Home

Sharp r-8580 Microwave Oven User Manual

1. c3 1 TQIU M 17 R 8580 TEST PROCEDURES CONT D PROCEDURE LETTER N COMPONENT TEST RELAY UNIT TEST The relay unit consists of circuits including the shut off relays buzzer transformer etc Plug power cord into wall receptacle 88 88 will be flashing in the display Remove the outer case and check voltage between Pin Nos 1 and 3 of the 6 pin connector A on the relay 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 voltage Check voltage at the relay coil with a D C voltmeter during the microwave or convection 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 CONNECTED COMPONENTS VOLTAGE COOK Approx 14 V D C Approx 14 V D C Oven lamp Turntable motor LG RY5 I D C Y6 D C HEATER Approx 14 V D C BC O O Approx 14 V D C Cooling fan motor Approx 14 V D C RD82R0O2U 18 R 8580 TEST PROCEDURES CONT D PROCEDURE LETTER COMPONENT TEST O 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
2. CABINET PARTS Base cabinet Turntable motor cover Foot Reflection sheet Rear cabinet Vibration proof cushion Cord anchorage upper Cord anchorage lower Outer case cabinet Shading cushion Schematic diagram Base cover Cord bushing Cord holder Oven lamp access cover assembly Oven lamp access cover Cushion Reflection tape FDAI AO66WRYO GCOVHAO92WRWO GLEGPOOO9YBEO PREF AOO2WREO GCABDAO27WRWO PCUSUO263WRPO LSTPPOOOSGYBFO LSTPPOOO9YBFO GCABUA141WRSO PCUSUO337WRPO TMAPCA302WRRO GCOVAAO81WRWO LBSHCOO32WREO LHLDKOOO5YBFO FFTASAOl1AWRKO GFTASAO14WRPO PCUSGAO77WRPO PSLDPAOO1WRPO CONTROL PANEL PARTS Control unit 14 connector D 6 pin connector E 3 pin connector l2 pin connector Fluorescent display D CPWBFAO95WRKO OCNCMAO86DREO OCNCMAO40DREO OCNCMAO39DREO OCNCWAO30DREO RV KXAOO02DREO tube RC KZAO32DREO Capacitor 1 F 50V RC EZA131DREO Capacitor 1000 pF 35V RC EZAO61DREO Capacitor 4 7 50V 1C5 7 20 RC KZA004DRE0 C 31 C65 C51 C53 C70 C75 Capacitor 25 39 R 8580 Note The voltage supplied to the parts are greater than 250V Refer to REPLACEMENT PARTS LIST described at after PARTS LIST REF NO PART NO DESCRIPTION CODE RC EZAO59DREO Capacitor RC EZA057DREO Capacitor 100 uF 16V RC EZAO5SDREO Ca
3. me 1285 voltage capacitor rectifier and the capacitor holder 4 Remove one 1 screw holding capacitor mounting 7 Remove the capacitor from the holder bracket TURNTABLE MOTOR AND OR COUPLING REMOVAL 1 Disconnect the oven from power supply 4 Remove the two 2 screws holding the turntable 2 Remove ane 1 screw hs motor motor to the mounting plate of the oven cavity base cabinet and take off the turntable 5 Pull the turntable coupling out of the oven cavity 3 Disconnect 2 pin connector from the turntable mo 6 The turntable free tor 30 R 8580 MAGNETRON REMOVAL 1 Disconnect oven from power supply and remove outer case 2 Discharge the high voltage capacitor 3 Disconnect wire leads from the magnetron Remove the magnetron temp fuse fitted to waveguide flange And release the wire leads from the hole of magnetron cooling duct B And re lease the AH sensor harness from hole of chassis support Remove four 4 screws holding the chassis support to cooling duct A waveguide rear cabinet control back plate Release the tab on cooling duct B to hold cooling duct A 5 Carefully remove four 4 mounting screws holding the magnetron to waveguide when remove the screws a carefull attention should be necessary to prevent the magnetron fall away Remove the magnetron with magnetron cooling duct B from the unit with a careful attention the magnetron
4. Defective magnetron Defective cook relay RY1 on relay unit Defective power transformer Defective high voltage rectifier Defective CPU unit Open or loose wiring to above compo Check and repair wiring nents Turntable motor does not operate Replace turntable motor or check and repair wiring Oven seems to be operating but little or no heat is produced in oven load Food incompletely cooked or not cooked at all at end of cook cycle Oven goes into a cook cycle but extremely uneven heating is produced in oven load food Oven does not cook properly when programed for MEDIUM etc cooking powers Operates properly on HIGH Defective CPU unit Procedure O Open or loose wiring to above compo Check and repair wiring nents Oven does not cook properly Defective EASY DEFROST function Refer to EASY DEFROST when programed in EASY DE section in operation manual FROST cooking mode and check CPU unit 12 R 8580 PROBLEMI POSSIBLE CAUSE TEST PROCEDURE OR CORRECTION CONVECTION CONV indicator light but oven Defective heater relay RY4 on relay unit Procedure N does not go into a cook cycle Defective key unit Procedure P when START pad is touched Open wiring in circuit to above compo nents above components Defective cooling fan motor Defective drive mechanism of convection fan Low power supply voltage Check voltage Thermistor shorted Procedure K
5. RD93MA2U PIN NO SIGNAL SO E24 Segment data signal Signal similar to E6 RD939A2U 24 R 8580 PIN NO 29 SIGNAL 51 E25 Used for initial balancing of the bridge circuit absolute himidity sensor PIN NO 30 SIGNAL OUT Signal to sound buzzer A Key touch sound 0 1 sec B Completion sound 2 0 sec C When the temperature of the oven cavity reaches the preset temperature in the preheating mode or when the preheating hold time 15 minutes is elapsed 1 0 sec ON 1 0 sec OFF repeat RD93LA2U PIN NO SIGNAL IRQ E27 IN Signal synchronized with commercial source frequency 50Hz This is the basic timing for time processing of LSI rasakan PIN 32 SIGNAL IN Power source voltage 5V Vc voltage of power source circuit input RD93GA1U x PIN NO 33 SIGNAL Magnetron high voltage circuit driving signal To turn on and off the cook relay In HIGH operation the signals holds L level during microwave cooking and H level while not cooking In other cooking modes MED HIGH MED MED LOW LOW the signal turns to H level and L level in repetition according to the power level PIN 34 SIGNAL I O OUT Oven lamp and turntable motor driving signal Square Waveform 50Hz To turn on and off the control relay The pulse signal 50Hz is delivered to the control relay driving circuit and cook relay heater relay control O UT RD9
6. tiV1O Vi Ad 1 HOIH oc WO SUI MUSS A91 oor im kama Fd ss ZS 41 IINA AV 138 5 of 9 2 99 5 3001 AV ldSid 1N32S34H0n14 S m O 37 R 8580 Relay Unit Control Unit Figure S 3 Printed Wiring Board 38 R 8580 PARTS LIST Note The voltage supplied to the parts are greater than 250V Refer to REPLACEMENT PARTS LIST described at after PARTS LIST REF NO PART DESCRIPTION CODE ELECTRICAL PARTS Power supply cord Monitor switch Fuse holder Magnetron temp fuse Damper switch and stop switch Upper latch switch Thermal cut out Oven lamp Oven lamp socket Turntable motor Damper motor Convection motor Cooling fan motor Convection heater Power transformer High voltage capacitor High voltage rectifier Magnetron Thermistor AH sensor Lower latch switch Monitor resistor Rectifier Fuse M8A QACCA0032WREO QSW MAO17WREO OFSHDAOO2WREO OFS TOO23WREO OSW MO174WREO QSW MAO20WREO RTHM 0054WREO RLMPTOO18WREO QSOCLAOO1WREO 4 RMOTDAO43WREO RMOTEAO70WREO RMOTEAO17WREO RHET AO3O0WREO RTRN A139WREO RC QZA029WREO RH DZAOOS8WREO RV MZAOO8WREO FH HZAOO5WREO FDTCTAOS5OWRKO QSW MAO18WREO RR WZ0025WREO RH DZAO12WREO QFS CAO10WREO
7. 20 5 C in the center of the oven tray The water container should be a low form of 600 ml beaker with inside diameter of approx 8 and made of an electrically non conductive material such as glass or plastic The placing of this standard load in the oven is im portant not only to protect the oven but also to in sure that any leakage is measured accurately Close the door and turn the oven ON with the timer set for several minutes If the water begins to boil before the survey is completed replace it with 275ml of the cool water Move the probe slowly not faster that 2 5cm sec along the gap The microwave radiation emission should be meas ured at any point of 5cm or more from the external surface of the oven RDB1103U R 8580 L S 2 4 HOLSIS3H HOLINOIW HOLIMS 4n0O 1no HOLOIN HOLIAS Jdig8viNHnl N3AO dO1S HOLSIINYSHL HOLOW NOLLO3ANOO EI Em OW H31V3H NOLLO3JANOO d CERE er H oue ue apr eT ________ B 9 u H u 9 M O H12v1 H3dadn HO ON HOLIMS d3dAVva H3dWvg iN3NOdWO 39V17 OA HOLIMS w Oo MON Eee See HOSN3S HV 0 lt i00 ud ees osse 2 R 8580 O a ul e UNIDAD joguo 2 5 eunBiJ MS pru NISN 2
8. Replacement of individual component is as follows CPU UNIT AND KEY UNIT 1 2 Remove the three 3 screws holding the CPU unit Disconnect the wire connector of CPU unit from the relay unit Remove the four 4 screws holding the panel frame to the back plate Separate the panel frame and back plate to the panel frame Lift up the control unit and disconnect the key connector from the CPU unit Now the CPU unit and frame assembly are sepa rated UPPER LATCH LOWER LATCH STOP SWITCHES AND MONITOR SWITCH ADJUSTMENT If the upper latch lower latch switches stop switch and monitor switch do not operate properly due to a mis adjustment the following adjustment should be made 1 Loosen the one 1 screw holding the upper latch hook to the oven cavity front flange and the one 1 screw holding the lower latch hook to the same flange With the door closed adjust the lower latch hook by moving it back and forth and then adjust the upper latch hook by moving it back and forth or up and down In and out play of the door allowed by the upper and lower latch hooks should be less than 0 5 mm The vertical position of the upper latch hook should be placed where the upper latch switch and monitor switch have activated with the door closed Vertical adjustment of the lower latch hook is not possible Secure the screws with washers firmly Now make sure of the upper latch switch opera tion If the upp
9. At the end of the convection cycle if the cavity air tem perature is above 118 C the circuit to will be maintained by the thermistor circuit to continue op eration of the cooling fan motor until the temperature drops below 118 C at which time the relay will be de energized turning off the fan motor Relay will however open as soon as the convection cycle has ended turning off the convection fan motor This will now cool and allow the damper door to open DAMPER OPEN CLOSE MECHANISM Usually the damper is in the open position except during convection cooking Damper position is set automatically by damper motor damper switch motor cam and damper shaft These components are operated by a signal that judges if microwave cooking or convection cooking operation is selected by the CPU unit 10 Microwave Cooking Damper is in the open position because a portion of cooling air is channeled through the cavity to remove steam and vapors given off from the heating foods It is then exhausted at the top of the oven cavity into a condensation compartment Convection Cooking Damper is in the closed position so that no hot air will be allowed to leak out the oven cavity Damper Operation 1 When power supply cord is plugged in 1 1 When power supply cord is plugged in a sig nal is sensed in the control unit and operates shut off relay RY6 Contacts of shut off relay RY6 close the damper motor is en
10. BROWN BLU BLUE G Y GREEN AND 17 YELLOW STRIPE SECTIONAL AREA OF tOmm MIN SCHEMATIC NOTE t DOOR CLOSED 2 CLOCK APPEARS ON DISPLAY BLU 17 CPU LOwER LATCH SWITCH d E DAMPER MOTOR cu CONVECTION MOTOR CONVECTION HEATER NIT 14PIN E 6 oy SWITCH Dr cN c E i E 1 wey i 1 2 BRN 17 AC CORD CONNECTION BRN BROWN BLU BLUE G Y GREEN AND YELLOW STRIPE 17 SECTIONAL AREA OF 10mm MIN SWITCH NC SENSOR COOKING SCHEMATIC NOTE CONDITION OF OVEN 1 DOOR CLOSED 2 SENSOR COOK PAD TOUCHED START PAD TOUCHED HiGH COOKING SCHEMATIC NOTE CONDITION OF OVEN 1 DOOR CLOSED 2 COOKING TIME PROGRAMMED 3 VARIABLE COOKING CONTROL HIGH 4 START PAD TOUCHED TURNTABLE MOTOR POWER TRANSFORMER CAPACITOR i 113 AC2200V RECTIFIER MAGNETRON 1 RED EN HIGH VOLTAGE RECTIFIER Figure 0 1 Oven Schematic OFF Condition Figure DAMPER LOWER Q SWITCH LATCH SWITCH d RECTIFIER E 240V 50Hz BLU 17 BRN 17 NEUTRAL TEMP FUSE 142 C CPU UPPER SWITCH O NC UNIT 4 14PIN 1 q gE 6 T 5 1 E 1 i 2 DAMPER MOTOR CONVECTION MOTOR TURNTABLE MOTOR CONVECTION HEATER POWER TRANSFORMER CAPACITOR 1134 AC2200V MAGNETRON E d
