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SERVICE MANUAL - Page de test

1. NYS aa SN HOLIMS 4015 SMS M18 ouo ON M18 epis HOLIMS HOLV ANZ ZMS IHM 1 N 1HM 3 HOLINOW epis 19 1429 HOLIMS 151 LMS ravi TOYLNOD HONOL MIA HOLON H3HHILS WS HOLSINHIHL 15 M18 940 TYNHYIHL N3AO 19021 HOLIMS HOLINON VMS WOO LHM 33 R 2397 0105 Z S 4 HOLSINHIHL HOLSIAH3HL HOLIMS HOOG 7 HOLSINHIHL 1100 031310395 LON 31 Hu
2. T2 21 Temperature difference Cold Warm AT 10 Measured output power The equation is P 170 x AT P 170 x 10 1700 Watts JUDGMENT The measured output power should be at least 15 96 of the rated output power CAUTION 1 C CORRESPONDS TO 170 WATTS REPEAT MEASUREMENT IF THE POWER 15 INSUFFICIENT 1000g 10009 1000g m 7 __ T2 C Heat up for 28 sec HIGH VOLTAGE TRANSFORMER TEST WARNING High voltages and large currents are present at the secondary winding and filament winding of high voltage transformer It is very dangerous to work near this part when the oven is on NEVER make any voltage measurements of the high voltage circuits including the magnetron filament CARRY OUT 3D CHECKS Disconnectthe leads to the primary winding of the high voltage transformer Disconnect the filament and secondary winding connections from the rest of the HV circuitry Using an ohmmeter set on a low range itis possible to check the continuity of all three windings The following readings should be obtained a Primary winding approximately 1 06 Q b Secondary winding approximately 57 3 c Filament winding less than 1 Q If the reading obtained are not stated as above then the high voltage transfo
3. co weibeig eu019Id 5 anbi4 Y31714 3SION HOLIMS THM Holvidue THM SN woo HOLON H3HHILS WS LHM uS AUS HOLON H3MO I8 NG NOHL3NOVIA 1no TYNYIVL YHOLON 2891 HOLSINHIHL NOHLINDVIN 110 119 TYNYIHL NOYLANOVW LOL D 1901 110 110 TYNYIHL NOHLINDVN ZOL M3 HOJSNVH L DIHLINNASVY uald Lodd HIWNYHOSSNVYL OE Wald 084 DIHLINNASV 29 5777 39VI 10A 19 IJILO3H AH SIN3NOdINOO 39V L 1OA HOLSINYIHL
4. 2 gt E pH gt N R20 R31 R32 R33 R40 R41 R42 R43 R50 R61 62 R63 64 R65 66 R67 68 R70 R71 R72 R73 R74 R79 R80 R83 84 R93 101 R200 R201 R300 72 73 vaw ww ojo mun He UU ce 0 ES SIS LOBOS I SO DI LESE SOS ID DID GOD 000 01 0000 0 0 000010 000 UU gt lt lt lt lt lt lt lt lt lt lt lt lt lt lt lt lt lt lt lt lt lt lt lt lt lt lt lt lt lt 4 lt lt Pp SP PEITGQOQNRNOP DUP N R V V FE F H L X X X I R 2397 Note The parts marked A may cause undue microwave exposure The parts marked are used in voltage more than 250V REF NO PART NO DESCRIPTION QTY CODE OVEN PARTS PCUSUA265WRPO Cushion FDUC A271WRKO Exhaust duct assembly FOVN A336WRYO Oven cavity PFILWAO053WRPO Oven light screen EVPA153WRFO Switch lever A EVPA154WRFO Switch lever B EVPA155WRFO Switch lever C SPRCA075WREO Switch spring A SPRCA076WREO Switch spring B HOK A081WRF Latch hook ZETEAOA7WRP Switch insulator DUC A566WRF Mg air guide DUC A567WRF Mg air guid
5. VOLUME DOUBLE 234567 QUANTITY service total count 1 NUMBER 1 after 1 sec 45 filter used time 2 NUMBER 2 Q after 1 sec 200 filter lim time 0 10 NUMBER 10 m sec 35 432 service total cook time CHECK 1 Denotes total service counts within the reach of user of which checking and clearing practices are de scribed in this instruction manual 2 Denotes the procedure for the servicer to disable checking clearing This procedure is instructed to service personnel only and is excluded from the operation manual 2 Practice for clearing Service s counts Flicker O 01 sec BUZZER PAD ORDER DISPLAY PHONE Door close CHECK NUMBER Q CHECK 82 68 CHECK O User s Total Counts 1 VOLUME 82 68 CHECK VOLUME 82 68 CHECK DOUBLE 234567 CHECK Q QUANTITY Total Counts of Service SET 0 CHECK 0 0 SET 0 CHECK 1 Denotes the procedure for the servicer to disable clearing This procedure is instructed to service per sonnelonly andis excluded fromthe operation manual 23 R 2397 PROCEDURE FOR ENTERING TO IC 2 When the control unit or IC 2 is exchanged re enter the constants of DEFROST and the memory pads 1 20 referring to items 1 and 2 below 1 How to enter the contents of DEFROST T STG1 STG2 STG3 STG AxT B 1 stage 10 power level
6. 4 ASZ 371100 102 Ros sree Ase 410001 va oc ZHOS IS3LLPO 1Q AOEZOV 9u AvidSid IN30S3HO TH LINN TOHINOO o 34 R 2397 95e e 7 1 19 2 wa 10 Wa 43 0d 34 35 R 2397 PARTS LIST Note The parts marked may cause undue microwave exposure The parts marked are used in voltage more than 250V PARTNO DESCRIPTON _ TY CODE ELECTRIC PARTS BM FMOTEA309WRKO Blower motor F1 QFS CAO17WREO Weak point A017 F2 QFS CA007WREO Fuse F6 3A WP1 WP2 QFS CAO18WREO Weak point A018 51 QSW MAO95WREO lst latch switch SW2 QSW MAO95WREO 2nd latch switch SW3 QSW MAO95WREO 3rd latch switch SW4 QSW MAO 8 6WREO onitor switch SW5 QSW MAO0 8 5WREO Stop switch Ci RC QZA165WREO High voltage capacitor OL RLMPTA028WREO Oven lamp SM RMOTDA205WREO Stirrer motor R1 RR WZA020WREO onitor resistor 4 3 Q 20W Tcl RTHM A037WREO agnetron thermal cut out 145 C TC2 RTHM A057WREO agnetron thermal cut out 145 C TC3 RTHM A015WREO Blower motor thermal cut out 115 C TC4 RTHM A083WREO Oven thermal cut out 115 C 1 RTRN A459W
7. S3HOLIMS 40 INS3NLSNFAV SIN YOLOW YIMOTA Q3 90 18 NOILVILNAA Q3390 18 NH3 LLVd 1104 L AH TANVd HONOL SS3NUVH Q3N3dO Q3 LHOHS 3SN4 0400 AlddNS H3MOd 3SION YOLOW H3MO 18 139208 1 HOLSIINH3H L 35V LNI HOLSINYIHL LSNVHX3 HOLSIINH3H L NOHL3NOVIA HOLON H3HUlLS HOLSIS3H HOLINOIN OG HL LLANO LND IVINH3HL 6212 21 1 9 TYWY3HL HOLOW COL 5 69 1 1 5 TYNYHIHL NOHL3NOVIN LOL 5 57 LNO LND TVINH3H L NOHL3NO VW R 2397 PROCEDURE LETTER A TEST PROCEDURES COMPONENT TEST MAGNETRON TEST NEVER TOUCH ANY PART IN THE CIRCUIT WITH YOUR HAND OR AN INSULATED TOOL WHILE THE OVEN IS IN OPERATION CARRY OUT 3D CHECK Isolate the magnetron from high voltage circuit by removing all leads connected to filamentterminal To test for an open circuit filament use an ohmmeter to make a continuity test between the magnetron filament terminals the meter should show a reading of less than 1 ohm To test for short filament to anode condition connect ohmmeter between one of the filament terminals and the case of the magnetron ground This test should be indicated an infinite resistance
8. Flicker O 0 1 sec BUZZER PAD ORDER DISPLAY PHONE Door close SET NUMBER within 2 sec 11 START NUMBER DEFROST 1 0 00 DEF O 9 9 1 0 99 DEF Ox2 A SELECTATIME 1 0 DEF 9 1 90 DEF 2 DEF POWER O SELECTAPOWER 1 90 100 DEF POWER 1 90 10 SELECTATIME 2 0 00 DEF O 0 2 0 00 DEF SELECTATIME 2 0 DEF O 0 2 0 DEF O B SELECTATIME 3 0 DEF O START 3 A DEF SET 4 DEF O SET 1 No key entry signal 2 To set B touch the selectapower key twice R 2397 2 How to enter the memory information Example Suppose cooking time 5 sec and output power 10096 are entered into the memory pad 1 OTHER CHECKING AND CLEARING PROCEDURE 1 To check the contents of defrost PAD ORDER DISPLAY PHONE Flicker 0 1 sec BUZZER Boorclase PAD ORDER DISPLAY PHONE SET 5 Door close SE NUMBER CHECK within 2 sec DEFROST 1 0 99 DEF CHECK o 1 NUMBER 1 0 5 NUMBER 1 5 DEE CHECK 1 90 POWER SET NUMBER 9 B SET 2 0 00 DEF CHECK A m DEF CHECK Enter the memory information into the memory pads 1 2 0 POWER 10 referring to above example The memory information B
9. MOTOR WINDING TEST CARRY OUT 3D CHECKS Disconnect the leads from the motor Using an ohmmeter check the resistance between the two terminals Resistance of Blower motor should be approximately 520 Resistance of Stirrer motor should be approximately 8 8 kO If incorrect readings are obtained replace the motor CARRY OUT 4R CHECKS NOISE FILTER TEST CARRY OUT 3D CHECKS Disconnect the leads from the terminals of noise filter Using an ohmmeter check between the terminals as described in the following table 14 R 2397 TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST WHT No E 7 ES i 2096 2096 I 0 5mH 0 22 uF 4700 pF Cy MEASURING POINT INDICATION OF OHMMETER Between N and L Open circuit Between terminal N and WHITW Short circuit Between terminal L and BLK Short circuit If incorrect readings are absorbed replace the noise filter CARRY OUT 4R CHECKS N TOUCH CONTROL PANEL ASSEMBLY TEST The touch control panel consists of circuits including semiconductors such as LSI IC etc Therefore unlike conventional microwave ovens proper maintenance cannot be performed with only a voltmeter and ohmmeter In this service manual the touch control panel assembly is divided into two units Control Unit and Switch Unit troubleshooting by unit replacement is described according to the symptoms indicated 1 Key Unit The f
10. CAUTION WHEN THE 15 LATCH SWITCH AND 2ND LATCH SWITCH ARE INSTALLED THE TWO 2 TABS OF THE LATCH HOOK SHOULD BE BROKEN 1ST 2ND 3RD LATCH SWITCH STOP SWITCH AND MONITOR SWITCH ADJUSTMENT In case 1st latch switch 2nd latch stop switch 3rd latch Switch and monitor switch do not operate properly due to a 2 mis adjustment the following adjustment should be made 1 Loosen the two 2 screws holding the latch hook 2 With the door closed adjust the latch hook by moving it back and forward or up and down In and out play of the door allowed by the latch hook should be less than 0 5mm The vertical position of the latch hook should be placed where the stop switch and 1st 2nd 3rd latch switches have activated with the door closed The horizontal position of the latch hook should be placed where the monitor switch has activated with the door closed 3 Secure the screws with washers firmly 4 Make sure of the 1st 2nd 3rd latch switches stop switch and monitor switch operation If those switches have not activated with the door closed loose two 2 screws holding latch hook and adjust the latch hook position After adjustment make sure of the following 1 Thestop switch and 1st 2nd 3rd latch switches interrupt the circuit before the door open when the door release lever is pulled and then and monitor switch close the 28 circuit when the door is opened Re install outer case and check for microwave lea
