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R-8470
R-8570

MAGNETRON ASSEMBLY REMOVAL

Disconnect oven from power supply and remove

6. Lower the magnetron assembly until the tube is

outer case.

clear of the waveguide.

2. Discharge the high voltage capacitor.

7. Remove single (1) screw holding the cooling duct

3. Disconnect wire leads from the magnetron

(B) to the magnetron assembly.

bly.

8. Remove the cooling duct (B) from the magnetron.

4. Release the tab which is provided on cooling duct

CAUTION:

WHEN REPLACING THE MAGNETRON,

(B) to hold cooling duct (A).

BE SURE THE R.F. GASKET IS IN

5. Carefully remove four (4) mounting screws holding

PLACE

AND

THE

MAGNETRON

the magnetron assembly to waveguide while

MOUNTING SCREWS ARE TIGHTENED

porting the magnetron assembly from below.

SECURELY.

CONVECTION MOTOR REMOVAL

1. Disconnect oven from power supply and remove

outer case.

2. Disharge the high voltage capacitor.
3. Disconnect wire leads from the convection motor.
4. Remove two (2) screw holding the convection

motor assembly to the chassis support and
waveguide flange.

The convection motor assembly is now free.

7. Remove the two (2) screw and nuts holding the

mounting bracket to the motor

8. Remove the pin and pulley (B) from the motor

shaft.

5. Remove the convection fan belt.
6. Lift up the convection motor assembly and remove

it from the unit.

9. The convection motor is now free.

Note: The motor mounting plate with the convection

motor should be installed in close contact with
the waveguide flange. Otherwise, the revolution
of the convection fan belt may be disrupted.

COOLING FAN MOTOR REMOVAL

1. Disconnect oven from power supply and remove

outer case.

7. Remove the duct (A) with the cooling fan motor

attached from the unit.

2. Discharge the high voltage capacitor.
3. Disconnect wire leads from the cooling fan motor.
4. Remove screw holding the grounding wire to the

oven cavity flange.

5. Remove four (4) screw holding the chassis support

to rear cabinet, cooling duct (A), convection motor

mounting plate and control panel back plate.

6. Release the tab which is provided on

(B) to hold the cooling duct (A).

cooling duct

The cooling fan motor assembly is now free.

8. Remove the fan blade from the cooling fan motor

shaft by pulling the fan retainer clip.

9. Remove two (2) screws and nuts holding the

cooling fan motor and grounding wire to the cool-

ing duct (A).

The cooling fan motor is now free.

1. Disconnect oven from power supply

outer case.

and remove

2. Discharge the high voltage capacitor.
3 . R e m o v e t h e m a g n e t r o n a s s e m b l y , r e f e r t o

“Magnetron Assembly Removal”.

4. Disconnect two (2) connectors for the damper

motor from the relay unit.

5. Disconnect two (2) connectors for the stop switch

from the relay unit.

DAPMER ASSEMBLY

6. Remove two (2) screw holding the damper duct to

oven cavity right-side.

7. Remove single (1) screw holding the damper duct

to rear cabinet.

8. Remove two (2) screws holding the damper duct

to top of the oven cavity.

9. Remove the damper assembly from the unit.

Содержание R-8470

Страница 1: ...TS Page FOREWORD 1 CAUTION MICROWAVE RADIATION 1 PRODUCT DESCRIPTION 2 OPERATION INSTRUCTIONS 3 OPERATION I 4 SERVICING 10 TOUCH CONTORL PANEL ASSEMBLY 20 COMPORNENT REPLACEMENT AND ADJUSTMENT PROCEDURE 29 MICROWAVE MEASUREMENT PROCEDURE 34 PACKING AND ACCESSORIES 35 PICTORIAL DIAGRAM 36 CONTROL PANEL CIRCUIT R 8470 37 CONTROL PANEL CIRCUIT R 8570 39 PRINTED WIRING BOARD 41 PARTS LIST 42 SERVICE I...

Страница 2: ...I R 8470 R 8570 R 8470 R 8570 ...

Страница 3: ...e given to avoid electrical shock and microwave radiation hazard 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 nicrowave ene...

Страница 4: ...wever cooking by microwave energy only produces no browning or searing unless cooking a roast of sufficient thickness This microwave oven is therefore equipped with a sheath heater to provide browning of the food The combination of the heater plus high speed circu lation of air by a circulating fan around the food pro vides fast cooking and browning of foods conventionally with or without the addi...