11. CONV indicator lights but heating element does not heat Temperature in the oven cavity is lower or higher than preset Lower than preset temperature Cooling fan motor turntable mo tor and oven lamp run intermitantly or all the time Convection cycle runs 3 minutes Thermistor open Procedure K then shuts down SENSOR Oven is in the sensor cooking AH sensor open and or short Procedure Q condition but AH sensor does not Defective CPU unit end stage 1 or does not stop Open or loose wire connection to the Check and repair wiring cooking cycle or the oven stops above components AH sensor assembly and or steam duct Check and repair them are not re installed correctry soon 13 R 8580 PROCEDURE LETTER A TEST PROCEDURES COMPONENT TEST MAGNETRON ASSEMBLY TEST DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPO NENTS OR WIRING To test for an open filament isolate the magnetron from the high voltage circuit A continuity check across the magnetron filament leads should indicate less than 1 ohm To test for a shorted magnetron connect the ohmmeter leads between the magnetron filament leads and chassis ground This test should indicate an infinite resistance If there is little or no resistance the magnetron is grounded and must be replaced Power output of the magnetron can be measured by performing a water tempera
12. THE UPPER LATCH SWITCH AND MONITOR SWITCH FOR PROPER OPERATION REFER TO CHAPTER TEST PROCEDURE AFTER REPLACING FUSE ALSO REPLACE MONITOR SWITCH STOP SWITCH The stop switch is activated by the lower latch head When the door is opened while the oven is in cook cycle the stop switch contacts open to de energize the relay RY 1 RY 2 RY 3 RY 4 RY 5 Then the cook cycle is stopped UPPER AND LOWER LATCH SWITCHES The lower latch switch is mounted in the lower latch hook and the upper latch switch is mounted in the upper latch hook They are activated by the latch heads on the door When the door is opened the switches interrupt the circuit to all components except CPU unit and relay unit and oven lamp A cook cycle cannot take place until the door is firmly closed thereby activating both interlock switches H s L2 2 Hes Y A A MONITOR SWITCH 7 4 MONITOR W 54 SWITCH LEVER Figure D 1 Upper Latch Switch Lower Latch Switch Monitor Switch and Stop Switch R 8580 CONVECTION HEATER The convection heater is located at the left side of the oven cavity lt is intended to heat air driven by the convection fan The heated air is kept in the oven and force circulated and reheated by the convection heater CONVECTION COOKING SYSTEM This oven is designed with a hot air heating system where food is not directly heated by the convection heater but is heated by forced circulati
13. Variable Cooking Control When the START pad is touched the following operations occur 1 The contacts of relays are closed and components connected to the relays are turned on as follows For details refer to Figure O 2 RELAY CONNECTED COMPONENTS RY 1 power transformer RY 2 oven lamp turntable motor RY 3 convection motor RY 4 convection heater RY 5 fan motor RY 6 damper motor 2 240 volts A C is supplied to the primary winding of the power transformer and is converted to about 3 3 volts A C output on the filament winding and approximately 2043 volts A C on the high voltage winding 3 The filament winding voltage heats the magnetron filament and the H V winding voltage is sent to a voltage doubler circuit 4 The microwave energy produced by the magnetron is channeled through the waveguide into the cavity feed box and then into the cavity where the food is placed to be cooked 5 Upon completion of the cooking time the power transformer oven lamp etc are turned off and the generation of microwave energy is stopped The oven will revert to the OFF condition 6 When the door is opened during a cook cycle monitor switch upper latch switch lower latch switch and stop switch are activated with the fol lowing results The circuits to the turntable motor the cooling fan motor and the high voltage com ponents are deenergized the oven lamp remains on and the digital readout displays the time still re maining i
14. analog input terminal from the AH sensor circuit and connected to the A D converter built into the LSI RD936A3U PIN NO 52 SIGNAL I O IN AH sensor input This input is an analog input terminal from the AH sensor circuit and connected to the A D converter built into the LSI RD936A2U PIN NO 53 SIGNAL I O IN Temperature measurement input OVEN THERMISTOR By inputting DC voltage corresponding to the temperature detected by the thermistor this input is converted into temperature by the A D converter built into the LSI RD935A1U PIN NO SIGNAL in Terminal not used RD93KA2U PIN NO 55 SIGNAL R8 uo OUT Terminal not used RD93KA2U PIN NO 56 60 SIGNAL R9 R13 1 0 IN Terminal not used RD93KA2U PIN NO SIGNAL SNNN Terminal not used Connected to GND RD93KASU PIN NO SIGNAL R15 IN Terminal for manufacture test Normally terminal not used RD93IA3U PIN NO SIGNAL Terminal not used RD93KA2U PINNO 94 SIGNAL jo iN Connected to GND RD93KA1U 27 R 8580 ABSOLUTE HUMIDITY SENSOR CIRCUIT 1 Structure of Absolute Humidity Sensor The absolute humidity sensor includes two thermistors as shown in the illustration One thermister is housed in the closed vessel filled with dry air while another in the open vessel Each sensor is provided with the protective cover made of metal mesh to be protected from the external airflow Internal Structure
15. chassis support and cooling duct A Remove four 4 screws holding the chassis Sup port to rear cabinet cooling duct A waveguide flange and contro panel back plate P 02 14 Remove two 2 nuts holding the motor mounting plate to the convection motor 15 Convection motor is now free Re install 1 Re install the convection motor mounting plate to the convection motor by the two 2 nuts Put the convection fan to the motor shaft fit with a E ring Re install the heater duct to the convection motor mounting plate by the three 3 screws Make sure the rotation of the convection motor Re install the thermal protection plate to cover the heatewr duct with sandwiching the thermal pro tection sheet Re install the heater unit to the left side of the oven cavity by the eleven 11 screws Re install the heater unit to thermal protection plate buttom by two 2 screws Re install the wire leads to the convection motor convection heater thermister connector Refering to Pictorial diagram 8 Re install the thermal cut out N MOTOR REMOVAL 31 6 Release the tab on cooling duct B holding cooling duct A Remove duct with the cooling fan motor from the unit The cooling fan motor assembly is now free Remove the fan blade from the cooling fan motor shaft by pulling out the fan retainer clip Remove two 2 screws and nuts holding cooling fan motor to
16. diode RD3 6EL2 DPWBFA276WRKO Relay unit QCNCMA108DREO 7 pin connector A QCNCMA115DREO 3 pin connector B QCNCMA109DREO 14 pin connector assembly C RC KZA032DREO Capacitor 0 1 uF 50V RH DZA024DREO Diode US1060M RH TX825AKREO Transistor 254937 0 RR DZ154 NDREO Resistor 150k 0 1 4W RR DZ471NDREO Resistor 470 Q 1 4W RR DZ103NDREO Resistor 10k 1 4W RY1 RY6 RRLY AO13DREO Relay OMI SH112D SP40 RALM A008DRE0 Buzzer PKM30SP TI RTRNPAO25DREO Transformer for control unit 40 rh UJ up Q tJ w J Note The voltage supplied to the parts are greater than 250V Refer to REPLACEMENT PARTS LIST described at after PARTS LIST RH VZAOO9DREO HPNLCA378WRJO GMADIAO31IWRRO DUNTKA184WREO LANGTAO46WRWO LCHSMAO22WRWO XCTSD40P12000 XHPSD30P12XS0 LX BZO198WREO FOVN AO90WRYO NCPL AO16WRFO NTNT AOO5WRHO PFILWAOOSWRPO PCOVPAO50WREO PDUC O300WRFO PDUC A144WRFO PDUC A196WRWO FFANJOO3AWRKO LSTY 0030WREO LANGFAO5OWRWO LANGKA193WRFO MLEVFO124WREO LANGKA194WRFO MELVPAO81WRFO LANGFO296WRPO FDUC AO058WRWO PCUSUO380WRPO PCUSUAOS83WRPO FFANMAOOAWRKO PREFHAO14WRWO PFPF AO018WREO PFPF AO19WREO NBRGPAOOIWREO PPACGAO25WRFO LANGTA121WRWO LBNDKAO29WREO FANGTAO56WRYO LANGQAO68WRWO PFTA AO009WRWO NSFTTAO17WRMO MCAMPAO15WRFO FHNG AO45WRYO MHNG 012 3WRMO PC
17. from this parts list such as 1 4W and 1 2W carbon resistors below is com patibility list and cross referrence information PART CODE LISTED PART CODE COMPATIBLE DESCRIPTION ERE RR DZ103NDREO VRD ST2DF103J 1 4W 10k Q small shape carbon film 077 RR Dzto2DDREO 7 VRD 02J 1 0k Q carbon film pepe RR DzZt01PDRE0 1 2W 100 carbon film PART CODE LISTED 1 0 Carbon film resistor 2 N 1 AW and small shape D 1 4W P 1 2W 3 D Carbon film resistor A D 1 4W and small shape E 1 4W 1 2W RDQ1102U 44 m SOG R 8580 CONTROL PANEL PARTS Eg rcr o l DOOR ASSEMBLY Capa R 8580 1 NONGOND ee ee 6 PACKING AND ACCESSORIES x 7 429 4 B PACKING ADD KIT B TRAY HOLDER DOOR PROTECTION SHEET X CPADBAOS51WRKO SPADFO466WREQ SPADPO338WREO BROILING TRIVET BAKING RACK x PLASTIC BAG EY _ K SSAKHOI 11WREO gt x 4 EX SS TURNTABLE TRAY 7 lt gt SA INSTRUCTION BOOK E COOK BOOK ge ul TEMP PROBE ASSY R 8580 s av TURNTABLE ROLLER STAY G PACKING CASE X SPAKCAG685WREO R 8580 TRAY PACKING SPADPO328WREO Not Replaceble Items 1 BOCHUM S 2 U 2 2 6 R 8580 48 49 R 8580 R 85
18. maintenance cannot be performed with only a voltmeter and ohmmeter In this service manual the touch control panel assembly is di vided into three units Control Unit Key Unit and Relay Unit and troubleshooting by unit re placement is described according to the symptoms indicated 1 Key Unit The following symptoms indicate a defective key unit Replace the key unit a When touching the pads a certain pad produces no signal at all b When touching a number pad two figures or more are displayed c When touching the pads sometimes a pad produces no signal 2 Control Unit The following symptoms indicate a defective control unit Replace the control unit 2 1 In connection with pads a When touching the pads a certain group of pads do not produce a signal b When touching the pads no pads produce a signal 2 2 In connection with indicators a Ata certain digit all or some segments do not light up b Ata certain digit brightness is low c Only one indicator does not light up d The corresponding segments of all digits do not light up or they continue to light up e Wrong figure appears f A certain group of indicators do not light up g The figure of all digits flicker 2 3 Other possible troubles caused by defective control unit a Buzzer does not sound or continues to sound b Clock does not operate properly c Cooking is not possible d Proper temperature measurement is not obtained Note When d
19. of Sensor Open Vent hole 2 Operational Principle of Absolute Humidity 3 Detector Sensor The figure below shows the basic structure of an absolute humidity sensor bridge circuit is formed by two thermistors and two resistors R1 and R2 The output of the bridge circuit is to be amplified by the operational amplifier Each thermister is supplied with a current to keep it heated at about 150 C 302 F and the resultant heat is dissipated in the air and if the two thermistors are placed in different humidity condi tions they show different degrees of heat conductivity leading to potential difference be tween them causing an output voltage from the bridge circuit the intensity of which is increased as the absolute humidity of the air increases Since the output is very minute it will be amplified by the operational amplifier Absolute humidity vs Operational amplifier Output voltage C Thermistor closed vesss Absolute humidity g m Absolute Humidity Circuite of Sensor Circuit This detector circuit is used to detect the output voltage of the absolute humidity circuit to allow the LSI to control sensor cooking of the unit When the unit is set in the sensor cooking mode 16 seconds later the detector circuit starts to func tion and the LSI observes the initial voltage availabel at its AN2 terminal With this voltage given the switches SW1 to SW5 in the LSI are turned on in su