11. 20 msec Terminal not used owes Connected to Vc 5V 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 Internal clock oscillation frequency setting input The internal clock frequency is set by inserting the ceramic filter oscillation circuit with respect to XOUT terminal Internal clock oscillation frequency control output Output to control oscillation input of XIN Terminal not used Power source voltage 5V VC voltage of power source circuit input Terminal not used Signal coming from touch key When either one of G 12 line keys key matrix is touched a corresponding signal out of P11 P12 P14 P17 will be input into R3 When no key is touched the signal is held at L level Signal similar to R3 When either one of G 11 line keys on key matrix is touched a corresponding signal will be input into R2 Signal similar to R3 When either one of G 10 line keys on key matrix is touched a corresponding signal will be input into R1 Signal similar to R3 When either one of G 9 line keys on key matrix is touched a corresponding signal will be input into RO Anode segment of Fluorescent Display light up voltage 31V Vp voltage of power source circuit input Segment data signal T
12. Disconnect the leads from the terminals of the thermal cut out Then using an ohmmeter make a continuity test across the each two terminals as described in the table below CARRY OUT 4R CHECKS Table Thermal Cut out Test Temperature of ON Temperature of OFF Indication of ohmmeter Parts Name condition closed circuit condition open circuit When room temperature is 20 Thermal cut out 145 C This is not resetable type Above 145 C Closed circuit Thermal cut out 115 C This is not resetable type Above 115 C Closed circuit If incorrect readings are obtained replace the thermal cut out An open circuit oven thermal cut out 115 C indicates that the oven cavity has over heated this may be due to no load operation An open circuit magnetron thermal cut out 145 C indicates that the magnetron has overheated this may be due to resistricted ventilation cooling fan failure or a fault condition within the magnetron or HV circuit An open circuit blower motor thermal cut out 115 C indicates the blower motor winding has overheated this may be due to resisted ventilation or locked cooling fan MONITOR RESISTOR TEST CARRY OUT 3D CHECKS Disconnect the leads from the monitor resistor Using an ohmmeter and set on a low range Check between the terminals of the monitor resistor The resistance of monitor resistor should be read approx 4 30 If incorrect readings are obt
13. PPACGA142WRPO Door case packing PSHEPA520WREO Sealer film XCPSD4 2 Screw 4mm x 12mm XFPSD4 8 Screw 4mm x 8mm HTSD4 8 Screw 4mm x 8mm ANGKA W Latch fixing angle W W W o ooooo ooooo ooooo ooooo ooooo eoeodooo eoed gt Joint lever STPCA Latch head EVPA220 Head lever SPRCA097WRI atch spring BDGCA0 6 9WRI Door badge ANGKA768WRP Fixing plate upper P P 0 1 0 1 9 2 PIF 38 R 2397 Note The parts marked A may cause undue microwave exposure The parts marked are used in voltage more than 250V PARTNO DESCRIPTON CODE MISCELLANEOUS TINSMA004WRRO Instruction manual TLABHAO19WRRO Memory sticker FW VZB402WREO Switch harness FW VZB416WREO Main wire harness DWA023WREO Wire saddle DWAO27WREO Wire saddle S HLDWAO40WREO Wire holder A lD LABSA05AWRRO Fuse label HLDWAO29WREO Cord holder lr CAUHA082WRRO Caution label lr CAUHA083WRRO Belgium label CAUHA176WRRO Caution label I SPCNC161WRRO Rating label LABSAO008WRRO Fuse label F6 3A TLABSA064WRRO A017 label SCRE NUTS AND WASHERS 1 AUB 0 XCBWW30P0800 XBPSD50P12KS XFTSD40P08TV XOTSD40P0600 XBPBW40P08M0 LX BZA048WRE LX WZA035WRE XWWSD40 100 LX CZ2A038WRE Scr
14. og og g gt gt gt OM CM CR OM CH OM 2 2 2 2 2 2 2 2 Number key 0 NOTE The ON OFF time ratio does not exactly corre spond to the percentage of microwave power be cause approx 3 seconds are needed for heating up the magnetron filament TWO MAGNETRON OPERATION SYSTEM Two magnetrons MG1 MG2 are equipped in order to get higher microwave power output The primary windings of the high voltage transformers T1 T2 are connected so that each T2 HIGH VOLTAGE TRANSFORMER gue ER T1 HIGH VOLTAGE TRANSFORMER o REAR 931311939 OIHI3INIWNASV 931311939 OINLSWWASY 1 f HOLIOVdVO AH IO V RECTIFIER Je H V RECTIFIER MG2 MAGNETRON LOWER MG1 MAGNETRON UPPER magnetron can be oscillated alternatively according to the R 2397 COMMERCIAL FREQUENCY 5 POWER OUTPUT BY MAGNETRON 1 OPERATION OF MAGNETRON POWER OUTPUT BY MAGNETRON 2 frequency of the power supply Refer to the Figure 1 and 2 Figure B 1 High Voltage Circuit Figure B 2 Operation of Magnetron FUNCTION OF IMPORTANT COMPONENTS DOOR OPEN MECHANISM 1 The door release lever is pulled 2 The upper latch head is lifted up by the linked door release lever The latch lever is lifted up by th
15. 100 are given below DEF CHECK Memory No Cook Time Output Power 3 POWER 9 100 1 5 sec 100 2 10 sec 100 Repeat 3 20 sec 100 CHECK 9 4 30 sec 100 5 ignal ace 100 1 No key entry signa 6 50 sec 100 2 How to clear all counter user and service and total 7 1 min 100 cooking time and used time of filter 8 1 min 15 sec 10096 9 1 min 30 sec 100 10 2 min 10096 PAD ORDER DISPLAY PHONE 11 20 0 sec 990744039 SET Enterthe memory information of magnification of double SET NUMBER into the memory pads 1 20 all 1 80 DOUBLE NUMBER DOUBLE Ex set memory 1 CHECK NUMBER DOUBLE VOLUME NUMBER DOUBLE PAD ORDER DISPLAY PHONE SET NUMBER DOUBLE NUMBER DOUBLE 1 NUMBER 1 0 00 DOUBLE 1 8 0 NUMBER 1 80 DOUBLE Ox3 SET NUMBER DOUBLE 24 R 2397 COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE WARNING Avoid possible exposure to microwave energy Please follow the instructions below before operating the oven 1 CARRY OUT 3D CHECKS 2 Make sure thata definite click can be heard when the microwave oven door is unlatched Hold the door in a closed position then pull the door release lever with one hand this causes the latch leads to rise itis then possible to hear a click as the door switches oper ate 3 Visually check the door and cavity face plate for damage dents cracks signs of
16. arcing etc Carry out any remedial work that is necessary before operating the oven Do not operate the oven if any of the following conditions exist 7 Door does not close firmly Door hinge support or latch hook is damaged The door gasket or seal or damaged The door is bent or warped There are defective parts in the door interlock system Thereare defective parts inthe microwave generating and transmission assembly There is visible damage to the oven Do not operate the oven 1 2 3 4 Without the RF gasket Magnetron If the wave guide or oven cavity are not intact If the door is not closed If the outer case cabinet is not fitted Please refer to OVEN PARTS CABINET PARTS DOOR PARTS when carrying out of the following removal procedures OUTER CASE REMOVAL To remove the outer case proceed as follows 1 Disconnect oven from power supply 2 Open the oven door and wedge it open 3 Remove the two 2 screws from the lower portion of the rear cabinet and lower left portion of the oven cabinet back side using by special screw drive Type LHSTIX DLR4 100T 4 Remove the screws from rear and along the side edge of case 5 Slide the entire case back about 3cm to free it from retaining clips on the cavity face plate Lift the entire case from the oven 7 Remove the screws holding the rear cabinet to the oven Remove the rear cab
17. circuit O C Open circuit If incorrect readings are obtained make the necessary switch adjustment or replace the switch CARRY OUT 4R CHECKS WEAK POINT A018 WP1 OR WP2 TEST CARRY OUT 3D CHECKS If the weak point WP1 or WP2 is blown there could be a short in the asymmetric rectifier or there is aground in wire harness A short in the asymmetric rectifier may have occured due to short or ground in H V rectifier magnetron high voltage transformer or H V wire Check them and replace the defective parts or repair the wire harness CARRY OUT 4R CHECKS CAUTION Only replace weak point with the correct value replacement 12 PROCEDURE LETTER G R 2397 TEST PROCEDURES COMPONENT TEST WEAK POINT A017 F1 TEST CARRY OUT 3D CHECKS If the weak point F1 is blown there could be a shorts or grounds in electrical parts or wire harness Check them and replace the defective parts or repair the wire harness CARRY OUT 4R CHECKS CAUTION Only replace weak point with the correct value replacement FUSE F6 3A F2 TEST CARRY OUT 3D CHECKS If the fuse F2 F6 3A is blown when the door is opened check the latch switch monitor switch and monitor resistor If the fuse F2 F6 3 is blown by incorrect door switching replace the defective switch s and the fuse F2 F6 3A CARRY OUT 4R CHECKS CAUTION Only replace fuse with the correct value replacement TTHERMAL CUT OUT TEST CARRY OUT 3D CHECKS
18. defrost pad When the oven is shipped defrost is set as follows fig 2 1 STAGE POWER 10 OVEN ON OFF ON R 2397 DESCRIPTION OF LSI LSI IZA646DR The I O signal of the LSI IZA646DR is detailed in the following table Pinte Sms een Reference voltage input terminal reference voltage applied to the A D converter in the LSI Connected to 0 Temperature measurement input MAGNETRON THERMISTOR By inputting DC voltage corresponding to the temperature detected by the thermis tor this input is converted into temperature by the A D converter built into the LSI Temperature measurement input EXHAUST THERMISTOR By inputting DC voltage corresponding to the temperature detected by the thermis tor this input is converted into temperature by the A D converter built into the LSI A D input for troubleshooting Magnetron 1 Terminal to change functions according to the model Signal in accordance with the model in operation is applied to set up its function A D input for troubleshooting Magnetron 2 Connected to GND 0V Terminal not used Temperature measurement input INTAKE THERMISTOR By inputting DC voltage corresponding to the temperature detected by the thermis tor this input is converted into temperature by the A D converter built into the LSI Terminal not used Memory EEPROM clock output IN OUT Memory EEPROM data input output P44 P43 OUT Magnetron high voltage circuit drivin
19. in every period and input to the grid of the Fluorescent Display 4 Digit selection signal Signal similar to P16 P27 P25 Terminal not used P24 P23 Segment data signal Signal similar to P17 P22 Sound Voltage level control terminal This terminal P22 is to control volume level of buzzer sound with terminals P21 Since the volume level of buzzer sound depends on voltage energized it is control level in 3 steps by combining signal levels for P22 P21 Relationship of signal level combination to sound volume level is shown in the following table 1 3 in the table however are indicated in the descending order from the maximum level of sound volume through the minimum level Sound Volume P21 P22 1 Max E L 2 H L 20V 13V Min 7V t 2 3 3 Min L Output terminal P32 rectangular wave signal of 2 5kHz is output Sound level control signal Refer to above signal P22 R 2397 Description Input signal which communicates the door open close information to LSI Door closed H level signal 0V Door opened level signal 31 0V Connected to GND 2 2 Memory IC IC2 24 04 is a 4K bit serial memory enabling CMOS to be erased written electrically This memory is constructed with 512 registers x 8bits enabling individual access read and write operations to be perform
