Policy PACKING AND ACCESSORIES DOOR PROTECTION SHEET SPADPA204WRE0 TOP PAD ASSEMBLY FPADBA451WRKZ WRAP COVER SSAKHA072WREZ Not replaceable items PACKING CASE SPAKCD578WREZ R 370ES SPAKCD580WREZ R 370EK BOTTOM PAD ASSEMBLY FPADBA453WRKZ 6 2 TURNTABLE TRAY 6 7 INSTRUCTION BOOK PRINTING MATTER 6 1 TURNTABLE SUPPORT TRAY PAD SPADFA499WRE...

Страница 42: ...6 7 3 1 10 7 7 7 7 1 12 7 1 4 16 7 5 4 20 4 12 4 13 x2 1 4 4 22 7 1 7 9 7 11 7 11 7 13 7 15 7 10 1 9 4 4 4 11 7 3 7 2 1 8 1 8 4 1 1 1 4 25 4 6 4 24 4 28 4 28 4 17 4 18 6 6 7 14 7 14 7 12 7 13 7 8 4 19 4 21 4 31 7 7 1 5 1 4 1 3 4 5 4 30 1 2 1 3 3 1 4 14 4 8 1 11 4 15 7 5 2 5 4 4 7 1 2 1 7 3 2 2 4 9 6 1 6 2 7 13 4 3 7 1 x2 7 1 x2 4 23 1 13 4 26 6 5 4 27 2 4 7 11 ...

Страница 43: ... 3 A B C D E F G H A B C D E F G H DOOR PARTS MISCELLANEOUS Actual wire harness may be different from illustration CAPACITOR 5 13 5 11 5 12 5 12 5 12 5 10 5 9 5 6 5 13 4 7 5 7 5 1 5 14 5 6 6 3 6 4 5 2 5 8 5 4 5 12 5 3 2 5 3 1 5 3 6 8 6 9 5 5 ...

Страница 44: ...T 2001 BY SHARP CORPORATION ALL RIGHTS RESERVED No part of this publication may be reproduced stored in retrieval systems or transmitted in any form or by any means electronic mechanical photocopying recording orotherwise withoutprior written permission of the publisher ...

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