20. of the touch control panel their checking is allowed if the dummy resistor s whose resistance is equal to that of those controls is used 2 Servicing the touch control panel with power supply from an external power source Disconnect the touch control panel completely from the oven proper and short both ends of the door sensing switch on PWB of the touch control panel which brings about an opera tional state that is equivalent with the oven door being closed And connect an external power source to the power input terminal of the touch control panel and then it is allowed to check and repair the controls of the touch control panel as in the case of 1 B above it is here also possible to check the sensor related controls of the touch control panel by using the dummy resistor s 4 Servicing Tools Tools required when servicing the touch control panel assembly 1 Soldering iron 30W To prevent leaking current it is recommended to use a soldering iron with a grounding terminal 2 Oscilloscope Single beam frequency range DC 10MHz type or more ad vanced model 3 Others Hand tools Other Precautions 1 Before turning on the power source of the control unit remove the aluminum foil applied for preventing static electricity 2 Connect the connectors of the indicator and key units to the control unit taking care that the lead wires are not twisted 3 After aluminum foil is removed take extra care that abn
21. the cooling duct A The cooling fan motor is now free 7 R 8580 OF W N gt NO A 03 Se mL od DAMPER ASSEMBLY REMOVAL Disconnect oven from power supply and remove outer case Discharge the high voltage capacitor Disconnect wire leads from damper motor and damper switch Do above the MAGNETRON REMOVAL from No 3 to No 6 Remove one 1 screw holding the magnetron air guide to waveguide flange Remove the magnetron air guide 7 8 9 Raise the stopper of the damper shaft and pull out the damper shaft Pull the damper ass y out of the thermal protection plate right Remove one 1 screw holding the motor to the damper 10 The damper is now free 11 Remove one 1 screw holding the damper switch to the damper 12 Now the damper switch is free CONVECTION HEATER OR CONVECTION FAN REMOVAL Do CONVECTION MOTOR REMOVAL from No 1 to No 10 Remove five 5 screws holding the convection air guide 4 40 4 41 4 42 4 45 to the heater duct Remove four 4 screws holding the convection air guide 4 38 to the heater duct The convection air guide is now free Remove two 2 screws holding heating element holders to the heater duct and remove them Remove two 2 screws holding convection heater to heater duct Pull the convection heater out of the heater duct 8 Now the convection heater is free CONVECTION FAN J 2 3 4 Do CONVECTION MO
22. transformer mtg Washer power transformer mtg Screw cabinet mtg Screw oven lamp access cover ass y mtg SCrew cord holder mtg Screw cord anchorage mtg Screw convection heater mtg AWHTZ30 05081 XFPSD40P08000 XCTWW40P10000 LX BZO1L86WREO XCTSD40P08000 LX CZ0052WREO LX CZOO63WREO XREUW30 06000 XCPSD30P10000 XBPSD50P12K00 LX CZAO020WREO LX BZAO36WREO XWHSD50 08000 XNESD40 32000 XBPSD60P14KSO XWVSD60 07000 LX BZAO55WREO XHSSB40PO8000 7 36 XCTSD40P12000 7 37 XCPSD40P27000 7 38 XBTUW40P12000 HOW TO ORDER REPLACEMENT PARTS To have your order filled promptly and correctly please furnish the following information 1 MODEL NUMBER 2 REF NO 3 PART NO 4 DESCRIPTION RDP1303U 43 R 8580 REPLACEMENT PARTS LIST This replacement parts list shows interchangeability of marked parts on the control panel parts to the alterations of product locations This list has been prepared to show LISTED PART NO along with the USED PART NO side by side RDQ1101U NO LISTED PART NO USED PART NO REF NO LISTED PART NO USED PART NO RC 2 1 DREO RC EZT475AF1E RC KZAOO0A4DREO 1 RC 2 059 RC EZT107AF1 C Common resistors have been omited
23. trouble will require that a specific test be performed These tests are given a procedure letter which will be found in the Test Procedure section IMPORTANT If the oven becomes inoperative be cause of a blown fuse in the monitor switch and upper latch switch circuit check the monitor switch and upper latch switch before replacing the fuse If the fuse is replaced the monitor switch should be replaced at same time RD81102U PROBLEM POSSIBLE CAUSE TEST PROCEDURE OR CORRECTION OFF CONDITION Home fuse blows when power cord is plugged into wall recepta cle Fuse blows when power cord is plugged into wall receptacle ness ness No power at outlet Blown fuse 88 88 do not appear in display when power cord is first plugged into wall outlet units Defective CPU unit Defective relay unit Defective key unit Defective CPU unit Defective relay unit Display does not operate properly when STOP CLEAR key is touched Buzzer should sound and time of day should appear in display Oven lamp does not light with door opened No power in home Shorted wire in power cord or wire har Shorted wire in power cord or wire har Defective monitor switch Blown magnetron temp fuse Defective thermal cut out Open wire in power cord wiring harness or wiring between control panel assembly Defective stop switch Open wire in power cord or wire harness Replace cord or check wi
24. 33A2U PIN NO 35 SIGNAL R2 OUT Heating element driving signal To turn on and off the heater relay L level during convection cooking H level otherwise During convection cooking or mix cooking the signal becomes H level when the temperature of the oven cavity exceeds the predetermined temperature PIN NO 36 SIGNAL OUT Cooling fan motor driving signal To turn on and off the cooling fan motor relay L level during both microwave and convection cooking H level otherwise PIN NO 37 SIGNAL OUT Convection motor driving signal To turn on and off the convection motor L level during CONVECTION or MIX COOK H level Se EN RD934B4U RD934B2U R 8580 PIN NO 38 SIGNAL I O OUT Damper motor relay driving signal To turn on and off the damper motor relay PIN NO 39 SIGNAL Digit selection signal Signal similar to EO PIN NO 40 SIGNAL R7 Input signal which communicates the damper open close information to LSI Damper opened H level signal Damper closed L level signal PIN NO 41 SIGNAL E37 Terminal to change functions according to model Signal in accordance with the model in operation is applied to set up its function RD934BBU Em O O C RD938A2U RD937B1U Rd93JA1U PIN NO 42 SIGNAL E36 IN Input signal which communicates the door open close information to LSI Door closed H level signal Do
25. 8 XCPSD3OPO6000 Screw damper motor and AH sensor mtg 3 AA LX BZ0207WREO Screw oven lamp socket mtg 2 AA 7 10 LX NZ0029YBEO Nut steam duct ass y and thermal 6 AA protection plate right mtg 7 11 XBTSDAOPOS8000 Screw steam duct ass y mtg 2 AA 72912 XBTUWAOPO6000 Screw waveguide cover mtg 3 AA 42 Note The voltage supplied to the parts are greater than 250V Refer to REPLACEMENT PARTS LIST described at after PARTS LIST REF NO PART NO DESCRIPTION Steamduct ass y heating element unit 7 14 and heating element mtg Screw thermal protection plate bottom convection air guide right ven support angle AH sensor cover mtg XCPSD40P08000 TeS XCTSD40P12000 Screw base cabinet mtg 7 16 LX BZOl41WREO Screw monitor switch lever mtg XBPSD40P25000 Screw cooling fan motor mtg Washer convection fan ass y mtg Screw turntable motor mtg waveguide cover mtg High voltage capacitor holder meq Base cabinet monitor resistor High voltage capacitor ass y turntable motor cover mtg Screw magnetron air guide Screw rear cabinet upper and lower latch hook mtg Screw magnetron cooling duct Ring convection motor mtg Screw oven lamp socket mounting plate mtg Screw magnetron mtg Screw upper and lower oven hinge mtg Screw cabinet mtg Washer monitor switch lever mtg Nut cooling fan motor mtg Screw power
26. 80 RDX1101U 87 SHARP CORP 9U0 75E Printed in Australia
27. A 1 NN LU HIGH VOLTAGE RECTIFIER O 2 Oven Schematic High and Sensor Cooking Condition 0858 H R 8580 AC CORD CONNECTION BRN BROWN BLU BLUE G Y GREEN AND YELLOW STRIPE 17 SECTIONAL AREA OF 1 0mm MIN SCHEMATIC NOTE CONDITION OF OVEN 1 DOOR CLOSED 2 CONVECTION PAD TOUCHED 3 DESIRED TEMP PAD TOUCHED START PAD TOUCHED 240V 50Hz OVEN BLU 17 BRN 17 THERMO CUT OUT NEUTRAL 440 C G Y 17 EARTH TEMP FUSE MONITOR RESISTOR 0 8 20W MONITOR SWITCH 142 C CPU UNIT 14PIN E 6 DAMPER CN UPPER LATCH C SWITCH STOP i i SWITCH E 2 THERM STOR TURNTABLE MOTOR CONVECTION HEATER POWER TRANSFORMER E CAPACITOR 1135 AC2200V MAGNETRON E RECTIFIER L HIGH VOLTAGE RECTIFIER Figure O 3 Oven Schematic Convection Cooking Condition R 8580 DESCRIPTION AND FUNCTION OF COMPONENTS THERMISTOR The thermistor is a negative temperature coefficient type The temperature in the oven cavity is detected through the resistance of the thermistor and then the CPU unit causes the heater relay to operate thus the current to the convection heater is turned ON OFF OVEN THERMAL CUT OUT The oven thermal cut out located on the bottom side of the thermal protection plate is designed to prevent damage to the convection heater unit if an overheated condition develops in the tube due to cooling fan fail ure obstructed air du
28. C NiA wood HS WOSN3S HY ai rac eae 3 M23 M 9 3 150 3 yooo ASV3 INVISNI 2015 WOSOISN 931312395 4 P4 ASZ 1600 931412345 LON 341 Ak lt JF 215 Az OSE ied 8 8966651 2 2i 031419395 LON 31 sum S v uo10w l 2 a 4 ee ee UN PEE 5 Er a ee ey v OON Z 1 N01123AN02 ZE F Q DE lugo ec ee V c Q Er e H 3 a an 6 v fp S f u i A ED 9 kL i A 441 p H24IMS A 8 X201831NI H EIE 9 El KITE Q p r 8 19313 anv SNI1V3H E C way EUM N3AO E n QEY i010 ar PLSI 142 1 L sost 0 266 gt TL NOL 5 OS 2v 0 01 ev 082 thy 96072 g te xL odi SAPLIVLO Oras N 8 3 5 fn gt A9L VA isn Orr UV qa 13538 7 O 0z 5 1 1 25 ONO 3 T ano L zn 7VNINH2 LIWY 234 L3 S3 q 6
29. FROST COOKING CONVECTION COOKING SENSOR COOKING AUTO MATIC MIX COOKING COMPU COOKING Set Weight Approx 31 0 kg R 8580 Auto Touch Control Panel SENSOR COOK PAD Touch to select sensor cook mode COMPU COOK PAD SENSOR COOK COMPU COOK Touch to select Compu Cook mode Fresh vegetables DEFROST P AD est Touch to defrost meat by entering weight only dinners Roast turkey Chicken pieces S ice dels ed INSTANT COOK PAD Touch once to cook for 1 minute at HIGH or increase by 1 minute multiples each time this pad is touched during HIGH VARIABLE Cooking NUMBER AND TEMPERATURE PADS Touch to enter cooking times clock time convection temperature or to select the sensor or Compu Cook categories CONVECTION COOKING FUNCTION PADS Touch to cook for each function VARIABLE COOKING CONTROL PADS Touch to select microwave power setting not touched HIGH is automatically selected Touch to select food doneness setting for Compu Cook If not touched Med Done is automatically selected TIMER HOLD PAD Touch to set minute timer or HOLD function AUTO START CLOCK PAD Touch to set clock or auto start time STOP CLEAR PAD Touch to erase during programming Touch once to stop operation of oven during Cooking touch twice to cancel cooking 3 START PAD Touch to start oven after setting programme 4 5 Roast dinner 6 Mixed grill 7 Gr
30. HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN 5 OR WIRING Disconnect the primary input terminals and measure the resistance of the transformer with an ohmmeter Check for continuity of the coils with an ohmmeter On the R x 1 scale the resistance of the primary coil should be approx 1 6 ohm and the resistance of the high voltage coil should be approximately 74 ohms the resistance of the filament coil should be less than 1 ohm HIGH VOLTAGES ARE PRESENT TO HIGH VOLTAGE TERMINAL SO DO NOT ATTEMPT TO MEASURE THE FILAMENT AND HIGH VOLTAGE C HIGH VOLTAGE RECTIFIER AND RECTIFIER TEST DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPO NENTS OR WIRING HIGH VOLTAGE RECTIFIER TEST Isolate the high voltage rectifier from the circuit Using the highest ohm scale of the meter read the resistance across the terminals and observe reverse the leads to the high voltage rectifier terminals and observe meter reading If a short is indicated in both directions or if an infinite resistance is read in both directions the high voltage rectifier is probably defective and should be replaced RECTIFIER TEST Isolate the rectifier from the circuit Using the highest ohm scale of the meter read the resistance across the terminals reverse the leads to the rectifier terminals and observe meter reading lf an infinite resistance is read in both directions the rectifier is good If a short is indicated in either direc