20. information 1 MODEL NUMBER 2 REF NO 3 PART NO 4 DESCRIPTION 39 R 2397 TAA vj 2 conner of lower wavegide OVEN AND CABINET PARTS A R 2397 CONTROL PANEL PARTS DOOR PARTS R 2397 PACKING ADD KIT CPADBA203WRKO DOOR PROTECTION SHEET SPADPO336WREO WRAP COVER DOOR PAD SPADF0341WREO TRAY HOLDER SPADPASOSWREO PACKING CASE SPAKCC551WREO PRINTING MATER Not replaceable items INSTRUCTION BOOK 95 SHARP CORP 5S1 30E Printed in Germany 42
21. soldering ground the technician as shown in the figure and use grounded soldering iron and work table approx 1M ohm Shapes of Electronic Components Transistor E DTA114YS Transistor B DTB143ES Transistor 25 1561 DTD143ES 25B953 2SB910M KRA101M Servicing of Touch Control Panel We describe the procedures to permit servicing of the touch control panel of the microwave oven and the precautions you musttake when doing so To perform the servicing power to the touch control panel is available either from the power line of the oven itself or from an external power source 1 Servicing the touch control panel with power supply of the oven CAUTION THEHIGH VOLTAGE TRANSFORMER OF THE MICROWAVE OVEN IS STILL LIVE DURING SERVICING PRESENTS A HAZARD Therefore when checking the performance of the touch control panel put the outer cabinet on the oven to avoid touching the high voltage transformer or unplug the primary terminal connector of the high voltage transformer to turn it off the end of such connector must 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 between the touch control panel and the oven itself is so short that the two can t be separated For those models check 22 and repair all the controls sensor related ones in cluded of the touch control panel while keeping it connected
22. to the oven B On some models the power supply cord between the touch control panel and the oven proper is long enough thatthey may be separated from each other Forthose models therefore itis possible 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 equivalentto the oven door being closed As for the sensor related controls of the touch control panel checking them is possible if dummy resistor s with resistance equal to that of the controls are used 2 Servicing the touch control panel with power supply 1 2 3 5 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 operational state that is equiva lent to the oven door being closed Connect an exter nal power source to the power input terminal of the touch control panel then it is possible to check and repair the controls of the touch control panel it is also possible to check the sensor related controls of the touch control panel by using the dummy resistor s Servicing Tools Tools required to service the touch control panel assembly Soldering iron 30W It is recommended to use a solderi
23. CATION ITEM DESCRIPTION Power Requirements 230 Volts 50 Hertz Single phase 3 wire grounded Power Consumption 2 7 kW Approx 13A Power Output 1700 watts nominal of RF microwave energy Method of IEC 705 Operating frequency of 2450MHz Outside Dimensions Width 510mm Height 335 mm Depth 470 mm Cooking Cavity Dimensions Width 330 mm Height 180 mm Depth 330 mm Control Complement Touch Control System The combination of cooking time and microwave power The oven can be programmed a series of up to 3 cookling stages The combination of microwave power and cooking time that can be input as folllows Cooking Micrwave power level Cooking time that Sequence that can be iused that can be iused 1 Stage only 0 100 Max 30 minutes 0 40 all stages Max 30 minutes any stages Max 60 minutes for 2 stages Max 90 minutes for 3 stages 50 100 Max 30 minutes for 3 stages 2 or 3 Stage NOTE If the oven used with the power level above 40 on any stage the maximum cooking time is 30 minutes in total Microwave Power level 100 90 80 70 60 50 40 30 20 10 0 MANUAL REPEAT key NUMBER keys MICROWAVE POWER SETTING key STOP CLEAR key START Key DOUBLE QUANTITY key DEFROST key SET key CHECK key VOLUME key Set Weight Approx 33kg GENERAL INFORMATION WARNING THIS APPLIANCE MUST BE EARTHED IMPORTANT HE WIRES IN THIS MAINS LEAD ARE COLOURED IN ACCORDANC
24. CKS Remove the eleven 11 screws holding the rear cabinet to the oven cavity Disconnectthe power supply cord from the noise filter Remove the one 1 screw holding the earth wire of the power supply cord to the noise filter angle Remove the rear cabinet with the power supply cord from the oven cavity Remove the two 2 screws holding the magnetron exhaust duct to upper and lower waveguide Disconnect all the wire leads from the two 2 magnetrons 8 Carefully remove each four 4 screws holding each two 2 magnetrons to waveguide When removing the screws hold the magnetron to prevent it from falling 9 Removethe magnetron fromthe waveguide with care so the magnetron antenna is not hit by any metal object around the antenna 10 Now the magnetron is free CAUTION WHEN REPLACE THE MAGNETRON BESURE THER F GASKET IS IN PLACE AND THE MAGNETRON MOUNTING SCREWS TIGHTENED SECURELY HIGH VOLTAGE TRANSFORMER REMOVAL Remove the outer case cabinet referring to OUTER CASE REMOVAL and CARRY OUT 3D CHECKS Disconnect the all wire leads from the magnetron s Remove the wire holder holding the high voltage wires 4 Disconnect all wire leads from the high voltage transformer s 5 Remove the each two 2 screws holding each high voltage transformer 6 Now high voltage transformer s is are free BLOWER MOTOR REMOVAL CARRY OUT 3D CHECKS Disconnect the wire le
25. CREWDRIVER WITH TAPE 3 Re solder the Relay RY 4 prior to reinstalling the Touch Control Panel Replacement of individual component is as follows CONTROL UNIT AND CONTROL PANEL FRAME WITH KEY 7 Remove two 2 screws holding the control panel mounting angle to the panel frame 8 Liftupthe control panel mounting angle from the panel frame 9 Disconnect connector G from the control unit by pushing the hooks of cable holder inwardly 10 Remove four 4 screws holding the control unit to the panel frame assembly 11 Push down the right side two 2 hooks fixing the control unitto the panel frame assembly and lift up the control unit upward 12 Now the control unit and control panel frame with key are free CAUTION At installing control panel unit assembly to main body set 1 Ensurethe installation of wiring related parts with out negligence 2 When inserting key cable to main body set ensure them free from caught in trouble In addition when installing the control panel assembly to base plate with screws be sure of pushing the control panel unit upward to fix with screws firmly Do not allow any wire leads to come near the varistor works because it will explode and the wire leads near by the varistor will be damaged NOTE 1 Before attaching a new key unit remove remai
26. E CONDITION OF OVEN 1 DOOR CLOSED Y MG2 MAGNETRON LOWER Y MG1 MAGNETRON UPPER 2 TIME KEY TIUCHED 3 COOKING TIME PROGRAMMED 4 START KEY TOUCHED Unc WP2 WEAK POINT Tr CUT OUT EE 018 SW2 2ND LATCH SWITCH 46 m 55 2 oF zt C1 CAPACITOR WEAK POINT A018 TC1 R MAGNETRON c 59 THERMAL u ge CUT OUT E gr 145 UPPER 5 gt 20 T 5 5 x 1 Eo 688 ASYMMETRIC BIS 58 SE RECTIFIER x lt 8 2 29 g Eb i 815 ES uz 8 16 x 8 8 gt 5 CONTROL 0 Gare 2 E H RT 2 gt SWITCH oe FRONT SW4 2 a n Cyn 5 8 uz C2 CAPACITOR a a a ba T2 HIGH VOLTAGE TRANSFORMER SW5 STOP SWITCH EXHAUST THERMISTER ASYMMETRIC RECTIFIER STIRRER MOTOR BLOWER MOTOR RECTIFIER Y MG2 MAGNETRON LOWER SW1 SW3 1ST LATCH SWITCH 3RD LATCH SWITCH PRIMARY INTERLOCK SWITCH Figure 0 2 Oven SChematic ON Condition 32 R 2397
27. E WITH THE FOLLOWING CODE GREEN AND YELLOW EARTH BLUE NEUTRAL BROWN LIVE APPEARANCE VIEW OVEN 11 10 5 4 3 13 12 I I II DISPLAY AND INDICATORS Check indicators after the oven starts to confirm the oven is operating as de sired 1 Cook indicator This indicator shows cooking in progress Memory number indicator Defrost indicator Check mode indicator Microwave power level indicator Digital display Filter indicator Double quantity indicator 9 3rd stage indicator 10 2nd stage indicator 11 1st stage indicator OPERATING KEYS 12 DOUBLE QUANTITY key 13 DEFROST key 14 NUMBER keys 15 MANUAL REPEAT key 16 STOP CLEAR key 17 MICROWAVE POWER SETTING key 18 START key 19 SET key 20 VOLUME key 21 CHECK key gt hn OND die 09 qe c R 2397 Control panel Door lock openings Tray Splash cover Oven lamp Air intake filter Air intake openings Oven cavity Door seals and sealing surfaces Door hinges Door Safety door latches Door open handle Outer cabinet Oven lamp access cover Ventilation openings Power supply cord Mounting plate Screw for mounting plate AUTO TOUCH CONTROL PANEL Lect 2 NUMBER EF CHECK POWER HH 801 5 oo 1 O ou 2 9 DOVRE FI
28. ER 21 7 11 8 10 9 12 15 x2 hy H 13 I 17 A o 16 gi 18 19 20 R 2397 OPERATION SEQUENCE OFF CONDITION Closing the door activates all door interlock switches 1st latch switch 2nd latch switch 3rd latch switch and stop Switch IMPORTANT When the oven door is closed the monitor switch contacts COM NC must be open When the microwave oven is plugged in a wall outlet 230 volts 50Hz the line voltage is supplied to the point A5 A7 in the control panel Figure O 1 on page 32 1 The digital display show NOTE When the door is opened or after cooking oven lamp blower motor and stirrer motors work for 1 minute MICROWAVE COOKING CONDITION Touch MANUAL REPEAT key and enter a desired cooking time with the touching NUMBER key Andthen touch START key Function sequence Figure O 2 on page 32 CONNECTED COMPONENTS RELAY Oven lamp Blower motor Stirrer motors RY1 Power transformer T1 RY3 Power transformer T2 RY4 1 Theline voltage is supplied to the primary winding of the high voltage transformer The voltage is converted to about 3 3 volts A C output on the filament winding and high voltage of approximately 2000 volts A C on the secondary winding 2 The filament winding voltage 3 3 volts heats