Страница 5: ...oking time cooking instruction or time of day INDICATORS CONYECTlON not _ A _ LOW MIX T L ye 7 IYGHAS SL35 ym GRlli A SLOW COOK 5 mot A ow lyiiz MEDLOW I E of ml __ Med aare 17 E 1 8 22x t Lki l Te E i 9 i y 0W s I 0 25592 iMEP 1 AT STAR I HOLD CLOCK CONVECTION COOKING FUNCTION PADS Touch to cook with each function SENSOR COOK PAD Touch to select Sensor Cook settings COMPU COoKTM PAD Touch to sele...

Страница 6: ...neled through the waveguide into the cavity feed box and then into the cavity where the food is placed to be cooked 5 6 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 When the door is opened during a cook cycle monitor switch stop switch upper latch switch are activat...

Страница 7: ...tor circuit to continue operation of the cooling fan motor until the temperature drops below 100 OC at which time the relay will be de energized turn ing off the fan motor Relay RY3 will however open as soon sa the convection cycle has ended turning off the convection fan motor This will now cool and allow the damper door to open At the end of the convection cook cycle shut off relay RY6 is energi...

Страница 8: ...emaining 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 offrelay and cook relay are de energized and the power transformer oven light 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...

Страница 9: ...IF E 4j ZI i 0 T z 211 i Il z L p 2 5 oooo i O I Q E z so o pq G Wok 3 gyzyp Z 5 5 y Z gpP otwvJt z o 2X Lu JQ 5 oLL QaOL u4ak w OOCCYU a I Lip ggz OVL Uv z N 0 s 5 a 1 L s cu 0 5 4 2 a 0 Y iy 25 m _ 8 k z g i 2 6 5 IC Via C 0 0 5 E 0 2 e a G ao r iiF Eye 66 vi 6 7 m IA 0 c c 00 c J F G E 0 I g E EY 4 50 v L 0 Eg Yi hi 6 2 3 m IA E w z s t 0 I 0 c E z ci E 6 6 E L 7 ...

Страница 10: ...inversely 3 In the door is opened and the upper latch switch contacts fail to open the fuse blows simultaneously with the closing of the monitor switch contacts CAUTION BEFORE REPLACING A BLOWN FUSE TEST THE MONITOR SWITCH UPPER LATCH SWITCH FOR PROPER OPERA TION REFER TO CHAPTER TEST PRO CEDURE DOOR OPEN MECHANISM The door can be opened by grasping the door handle and pulling strong When the door...

Страница 11: ... a sig nal is sensed in the control unit and operates the shut off relay RY6 Contacts of shut off relay RY6 close then the damper motor is energized opening the damper door When damper is moved to the open position by the damper cam damper 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 m...

Страница 12: ...ord is plugged into wall recepta ness and repair harness I de Defective monitor switch Procedure F 88 88 do not appear in display No power at outlet Check home fuse when power cord is first plugged Blown monitor fuse Psocedure G into wall outlet Blown magnetron temp fuse Psocedure H Open wire in power cord wiring harness Replace or repair wiring or wiring between control panel assembly units Defec...

Страница 13: ...o 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 Oven does not cook properly when programed in COMPU DE FROST cooking mode Upper and or lower latch switches defec Procedure E tive or out of adjustment Defective cook relay RYI on relay unit Procedure J Defective control unit P...

Страница 14: ...oose wire connection to the Check and repair wiring above components Temperature in the oven cavity is Defective heating element Procedure I 1 lower or higher than preset Defective control unit Porcedure K Defective convection mortor Replace motor Defective thermistor Procedure N Defective cooling fan motor Replace Defective dumper motor Procedure 0 Defective drive mechanism of convection Check I ...

Страница 15: ...V x AT t Our condition for the water load is as follows Water load 2000 ml Heating time I20 seconds 2 minutes P 7Ox A T 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...

Страница 16: ...O 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 an open circuit once the capacitor is charged If the above is not the ca...

Страница 17: ...A continuity check across the temp fuse terminal should indicate a closed circuit If the temperature of the magnetron reaches 115 OC thne temp fuse opens If the temp fuse has opened replace the fuse An open temp fuse indicates overheating of the magnetron assembly Check for restricted air flow to the magnetron through the opening in the chassis especially the cooling duct I HEATING ELEMENT TEST Ma...

Страница 18: ...anel 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 un it 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 ...