31. Note The ON and OFF time ratio does not correspond with the percentage of microwave power be cause approx 2 seconds are needed for heating of the magnetron filament MICROWAVE POWER MiCRO Approx 10 U 7 CONVECTION 27 7 22 Z TEMPERATURE CONVEC Z 7 180 LOW MIX BAKE MICROWAVE POWER Approx CONVECTION TEMPERATURE c oe im HIGH MIX ROAST R 8580 Note During alternate Microwave Convection opera tion the convection heater Is energized only if the cavity temperature drops below the set tem perature SENSOR COOKING CONDITION Using the SENSOR COOK function the foods are cooked without figuring time power level or quantity When the oven senses enough steam from the food it relays the information to its microprocessor which will calculate the remaining cooking time and power level needed for best results When the food is cooked water vapor is developed The sensor senses the vapor and its resistance in creases gradually When the resistance reaches the value set according to the menu Supplementary cook ing is started The time of supplementary cooking is determined by experiment with each food category and inputted into the LSI An example of how sensor works 1 Broccoli at room temperature Vapor is emitted very slowly Way Vm PE 2 Heat broccoli Moisture and humidity is emitted rapidly You can smell the aroma as it cooks SENS
32. OR abu a 3 Sensor detects moisture and humidity and calcu lates cooking time and variable power Cooking Sequence 1 Touch SENSOR COOK pad NOTE The oven should not be operated on SEN SOR COOK immediately after plugging in the unit Wait five minutes before cooking on SENSOR COOK 2 Select desired Sensor setting 3 Touch START pad The coil of shut off relays RY2 RY5 are energized the oven lamp and cooling fan motor are turned on but the power transformer is not turned on 4 After about 16 seconds the cook relay RY1 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 re move any vapor from the oven cavity and sensor NOTE During this first stage do not open the door or touch STOP CLEAR pad 5 When the sensor detects the vapor emitted from the food the display switches over to the remaining cooking time and the timer counts down to zero At this time the door may be opened to stir food turn it or season etc 6 When the timer reaches zero an audible signal sounds The shut off relay and cook relay are de energized and the power transformer oven lamp etc are turned off 7 Opening the door or touching the STOP CLEAR pad the time of day will reappear on the display and the oven will revert to an OFF condition COMPU COOK COMPU COOK will automatically compute the oven temperature m
33. OVPAO18WRWO PGIDHAOO9WRWO PGIDHAO21WRWO PGIDHAO11WRPO PSKR AO067WRWO PSKR AO68WRWO PSKR AO069WRWO PSKR AO70WRWO PSKR AO79WRWO PSKR AOS8O0WRWO PCUSUAO83WRPO PCUSUAO82WRPO PSPA AO021WRFO PREFHAO19WRWO PCUSUAO85WRPO PCUSUAOD84WRPO PCUSGOO78YBPO PFPF AO24WREO Ui i CO NO ND S Thermal protection sheet right A DESCRIPTION Varistor 14DK471J Control panel frame Display filter Key unit Key unit angle Control panel back plate Screw Key unit angle and control panel back plate mtg Screw cpu unit mtg Screw relay unit mtg OVEN PARTS Oven cavity Turntable rolier stay Turntable support roller Turntable coupling Turntable tray Lamp filter Waveguide cover Magnetron cooling duct A Magnetron cooling duct B Heater duct Fan blade ass y Fan retainer clip Chassis support Upper latch hook Monitor switch lever Lower latch hook Stop switch lever Oven support angle Steam duct Steam duct cushion C Steam cushion Convection fan ass y Thermal protection ass y left Thermal protection plate right Thermal protection sheet left Thermal protection sheet right Bearing Bearing packing Thermal protection plate for convection motor Heating element holder Shaft mounting plate ass y Convection motor mounting plate Damper Damper shaft Damper ca
34. SHARP SERVICE MANUAL 5970688580 CONVECTION MICROWAVE OVEN MODEL 8580 In the interests of user safety the set should be restored to its original condition and only parts identical to those specified should VERAT TABLE OF CONTENTS Page PRECAUTIONS INSIDE FRONT COVER FOREWORD PRODUCT DESCRIPTION OPERATION SERVICING MICROWAVE MEASUREMENT PROCEDURE PICTORIAL DIAGRAM PRINTED WIRING BOARD PARTS LIST 7 5 7 SHARP CORPORATION SERVICE MANUAL SHARP CONVECTION MICROWAVE OVEN R 8580 FOREWORD This Manual has been prepared to provide Sharp Corp Service Personnel with complete Operation and Service Information for the SHARP CONVECTION MICROWAVE oven R 8580 It is recommended that service personnel carefully study the entire text of this manual so they will be qualified to render satisfactory customer service Check interlock switches and door seal carefully Special at tention should be given to avoid electrical shock and microwave radiation hazard RD36102U CAUTION MICROWAVE RADIATION Personnel should not be exposed to the microwave energy which may radiate from the magnetron or other microwave generating devices if it is improperly used or connected All input and output microwave connections waveguides flanges and gaskets must be secured Never operate the device without a microwave energy absorbing load attached Never look into an open waveguide or antenna whi
35. TOR REMOVAL from No 1 to No 13 Remove two 2 screws holding the shaft mounting plate ass y to the heater duct Pull the convection fan and washer out of the heater duct Convection fan is now free UPPER LATCH SWITCH MONITOR SWITCH REMOVAL Disconnect oven from power supply and remove outer case Discharge the high voltage capacitor Disconnect the wire leads from the switches Remove the one 1 screw holding the upper latch hook to the oven flange Remove the upper latch hook assembly from oven flange Push outward on the two 2 retaining tabs holding the switch in place The switch is now free Re install 1 Re install each interlock switch in its place The monitor switch is in the upper position and the up per latch switch is in the lower position Re connect the wire leads to each switch Refer to the pictorial diagram Secure the upper latch hook with the one 1 mounting screw to the oven flange Make sure that the monitor switch and upper latch switch are operating properly Refer to chapter Test Procedure and Adjustment procedure RDA1203U LOWER LATCH SWITCH AND STOP SWITCH REMOVAL Disconnect the oven from the power supply and remove the outer case Discharge the high voltage capacitor Disconnect the wire leads from the switches Remove the one 1 screw holding the lower latch hook to the oven cavity front frange Remove the lower l
36. a dry cloth or paper towel 6 The Sensor works with food at normal storage temperature For example chicken pieces would be at refrigerator temperature and canned soup at room temperature 7 Avoid using aerosol sprays or cleaning solvents near the oven while using Sensor set tings The sensor will detect the vapor given of by the spray and turn off befor food is properly cooked 8 After 30 minutes if the sensor has not detected the vapor of the food ERROR will appear and the oven will shut off Water load cooking test Make sure the oven has been plugged in at least five minutes before checking sensor cook op eration The cabinet should be installed and screws tightened 1 Fill approximately 200 milliliters 7 2 oz of tap water in a 1000 milliliter measuring cup 2 Place the container on the center of tray in the oven cavity 3 Close the door 4 Touch SENSOR COOK pad and number pad 1 Now the oven is in the sensor cooking condition and SC 1 will appear in the display 5 Touch Start pad The oven will operate for the first 16 seconds without generating micro wave energy When the AH sensor is defective open or short ERROR will appear in the display after 16 seconds cooling time If ERROR appears check sensor wire connections and or AH sensor NOTE ERROR will appear if the door is opend or STOP CLEAR pad is touched during first stage of sensor cooking 6 After approximately 16 seconds microwave energy is produced oven s
37. ash right HDECQAO74WRFO Door sash left HDECQAO72WREO Door sash upper HDECQAO73WREO Door sash lower DDORFA115WRYO Door panel ass y PGLSPAIO6WREO Door glass PPACGO105WREO Door packing GCOVHAIOAWRFO Choke cover HDECQAO76WRFO Door handle 5 15 HDECAAO72WREO Door decolation plate left i C NO ES MISCELLANEOUS FAMI AOOS8WREO Low rack FAMI AOO9WREO High rack QW HZOO59WREO High voltage wire A Trans Capa OW QOZ0114WREO High voltage wire B Mag Capa FW VZA396WREO Main wire harness TSPCNA664WRR2 Name FW VZA398WREO Thermistor harness LBNDCQOOACBEO Wire holder WH 1 M LHLDWOQOOAYBEO Wire holder purse look L OTANPOO20YBEO Connector TCAUHO114WRRO Caution label TCADCO222WRRO Cook book TINSEA295WRRO Operation manual LHLDWQOOSYBEO Wire holder purse lock N F2 PD n SCREW NUTS WASHERS AND PINS LX CZOO5OWREO Screw door handle mtg 3 AA LX CZOO17WREO Screw convection air guide 13 AA 0 thermistor mtg XCPSDAOPO6OO0 Screw spacer mtg 3 AA LX CZOOA3WREO Screw shaft mounting plate 10 AA convection motor mounting plate and thremal protection plate left mtg 7 5 LX NZOO81WREO Nut convection motor mtg 2 AA G XCPWW3OP12XWO Screw heating element holder mtg 2 AA we 5030 14 0 Screw damper switch mtg 1 AA I
38. atch hook from the flange by moving it downward To remove the individual switch from the lower latch hook push outward the two 2 retaining tabs holding the switch in place The switch is now free 32 Re install 1 Re install each interlock switch in its place The stop switch is in the upper position and the lower latch switch is in the lower position Re connect the wire leads to each switch Refer to the pictorial diagram Secure the lower latch hook with the one 1 mounting screws to the oven flange Make sure that the lower latch switch and stop switch are operating properly Refer to chapter Test Procedure and Adjustment procedure RDA1203U RDA1203U R 8580 CONTROL PANEL ASSEMBLY AND CPU UNIT REMOVAL The complete control panel should be removed for re placement of components except the relay unit To remove the control panel proceed as follows 1 WU OR Ge Disconnect oven from power supply and remove outer case Discharge the high voltage capacitor Disconnect the wire connectors and wire leads from the relay unit and CPU unit Disconnect a connector from the CPU unit Remove one 1 screw holding the control panel back plate to the chassis support Remove the two 2 screws holding the bottom edge of the back plate to the cabinet base Remove one 1 screw holding the back plate to the oven cavity flange Lift up and pull the control panel forward
39. ch a way as to change the resistance values in parallel with R50 1 Changing the resistance values results in that there is the same potential at both F 3 terminal of the absolute humidity sensor and terminal of the 151 The voltage of AN2 terminal will indicate about 2 5V This initial balancing is set up about 16 seconds after the unit is put in the Sensor Cooking mode output voltage characteristi 28 As sensor cooking proceeds the food is heated to generate moisture by which the resistance balance of the bridge circuit to deviate increasing the volt age available at AN2 terminal of the LSI Then the LS observes that voltage at AN2 terminal and compares it with its initial value and when the comparison rate reaches the preset value fixed for each menu to be cooked the 51 causes the unit to stop sensor cooking thereafter the unit goes into the next necessary operation automatically When the LSI starts to detect the initial voltage at AN2 terminal 16 seconds after the unit has been put in the Sensor Cooking mode if it is im possible to take a balance of the bridge circuit due to dis connection of the absolute humidity sensor ER ROR will reappear on the display and the cooking Is stopped RD72001U 1 Absolute humidity sensor circuit Q50 R50 Resistor block Thermistor in closed vessel S Thermistor in open vessel 15 2 Internal equivalent circuit of 12 V cc O he d
