Sharp R-9H55 Service Manual

R-9h55 convection microwave oven

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SHARI=

SERVICE MANUAL

i 1 I

CONVECTION

MICROWAVE OVEN

-------------_.

MODEL

R-9H55

In interests of user-safety the oven should be restored to its original condi-

TABLE OF CONTENTS

page

GENERAL IMPORTANT

INFORMATION ......................................................................................................

WARNING ......................................................................................................................................................

RODUCT SPECIFICATIONS

.........................................................................................................................

APPEARANCE

VIEW ....................................................................................................................................

OPERATING

SEQUENCE .............................................................................................................................

FUNCTION OF IMPORTANT

COMPONENTS'

.............................................................................................

TRABLESHOOTING

CHART .......................................................................................................................

TEST PROCEDURE

....................................................................................................................................

TOUCH CONTROL PANEL .........................................................................................................................

.......................................................

.31

MICROWAVE

MEASUREMENT

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WIRING DIAGRAM ......................................................................................................................................

PICTORIAL DIAGRAM ................................................................................................................................

CONTROL PANEL CIRCUIT .......................................................................................................................

PRINTED WIRING BOAD ............................................................................................................................

PARTS LIST ................................................................................................................................................

SHARP CORPORATION

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Page 1: Table Of Contents
1 I SHARI= SERVICE MANUAL CONVECTION MICROWAVE OVEN MODEL R-9H55 -------------_. In interests of user-safety the oven should be restored to its original condi- TABLE OF CONTENTS page INFORMATION ...................... GENERAL IMPORTANT WARNING ....................................................... RODUCT SPECIFICATIONS VIEW ............................
Page 3: General Important Information
MICROWAVE OVEN R-9H55 GENERAL IMPORTANT INFORMATION This Manual has been prepared to provide Sharp Corp. Service engineers with Operation and Service Information. It is recommended that service engineers- carefully study the en- tire text of this manual, so that they will be qualified to render sat- isfactory customer service.
Page 4: Roduct Specifications
PRODUCT SPECIFICATIONS ITEM DESCRIPTION Power Requirements 240 Volts 50 Hertz Single phase, 3 wire earthed Power Consumption 1500 W (Microwave) 1600 W (Convection) Power Output 750 watts nominal of RF microwave energy (AS 2895 1986) 850 watts (IEC-705-I 988 ) Operating frequency of 2450MHz Convection heater 1500 w...
Page 5: Appearance View
APPEARANCE VIEW 1. Ventilation opening 2. Oven lamp DISPLAY 3. Door hinges 4. Door safety latches 5. See through door Convection 6. Door open button Indicator Fan Symbol’ 7. Touch control panel 8. Digital readout Micro/Defrost _ 9. Wave guide cover Symbol ‘10.
Page 6: Operating Sequence
OPERATION SEQUENCE The following is a description of component functions dur- 5. Upon completion of the cooking time, the power trans- ing oven operation. former, oven lamp, etc. are turned off and the genera- tion of microwave energy is stopped. The oven will re- Relay and Components Connection vert to the OFF condition..