Страница 19: ...xample chicken pieces would be at refrigerator temperature and canned soup at room temperature 7 Foods weighing less than 3 ounces should be cooked by time and vaiper power 8 Avoid using aerosol sprays or cleaning solvents near the oven while using Sensor settings The sensor will detect the vapor given of by the spray and turn off befor food is propary cooked 9 After 30 minutes it the sensor has n...

Страница 20: ...ads to Pin No s E l and E 2 Room Temp Resistance 68 F 20 C 86 F 30 C 1 Approx 350 f2 155k n If the meter does not indicate above resistance replace the thermistor 0 DAMPER MOTOR TEST When the power cord is plugged into the wall receptacle the 240 volts A C is supplied to the damper motor and the motor operates until the damper is opened and the damper switch closes Then the damper motor stops oper...

Страница 21: ...oximately 5 minutes after the preheat temperature is reached audible signal sounds four times The temperature experienced may be approximately 20 C more or less than indicated on the display however in most cases the food cooking results will be satisfactory Difference in power supply voltage will also affect the oven temperature The household power supply voltage may sometimes become lower than t...

Страница 22: ...2 R 8570 only 34v Fluorescent display tube Grid and anode voltage VFI 25V Filament of fluorescent display tube VF2 28V VFI VF2 voltage 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 Cirucit to generate signals resetti...

Страница 23: ...R 8470 R 8570 1 I 2 3 4 5 6 1 2 Figure T l Block Daigram 3 4 5 I I 6 21 ...

Страница 24: ...ey matrix is touched PIN NO 9 Segment data sianal Signal similar to E6 1 SIGNAL E8 I I O j O U T Kev strobe siqnal R 8570 onlv 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 j IO 11 Segment data siqnal Signal similar to E6 S I G N A L E9 ElO I I O j OUT PIN NO 12 1 S I G N A L El1 I I I O j OUT Segment data...

Страница 25: ... line keys on key matrix is touched PIN NO 19 20 1 S I G N A L 1 El8 E19 I l O 1 OUT Seqment data siqnal Signal similar to E6 PIN NO 21 24 1 SIGNAL E20 E23 I I O 1 OUT R 8470 Terminal not used Connected to GND R 8570 Used for initial balancing of the bridge circuit absolute himidity sensor PIN NO 25 1 SIGNAL 1 EX I I O 1 IN Internal clock oscillation frequency settinq input The internal clock freq...

Страница 26: ...ooking 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 NO j 34 1 SIGNAL 1 RI I I O OUT Oven lamp and turntable motor driving signal Sauare Waveform 50Hz To turn on and off the control relay The pulse signai 50Hz is delivered to the control relay driving circuit and cook relay and he...

Страница 27: ...verter in the LSI The reference voltage is generally maintained at 5V I I O 1 IN PIN NO 45 1 SIGNAL AVR I I O IN Reference voltage input terminal A reference voltage applied to the A D converter in the LSI Connectd to GND PIN NO 1 46 Connected to GND 1 SIGNAL j AVcc I I O IN PIN NO 47 1 SIGNAL A N 7 I l O IN Signal coming from touch key When either one of G l 3 line keys on key matrix is touched a...

Страница 28: ...L j A N 1 I I O j 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 PIN NO 1 54 1 SIGNAL 1 AN0 I I O IN Terminal not used Connected to GND PIN NO 55 1 SIGNAL R8 Terminal not used Connected to VC I I O j OUT PIN NO 5 6 6 0 Terminal not u...

Страница 29: ... 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 such a way as to change the resistance values in parallel with R50 1 Changing the resistance values results in that the...

Страница 30: ...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 stop switch on PWB of the touch control panel with ...

Страница 31: ...ling the transformer secure the transformer with two screws to the cabinet base one is with outertooth washer and the other is without outer tooth washer Re connect the wire leads primary and high voltage to the transformer and filament leads of transformer to the magnetron referring to the Pictorial Diagram Re install the outer case and check that the oven is operating properly SILICON RECTIFIER ...

Страница 32: ...te with the convection motor should be installed in close contact with the waveguide flange Otherwise the revolution of the convection fan belt may be disrupted COOLING FAN MOTOR REMOVAL 1 Disconnect oven from power supply and remove outer case 7 Remove the duct A with the cooling fan motor attached from the unit 2 Discharge the high voltage capacitor 3 Disconnect wire leads from the cooling fan m...

Страница 33: ...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 Disconnect a connector from the control unit Remove single 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 single 1 screw holdin...