40. cts dirty or blocked air intake etc Under normal operation the oven thermal cut out re mains closed However when abnormally high tem peratures are reached within the heater unit the oven thermal cut out will open cousing the oven to shut down When the oven has cooled temperature the oven thermal cut out closes MONITOR SWITCH The monitor switch is mounted on the upper latch hook It is activated the contacts opened by the up per latch head when the door is closed The switch is intended to render the oven inoperative by means of blowning the fuse when the contacts of the common and normal open contacts of upper latch switch fail to open when the door is opened Functions 1 When the door is opened the monitor switch con tacts close to the ON condition due to their being normally closed At this time the the common and normal open contacts of upper latch switch are in the OFF condition contacts open due to their being normally open contacts switch 2 As the door goes to a closed position the monitor switch contacts are first opened and then the common and normal open contacts of upper latch switch close On opening the door each of these Switches operate inversely 3 If the door is opened during cooking and the common and normal open contacts of upper latch Switch fail to open the monitor fuse blows simul taneously with closing of the monitor switch con tacts CAUTION BEFORE REPLACING A BLOWN FUSE TEST
41. d and number 0 pad 6 2 The control panel is in the sensor cooking operation 6 3 After approximately 20 seconds push plunger of select switch This condition is same as judgement by AH sensor 6 4 After approximately 3 seconds cooking operation turns off an audible signal will sound and the display will then revert to the time of day If the above is not the case the control unit is probably defective If the above is proper the AH sensor is probably defective Plunger a NC To Connector F NO on Control Unit CONNECTOR COM 1 R1 R2 1000 1 1 2W ecce tae Drm R3 596 1 4W F 2 4 COM R4 12 0 5 1 4W F 3 4 oof Switch Sensor Dummy Resistor Circuit R PROCEDURES TO BE TAKEN WHEN THE FOIL PATTERN ON THE PRINTED WIRING BOARD PWB IS OPEN To protect the electronic circuits this model is provided with a fine foil pattern added to the primary on the PWB and this fine pattern service as a substitute coil If the foil pattern is open follow the troubleshooting guide given below for repair Problem POWER ON indicator does not light up TEPS CAUSE OR CORRECTION 1 The rated voltage is not applied to POWER terminal Check supply voltage and oven main unit of CPU connector CN A 2 The rated voltage is applied to primary side of power Power transformer or secondary circuit defective transformer Check and repair Only pattern at a is br
42. detects absolute humidity of a food which is under cooking to allow its automatic cooking RD91GA1U 8 Door Sensing Switch A switch to tell the LSI if the door is open or closed RD91BA2U 9 Relay Circuit To drive the magnetron heating element fan mo tor convection motor damper motor turntable motor and light the oven lamp RD91CB1U 10 Indicator Circuit Indicator element is a Fluorescent Display Basically a Fluorescent Display is triode having a cathode a grid and an anode Usually the cathode of a Fluorescent Display is directly heated and the filament serves as cathode The Fluorescent Display 7 digits 15 segments are used for displaying figures RD91DA1U R 8580 DESCRIPTION OF LSI LSI IZA096DR The 1 0 signal of the LSI IZA096DR is detailed in the following table PIN NO SIGNAL EO E5 I O OUT Digit selection signal Refer to the touch control panel circuit about the relation between signals and digits RD93101U Normally one pulse is output in every synchronized signal period and input to the grid of the fluorescent SIR RD9 INNO 7 SIGNAL jo Segment data signals Refer to the touch control panel circuit for the relationship between signals and indicators Normally one pulse is output in every synchronized signal period and input to the anode of the ola v No 8 SIGNAL out Segment signal Signal similar to E6 Key
43. e occasional appearance of moisture light or the sensing of gentle air movement around the oven door is not abnormal and do not of themselves indicate a leakage of microwave energy from the oven cavity If such were the case your oven could not be equipped with a vent the very purpose of which is to exhaust the vapor laden air from the oven cavity OUTER CASE CABINET OVEN FACE PLATE RDA1203U R 8580 MICROWAVE MEASUREMENT After adjustment of door latch switches monitor switch and door are completed individually or collec tively the following leakage test must be performed with a survey instrument and it must be confirmed that the result meets the requirements of the performance standard for microwave oven REQUIREMENT The safety switch must prevent microwave radiation emission in excess of 5mW cm2 at any point 5cm more from external surface of the oven PREPARATION FOR TESTING Before beginning the actual test for leakage proceed as follows 1 Make sure that the test instrument is operating normally as specified in its instruction booklet Important Survey instruments that comply with the require ment for instrumentations as prescribed by the per formance standard for microwave ovens must be used for testing 35 Recommended instruments are NARDA 8100 NARDA 8200 HOLADAY H1 1500 SIMPSON 380M Place the oven tray into the oven cavity Place the load of 275 15ml of water initially at
44. e we em uia 1 O vvis 2 2 1 R 8580 SERVICING 1 Precautions for Handing Electronic Components This unit uses PMOS LSI in the integral part of the circuits When handing these parts the following precautions should be strictly followed PMOS LSI have extremely high impedance at its Input and output terminals For this reason it is easily influenced by the surrounding high voltage power source static electricity charged in clothes etc and sometimes it is not fully protected by the built in protection circuit In order to protect PMOS LSI 1 When storing and transporting thoroughly wrap them in aluminum foil Also wrap PW boards containing them in aluminium foil 2 When soldering ground the technician as shown in the figure and use grounded soldering iron and work table approx B C B 5 890 EC E 8 7 R110 9 R50 Transistor Transistor Transistor 1 16 R112 258793 2SA937 DTA143ES Resistor Block DTD143A 4 5 R50 R90 R110 114 5 y R112 Servicing of Touch Control Panel We describe the procedures to permit servicing the touch control panel of the microwave oven and the cautions you must consider when doing so To carry the servicing power supply to the touch control panel is available either from the power line of the oven proper itself of from an external power source 1 Servicing the touch control panel with
45. efective components the Control Unit Key Unit or Relay Unit are replaced the defective part or parts must be properly packed for return in the shipping carton with its cushion material in which the new replacement part was shipped to you T P KEY UNIT TEST If the indicator does not respond to touching a key Pad use the following matrix and place a jumper wire between the proper pin connections making momentary contact with the cable connector disconnected from the control unit If the indicator responds and oven goes into operation the key unit was faulty If there is no response replace the control unit KEY UNIT 19 R 8580 TEST PROCEDURES CONT D PROCEDURE LETTER COMPONENT TEST Q AH SENSOR TEST Checking the initial sensor cooking condition 1 The oven should be plugged in at least five minutes befor sensor cooking 2 Room temperature should not exceed 35 C 3 The unit should not be installed in any area where heart and steam are generated The unit should not be installed for example next to a conventional surface unit Refer to the INSTALLATION Instruction 4 Exhaust vents are providend on the back of the unit for proper cooling and air flow in the cavity To permit adequate ventilation be sure to install so as not to block these vents There should be some space for air circulation 5b Be sure the exterior of the cooking container and the interior of the oven are dry Wipe off any moisture with
46. emperature is reached a beep signal will sound indicating that the holding temperature has been reached in the oven cavity Open the door and place the food to be cooked in the oven Program desired cooking time and convection temper ature by touching the NUMBER pad CONVECTION pad and Temperature pad When the START pad is touched the following oper ations occur 1 The numbers of the digital readout start the count down to zero 2 The oven lamp turntable motor cooling fan motor and convection motor are energized 3 Heater relay RY4 is energized if the cavity tem perature is lower than the selected temperature and the main supply voltage is applied to the con vection heater to return to the selected cooking temperature 4 Upon completion of the cooking time the audible signal will sound and oven lamp turntable motor cooling fan motor and convection motor are _ de energized At the end of the convection cycle if the cavity air temperature is above 118 C the circuit to RY5 will be maintained by the thermistor circuit to continue operation of the cooling fan motor until the temperature drops below 118 C at which time the relay will be de energized turn ing off the fan motor Relay will however open as soon as the convection cycle has ended turning off the convection fan motor This will now cool and allow the damper door to open R 8580 5 At the end of the convection cook cycle shut off
47. er latch switch has not activated with the door closed loose the one 1 screw holding the upper latch hook to the oven cavity front flange and adjust the upper latch hook position After the adjustment make sure of the following 1 The in and out play of the door remains less than 0 5 mm at latched position First check the upper latch hook position pushing and pulling the upper portion of door toward the oven face Then check the lower latch hook position pushing and pulling the lower portion of door toward the oven face Both results plays of the door should be less than 0 5mm 33 2 9 4 The upper latch lower latch switches the circuit before the door can be opened The monitor switch contacts close when the door is opened Re install the outer case and check for microwave leakage around the door with an approved micro wave survey meter Refer to Microwave Measure ment Procedure LATCH SWITCH Figure C 1 Latch Switches Adjustment RDA1203U R 8580 DOOR REPLACEMENT AND ADJUSTMENT DOOR REPLACEMENT 1 Disconnect oven from power supply and remove outer case 2 Holding the door remove three 3 screws securing the upper door hinge to the oven cavity The door assembly is nowfree from the oven cavity 3 On re installing new door assembly secure the door assembly with the three 3 mounting screws to the oven cavity Make sure the door is parallel with the bottom
48. ergized opening the damper door When the damper is moved to the open posi tion by the damper cam dampe switch is closed ON position The signal of damper switch is re sensed in the control unit and shut off relay RY6 is turned off The 240 volts A C to the damper motor is stopped and the motor turns off 1 2 1 3 154 1 5 2 When oven is microwave cooking Damper is in the open position 3 When oven is convection cooking 3 1 Damper motor is energized by touching the convection temperature and START pads When damper is in the closed position damper switch is OFF its signal is sensed by the control unit and shut off relay RY6 is de energized The damper is held in the closed position during the convection cooking operation At the end of the convection cooking shut off relay RY6 is energized and the damper is returned to the open position 3 2 3 3 3 4 NOTE If the damper door is not in the proper position closed durin convection or open durning microwave the control unit will stop oven op eration after 1 minute Cooking Mode Operation of Damper Microwave cooking OPEN Convection cooking CLOSE Sensor cooking OPEN Automatic mix cooking CLOSE Grill cooking CLOSE Slow cooking CLOSE R 8580 SERVICING TROUBLESHOOTING GUIDE When troubleshooting the microwave oven it is helpfull to follow the Sequence of Operation in per forming the checks Many of the possible causes of