29. GE RECTIFIER The rated peak reverse voltage of D1 of the asymmetric rectifier is 6 KV The rated peak reverse voltage of D2 of the asymmetric rectifier is 1 7 KV D1 and D2 of the asymmetric rectifier or high voltage rectifier are shorted when the each peak reverse voltage goes beyond the each rated peak reverse voltage The process of the blowing the weak point A018 WP1 or WP2 1 The high voltage rectifier is shorted by some fault when microwave cooking 2 The peak reverse voltage of D2 of the rectifier goes beyond the rated peak reverse voltage 1 7 KV in the voltage doubler circuit 3 D2 of the rectifier is shorted 4 The large electric currents flow through the high voltage winding of the high voltage transformer 5 The large electric currents beyond 10A flow through the primary winding of the high voltage transformer 6 The weak point A018 WP1 or WP2 blows by the large electric currents 7 The power supplying to the high voltage transformer is cut off EXHAUST THERMISTOR The thermistor is a negative temperature coefficient type The temperature in the exhaust duct is detected through the resistance of the thermistor If the temperature is high the control panel will display EE7 and the oven will stop to avoid overheating and catching fire If the thermistor is open the control panel will display EE6 and the oven will stop INTAKE THERMISTOR This thermistor detects ambient air temperature MAGNETRON THERMIST
30. HEADS REMOVAL 7 Remove the door release lever from the door assem bly 8 Remove the three 3 screws holding the joint plate to the door panel 9 Release the latch spring from the tab of the joint lever and joint plate 10 Release the latch heads from joint lever and joint plate 11 Now the latch heads are free DOOR FRAME REMOVAL 12 Set the four 4 tabs of the door frame upright 13 Remove the door frame from the door panel Now door frame is free DOOR GLASS REMOVAL 14 Remove the four 4 screws holding the two 2 outside window fixing plates to the door panel 15 Now the door glass is free RO R 2397 SERVICE INFORMATION IMPORTANT When replace the magnetron MG1 and or MG2 the relays RY3 and RY4 on control unit must be replacedatthe same time Because if the magnetron s life has been over the relay s life may also be over MICROWAVE MEASUREMENT After adjustment of door latch switches monitor switch and door are completed individually or collectively 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 emis sion in excess of 5mW cm2 at any point or more from external surface of the oven PREPARATION FOR TESTING Before beginning the actual test for leakage proceed as follows 1 Make sure t
31. If a low or zero resistance reading is obtained then the magnetron should be replaced MICROWAVE OUTPUT POWER IEC 705 1988 The following test procedure should be carried out with the microwave oven in a fully assembled condition outer case fitted Microwave output power from the magnetron can be measured by way of IEC 705 i e It is measured by how much power the water load can absorb 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 4 187 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 formula is as follows Pxt 4 1872 P W 24 187 x Vx AT t Our condition for water load is as follows Room temperature around 20 C Power supply Voltage Rated voltage Water load 1000g Initial temperature 10 2 C Heating time 25 sec P 170xAT Measuring condition 1 Container The water container must be a cylindrical borosilicate glass vessel having a maximum material thickness of 3 mm and an outside diameter of approximately 190 mm 2 Temperature of the oven and vessel The oven and the empty vessel are at ambient temperature prior to the start the test 3 Temperature of the water The initial temperature of the water is 10 2 C 4 Select the init
32. LEADS OF THE POWER SUPPLY CORD TO COME NEAR THE HIGH VOLTAGE TRANS FORMER BECAUSE THE HIGH VOLT AGE TRANSFORMER BECOMES HOT Re install 1 Insert the power supply cord into the cord bushing 2 Connect the brown and blue wires of power supply cord into the terminals of noise filter referring to pictorial diagram 3 Insert the green yellow wire of power supply cord into the earth angle and tight the screw holding the earth angle Re install the cord bushing to the rear cabinet Re install the rear cabinet to oven cavity and the bottom plate with the eleven 11 screws and two 2 washers CARRY OUT 4R CHECKS Figure C 3 Power supply cord replacement 1ST LATCH 2ND LATCH 3RD LATCH MONITOR AND STOP SWITCHES REMOVAL CARRY OUT 3D CHECKS 2 Remove the control panel from the oven cavity refer 6 ring to CONTROL PANEL REMOVAL 3 Remove the two 2 screws holding the latch hook to the oven cavity 4 Open the door and pull the latch hook out of the oven latch hook For 1st latch and stop switches removal 6 1 Disconnect the wire leads from the 1st latch and stop switches 6 2 Remove the single 1 screw and nut holding the 1st latch and stop switches to the latch hook cavity 5 For 1st latch 2nd latch or Monitor switch removal 5 1 Disconnect the wire leads from the switch 5 2 Push the retaining tabs outward slightly and then pull the switch forwards and remove it from the
33. N 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 while the device is energized VARNING MICKROVAGSSTRALING Personal f r inte uts ttas f r mikrov gsenergi som kan ustrala fr n magnetronen eller andre mikrov gsalstrande anordningar dessa r felanslutna eller anv nds fel s tt Alla in och utg ngsanslutningar f r mikrov gor vagledare fl nsar och packningar m ste vara fast anslutna Mikrov gsgeneratorn f r inte arbeta utan att absorberande belastning ansluten Titta aldrig in i ppen v gledare eller antenn n r mikrov gsgeneratorn r p kopplad eller laddad VAROITUS MIKROAALTOS TELY Kayttaja ei saa joutua alttiiksi mikroaaltoenergialle jota voi s teill magnetronista tai muusta mikroaaltoja kehitt v st laitteesta jos sit k ytet n tai jos se kytket n Kaikkien mikroaaltoliit nt jen sek sy tt ett ulostulopuolella aaltoputkien laippojen ja tiivisteiden tulee olla varmistettuja Mikroaaltouunnia ei koskaan saa k ytt ilman kuormaa jossa mikroaaltoenergiaa kuluu Avoimeen aaltoputkeen tai antenniin ei kosk
34. OR The air temperature around the lower magnetron is detected through the resistance of the thermistor If the temperature is high the control panel will display EE17 and the oven will stop to protect the lower magn etron against overheat If the thermistor is open the control panel will display EE16 and the oven will stop MAGNETRON THERMAL CUT OUTS 145 TC1 TC2 These thermal cut outs protect the magnetrons against overheat If their temperature go up higher than 145 C because the blower motor is interrupted the ventilation openings are blocked the thermal cut outs 1 2 will open and the line voltage to the high voltage transformer T1 T2 will be cut off and the operations of the magnetrons MG1 MG2 will be stopped The defective thermal cut out must be replaced with new rated one BLOWER MOTOR THERMAL CUT OUT 115 C TC3 This thermal cut out protect the blower motor against overheat If its temperature goes up higher than 115 C because the blower motor is locked or the ventilation openings are blocked the contacts of the thermal cut out will open and the line voltage to the control unit will be cut off and the operation of the oven will be stopped The defective thermal cut out must be replaced with new rated one OVEN THERMAL CUT OUT 115 C TC4 This thermal cut out protects the oven against overheat If the temperature goes up higher than 115 C because the food catches fire the contacts of thermal cut out wil
35. PONENTS WITH POTENTIALS ABOVE 250V Y MG1 MAGNETRON UPPER ou amp TC2 MAGNETRON 28 SWESoND LATCH SWITCH WP2 WEAK POINT A018 THERMAL C Pu OUT 55 gt o 29 Se rc bd z C1 H V CAPACITOR WP1 WEAK POINT 018 e TC1 1 gt MAGNETRON m 59 THERMAL E CUT OUT k E 145C UPPER 5 28 y d e gt Sub 8 d a d go 58 ASYMMETRIC H 15 258 H zu RECTIFIER x i gt 2 5 e E o o ce i az OLA Ze 77 77 S 2 5 CONTROL zu ER EO UNIT dum ce ml mm SE VEE 3559 J pp 522 pce quee 888 d S Sg a 2 Ni e 5 2 E 8 77 2 52 7 C2 H V CAPACITOR 518 8 F x c 9 o ui 1 E EE m 09 ui 5 920 60 i9 7 o ND 2 g W zu E z 5 z 5 5 d d 2 gt o ASYMMETRIC 8 a RECTIFIER x e 77 77 SW1 SW3 1ST LATCH SWITCH 3RD LATCH SWITCH PRIMARY INTERLOCK SWITCH Figure O 1 Oven SChematic OFF Condition SCHEMATIC NOT
36. R 2397 SHARP SERVICE MANUAL 5503R2397H COMMERCIAL MICROWAVE OVEN MODEL R 2397 In interests of user safety the oven should be restored to its original condition and only parts identical to those specified should be used TABLE OF CONTENTS Page CAUTION MICROWAVE 1 1 PRODUCT SPECIFICATIONS mui 2 GENERAL IMPORTANT INFORMATION 2 APPEARANCE VIEW dat eee ed Pe 3 OPERATION SEQUENCE E 4 FUNCTION OF IMPORTANT 2020 nenen 5 SERVIEING LEA 7 TEST PROCEDURE ere eua 10 TOUCH CONTROL PANEL ASSEMBLY 17 COMPONENT REPLACEMENT AND ADJUSTMENT 25 MICROWAVE MEASUREMENT 30 TEST DATAAT A GLANCE dettes certet te erattu een ESE REREN ENEEK 31 WIRING DIAGRAM iie idt tee cia lass cha dee fe de 32 ROSEO AMbIel ri 33 CGONTROL PANELE CIRCUIT ED IRR ek n CELA Yes a dag Rn HORA ga donna T ke du TRE 34 PRINTED WIRING BOARDS 35 PARTS rausere varde 36 SHARP CORPORATION R 2397 CAUTIO
37. REO High voltage transformer MG1 RV MZA239WREO agnetron FH HZA050WREO agnetron thermistor QSOCLAO11WREO Oven lamp socket FH HZA049WREO Intake thermistor FPWBFA296WREO Noise filter QFSHDAO19WREO Fuse holder QACCVA0 6 6WREO Power supply cord DH HZAOO09WRKO Exhaust thermistor FW QZA104WRKO High voltage rectifier assembly CABINET PARTS FDAI A183WRWO Base plate assembly PSHEGAO006WREO Rubber sheet A PSHEGA007WREO Rubber sheet B GCOVAA250WRWO Rear cabinet FFTASAO064WRYO Oven lamp access cover assembly PCUSU0407WRPO Cushion PREFHA051WRPO Lamp reflector GCABUA523WRPO Outer case cabinet PZETEAO71WRPO Cabinet insulation sheet ae OP WDNR pt D o opm w Up Um D CONTROL PANEL PARTS DPWBFB382WR Control unit QCNCMA308DRI 4 pin connector QCNCMA312DRI 3 pin connector QCNCMA145DRI 3 pin connector OCNCWAO30DRI 12 pin connector QCNCMAO3 9DREO 3 pin connector H OLUG A002PREO Tab terminal TAB1 4 RV KXA053DREO Fluorescent display tube PCUSGA359WRPO Cushion 11 1042 Capacitor 1 uF 50V RC EZA192DREO Capacitor 35V VCEAB31HW335 Capacitor KIOWE 50V VCKYB11EX103 Capacitor 01 uF 25V VCEAB31AW476 Capacitor 10V VCKYD11CY103 Capacitor 01 uF 16V VCEAB31CW107 Capacitor 16V VCEAB31EW226 Capacitor 25V VCKYD11CY103N Capacitor 4202 16V 1032 C