Page 7 R-SHSS 2. The coil of relay (RY4) is energized by the CPU unit. 2. The shut-off relay (RYl+RYS+RYG) energized, turning The damper is moved to the closed position, opening on the oven lamp, turntable motor, cooling fan motor the damper switch contacts.
Page 8 the time of day will reappear on the display and the An example of how sensor works: oven will revert to an OFF condition. MULTI COOK MULTI COOK will automatically compute the oven tem- perature, microwave power and cooking time for baking and roasting.
Page 9 R-SHSS’ 30 32 64 (Set ) k--l, Because food cannot be cooked well by rotating the CONVECTION convection fan at that time. After sensing the steam, the MOTOR ON ; ; sensing fire operation is started. OFF / ; 4. When LSI judges it is fire in the oven cavity, LSI will 3sec -7 I- I I’...
Page 10: Function Of Important Components
R-9H55 FUNCTION OF IMPORTANT COMPONENTS STOP SWITCH UPPER AND LOWER LATCH SWITCHES The stop switch is activated by the latch head. Those latch switches are mounted in the latch hooks as When the door is opened while the oven is in cook cycle, shown in figure.
Page 11 The rated peak reverse voltage of Dl of the asymmetric It then enters the inside of the oven through the vent holes rectifier is 6 KV The rated peak reverse voltage of D2 of the provided on the left side of the oven. Next, the hot air heats cavity asymmetric rectifier is 1.7 KV.
Page 12 l-4. The signal of damper switch is m-sensed in the con- Cooking Mode Operation of Damper trol unit and shut-off relay (RY4) is turned off. Microwave cooking OPEN l-5. The 240 volts A.C. to the damper motor is stopped Convection cooking CLOSE and the motor turns off.
Page 13 3D checks and re-examine the connections the component being tested. Sharp recommend that wherever possible fault-find- ing is carried out with the supply disconnected. may in, some cases, be necessary to connect the supply after the outer case has been removed, in this event carry out 3D checks and then disconnect the leads to the primary of the power transformer.
Page 14 TEST PROCEDURE ABCDEEEFGGHIJJ POSSIBLE CASE DEFECTIVE PARTS PROBLEM :ONDITION Home fuse blows when power cord is plugged into wall outlet. Fuse M8A blows when power cord is plugged into wall outlet. 88:88 does not appear in display when power cord is first plugged into wall outlet.
Page 15 RE = REPLACE / CK = CHECK SK CH c> a -I > >...
Page 16: Test Procedure
TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER MAGNETRON TEST NEVER TOUCH ANY PART IN THE CIRCUIT WITH YOUR HAND OR AN INSULATED TOOL WHILE THE OVEN IS IN OPERATION. CARRY OUT 3D CHECKS Isolate the magnetron from the high voltage circuit by removing all leads connected to the filament terminal.
Page 17 TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 4. Operate the microwave oven at HIGH for the temperature of the water rises by a value T of (10 *2)X. 5. Stir the water to equalize temperature throughout the vessel. 6. Measure the final water temperature. (Example: The final temperature T2 = 21 “C) 7.
Page 18 A-9H55 TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST F) The time must be measured with stopwatch or wristwatch. G) After 1 minute and 51 seconds, stop the oven by opening the door. H) Put the two (2) beakers out of the oven cavity and measure the temperature of the water by stirring the water with thermometer and note them.
Page 19 R-9H55 TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST Connect the ohmmeter across the terminal B+C of the high voltage rectifier and note the reading obtained. Reverse the meter leads and note this second reading. The normal resistance is infinite one direction and mor than 100 kR in the other direction.
Page 20 > TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST BLOWN FUSE F M8A CARRY OUT 3D CHECKS 1. If the fuse M8A is blown, there could be shorts or grounds in electrical parts or wire harness. Check them and replace the defective parts or repair the wire harness. 2.