Страница 34: ...ure the screws with washers firmly 4 Now make sure of the upper latch switch opera tion If the upper 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 points 1 The in and out play of the door remains less than 0 5 mm at latche...

Страница 35: ...oor 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 primary and secondary interlock switches adjustment 2 Deviation of the door alignment from the horizontal line of cavity face to be less than IOmm 3 Door should be adjusted with its face depress...

Страница 36: ...he per formance standard for microwave ovens must be used for testing Recommended instruments are NARDA 8100 NARDA 8200 HOLDADYA HI 1500 SIMPSON 3800M 2 Place the turntabel tray into the oven cavity 3 Place the load of 275 fl5ml of water initially at 20 5 C in the centre of the oven tray The water container should be a low form of 600 ml beaker with inside diameter of approx 8 5cm and made of an e...

Страница 37: ...R 8470 R 8570 1 2 3 4 5 6 PACKING AND ACCESSORIES TRAY PACKING FOAM s SPADP0328WREO N o t Replaceble Items c C D E 35 ...

Страница 38: ...GL CN I 101 I 3 618 N A CN BI lCN ii 1 COOLING FANMOTOR 3 p W Ii I R 857 u rAt C I I I c CONTROL PANEL ASS Y TO 3PIN CONNECTOR CN F THERMISTOR HEATING ELEMENT i ION ZP N CONNECTOR Al 1L _ o __ bin __ _ _ _ _ _ _ __ _ _ ___ r T 0 0 W D m ...

Страница 39: ... I VI TURNTABLE MOTOR OVEN LAMP r4 yB 4 IDT FAN MOTOR A 9 dc aC A 7 i A 5 fN CTlON DAMPER MOTOR DTA143 A x5 IF NOT SPECIFIED 1 4W 5 j I F NOT SPECIFIED 0 015 25V IF NOT SPECIFIED US1060 I t R76 l k R71 lk f R66 l k fvc t R65 130 F C65 l 7 DAMPER STOP SWITCH SWITCH DOOR SWITCH TERMISTER Figure S 2 Contorol Panel Circuit Mot 1 I 2 I 3 4 I 5 6 I 7 37 ...

Страница 40: ... 8570 R66 l k f R65 G 130 F C65 T 1 KEY UNIT 1 I 1 10k t j t jR99 fR96 R 9 7 R96 R95 fR94 fR9l r F U OS ln0V l C C c B 1 7 8 I 9 10 11 12 l A C VP 9 D E OVEN TERMISTER Ii I Panel Circuit Model R 8470 I 7 8 I 9 I 10 11 12 38 ...

Страница 41: ...POWER TRANSFORMER IIf AKt HEATING ELEMENT FAN MOT01 c IUU CTION DAMPER MOTOF 5 DTA143 A x I F N O T SPECIFIED 1 4W 5 4 b IF NOT SPECIFIED 0 015 25V IF NOT SPECIFIED US1060 I J I I I R76 l k R75 27k i iI R52 i BkF KfT STOP OVEN THERMISTOR DO TC Figure S 3 I 1 I 2 1 3 4 5 39 ...

Страница 42: ...8470 R 8570 7 8 9 10 11 I 12 I 1 NAL VP 2 D91 10k xt H I G H MEDHIGH AUTO s im S T O P I N S T A N T T I M E R START HOLD DEFROST KEY UNIT I AH SENSOR 11 Panel Circuit Model R 8570 I 7 8 I 9 10 I 11 12 40 ...

Страница 43: ... lOlOl K E I ggzr z Y7 O Rmo f f Ll Lx I 71 I r J ggo g pa3 g f 1 II I 1 fi g j iti E 0 ec g kn L 0 0 I e 4 I gj zm 52 1 i yfycJ 3 I a Ad 53 g a g a Fz i Li _ z 4 I 3 I mR r IIAFI _ I 0184 n Control Unit Figure S 4 Printed Wiring Board Relay Unit rl B C D E F G H I 1 II 2 3 4 5 6 I 41 ...

Страница 44: ...8570 LBNDK0035WRPO Capacitor holder PCUSU0242YBPO Cushion LHLDK0005YBFO Cord holder GCABUAO56WRPO Outer case cabinet PCUSUOl 12YBPO Shading cushion A LANGQ0255WRWO Capacitor mounting bracket PSPAGQ002YBEO Vibration proof cushion P C A S 0017WRFO Plug case LANGQ0225WRWO Cord mounting bracket LBSHC0032WREO Cord bushing LSTPP0009YBFO Cord anchorage lower LSTPP0008YBFO Cord anchorage upper CONTROL PAN...