49. es overheating of the magnetron assembly Check for restricted air flow to the magnetron through the opening in the chassis especially the cooling duct and colling fan l THERMAL CUT OUT A continuity check across the thermal cut out terminalis should indicate a closed circuit unless the temperature of the thermal cut out reaches approximately 140 C The termal cut out resets automatically at approximately 115 C If the thermal cut out has opened under the normal condition replace the same one is parts list An open thermal cut out indicates overheating of the heater unit Check for restricted air flow to the heater unit through the vent holes of the oven cavity especially the heater duct and con vection fan m E EDAR 16 R 8580 TEST PROCEDURES CONT D PROCEDURE LETTER COMPONENT TEST J CONVECTION HEATER TEST Make sure the convection heater is fully cooled and test as follows a Disconnect wire leads and measure the resistance with an ohmmeter On the R x 1 scale the resistance between the convection heater terminals should be approximately 38 ohms b Disconnect wire leads and measure the insulation resistance with 500V 100M Q insulation resistance meter The insulation resistance between convection heater terminal and cavity should be more than 0 5M Q K THERMISTOR TEST Disconnect connector E from the control unit Measure the resistance of the thermistor with an ohmmeter Connect the ohmmeter leads to Pin No
50. hould turn off when water is boiling bubling If the oven does not turn off replace the AH sensor or check the control unit refer to expla nation below 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 re placement sensor 1 Disconnect oven from power supply and remove outer case 2 Discharge the high voltage capacitor 3 Remove the AH sensor 4 Install the new AH sensor 5 Re install the outer case 6 Reconnect the oven to the power supply andcheck the sensor cook operation proceed as follows 6 1 Touch SENSOR COOK pad and number 0 pad 6 2 Touch Start pad The control panel is in automatic Sensor operation 6 3 The oven will turn off automatically when the water is boiling bubling If new sensor dose not operate properly the problem is with the control unit R 8580 TEST PROCEDURES CONT D T PROCEDURE LETTER COMPONENT TEST CHECKING CONTROL UNIT 1 Disconnect oven from power supply and remove outer case 2 Discharge the high voltage capacitor 3 Disconnect the wire leads from the cook relay 4 Disconnect the sensor connector that is mounted to lower position of control panel 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 1 Touch SENSOR COOK pa
51. icrowave power and cooking time for baking roasting and broiling Set the desired program by touching the COMPU COOK pad and number pad Enter the weight by touching the Number pads When the START pad is touched the following oper ations occur 1 The COOK indicator will light and the Convection Fan Symbol will rotate 2 The cooking time will appear on the display and start counting down to zero The cooking time is adjusted automatically ac cording to the weight of the food 3 The shut off relays RY2 RY3 RY4 and RY5 energized turning on the oven lamp turntable motor cooling fan motor and convection motor The power supply voltage is added to the con vection heater 4 Now the oven is in the convection cooking mode 5 When the oven temperature has reached the pro grammed convection temperature the oven goes into the programmed cooking mode 6 At the end of the COMPU COOK cycle the damper is returned to the open position and the oven will go to the off condition The cooling fan will remain on until the oven has cooled EASY DEFROST COOKING The EASY DEFROST key is a special function key to defrost meats and poultry faster and better EASY DEFROST key has 4 defrost stages EASY DEFROST automatically defrosts roast beef etc When EASY DEFROST is selected and the food weight is entered by using the number pads the oven will cook according to the special cooking sequence AC CORD CONNECTION BRN
52. illed chicken 8 9 0 CONDOM b GA Bread loaves Cake layers Biscuits LOW MIX BAKE HIGH MIX rr MED HIGH Med Well AUTO START CLOCK R 8580 OPERATION DESCRIPTION OF OPERATING SEOUENCE The following is a description of component functions during oven operation RD71101U OFF CONDITION Closing the door activates both door interlock switches upper latch switch lower latch switch and stop switch In this condition the monitor switch contacts are opened When oven is plugged in 240 volts A C is supplied to the relay unit Figure O 1 1 The display will show flashing 88 88 To set any program or set the clock you must first touch the STOP CLEAR pad The display will clear and 1 00 will appear and count up every minute Note When the door is opened the oven lamp comes on 2 A signal is input to the control unit energizing the coil of shut off relay RY6 RY6 contacts close completing a circuit to the damper motor The damper motor now operates moving the damper to the open position thereby closing the contacts of the damper switch inputs a signal to the control unit The coil of relay RY6 is de energized opening its contacts thereby turning off the damper motor RD71207U COOKING CONDITION HIGH COOKING Program desired cooking time and Variable Cooking Control by touching the NUMBER pads and the HIGH pad of the
53. ion A pulse signal is input to 4 7 terminal while one of G 6 line keys on key matrix is touched RD939A2U RD939A3U PIN NO 17 SIGNAL E16 1 0 OUT Segment data signal Signal similar to E6 Key strobe signal Signal applied to touch key section A pulse signal is input to AN4 AN7 terminal while one of G 7 line keys on key matrix is touched PIN NO SIGNAL E17 OUT Segment data signal Signal similar to Key strobe signal Signal applied to touch key section A pulse signal is input to ANA AN7 terminal while one of G 8 line keys on key matrix is touched PIN NO 19 20 SIGNAL E18 E19 OUT Segment data signal Signal similar to E6 PIN NO 21 24 SIGNAL E20 E23 1 0 OUT Used for initial balancing of the bridge circuit absolute himidity sensor PIN NO 25 SIGNAL I O IN internal clock oscillation frequency_input setting The internal clock frequency is set by inserting the ceramic filter oscillation circuit with respect to X terminal RD939A3U RD939A3U RD939A2U RD936A1 VU RD9S3EA2U PIN NO SIGNAL X OUT Internal clock oscillation frequency control output Output to control oscillation input of EX RDS3EA1U PIN NO SIGNAL RESET I O IN Auto clear terminal Signal is input to reset the LSI to the initial state when power is supplied Temporarily set to L level the moment power is supplied at this time the LSI is reset Thereafter set at H level
54. k the monitor switch operation by using the ohmmeter as follows When the door is open the meter should indicate a closed circuit When the monitor switch actuater is pushed by a screw driver through the upper latch hole on the front plate of the oven cavity with the door opened in this condition the plunger of the monitor switch is pushed in the meter should indicate an open circuit If improper operation is indicated replace the defective switch After testing the monitor switch re connect the wire lead to the monitor switch NC terminal S e MONITOR SWITCH S Jue MONITOR SWITCH LEVER G BLOWN FUSE If the fuse in the upper latch monitor switch circuit is blown when the door is opened check the upper latch switch and monitor switch according to the Test Procedure for those switches before replacing the blown fuse If the fuse is replaced the monitor switch should be replaced at the same time If the fuse is blown by improper switch operation adjust or replace the defective switch fuse at the same time the fuse monitor switch even if the switches operate normally CAUTION REPLACEMENT FUSE MUST BE THE LISTED FUSE IN PARTS LIST H TEMP FUSE TEST A continuity check across the temp fuse terminals should indicate a closed circuit If the temperature of the magnetron reaches 142 C the temp fuse opens If the temp fuse has opened replace the fuse An open temp fuse indicat
55. le the device is energized Note Parts List The parts marked are used in voltage more than 250V RD36202U SHARP CORPORATION OSAKA JAPAN RD37201U SS TOUCH CONTROL PANEL ASSEMBLY COMPONET REPLACEMENT AND ADJUSTMENT MICROWAVE MEASUREMENT M R 8580 ces R 8580 PRODUCT DESCRIPTION SPECIFICATION ITEM DESCRIPTION Power Requirements 240 Volts 50 Hertz Single phase 3 wire earthed Power Consumption 1400W Microwave 1600W Convection Power Output 700 watts normal of RF microwave energy 2 liter water load Operating frequency of 2450MHz Convection Heater Power Output 1500 Watts Case Dimensions Width 627mm Height 407mm Depth 500mm Cooking Cavity Dimensions Width 395mm Height 253mm Depth 422mm Control Complement Touch Control System Clock 1 00 12 59 Timer 0 99 min 99sec Microwave Power for Variable Cooking Repetition Rate PUGH Full power throughout the cooking time MED HIGH otro eris met approx 7096 of Full Power MED adscendit M M approx 5096 of Full Power MED LOW DEFROST approx 3096 of Full Power Bol E approx 1096 of Full Power HOLD tis power throughout the cooking time Convection Temperature Control Range 40 C 250 C AUTO START COOKING INSTANT COOKING EASY DE
56. line of the oven face plate and the latch heads pass through the latch holes correctly Note After any service to the door an approved microwave survey meter should be used to as sure compliance with proper microwave rediation standard Refer to Microwave Measurement Procedure Note If the Latch Heads Need Removal TORX T 20 or LHXTIX LR 3 Type screwdriver should be used TORX screw DOOR ASSEMBLY TORX SCREW T 20 N LATCH HEADS Figure C 2 Door Assembly Replacement and Adjustment 34 DOOR ADJUSTMENT When removing and or loosening hinges such as in the case of a door replacement the following adjustment criteria are taken Door is adjusted to meet the fol lowing three conditions before tightening the hinge screws 1 Adjust door latch heads at a position where they smoothly catch the latch hooks through the latch holes Refer to upper latch and lower latch switches adjustments 2 Deviation of the door alignment from the horizontal line of cavity face to be less than 1mm 3 Door should be adjusted with its face depressed toward cavity face After hinge screws are tightened under foregoing con ditions recheck 1 and 2 Note The door on a microwave oven is designed to act as an electronic seal preventing the leakage of microwave energy from the oven cavity during the cookcycle This function does not require that the door be airtight moisture condensation tight or light tight Therefore th
57. m Oven hinge lower Oven hinge upper Sensor cover Convection air guide A Convection air guide B Magnetron air guide Convection air guide upper C Convection air guide inside D Convection air guide lower Air barrier right Air barrier right Convection air guide H Steam duct cushion Damper cushion Spacer Thermal protection plate bottom Steam cushion B Air guide cushion Spacer cushion 41 PRR RP RRP RP BPR EE PREP FP PWR gt PrP p up PY op EOS OQ U tg Z 3 iO U OQ GO R 8580 Note The voltage supplied to the parts are greater than 250 Refer to REPLACEMENT PARTS LIST described at after PARTS LIST REF NO PART NO DESCRIPTION PFPF A025WREO Thermal protection sheet right B PFPF AO26WREO Thermal protection sheet bottom PCUSUO326WRPO Cushion PGISHAO24WREO Heater insulator PGISHAO25WREO Heater insulator B PGISHAO26WREO Round insulator A PGISHAO27WREO Round insulator B LANGQAO96WRPO Oven lamp socket mounting plate PFPF AOAOWREO Thermal protection sheet LANGQOO255WRWO Capacitor mounting bracket 4 64 LBNDKOO35WRPO Capacitor holder DOOR PARTS CDORFA238WRKO Door assembly FANGTAO5IWRYO Latch plate FLEVFO106WRYO Joint lever LSTPPAO18WRFO Upper latch head LSTPPAO19WRFO Lower latch head MSPRTOOSS9WREO Latch spring HDECQAO75WRFO Door s