38. T Ifthe oven becomes inoperative because follow the Sequence of Operation in performing the checks of a blown fuse F2 F6 3A in the 1st latch Many of the possible causes of trouble will require that a switch monitor switch monitor resisitor specific test be performed These tests are given a circuit check the 1stlatch switch monitor procedure letter which will be found in the Test switch and monitor resistor before re Procedure section placing the fuse F2 F6 3A R 2397 TEST PROCEDURE POSSIBLE CAUSE AND DEFECTIVE PARTS HIGH VOLTAGE TRANSFORMER T1 HIGH VOLTAGE TRANSFORMER T2 H V RECTIFIER ASSEMBLY FOR MG1 H V RECTIFIER ASSEMBLY FOR MG2 MAGNETRON MG2 H V WIRE HARNESS H V CAPACITOR C1 H V CAPACITOR C2 1ST LATCH SWITCH SW1 2ND LATCH SWITCH SW2 3RD LATCH SWITCH SW3 MONITOR SWITCH SW4 STOP SWITCH SW5 WEAK POINT A018 WP1 WEAK POINT A018 WP2 WEAK POINT A017 FUSE F6 3A F2 does not appear on display when power cord is plugged into wall outlet Control panel can not accept key in Fuse F2 F6 3A blows when the door is opened Home fuse blowns when power cord is plugged into wall outlet Weak point F1 blowns when power cord is plugged into wall outlet Oven lamp fan motor and stlrrer motor do not work for 1 minute whenever the door is opened OFF or after cooking CONDITION Fuse F2 F6 3A blowns when power cord is plugged into wall outlet Oven lamp does not light whe
39. aan saa katsoa virran ollessa kytkettyn ADVARSEL MIKROB LGESTR LING Personell m ikke utsettes for mikrob lge energi som kan utst les fra magnetronen eller andre mikrob lge generende deler dersom apparatet feilbetjenes eller blir feiltikoplet Alle inn og ut tilkoplinger i forbindelse med mikrob lge str lingen b lgeledere flenser og tetningsringer pakninger m festes ordentlig Aldri bruk apparatet med mindre en mikrob lge absorberende last er plassert i ovnsrommet Aldri se direkte inn i en pen b lgeleder eller antenne imens apparatet er str mf rende ADVARSEL MIKROBOLGEBESTRALING Man ber ikke udsaette sig for mikrobelgebestr ling fra magnetronen eller andre mikrobelgefrembringende anordninger hvilket kan ske hvis apparatet er forkert tilsluttet eller bruges forkert Alle mikrobelgeindgange og udgange belgeledere flanger og teetningsstrimler m v re forsvarligt udf rt Anvend aldrig ovnen uden en mikrob lgesabsorberende anordning Se aldrig ind i en ben b lgeleder eller antenne mens ovnen er i brug R 2397 SERVICE MANUAL PRODUCT SPECIFICATIONS SHARP COMMERCIAL MICROWAVE OVEN GENERAL INFORMATION R 2397 GENERAL IMPORTANT INFORMATION This Manual has been prepared to provide Sharp Corp Service engineers with Operation and Service Information APPEARANCE VIEW It is recommended that service engineers carefully study the entire text of this manual so they will be qualified to render satisfacto
40. ads from the blower motor and the blower motor thermal cut out Removethe one 1 screw holding the blower motor to the oven cavity 4 Removethe one 1 screw holding the blower motor to the chassis support 5 Remove the blower motor Now the blower motor is free STIRRER MOTOR UPPER REMOVAL Remove the outer case cabinet referring to OUTER CASE REMOVAL and CARRY OUT 3D CHECKS Disconnect the wire leads from the stirrer motor up per 3 Remove the one 1 screw holding the stirrer motor upper to the oven cavity 4 Turn and lift up the stirrer motor upper 5 Now the stirrer motor upper is free STIRRER MOTOR LOWER REMOVAL Disconnect oven from the power supply Remove the stirrer motor cover by snipping off the material in four portions Where the portions have been snipped off bend the portions flat No sharp edge must be evident after removal of the stirrer cover Disconnect wire leads from the stirrer motor See Positive lock connector removal 5 Remove one 1 screw holding the stirrer motor to oven cavity 6 Now the stirrer motor lower is free 7 Afterreplacement use the one 1 screw to fit the stirrer motor cover This screw has been fitted to the base plate near the stirrer motor cover beforehand OVEN LAMP SOCKET REMOVAL CARRY OUT 3D CHECKS Remove the oven lamp Pull the wire leads from the oven lamp socket by pushing the terminal hole
41. ained replace the monitor resistor CARRY OUT 4R CHECKS R 2397 PROCEDURE LETTER K TEST PROCEDURES COMPONENT TEST MAGNETRON THERMISTOR TEST CARRY OUT 3D CHECKS Disconnect connector H from the CPU unit Measure the resistance of the thermistor with an ohmmeter Connect the ohmmeter leads to the leads of the thermistor Room Temp Resistance 15 C s nec e tis Approx 15 91 20 6 edes Approx 13 04 250 Approx 10 74 If the meter does not indicate above resistance replace the thermistor CARRY OUT 4R CHECKS EXHAUST THERMISTOR TEST CARRY OUT 3D CHECKS Disconnect connector B from the CPU unit Measure the resistance of the thermistor with an ohmmeter Connect the ohmmeter leads to the leads of the thermistor Room Temp Resistance 15 77 45 tristes 61 47 25 49 12 If the meter does not indicate above resistance replace the thermistor CARRY OUT 4R CHECKS INTAKE THERMISTOR TEST CARRY OUT 3D CHECKS Disconnect connector D from the CPU unit Measure the resistance of the thermistor with an ohmmeter Connect the ohmmeter leads to the leads of the thermistor Room Temp Resistance 15 88 20 edes Approx 13 03 25 10 74 If the meter does not indicate above resistance replace the thermistor CARRY OUT 4R CHECKS
42. apacitor 01 50V VCKYD11CY103 Capacitor 01 16V VCKYD11CY103 Capacitor 01 16V VCEAB31EW226 Capacitor 1032 Capacitor VCKYD11CY103 Capacitor VCKYB11EX103 Capacitor VCKYD11HF104Z Capacitor VCI HW104 Capacitor A B D G EN EE P PRIPPRENHAPRPRPRPHBINRPRPRPHBIP NP BHP RRP R 2397 Note The parts marked A may cause undue microwave exposure The parts marked are used in voltage more than 250V PARTNO __pesoniprion QTY CODE EAB31HW225M Capacitor 2 2 uF 50V Vea miM Capacitor 1 0 uF 50V VCKYD11CY103N Capacitor 0 01 uF 16V RCRS AO10DREO Ceramic resonator CST4 00MGW D11bES1 1 Diode 11ES1 SS270A 1 Diode 1SS270A L1ES1 1 Diode 11ES1 55270 1 Diode 155270 11 51 1 Diode 11 51 155270 1 Diode 1SS270A 155270 1 Diod 155270 155270 1 Diod 155270 155270 1 Diod 155270 IZA646DREO SI IZA571DREO IC AT24C04 525 953 4 Transistor S2SA1561TL 3 Transistor H TZA037CBEO ransistor H TZA037CBEO ransistor VS2SB910MR 4 Transistor 114 5 3 Transistor 143ES 3 Transistor D143ES 143ES 3 Transistor B143ES 1820 Resistor 1 8k ohm HF561J Resistor 560 ohm 1029 Resistor 1 0k ohm 1539 Resistor 15k ohm 1509 Resistor 15 ohm Resistor 15k ohm Resistor 15k ohm Resistor 2 7k ohm Resistor 10k ohm Resistor 3 3k oh
43. closed On opening the door each of these switches operate inversely 3 If the door is opened and the 1st latch switch contacts fail to open the fuse F2 F6 3A blows simultaneously with closing of the monitor switch contacts CAUTION BEFORE REPLACING A BLOWN FUSE F2 F6 3A TEST THE 1ST LATCH SWITCH MONITOR SWITCH AND MONITOR RESIS TOR FOR PROPER OPERATION REFER TO CHAPTER TEST PROCEDURE MONITOR RESISTOR R1 The monitor resistor prevents the fuse F2 F6 3A 250V bursting when the fuse F2 F6 3A 250V blows due to the operation of the monitor switch NOISE FILTER The noise filter assembly prevents radio frequency inter ference that might flow back in the power circuit WEAK POINT F1 Ifthe wire harness or electrical components make a short circuit this weak point F1 blows to prevent an electric shock or fire hazard R 2397 FUSE F6 3A 250V F2 1 Ifthe wire harness or electrical components are short circuited this fuse blows to prevent an electric shock or fire hazard 2 The fuse also blows when 1st latch switch SW1 remains closed with the oven door open and when the monitor switch SW4 closes ASYMMETRIC RECTIFIER The asymmetric rectifier is solid state device that pre vents current flow is both directions And it prevents the temperature rise of the high voltage transformer by blowing the weak point A018 WP1 or WP2 when the high voltage rectifier is shorted A ASYMMETRIC RECTIFIER HIGH VOLTA
44. e cover FGLSPAO61WRY Ceramic shelf FPLT AOO4WRY Stirrer antenna upper assembly FPLT AOO5WRY Stirrer antenna lower assembly 7 62WRP Partition angle R LANGQA370WRP Oven lamp mounting plate LBNDKAO75WRP Capacitor holder PGIDHA05A4WRW Water proof cover SFTPAO31WRF Antenna motor shaft PCOVPA310WRF Splash cover PCUSGA405WRP Cushion PCUSGA40 9WRP Cushion PCUSUA413WRP Cushion PCUSUA415W Cushion S C gt K LH po plo wp i po GI CQ UNE PCUSUA41 6W Cushion PDUC A607W g exhaust duct PCUSUA414W Cushion LANGQA251W oise filter angl LANGQ0382W Earth angle LANGFA172W Chassis support 006 Cord bushing PCUSGA441W Cushion FFIL A003W Air intake filter assembly HDECEA001W Decoration HDECQA146W Corner cap HDECQA147W Corner cap sash left right LANGKA679W Fixing angle s HNG A215W Upper oven hinge HNG A216W Lower oven hinge PCUSUAA448W Cushion PCUSUA417W Cushion PCUSUA2 68W Cushion PCUSUA447W Cushion SPRCA101WRI Switch spring C DOOR PARTS DDORFA74 6WR Door assembly FDORFA28 9WRTO Door panel assembly GCOVAA242WRYO Door case FHNDMAO11WRYO Door lever assembly 5 Choke cover JHNDPA1 6 9WRMO Door handle LANGKA7 6 6WRPO Outside window fixing plate PCUSGA430WRPO Cushion PGLSPA457WREO Door glass
45. e door release lever The joint lever is lifted up by the latch lever The lower latch head is lifted up by the joint lever Now both latch heads are lifted up so they can be released from the latch hook 7 Now the door can be opened Door release 7 Latch head S lt Monitor switch 5 VG 2 Latch hook 2nd latch switch Joint lever 1st latch switch Stop switch Latch head 3rd latch switch Figure D 1 Door Open Mechanism 1ST LATCH SWITCH SW1 2ND LATCH SWITCH SW2 3RD LATCH SWITCH SW3 AND STOP SWITCH SW5 1 When the oven door is closed the contacts COM NO must be closed 2 Whenthe oven dooris opened the contacts COM NO must be opened MONITOR SWITCH SW4 The monitor switch is activated the contacts opened the upper latch head and switch lever A while the door is closed The switch is intended to render the oven inopera tive by means of blowing the fuse F2 F6 3A when the contacts of the 1st latch switch SW1 fail to open when the door is opened Function 1 When the door is opened the monitor switch SW4 contacts close to the ON condition due to their being normally closed At this time the 1st latch switch SW1 is in the OFF condition contacts open due to their being normally open contact switches 2 As the door goes to a closed position the monitor switch contacts are opened and 1st latch switch con tacts are