Страница 45: ... R E O R R DZl 5 1 P D R E O R R DZl 2 1 P D R E O R R D Z 2 7 1 P D R E O R R DZ473DDREO AC A A A A A A A A A A R R DZ473DDREO Transistor 2SB91 OMR Resistor 3 3 0 n Resistor 150 n Resistor 120n Resistor 270 n Resistor 47k n Resistor 47k n Resistor 15kn Resistor 4 7 0 c2 Resistor block RNAFST Resistor 330 n Resistor IOkn 1 4w 1 2w lj2W 1 2w 1 4W R 8470 1 4W R 8570 A A R R DZl 5 3 D D R E C I 1 l4W...

Страница 46: ...2WRWO FFANMA002WRYO NBLTKAOO5WREO NPLYBOO3OWRFO Relay unit 12 pin connector A pin wire connector 0 13 pin wire connector C 8 pin connector I Fuse holder Capacitor 0 1 PF Capacitor 1000 FF Capacitor 0 1 PF Capacitor 10 FF Diode 11 El Diode US1 060 5 o v 3 5 v 25V 5 o v Fuse Filter coil 22 PH Transistor 2SA937Q Resistor 18kn Resistor 10kn Resistor 150k n Resistor 470 n Relay D C 14V Buzzer Varistor ...

Страница 47: ...pper 1 LANGTAO48WRWO Sash mounting plate lower 1 F H N G 0078WREO Door hinge ass y 1 HDECQA028WRFO Door sash left 1 PGLSPAO45WREO Door glass R 8470 1 PGLSPAO46WREO Door glass R 8570 1 P C U S G 0 2 1 3 W R P 0 Door sushion short 2 P C U S G 0 2 1 2 W R P 0 Door cushion long 2 PSLDMAO38WREO Door ferrite upper 2 L X CZAOl 7 W R E 0 Screw sash mounting plate mtg 6 L X CZOO26WREO Screw door hinge ass ...

Страница 48: ...ght left upper thermal 21 AA protection plate right left thermal protection cover oven lamp mounting plate sensor cover and air guide duct mtg X C P S D4 0 P 2 7 0 0 0 Screw cord anchorage upper mtg 2 A A XCPWW3OPl o x u o Screw heating element holder and heating element insulator mtg 4 AA XCTSD40P08000 Screw convection motor mounting plate and damper duct mtg 4 AA XCTSD40Pl 0 0 0 0 Screw cord anc...

Страница 49: ...1 4 3 A l R H T Z A 0 2 5 D R E O VS2SC2021 f 1 A R H T Z A 0 2 1 D R E O VS2SB851 R 1 REF NO RI R2 RS R4 R22 etc R23 eic R 3 0 R 5 5 e c R66 e c R70 etc R83 R 8 4 R113 R 2 0 0 R 2 0 4 LISTED PART NO USED PART NO R 1 DZ331 N D R E O L R D ST2EF331 J R R DZl 5 1 P D R E O S D ST2HAl 5 1 J R R DZl 2 1 P D R E O x R D S72HAl 2 1 J RR D Z 2 7 7 P D R E O RD ST2HA271 J R R DZ473DDREO RD ST2EF473J R R D...

Страница 50: ...R 8470 R 8570 1 2 3 j 4 5 6 I CABINET PARTS I 1 I 1 I 2 I 3 I 4 I I 5 6 48 ...

Страница 51: ...R 8470 R 8570 1 2 3 4 5 6 I i E I I 1 2 49 ...

Страница 52: ...R 8470 R 8570 1 2 I 3 4 5 6 1 I 1 I 2 3 4 5 I 6 50 ...

Страница 53: ...R 8470 R 8570 1 2 I 3 I 4 5 6 DOOR ASSEMBLY MISCELLANEOUS 6 3 Trans m I I I I I I i I t ...

Страница 54: ...refore it must be fixed correctly and firmly 1 The cord anchorage which is used to secure the mains supply cord can be fixed in two different ways 2 If you fix them s shown in Figure 2 the mains supply cord will not be secured firmly 3 Therefore make sure to fix them as shown in figure 1 LSTFFOOO8Y BFO SUPPLY CDRD ANCHORAGE WPPER LBTPPWlO8YBFO Figure 1 Correct Fixing Figure 2 Wrong Fixing 3 m m 86...

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