58. mperature measurement signal AH sensor signal key strobe signal relay driving signal for oven function and indicator sig nal RD916A1U Power Source Circuit This circuit generates voltages necessary in the control unit 2 Symbol Voltage Application VC 5V LSI IC1 ACL circuit and tem perature measurement circuit VA 16V Buzzzer circuit and 1C2 VS 0 5V 1 2 VP 34V Fluorescent display tube Grid and anode voltage 25 Filament of fluorescent display tube VF2 28V VF1 VF2 voltage RD917A1U 22 3 Synchronizing Signal Circuit The power source synchronizing signal is available in order to compose a basic standard time in the clock circuit It accompanies a very small error because it works on commercial frequency ACL Circuit A circuit to generate a signal which resets the 15 to the initial state when power is supplied RD919A1U RD918A1U 4 Buzzer Circuit The buzzer is responsive to signals from LSI to emit noticing sounds key touch sound and completion sound 5 RD91AA1U 6 Temperature Measurement Circuit Oven temp The temperature in the oven cavity is sensed by the thermistor The variation of resistance according to sensed temperature is detected by the temperature meas urement circuit and the result applied to LSI The result of detecting is given to 51 controlling the relay and display RD91FB1U 7 Absolute Humidity Sensor Circuit The circuit
59. n the cook cycle when the door was opened 7 The monitor switch is electrically monitoring the operation of the upper latch switch and is mechan ically associated with the door so that it will func tion in the following sequence 1 When the door opens from a closed position the upper latch switch and lower latch switch open their contacts and then the monitor switch contacts close 2 When the door is closed from the open posi tion the monitor switch contacts first open and then the contacts of the upper latch switch and lower latch switch close If the common and normal open contacts of upper latch switch fail with their contacts closed when the door is opened the closing of the monitor switch contacts will form a short circuit through the fuse and upper latch switch causing the monitor fuse to blow MED HIGH MED MED LOW DEFROST LOW HOLD COOKING When Variable Cooking Power is programed the 240 volts A C is supplied to the power transformer intermittently through the contacts of relay RY 2 which is operated by the control unit within a 32 sec ond time base Microwave power operation is as fol lows VARI MODE ON TIME OFF TIME HIGH 32 sec sec 10096 power MED HIGH 24 sec 8 sec approx 7096 power MED 18 sec 14 sec approx 5096 power MED LOW DEFROST 12 sec 20 sec approx 3096 power LOW 6 sec 26 sec approx 1096 power HOLD O sec 32 sec 096 power Note The ON OFF time ra
60. oken Insert j mper wire 1 and solder m Pattern at a and b are broken Insert the coil RCILF2003YAZZ between c and d NOTE At the time of these repairs make visual in spection of the varistor for burning damage and examine the transformer with tester for the presence of layer short circuit check primary coil resistance If any abnormal condition is detected replace the defective parts 21 R 8580 TOUCH CONTROL PANEL ASSEMBLY OUTLINE OF TOUCH CONTROL PANEL The touch control section consists of the following units as shown in the touch control panel circuit 1 Relay Unit 2 Key Unit 3 Control Unit The principal functions of these units and the signals communicated among them are explained below RD911A4U Relay Unit Relay unit consists of six relays RY1 RY6 power source circuit and buzzer circuit RD914B1U Key Unit The key unit is composed of a matrix signals generated in the LSI are sent to the key unit through E7 E8 E11 E13and E15 E17 When a key pad is touched a signal is completed through the key unit and passed back to the LSI through ANA AN7 to perform the function that was requested RD913A1U Control Unit Control unit consists of LSI power source circuit synchronizing signal circuit ACL circuit buzzer circuit temperature measurement circuit absolute humidity sensor circuit and indicator circuit RD915B1U 1 LSI This LSI controls the te
61. on of the hot air produced by the convection heater The air heated by the convection heater is circulated through the convection passage provided on the outer casing of the oven cavity by means of the convection fan which is driven by the convection motor It then enters the inside of the oven through the vent holes provided on the left side of the oven Next the hot air heats the food on the turntable and leaves the oven cavity through the vent in the oven cavity left side wall Without leaving the oven this hot air is reheated by the convection heater passes through the convection passage and enters the inside of the oven cavity again in a continuing cycle In this way the hot air circulates inside the oven cavity to raise its temperature and at the same time comes into contact with the food being cooked When the temperature inside the oven cavity reaches the selected temperature the convection heater is de energized When the temperature inside the oven cavity drops below the selected temperature the con vection heater is energized again In this way the in side of the oven cavity is maintained at approximately the selected temperature When the convection time reaches O the convection heater is deenergzed and the convection fan stops op erating and the oven shutts off Upon completion of the cooking time the audible sig nal will sound and oven lamp turntable motor cooling fan motor and convection motor are de energized
62. or opened L level signal PIN NO 43 SIGNAL IN Connected to Vc PIN NO 44 SIGNAL I O IN Reference voltage input terminal A reference voltage applied to the A D converter in the LSI The reference voltage is generally maintained at 5V PIN NO 45 SIGNAL 1 0 IN Reference voltage input terminal A reference voltage applied to the A D converter in the LSI Connectd to GND PIN 46 SIGNAL I O IN Connected to GND PIN NO 47 SIGNAL AN7 I O IN Signal coming from touch key When either one of G 12 line keys on key matrix is touched a corresponding signal out of E7 E8 E11 E13 and E15 E17 will be input into AN7 When no key is touched the signal is held at L level PIN NO SIGNAL AN6 IN Signal coming from touch key When either one of G 11 line keys on key matrix is touched a corresponding signal will be input into AN6 PIN NO RD83CA2U SIGNAL AN5 I O IN Signal coming from touch key When either one of G 10 line keys on key matrix is touched a corresponding signal will be input into AND RD93CA2U PIN NO 50 SIGNAL AN4 IN Signal coming from touch key When either one of G 9 line keys on key matrix is touched a corresponding signal will be input into RD937A1U RD93KA3U RD93GA4U RD93GA5U RD93KA1U RD93CA1U 26 R 8580 PIN NO 51 SIGNAL I O IN Used for initial balancing of the bridge circuit absolute humidity sensor This input is an
63. ormal voltage due to static electricity etc is not applied to the input or output termi nals 4 Attach connectors electrolytic capacitors etc to PWB taking care that all connections are tight 5 Be sure to use specified components where high precision is required RD94ZA2U R 8580 COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE WARNING To avoid possible exposure to microwave 4 There is any defective parts in the interlock energy oven door or microwave generating and trans A Before operating the oven mission assembly 1 Make sure that unlatching the door slowly is 5 There is any other visible damage to the oven accompanied by a click indicating actuation of C Do not operate the oven the monitor switch and latch switches 1 Without the RF aasket 2 Check visually the door seal for arcing and gt it the deo j damage T CAUTION DISCONNECT OVEN FROM POWER B D t te th til aft f f A S SUPPLY BEFORE REMOVING the following conditions exist 1 Door does not close firmly against the front of OUTER CASE DISCHARGE HIGH appliance VOLTAGE CAPACITOR BEFORE 2 There is a broken door hinge or support TOUCHING ANY OVEN COMPO 3 The door is bent or warped e NENTS OR WIRING RDA1203U POWER TRANSFORMER REMOVAL 1 Disconnect oven from power supply and remove 3 Make sure the transformer is mounted correctly outer case to corners underneath those tabs 2 Discharge high voltage capacitor 4 After re in
64. output power should be calculated as follows In case the measuring result is not satis factory execute the measurement several times and judge the result from the synthetic point of view Microwave output power should be within 15 of the nominal one Calculation of output power Microwave output power P W 70 x AT C AT ATR 2 average temperature rise ATL TL2 TL1 ATR TR2 TL2 water temperature after heating in left beaker TL1 water temperature before heating in left beaker TR2 water temperature after heating in right beaker TR1 water temperature before heating in right beaker Measuring condition As the microwave output is affected by several conditions the measurement should be made carefully with following attentions 1 Initial temperature of salt water should be 10 1 C Well and quickly stir the water and the temperature measurement should be done immediately after heating 2 The graduation of thermometer should be scaled by 0 1 C at minimum and an accurate mer cury thermometer is recommended 14 R 8580 TEST PROCEDURES CONT D 8 PROCEDURE LETTER COMPONENT TEST 3 Water container should be one 1 litre beaker made of Pyrex glass and its diameter approxi mately 12 cm 4 Room temperature should be around 20 C 5 Power supply voltage should be specification voltage B POWER TRANSFORMER TEST DISCHARGE THE
65. pacitor 22 pF 25V RC EZAO60DREO Capacitor RC KZ104QDREO Capacitor RC EZAO63DREO Capacitor uF l AB RC EZA062DREO0 Capacitor 3 3 pF 50V 1 AB RCRS A003DREO Ceramic filter 4 0MHZ 1 AF RH DZAO29DREO Diode 1N4002 8 AA RH DZAO24DREOI Diode US1060M LSI IC IR94558 Transistor 2SB793 OQ R Transistor DTA143ES RH IZA096DREO RH IZ0021WREO RH TZA035DREO0 RH TZAOA6DREO Transistor 2SA933S Transistor DTA114Y Transistor DTD143A Resistor 330 Resistor Resistor 560 Q 1 2W Resistor 10k Q 1 4W RH TZA044DREO RH TZA047DREO RH TZAO51DREO RR DZ331NDREO RR SZ820RDREO RR DZ561PDREO RR DZ103NDREO pp QU LLL Resistor Resistor Resistor 470 Q 1 4W RR DZAO69DREO Resistor block RNAF9T RR DZ331PDREO Resistor 330 Q 1 2W RR NZ182NDREO Resistor 1 8k O F 1 4W RR NZ3OANDREO Resistor 300k 1 4W RR NZ151NDREO Resistor 1 4 RR DZ102NDREO Resistor 1 0k Q 1 4W RR DZ473NDREO RR DZ153NDREO RR DZ471NDREO 1 13 D D lt OQ F RR NZ362NDREO Resistor 1 4W RR DZ184NDREO Resistor RR DZ273NDREO Resistor 27k Q 1 4W RR DZAO52DREO Resistor block 100k RR DZAO27DREO Resistor block 27k RR DZAO3ODREO Resistor block 56k 9x15 RH EZAO50DREO Zener diode RD16EB3 RH EZAO5IDREO Zener diode RD5 1EB3 RH EZAO52DREO Zener
66. power supply from the oven proper CAUTION THE HIGH VOLTAGE TRANSFORMER OF THE MICROWAVE OVEN IS STILL ALIVE TO GIVE YOU DANGER DURING SER VICING Therefore when checking the performance of the touch control panel put the outer cabinet on the oven proper to keep from touching the high voltage transformer or unplug the primary terminal connector of the high voltage trans former to turn it off and the end of such con nector shall be insulated with an insulating tape After servicing be sure to replace the leads to their original locations A On some models the power supply cord be tween the touch control panel and the oven proper is so short that they can t be separated from each other 29 For those models therefore check and repair all the controls with the sensor related ones included of the touch control panel while keeping it in contact with the oven proper B On some models on the other hand the power supply cord between the touch control panel and the oven proper is so long that they may be separated from each other For those mod els therefore it is allowed to check and repair the controls of the touch control panel while keeping it apart from the oven proper in this case you must short both ends of the door sensing switch on PWB of the touch control panel with a jumper which brings about an operational state that is equivalent to that with the oven door being closed As to the sensor related controls