46. ed Details of input output signal for IC2 are as shown in the following diagram FUNCTIONAL DIAGRAM START CYCLE TES GEN ON p th amp CONTROL m E2PROM SLAVE ADDRESS 512x8 REGISTER COMPARATOR TOP VIEW ADDRESS COUNTER DATA REGISTER Bout Figure T 4 Relation between Pin Nos and Signals Pin No Signal I O Description 1 3 A0 A2 IN Connected to GND 4 VSS IN Connected to VC 5V 5 SDA IN OUT Serial data input output input outputs data to IC1 6 SCL IN Clock signal input input outputs sireal data at every one pulse 7 TEST IN Connected to VC 5V 8 VCC IN Connected to GND 21 49 2397 SERVICING Precautions for Handling Electronic Components This unit uses CMOS LSI in the integral part of the circuits When handling these parts the following precautions should be strictly followed CMOS LSI have extremely high impedance at its input and output terminals For this reason it is easily influ enced by the surrounding high voltage power source static electricity charge in clothes etc and some times it is not fully protected by the built in protection circuit In order to protect CMOS LSI Whenstoring and transporting thoroughly wrap them in aluminium foil Also wrap all PW boards containing them in aluminium foil When
47. ese repairs make a visual d inspection of the varistor for burning damage and examine the transformer with _ tester for the presence of layer short circuit check primary coil resistance any abnormal condition is detected replace the defective parts 37 53 02 VRS2 CARRY OUT 4R CHECKS 16 R 2397 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 Control Unit 2 Key Unit The principal functions of these units and the signals communicated among them are explained below 1 1 2 3 4 5 6 7 8 9 Control Unit Signal of key touch and oven function control are all processed by one microcomputer Power Supply Circuit This circuit changes output voltage at the secondary side of the low voltage T1 transformer to volatges required at each part by full wave rectifying circuit constant voltage circuit etc ACL Circuit This is an Auto clear Circuit i e a reset circuit which enables IC1 to be activated from initial state Power SYNC Signal Generating Circuit This is a circuit for generating power SYNC signal by virtue of the secondary side output of transformer T1 This signal is used for a basic frequency to time processing and so on Clock Circuit This is a circuit for controlling clock frequency re quired for operating IC1 IC1 Ma
48. ew 3mm Screw 5mm x x Screw 4mm x x x Screw 4mm Screw 4mm Special screw Special washer Washer 4mm x 1mm Special screw Special screw Screw 4mm x 12mm Screw 3mm x 12mm Screw 3mm x 6mm Special screw Screw 4mm Screw Screw Screw Screw X EZA004WRE XFTWW40P120 XCBWW30P120 XCPSD30P06X0 LX CZA057WRE XHPSD40P0500 5mm 8mm 0 12mm 0 10mm 0 20mm 0 10mm 0 8mm 12mm XHTSD40P08R XOTSD40P120 XOTWW40P100 XOTWW40P200 XCPSD30P100 Screw XFPSD40P08K0 Screw XOTSD40P12RVO Screw LX BZAO064WREO Special XCPSD30P06000 Screw 6mm XOTSD40P10000 Screw 10mm XBPUW40P04000 Screw 4mm XBTUW40P10000 Screw 10mm XFTSD40P08000 Screw 8mm XTPSD40P08000 Screw 8mm XWWSD50 06000 Washer 5mm x 0 6mm XONSC40P10000 Screw 4mm x 10mm LX BZA110WREO Special screw 0 0 0 0 0 0 0 1 2 3 4 5 6 j 8 9 10 11 12 13 14 T5 16 17 18 19 20 I o oo000 o0o0000 00000 00 00060 I N OX Xx OY PO UBWW40P300 Screw 4mm 30mm BPSD30P28K Screw 3mm 28mm ESD30 240 Nut 3mm x 2 4mm JPSD40P100 Screw 4mm 10mm OTSC40P120 Screw 4mm 120mm HPSD50P080 Screw 5mm 8mm EPSD30P12XS Screw 3mm 12mm 00 01 HOW TO ORDER REPLACEMENT PARTS To have your order filled promptly and correctly please furnish the following
49. g signal To turn on and off the cook relay In 10096 power level operation L level during cooking H level otherwise In other power level operation 90 80 70 60 50 40 30 20 10 or 095 H and L level is repeated according to power level Power level ON OFF Power level ON OFF 100 48sec Osec 40 26sec 90 44sec 4sec 30 32sec 80 40sec 8sec 20 36sec 70 36sec 12sec 10 40sec 60 32sec 16sec 0 48sec 50 26sec 22sec Power supply output at thermistor detecting circuit Output 5V in cooking only but apply high impedance to others to prevent thermistor from electrolytic corrosion ocurrence Terminal not used Oven lamp Blower motor and Stirrer motor driving signal Square Wave form 50Hz Toturn on and off the shut off relay RY1 The Square waveform voltage is deliv ered to the RY1 relay driving circuit and relays RY3 RY4 COOK RELAY control circuit 18 22 P37 P33 Terminal not used 23 P32 Signal to sound buzzer This signal is to control the 2 5kHz continuous signal A key touch sound 6 18 265 B Guydance sound C Completion sound 200 gt gt 200usec During cooking R 2397 Description Signal synchronized with commercial power source frequency This is basic timing for all time processing of LSI
50. gh voltage transformer is shorted CARRY OUT 4R CHECKS NOTE FORMEASUREMENT OF THE RESISTANCE OF THE RECTIFIER THE BATTERIES OF THE MEASURING INSTRUMENT MUST HAVE A VOLTAGE AT LEAST 6 VOLTS BECAUSE OTHERWISE AN INFINITE RESISTANCE MIGHT BE SHOWN IN BOTH DIRECTIONS HIGH VOLTAGE CAPACITOR TEST CARRY OUT 3D CHECKS A Isolate the high voltage capacitor from the circuit B Continuity check must be carried out with measuring instrument which is set to the highest resistance range C Anormal capacitor shows continuity for a short time kick and then a resistance of about 10MQ after it has been charged D A short circuited capacitor shows continuity all the time E An open capacitor constantly shows a resistance about 10 because of its internal 10MQ resistance F When the internal wire is opened in the high voltage capacitor shows an infinite resistance G The resistance across all the terminals and the chassis must be infinite when the capacitor is normal If incorrect reading are obtained the high voltage capacitor must be replaced CARRY OUT 4R CHECKS SWITCH TEST CARRY OUT 3D CHECK Slsolate the switch to be tested and using an ohmmeter check between the terminals as described in the following table Table Terminal Connection of Switch COM Common terminal Plunger Operation COM to NO COM to NC NO Normally open terminal Released S C NC Normally close terminal Depressed S C O C S C Short
51. hat the test instrument is operating normally as specified in its instruction booklet Important Survey instruments that comply with the requirement for instrumentations as prescribed by the performance standard for microwave ovens must be used for testing Recommended instruments are NARDA 8100 NARDA 8200 HOLADAY HI 1500 SIMPSON 380M Place the oven tray into the oven cavity Place the load of 275 15ml of water initially at 20 5 C in 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 electrically non conductive material such as glass or plastic The placing of this standard load in the oven is important not only to protect the oven but also to insure that any leakage is measured accurately 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 cool water Move the probe slowly not faster that 2 5cm sec along the gap The microwave radiation emission should be measured at any point of 5cm or more from the external surface of the oven Microwave leakage measurement at 5 cm distance 30 R 2397 TEST DATA AT A GLANCE Parts Value Data Weak point A018 Weak point A018 Weak point A017 Fuse F6 3A 250V Thermal cut out Mag 145 C 145 C Thermal c
52. he latch holes Refer to latch switch adjustments 2 Deviation of the door alignment from horizontal line of cavity face plate is to be less than 1 0mm 3 The door is positioned with its face depressed toward the cavity face plate Reinstall outer case and check for microwave leakage around the door with an approved microwave survey meter Refer to Microwave Measurement Proce dure OUTER CASE CABINET Figure C 5 Door Assembly Replacement and Adjustment CHOKE COVER REMOVAL 1 Insert an iron plate thickness of about 0 5mm or flat type screw driver to the gap between the choke cover and door panel as shown figure to free the engaging part The protect sheet may be used not to damage the door panel 29 2 Lift up the choke cover now cove is free FLATE TYPE SCREW DRIVER PROTECTION BY TAPE LOWER OVEN HING d E DOOR COVER PANEL UPPER OVEN HING Figure C 6 Choke Cover Removal DOOR COMPONENTS REMOVAL Remove the door assembly referring to from item 1 through item 3 of DOOR REPLACEMENT 1 Place the door assembly on a soft cloth with facing up UPPER AND LOWER OVEN HINGE REMOVAL 2 Remove the choke cover referring to CHOKE COVER REMOVAL Release the oven hinges from the door panel Now the oven hinges are free DOOR HANDLE REMOVAL 5 Remove the two 2 screws holding the door handle to door 6 Remove the door handle from the door panel UPPER AND LOWER LATCH
53. he relation between signals and indicators are as follows Signal Segment Signal Segment Key strobe signal Signal applied to touch key section A pulse signal is input to RO R3 terminal while one of G 6 line keys on key matrix is touched Segment data signal Signal similar to P17 Key strobe signal Signal applied to touch key section A pulse signal is input to RO R3 terminal while one of G 5 line keys on key matrix is touched R 2397 Pin No Signal Description 41 P15 Segment data signal Signal similar to P17 Key strobe signal Signal applied to touch key section A pulse signal is input to RO R3 terminal while one of G 4 line keys on key matrix is touched P14 P13 Segment data signal Signal similar to P17 P12 Segment data signal Signal similar to P17 Key strobe signal Signal applied to touch key section A pulse signal is input to RO R3 terminal while one of G 8 line keys on key matrix is touched Segment data signal Signal similar to P17 Key strobe signal Signal applied to touch key section A pulse signal is input to RO R3 terminal while one of G 7 line keys on key matrix is touched P10 Segment data signal Signal similar to P17 P07 P06 Segment data signal Signal similar to P17 POS Digit selection signal The relation between digit signal and digit are as follows eL Normally one pulse is output