Page 21 R-9HS!f TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 2. Insulation resistance Disconnect the wire leads to the heater to be tested. Check the insulation resistance between the element and cavity using a 500V - 1 OOMohms insulation tester. The insulation resistance should be more than IOMohms in the cold start.
Page 22 TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST TOUCH CONTROL PANEL ASSEMBLY TEST The touch control panel consists of circuits including semiconductors such as LSI, ICs, etc. Therefore, unlike conventional microwave ovens, proper maintenance cannot be performed with only a voltmeter and ohmmeter.ln this service manual, the touch control panel assembly is divided into two units, Control Unit and Key Unit, and troubleshooting...
Page 23 TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST RELAY TEST Remove the outer case and check voltage between Pin Nos. 1 and 3 of the 3-pin connector (A) on the control unit with an A.C. voltmeter. The meter should indicate 240 volts, if not check oven circuit. Shut-off ,Cook and Heater Relay Test These relays are operated by D.C.
Page 24 TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST AH SENSOR TEST Checking the initial sensor cooking condition (1) The oven should be plugged in at least five minutes before sensor cooking. (2) Room temperature should not exceed 95”F(35”C). (3) The unit should not be installed in any area where heat and steam are generated. The unit should not be installed, for example, next to a conventional surface unit.
Page 25 R-9H55] TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST (4) Disconnect the sensor connector. (5) Then connect the dummy resistor circuit (see fig.) to the sensor connector of control panel. (6) Reconnect the oven to the power supply and check the sensor cook operation proceed as follows: 6-l.
Page 26: Touch Control Panel
TOUCH CONTROL PANEL ASSEMBLY OUTRINE OF TOUCH CONTROL PANEL The touch control section consists of the following units Buzzer Circuit as shown in the touch control panel circuit. The buzzer is responds to signals from the LSI to emit noticeable sounds (key touch sound and completion sound).
Page 27 DESCRIPTION OF LSI LSI( IZA501 DR) The I/O signals of the LSI(IZA501 DR) are detailed in the following table. Pin No. Signal Description VREF Reference voltaae innut terminal. A reference voltage applied to the A/D converter in the LSI. Connected to GND.(OV) Terminal to chanae cookina constant.
Page 28 Description Pin No. Signal Convection motor drivina sianal. To turn on and off the shut-off relay(RY5). “L” level during CONVECTION; “H” level otherwise. Oven lamn and Turntable motor drivina sianal. (Square Waveform : 50Hz) To turn on and off the shut-off relay(RY1). 20 msec The square waveform voltage is delivered to the RYl driving circuit and relays...
Page 29 Signal Description sin No. Anode (seament) of Fluorescent Disolav liaht-uD voltage: -3lV Vp voltage of power source circuit input. Terminal not used Seament data sianals. The relation between signals and indicators are as follows: Segment Signal Segment Signal _______________ PA 6 PO2 _________-_--_- P14 _______________ PO1 _____________--...
Page 30 Signal Description Pin No. Seament data sianal. Signal similar to P16. Kev strobe sianal. Signal applied to touch-key section. A pulse signal is input to RO-R3 terminal while one of G-8 line keys on key matrix is touched. Seqment data sianal. Signal similar to P16.
Page 31 ABSOLUTE HUMIDITY SENSOR CIRCUIT With this voltage given, the switches SW1 to SW5 in the (1) Structure of Absolute Humidity Sensor The absolute humidity sensor includes two thermistors LSI are turned on in such a way as to change the resis- tance values in parallel with R50-1.
Page 32 SERVICING 1. Precautions for Handling Electronic Components For those models, check and repair all the controls This unit uses PMOS LSI in the integral part of the (sensor-related ones included) of the touch control circuits. When handling these, parts, the following pre- panel while keeping it connected to the oven.
Page 33: Component Replacement And Adjustment Procedure
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE WARNING: AVOID POSSIBLE EXPOSURE TO MICROWAVE ENERGY. PLEASE FOLLOW THE INSTRUC- TIONS BELOW .BRBEFORE OPERATING THE OVEN. 2. Door hinge, support or latch hook is damaged. 1. CARRY OUT 3D CHECKS. 2. Make sure that a definite “click“ can be heard when the 3.