67. relay RY6 is energized turning on the damper motor The damper is returned to the open position closing the damper switch contacts which send a signal to the control unit de energizing shut off relay RY6 AUTOMATIC MIX COOKING CONDITION Program desired cooking time and temperature by touching the number pads and the LOW MIX BAKE or HIGH MIX ROAST pad When the START pad is touched the following oper ations occur 1 The numbers of the digital readout start the count down to zero 2 The shut off relay RY2 RY3 and RY5 are ener gized turning on the oven lamp turntable motor and cooling fan motor The shut off relay RY6 is energized The damper door is closed from the open position The heater relay RY4 is energized adding the mains supply voltage to the convection heater Now the oven is in the convection cooking con dition When the oven temperature reaches the selected temperature the following operations occur 6 1 The power supply voltages is added to the convection heater and power transformer al ternately 6 2 The convection heater operates through the heater relay RY4 contacts and the power transformer operates through the cook relay RY1 contacts 6 3 These are operated by the CPU unit to sup ply alternately within a 32 second time base convection heat and microwave energy QU The relationship between convection and micro wave power operations are as follows
68. ring and repair harness Procedure F Procedure 1 Replace or repair wiring Procedure O Procedure E Check wall outlet ing Check wiring Defective oven lamp Defective upper latch switch Blow fuse Defective thermal cut out Defective magnetron temp fuse Open or loose wire connection to the above components R 8580 PROBLEM POSSIBLE CAUSE TEST PROCEDURE OR CORRECTION COOKING CONDITION Oven lamp does not light in cook Defective shut off relay RY2 on relay Procedure N cycle unit Does light when door is opened Defective CPU unit Procedure O Oven lamp does not light at all Burned out bulb Open wiring of oven lamp Check and repair wiring Oven lamp lights but turntable Open or loose wiring to turntable motor Check and repair wiring motor does not operate Defective turntable motor Turntable motor operates normally Defective cooling fan motor Repace but cooling fan motor does not Defective shut off relay on relay unit operate Open or loose wiring to fan motor Check and repair wiring MICROWAVE Oven does not go into a cook cy cle when START pad is touched Upper latch switch and or lower latch Procedure E switch defective or out adjustment Defective cook relay RY1 on relay unit Defective CPU unit Defective key unit Open or loose wiring to above compo Check and repair wiring nents
69. s E 3 and E 4 20 C 30 C Approx 3500 155 If the meter does not indicate above resistance replace the thermistor L DAMPER MOTOR TEST When the power cord is plugged into the wall receptacle and 240 volts A C is supplied to the damper motor the motor operates until the damper is opened and the damper switch closes Then the damper motor stops operation If the damper motor does not operate check for input voltage by A C volt meter at the motor 1 Disconnect the power cord from the wall receptacle 2 Disconnect the wire leads of motor and connect the meter leads to the wire leads of main wire harness 3 Reconnect the power cord into the wall receptacle If 240 volts A C is indicated at the wire leads replace the motor Not indicated check the wire harness and the relay unit RD82b01U M DAMPER SWITCH TEST Disconnect the wire leads from the switch terminals and connect ohmmeter leads to the common COM and normally open NO terminals of the switch 1 When switch actuator is pushed by the damper motor cam the meter should indicate a closed Circuit 2 When the power cord is plugged into the wall receptacle the damper motor operates and damper cam starts to rotate The switch actuator is released the meter should indicate an open circuit If improper operation is indicated replace the damper switch T n H ep t
70. stalling the transformer secure the 3 Disconnect filament leads of transformer from the transformer with two screws to the cabinet base Ma abt one is with outertooth washer and the other is Disconnect wire leads from the transformer 5 Remove two 2 screws and one 1 washer hold 5 s FEM ing the transformer to the cabinet base Re connect the wire leads primary and hig Re install voltage to the transformer and filament leads of 1 Rest the transformer on the base cabinet with its transformer to the magnetron referring to the primary terminals toward rear cabinet Pictorial Diagram 2 Insert the two edges of the transformer into two 6 Re install the outer case and check that the oven metal tabs of the base cabinet Is operating properly HIGH VOLTAGE RECTIFIER REMOVAL 1 Disconnect oven from power suppply and remove CAUTION WHEN REPLACING THE SILICON outer case RECTIFIER THE GROUND SIDE 2 Discharge the high voltage capacitor TERMINAL MUST BE SECURED 3 Remove one 1 screw holding the rectifier to the FIRMLY WITH A GROUNDING capacitor holder SCREW 4 Disconnect the rectifier from the capacitor HIGH VOLTAGE CAPACITOR REMOVAL 1 Disconnect oven from power supply and remove 5 Disconnect rectifier and high voltage rectifier from 2 Dicha ih high voltage capacito i Discharge the high volta pacitor 3 Disconnect the high voltage wire leads from high 6 0 dd
71. strobe siqnal Signal applied to touch key section A pulse signal is input to AN4 AN7 terminal while one of G 1 line keys on key matrix is touched PINNO s wo OT Segment data signal Signal similar to E6 Key strobe signal Signal applied to touch key section A pulse signal is input to ANA AN7 terminal while one of G 2 line keys on key matrix is touched RD939A3U PIN NO 10 11 SIGNAL 9 10 OUT Segment data signal Signal similar to E6 RD939A2U PIN NO SIGNAL Seg gnal egment data signal Signal similar to E6 Key strobe signal Signal applied to touch key section A pulse signal is input to AN4 AN7 terminal while one of G 3 line keys on key matrix is touched PIN NO SIGNAL Jo Segment data signal oignal similar to E6 Key strobe signal Signal applied to touch key section A pulse signal is input to AN4 AN7 terminal while one of G 4 line keys on key matrix is touched PINNO 14 SIGNAL Jo out Segment data signal Signal similar to E6 Key strobe signal Signal applied to touch key section A pulse signal is input to AN4 AN7 terminal while one of G 5 line keys on key matrix is touched RD939A3U RD939A3U RD939A3U RD939A3U 23 R 8580 Segment data signal Signal similar to E6 PIN NO SIGNAL E16 Segment signal Signal similar to Key strobe signal Signal applied to touch key sect
72. tio does not correspond with the percentage of microwave power be cause approx 2 seconds are needed for heating of the magnetron filament RD71401U CONVECTION COOKING CONDITION PREHEATING CONDITION Program desired convection temperature by touching the CONVECTION pad and the temp pad When the START pad is touched the following oper ations occur 1 The coil of shut off relays RY2 RY3 and RY5 are energized the oven lamp cooling fan motor turntable motor and convection motor are turned on 2 The coil of relay RY6 is energized by the CPU unit The damper is moved to the closed position opening the damper switch contacts The opening of the damper switch contacts sends a signal to the LSI on the CPU unit de energizing the relay RY6 and opening the circuit to the damper motor 3 The coil of heater relay RY4 is energized by the CPU unit and the main supply voltage is added to the convection heater 4 When the oven temperature reaches the selected preheat temperature the following operations oc 4 1 The heater relay RY4 is de energized by the CPU unit temperature circuit and thermistor opening the circuit to the con vection heater 4 2 The oven will continue to function for 15 minutes turning the convection heater on and off as needed to maintain the selected preheat temperature The oven will shut down completely after 15 minutes CONVECTION COOKING CONDITION When the preheat t
73. tion the one is probably defective and should be replaced D HIGH VOLTAGE CAPACITOR TEST DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPO NENTS OR WIRING If the capacitor is open no high voltage will be available to the magnetron Disconnect input leads and check for short or open between the terminals using an ohmmeter Checking with a high ohm scale if the high voltage capacitor is normal the meter will indicate continuity for a short time and should indicate approximately 10M Q once the capacitor is charged If the above is not the case check the capacitor with an ohmmeter to see if it is shorted between the terminals If it is shorted replace the capacitor RD82603U E SWITCH TEST Isolate the switch and check the contacts by using an ohmmeter using the following table If improper operation is indicated make the necessary switch adjustment or replacement Common Terminal Normally Open Terminal Common Normally Close Terminal Connection inal i COM NO COM NC Operation Plunger pushed Table Switch Connection RD82701U 15 R 8580 TEST PROCEDURES CONT D PROCEDURE LETTER COMPONENT TEST F MONITOR SWITCH TEST Before performing this test disconnect oven from power supply and make sure that the upper latch switch is operating properly referring to the above Switch Test Procedure Disconnect the wire lead from the monitor switch NC terminal Chec
74. tube should not hit by any metal object around the tube 7 Remove one 1 screw holding cooling duct B to the magnetron 8 Remove cooling duct B from the magnetron 9 Now the magnetron is free CAUTION WHEN REPLACING THE MAGNETRON BE SURE THE R F GASKET IS IN PLACE AND THE MAGNETRON MOUNTING SCREWS ARE TIGHTENED SECURELY CONVECTION MOTOR REMOVAL Disconnect oven from power supply and remove outer case Disharge the high voltage capacitor Remove sliding the thermal cut out with its wire lead on Disconnect wire leads from the convection motor and convection heater Disconnect the 2 pin connector from thermistor Remove eleven 11 screws holding the heater duct to the oven cavity Remove two 2 screws holding the heater duct to thermal protection plate bottom The heater unit is now free Remove the four 4 screws holding the thermal protection plate left to the heater duct 10 The thermal protection plate left and sheet left are now free 11 Remove three 3 screws holding the convection motor mounting plate to the heater duct 12 Pull the convection motor shaft out of convection fan 13 Now the convection motor with the motor mount ing plate is free OO P COOLING FAN 1 Disconnect oven from power supply and remove outer case Discharge the high voltage capacitor Disconnect wire leads from the cooling fan motor Release AH sensor harness from
75. ture rise test This test should only be used if above rests do not indicate a faulty magnetron and there is no defect in the following components or wiring high voltage rectifier rectifier high voltage capacitor and power transformer MICROWAVE OUTPUT POWER Microwave output power from the magnetron can be measured by way of substitution i e it can be measured by using water load how much it can be absorbed by the water load To measure the microwave output power in the microwave oven the relation of calorie and watt is used When P W heating works for t second approximately P x t 4 2 calorie is generated On the other hand if the temperature of the water with V ml rises AT C during this microwave heating period the calorie of the water is V x AT The formular is as follows 4 2 P 42 AT t Our condition for the water load is follows Water load 2000 ml Heating time 120 seconds P 70x AT Measuring method 1 Put the water load of two 2 litres on the center of the oven shelf The water load should be arranged in two 2 Pyrex beakers the size of which is one 1 litre and be placed at right and left side by side on the oven shelf 2 Measure the temperature of water before heating and also after heating during 120 seconds by microwave and calculate the temperature rise The temperature rise should be the average of temperature differences measured in each beaker 3 The

Sharp r-8580 Microwave Oven User Manual

Contents

Download Pdf Manuals

Related Search

Related Contents