54. ial and final water temperature so that the maximum difference between the final water temperature and the ambient temperature is 5K 5 Select stirring devices and measuring instruments in order to minimize addition or removal of heat 6 The graduation of the thermometer must be scaled by 0 1 at minimum and can be accurate thermometer 7 The water load must be 100025 g 8 t is measured while the microwave generator is operating at full power Magnetron filament heat up time is not included NOTE The operation time of the microwave oven is t 3 sec 3 sec is magnetron filament heat up time Therefore total reheating time 28 seconds Measuring method 1 Measure the initial temperature of the water before the water is added to the vessel Example The initial temperature T1 11 C 2 Add the 1 litre water to the vessel Place the load on the centre of the shelf Operate the microwave oven at HIGH for the temperature of the water rises by a value A T of 10 2 K Stir the water to equalize temperature throughout the vessel Measure the final water temperature Example The final temperature T2 21 C Calculate the microwave power output P in watts from above formula RO NO 10 PROCEDURE LETTER R 2397 TEST PROCEDURES COMPONENT TEST initial temperature tate ded T1211 C Temperature after 25 3 28 sec
55. in Processor This is a one chip microcomputer responsible for controlling the entire control unit IC2 Memory Processor This is a memory IC responsible for memory func tion Display Circuit This is a circuit for driving display tubes by output Key Input Circuit This is a circuit for transmitting key input information to IC1 Sound body Driving Circuit This is a circuit for driving sound body by IC1 output 10 Relay Driving Circuit This is a circuit for driving output relay by IC1 output 11 Stop Switch Circuit This is a circuit for driving IC1 to detect door opening closing 12 Exhaust Air Temperature Detecting Circuit This is a circuit for transmitting output change of thermistor Exhaust Air Temperature Sensor to IC1 13 High Voltage Monitoring Circuit This circuit detects problems in the magnetron high voltage circuit by sensing a variation in the current flowing through the primary winding of the high volt age transformer During heating the primary current of the high voltage transformers also flows through the primary winding of the current transformers CT1 and CT2 This causes a current to be induced in the secondary windings of CT1 CT2 and results in an AC voltage which is determined by R61 R62 This AC voltage is then half wave rectified by D61 D62 and smoothed filtered by C61 C62 This AC voltage is the input to the IN3 and IN5 ports of IC1 which determines ifthere is a magnetr
56. inet Discharge the HV capacitor before carrying out any further work 10 Do not operate the oven with the outer case removed N B Step 1 2 and 9 form the basis of the 3D checks CAUTION DISCHARGE HIGH VOLTAGE CAPACI TOR BEFORE TOUCHING ANY OVEN COMPONE WIRING NG A Special screw Screw Driver Type LHSTIX DLR4 100T HIGH VOLTAGE COMPONENTS REMOVAL High Voltage Capacitor and High Voltage Rectifier Assembly To remove the components proceed as follows 1 CARRY OUT 3D CHECKS 2 Remove two 2 screws holding earth side terminals of high voltage rectifier assemblies 3 Disconnect all the leads and terminals of high voltage rectifier assembly from high voltage capacitor 4 Remove two 2 screws holding capacitor holder to the right side of oven cavity and remove the capacitor holder 5 Now high voltage rectifier assembly should be free 25 CAUTION 1 DONOT REPLACE ONLY HIGH VOLTAGE REC TIFIER WHEN REPLACE IT REPLACE HIGH VOLTAGE RECTIFIER ASSEMBLY 2 WHEN REPLACING HIGH VOLTAGE RECTIFIER ASSEMBLY ENSURE THAT THE CATHODE EARTH CONNECTION IS SECURELY FIXED TO THE CHASSIS WITH A EARTHING SCREW 6 Now the two 2 high voltage capacitors are free R 2397 MAGNETRON REMOVAL Remove the outer case cabinet referring to OUTER CASE REMOVAL and CARRY OUT 3D CHE
57. kage around the door with an approved microwave survey Door release lever Latch head Monitor switch 2 Latch hook 2nd latch switch Joint lever 1st latch switch itch Latch lever Stop switc Latch head 3rd latch switch meter Refer to Microwave Measurement Procedure Figure C 4 Latch Switch Adjustments R 2397 DOOR REPLACEMENT AND ADJUSTMENT DOOR REPLACEMENT 1 CARRY OUT 3D CHECKS 2 Remove four 4 screws holding the upper and lower oven hinge to the oven cavity 3 Remove door assembly with upper and lower oven hinges by pulling it forward On re installing new door assembly secure the upper and lower oven hinges with the four 4 mounting screws to the oven cavity Make sure the door is parallel with bottom line of the oven face plate and the latch head pass through the latch holes correctly 5 CARRY OUT 4R CHECKS Note After any service to the door the approved microwave survey meter should be usedto assure in compliance with proper microwave radiation standards Refer to Microwave Measurement Procedure 4 DOOR ADJUSTMENT When removing and or loosening hinges such as in door replacement the following adjustment criteria are taken Door is adjusted to meet the following three conditions by keeping screws of hinge loose 1 Adjust door latch heads at a position where they smoothly catch the latch hook through t
58. l open and the line voltage to the control unit will be cut off and the operation of the oven will be stopped The defective thermal cut out must be replaced with a new rated one BLOWER MOTOR BM The blower motor drives a blade which draws external cool air This cool air is directed through the air vanes surrounding the magnetrons and cools the magnetrons This air is channelled through the oven cavity to remove steam and vapours given off from the heating foods It is then exhausted through the exhausting air vents at the oven cavity STIRRER MOTOR SM The stirrer motor drives a stirrer antenna to stir the microwave radiation from the waveguide R 2397 SERVICING WARNING TO SERVICE PERSONNEL Microwave ovens contain circuitry capable of producing very high voltage and current Contact with following parts will result in electrocution High voltage capacitor High voltage transformer Magnetron High voltage rectifier assembly High voltage harness REMEMBER TO CHECK 3D REMEMBER TO CHECK 4R 1 Disconnect the supply 1 Reconnect all leads removed from components 2 Door opened and wedged open during testing 3 Discharge high voltage capacitor 2 Replace the outer case cabinet 3 Reconnect the supply WARNING AGAINST THE CHARGE OF THE 4 Run the oven Check all functions HIGH VOLTAGE CAPACITOR Microwave ovens should not be run empty To test for The high voltage capacitor remains charged the presence of microwave energy withi
59. m Resistor 20k ohm Resistor 39k ohm Resistor 10k ohm Resistor 1 5k ohm Resistor 1 5k ohm F Resistor 1 0k ohm Resistor 300k ohm Resistor 47k ohm Resistor 100 ohm Resistor 30k ohm Resistor 1 1k ohm Resistor 20k ohm Resistor 3 3k ohm Resistor 47k ohm 4710 Resistor 470 ohm HF390J Resistor 39 ohm 1530 Resistor 15k ohm EF4720 Resistor 4 7k ohm EF 682d Resistor 6 8k ohm EF105d Resistor 1 0M ohm EF822J Resistor 8 2k ohm EF363F Resistor 36k ohm RY1 LY 0780 0 Relay OJ SH 118LM RY3 4 LY A059DREO Relay VS14MB NR SH6 5 1 RALM A003DREO Buzzer PS3025P02 T1 RTRNPAO80DREO Touch control transformer CTI 2 RTRN AO060DREO Current transformer VRS1 H VZAO1ODREO Varistor TNR15G471K HEHZ12C1 1 Zener diode HZ12C1 HEHZ4C3 1 Zener diod HZ4C 3 PNLCB159WRKO Control panel frame with key unit assembly UNTKA685WREO Key unit DECAA193WRPO Decoration metal fittings ANGTA243WRWO Control panel mounting angle EPSD30P10XS0 Screw control unit mounting EPSD40P12000 Screw control panel mounting angle mounting HTSD40P08TVO Screw decoration panel mounting for earth PCUSUA303WREO Water proof cushion ES OO OO 00 0 e e e e e e e 25B953 2SA1561TL KRA101M KRA101M 2SB910M TA114YS lt lt 2 lt lt lt lt lt lt lt lt lt D D D N o I N zz 2 S23 2 gt
60. n a cavity place about 60 seconds after the oven has been a cup of cold water on the oven tray close the door and switched off Wait for 60 seconds and then short press Manual Repeat key and set the microwave time circuit the connection of the high voltage capacitor for one 1 minute Set the power level to 100 and push thatis of the connecting lead of the high voltage the START button When the one minutes has elapsed rectifier against the chassis with the use of an timer at zero carefully check that the water is now hot insulated screwdriver If the water remains cold carry out 3D checks and re examine the connections to the component being tested Sharp recommend that wherever possible fault finding is carried out with the supply disconnected It may in Some cases be necessary to connect the supply after the outer case has been removed in this event carry out 3D checks and then disconnect the leads to the primary of the high voltage transformer Ensure that these leads remain isolated from other components and the oven chassis Use insulation tape if necessary When the testing is completed carry out 3D checks and reconnect the leads to the primary of the high voltage transformer When all service work is completed and the oven is fully assembled the microwave power output should be checked and microwave leakage test carried out TROUBLESHOOTING GUIDE When troubleshooting the microwave oven itis helpfulto IMPORTAN
61. n door is opened Blower and stirrer motors work Blower motor does not work when door is opened Oven lamp lights and stirrer motors work 1 appear in display 2 appear in display 3 appear in display EE 6 appear in display EE 7 appear in display EE 9 appear in display Oven lamp blower motor and stirrer motor do not work Oven lamp does not work Blower motor does not work Oven does not stop after end of cooking cycle or when STOP CLEAR key is touched Ovenlamp blower motor and stirrer motor stop oh Home fuse blows when starting the oven CONDITION Oven goes into cook cycle but shuts down before end of cooking cycle Oven seems to be operating but no heat is produced in oven load It passed more than 1 minute after cooking but oven lamp blower motor and stirrer motor do not stop EE 0 appear in display EE 16 appear in display EE 17 appear in display EE 8 appear in display EE 10 appear in display Stirrer motor does not work R 2397 LINN VNNALNV YIYYILS Q3390 18 SIH SI HOLSIINH3H L NOH L3NOVNN 40 FYUNLVYHIdNIL SIH SI HOLSIINH3H L IMVINI SYNLVYEIANIL SIH SI HOLSINYIHL 15 40 MI013NNYHYDOUd OL ANG ONDIOOO 13110 LY H3MOd ON H33V43U8 3814 3INOH