Page 34 MAGNETRON REMOVAL When removing the screws hold the magnetron 1. CARRY OUT 30 CHECKS magnetron air guide to prevent it from falling. 2. Disconnect filament lead of transfomer and high volt- 6. Remove the magnetron from the waveguide with care age wire lead from magnetron.
Page 35 CONTROL PANEL ASSEMBLY AND CONTROL UNIT REMOVAL To remove the control panel, proceed as follows: CONTROL UNIT AND KEY UNIT 1. CARRY OUT 3D CHECKS 1. Disconnect the wire connector from the control unit. 2. Disconnect connector CN-A, CN-E, CN-B, CN-F, 2.
Page 36 2) Apply the screw lock tight into the hole(for shaft) of CAUTION: the fan blade. Do not use this removed fan blade again.Because 3) Install the fan blade assemby to the shaft of fan the hole(for shaft) of it may become bigger than a motor by pushing the fan blade with a small, light standard one.
Page 37 STOP SWITCH, UPPER LATCH SWITCH, LOWER LATCH SWITCH AND MONITOR SWITCH ADJUSTMENT If those switches do not operate properly due to a misad- justment, the following adjustment should be made. 1. Loosen the two (2) screws holding the latch hook to the ‘I flange on the oven front face.
Page 38 DOOR REPLACEMENT AND ADJUSTMENT DOOR REPLACEMENT 2. Deviation of the door alignment from horizontal line of 1. Disconnect oven from power supply and remove outer cavity face plate is to be less than 1 .Omm. case. 3. The door is positioned with its face depressed toward Remove turntable tray and roller stay from oven cavity.
Page 39: Microwave Measurement
6. The microwave radiation emission should be measured at any point of 5cm or more from the external surface of the oven. SHARP Microwave leakage measurement at 5 cm distance...
Page 40 ji 2 d bi B 5 %Z z” w iz = 2% 5 502 6 Figure O-l. Oven Schematic-OFF Condition SCHEMATIC SCHEM4TIC NOTE: CCNDITICN OFOVEN NOTE: CONDITION OFOVEN 1. DOOR UOSED. 1. DOOR CLOSED. 2. COCKING TIME PRCGFIAMMED. 2. “SENSOR 03oK” PAD TOUCHED 3,VARIABLE COKING 03NTROL”HIGW 3.
Page 41 SCHEMATIC NOTE: CONDITION WOVEN CLOSED. 1. DOOR 2. CONVECTION PADTOUCHED. 3. DES1 RED TEMO. PAD TOUCHED. 4. START PADTOUCHED. 0 9 us 3 k 2 F 4: Figure O-3. Oven Schematic-Concection Cooking Condition SCHEMATIC NOTE: CONDITION WOVEN 1. DOORCLOSED. 2. MIXCOOKING PADTOUCHED. 3.
Page 42 wr;;r--;prw..T -=-tlIIIIl HIGH VOLTAGE COMPONENTS 1 MAGNETRON ASYMMETRIC TFMP n-l--l POWER SUPPLY COED Figure S-l Pictrial Diagram...
Page 44: Printed Wiring Boad
Figure S-3. Printed Wiring Boad...
Page 45: Parts List
R-9H!Xi PARTS LIST Note: The voltage supllied to the part “*” are greater than 250V. PART NO. DESCRIPTION REF. NO. ELECTRICAL PARTS RH-DZAOOSTWREO High voltage rectifier assambly l- 2 FH-HZAOlOWREO Thermistor assambly QACCAA035WREO Power supply cord l- 3 l- 4 QFS-CAOlOWREO Fuse (M8A) QFS-TAO13WREO Temperature fuse_l50'C...
Page 46 Note: The voltage supllied to the part “*” are greater than 25OV. DESCRIPTION Q’TY ZODt PART NO. REF. NO. VHDlSS270A/-1 Diode (lSS270A) D70-71 VHDlSS27OA/-1 Diode (lSS270A) D81-86 VHDlSS270A/-1 Diode (lSS270A) VHDlSS27OA/-1 Diode (lSS270A) D91-98 VHDlSS270A/-1 Diode (lSS270A) RH-IZA5OlDREO RH-IZA495DREO Hybrid IC Transistor (2SB793) VS2SB793///-4 VSDTAl43ES/lB...
Page 47 Note: The voltaae suDllied to the Dart “*‘I are areater than 25OV. REF. NO. PART NO. DESCRIPTION 1 cm (CODE 4-13 LFIX-A013WRWO Bearing holder plate 4-14 LHLDK0005YBFO Cord holder 4-15 MCAMPAO3OWRFO Damper cam MHNG-A165WRMO Oven hinge (upper) 4-16 NBLTKAOO5WREO Convection fan belt 4-17 NCPL-A021WRFO Turntable coupling...
Page 48 Note: The voltage supllied to the part “*” are greater than 25OV. DESCRIPTION Q’TY CODI PART NO. REF. NO. LX-CZ0052WREO Special screw 7- 6 LX-CZ003OWREO Special screw 7- 7 LX-NZ0029YBEO Nut 7- 8 7- 9 XBPSD3OP14KOO Screw; 31m-1 x 14mm 7-10 XBPSD40P06KOO Screw;...
Page 50 R-9H55 CONTROL PANEL PARTS < DOOR PARTS...
Page 51 MISCELLANEOUS (H.V.C) (MG-) B--e (H.V.T.) (H.V.C) may be different than illustration. PACKING AND ACCESSORIES TRAY HOLDER TURNTABLE TRAY INSTRUCTION BOOK AND COOK BOOK MICROWAVE Not replaceable items.
Page 52 SHARI= SI+MJ CORP (07KO 75E) Prtnted in Austraha...

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