62. ng iron with a grounding terminal Oscilloscope Single beam frequency range DC 10MHz type or more advanced model Others Hand tools Other Precautions 1 Before turning on the power source of the control unit 2 3 4 5 remove the aluminium foil applied for preventing static electricity Connect the connector of the key unit to the control unit being sure that the lead wires are not twisted After aluminium foil is removed be careful that abnor mal voltage due to static electricity etc is not applied to the input or output terminals Attach connectors electrolytic capacitors etc to PWB making sure that all connections are tight Be sure to use specified components where high precision is required PROCEDURE FOR CHECKING CLEARING SERVICE COUNTS OF MICROWAVE OVEN The following procedure enables the servicer to obtain the total service counts cook cycles for memory cook ing double quantity cooking and defrost The maximum capacity of the counter is 999 999 counts above which the counter will resetto The counter will retain the total counts will not clear in the event of a power disruption 1 Practice for checking total service counts eg 234 567 Counts flashing gt gt 0 1sec BUZZER PAD DISPLAY INDICATOR LED PHONE Door close NUMBER 1 8268 user total count 2
63. ng the microwave cooking operation DC voltage indicated Defective relay DC voltage not indicated Check diode which is connected to the relay coil If diode is good control unit is defective RELAY SYMBOL OPERATIONAL VOLTAGE CONNECTED COMPONENTS RY1 APPROX 19 0V D C Oven lamp Blower motor and Stirrer motor RY3 APPROX 16 0V D C Power transformer 1 RY4 APPROX 18 0V D C Power transformer 2 CARRY OUT 4R CHECKS 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 onthe PWB this foil pattern acts as a fuse If the foil pattern is open follow the troubleshooting guide given below for repair Problem POWER ON indicator does not light up CARRY OUT 3D CHECKS STEPS OCCURANCE CAUSE OR CORRECTION 1 The rated AC voltage is not present at Check supply voltage and oven power cord POWER terminal of CPU connector CN A 2 The rated AC voltage is present at primary Low voltage transformer or secondary circuit defective side of low voltage transformer Check and repair 3 Only pattern at a is broken Insert jumper wire J24 and solder CARRY OUT 3D CHECKS BEFORE REPAIR 4 Pattern at a and b are broken Insert the coil RCILF2003YAZZ between c and d CARRY OUT 3D CHECKS BEFORE REPAIR NOTE At the time of th
64. ning adhesive on the control panel frame surfaces completely with alcohol 2 When attaching the key unit to the control panel frame adjust the upper edge and right edge of the key unit to the correct position of control panel frame 3 Stick the key unit firmly to the control panel frame by rubbing with soft cloth not to scratch HOW TO RELEASE THE POSITIVE LOCK CONNECTOR Fig 1 Fig 2 Q a TOUCH CONTROL PANEL Y Y M 1 SCREW DRIVER Procedure 1 Pushing the lever of positive lock connector 2 Pull down the connector from the terminal 3 Now the connector is free Note lf the positive lock has a insulation sleeve first remove it If you do not so you can not push the lever of positive lock CAUTION The positive lock terminal can not be dis connected by only pulling Because once you Service personnel have connected the positive lock connector to the terminal the positive lock connector has been locked 27 Terminal Positive lock amp connector NI Lever Figure C 2 How to release the positive lock connector R 2397 POWER SUPPLY CORD REPLACEMENT 1 CARRY OUT 3D CHECKS 4 2 Release the cord bushing from the rear cabinet 5 3 Disconnect the brown and blue wires of the power supply cord from the noise filter 4 Loosenthe single 1 screw holding the earth angle 6 and earth wire of power supply cord 5 Remove the power supply cord CAUTION DO NOT ALLOW THE WIRE
65. nutes 6 MONITOR SWITCH CIRCUIT The monitor switch SW4 is mechanically controlled by oven door and monitors the operation of the 1st latch switch SW1 6 1 When the oven door is opened during or after the cycle of a cooking program the 1st 2nd 3rd latch and stop switches SW1 SW2 SW3 SW5 must open their con tacts first After that the contacts GOM NC of the monitor switch SW4 can be closed 6 2 When the oven door is closed the contacts COM NC of the monitor switch SW4 must be opened first After that the contacts GOM NO of the 1st 2nd 3rd latch and stop switches SW1 SW2 SW3 SW5 must be closed 6 3 When the oven door is opened and the contacts of the 1st latch switch SW1 remain closed remains closed the fuse F2 F6 3A will blow because the monitor switch is closed and a short circuit is caused MICROWAVE VARIABLE COOKING When the microwave oven is preset for variable cooking power the line voltage is supplied to the high voltage transformers T1 T2 intermittently within a 48 second time base through the contacts of the relays RY3 RY4 The following levels of microwaves power are given Number key Number key 9 Number key 8 Number key 7 Number key 6 Number key 5 Number key 4 Number key 3 Number key 2 Number key 1 Az i oi m N N o o R o o o EA o
66. of the oven lamp socket with the flat type small screw driver Lift up the oven lamp socket Now the oven lamp socket is free 26 Oven lamp Socket Flat type small Screw driver Terminal hole Figure C 1 Oven lamp socket R 2397 CONTROL PANEL ASSEMBLY AND CONTROL UNIT REMOVAL CONTROL PANEL ASSEMBLY REMOVAL The complete control panel should be removed for re placement of components To remove the control panel proceed as follows 1 CARRY OUT 3D CHECKS 2 Remove the air intake filter assembly from the base plate 3 Remove two 2 screws holding the control panel to the base plate 4 Pull down the control panel and remove it forward 5 Disconnect two connectors A B D H and TAB terminal TAB1 2 3 4 from the control unit 6 Now the control panel assembly is free CAUTION FOR TOUCH CONTROL PANEL REMOVAL 1 Hold the lower end Position A Fig 1 of the touch control panel assembly firmly while sliding it down and toward you DO NOT FORCE THE CONTROL UNIT TO SLIDE DOWN DURING REMOVAL THIS MAY CAUSE DAM AGE TO THE CONTROL UNIT BY HITTING A RELAY RY 4 OR THE TAB TERMINALS LOCATED AT THE FRONT OF THE OVEN CAVITY 2 If the Touch Control Panel is hard to remove 1 Insert a flat head screw driver into space Fig 1 2 Rotate the screwdriver clockwise while holding posi tion C of the Touch Control Panel Fig 2 TO AVOID DAMAGE TO TOUCH CONTROL PANEL COVER THE TIP OF S
67. ollowing 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 the pads sometimes a pad produces no signal 2 Control Unit The following symptoms may indicate a defective control unit Replacing the control unit 2 1 Programming problems a When touching the pads a certain group of pads do not produce a signal 2 2 Display problems For a certain digit all or some segments do not light up b For a certain digit brightness is low Only one indicator does not light 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 9 The figure of all digits flicker 2 3 Other possible problems caused by defective control unit a Buzzer does not sound or continues to sound b Cooking is not possible Note When defective components the Control Unit or Key Unit are replaed 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 KEY UNIT TEST If the display fails to clear when the STOP CLEAR pad is depressed first verify the flat ribbon is making good contact verify that the door sensing switch stop switch operates properly that is the contacts are closed when the door is closed and open when the door is open If the doo
68. on high voltage problem HIGH VOLTAGE TRANSFORMER HIGH VOLTAGE CIRCUIT MAIN BODY SIDE ce CT1 or CT2 loo T C SIDE or RY4 321 R61 R65 or R62 R66 NE I gt or 061 063 D62 R64 D64 l INS FORT C61 or C62 Vc Figure T 1 High Voltage Monitoring Circuit 14 Magnetron Temperature Circuit Detect Noload or Fan Lock This is a circuit for transmitting output change of thermistor Magnetron Temperature Sensor to IC1 15 Intake Air Temperature Detecting Circuit This is a circuit for transmitting output change of thermistor Intake Air Sensor to IC1 2 Key Unit The key unit is composed of a matrix circuit in which when a key it touched one of signals P11 P12 P15 P16 and P17 generated by the LSI is passed through the key and returned to the LSI as one of signals RO R3 This model has 20 Memory pads When the oven is shipped Memory pad 1 to 10 are set as follows fig 1 Memory No Cook Time Output Power 1 5566 100 2 0 10095 3 20sec 10096 4 30sec 10096 5 40sec 10096 6 50sec 100 7 1min 10096 8 1min 15sec 10096 9 1min 30sec 10096 10 2min 100 fig 1 This model has a double quantity pad When the oven is shipped Magnification 1 8 is preset in the double quantity pad This model has an
69. r a z 3 0 I WOZZSSI 031512395 LON 31 1 ES 969 031310995 LON 31 029 LINN A9L 0029 367 GLA MONO0HLSI 149 780 6 X 9S1 101H 6H 5371814 80 ua9r9vzi MOL YOLOW zr y HOLON H3MO 18 Vv Moe er SAP LIVLIG 080 MOL S v 221 8 y POOPZIV WIOLVEM 77 020 web LAW 14 11991762 lt 17 SG A gd 59 LOZIZH 5
70. r sensing switch stop switch is good disconnectthe flat ribbon cable that connects the key unit to the control unit and make sure the door sens ing switch is closed either close the G8 G7 G6 G5 G4 G3 G2 G1 door or short the stop switch con nector Use the key unit matrix 557 gt Q x Lm indicated on the control panel sche D Q z v r la 8 matic and place a jumper wire be tween the pins that correspond to p 1 3 5 9 the STOP CLEAR pad making mo 812 2 4 6 0 mentary contact KEY UNIT R 2397 TEST PROCEDURES CONT D PROCEDURE LETTER COMPONENT TEST If the control unit responds by clearing with a beep the key unit is faulty and must be replaced If the control unit does notrespond itis faulty and must be replaced If a specific pad does not respond the above method may be used after clearing the control unit to determine if the control unit or key pad is at fault RELAY TEST CARRY OUT 3D CHECKS Remove the outer case and check voltage between Pin Nos 5 and 7 ofthe connector A on the control unit with an A C voltmeter The meter should indicate 230 volts if not check control unit circuity and RY4 Relay Test These relays are operated by D C voltage Check voltage at the relay coil with a D C voltmeter duri
71. rmer is probably faulty and should be replaced CARRY OUT 4R CHECKS HIGH VOLTAGE RECTIFIER ASSEMBLY TEST HIGH VOLTAGE RECTIFIER TEST CARRY OUT 3D CHECKS Isolate the high voltage rectifier assembly from the HV circuit The high voltage rectifier can be tested using an ohmmeter set to its highest range Connect the ohmmeter across the terminal B C of the high voltage rectifier and note the reading obtained Reverse the meter leads and note this second reading The normal resistance is infinity in one direction and more than 100 in the other direction CARRY OUT 4R CHECKS ASYMMETRIC ASYMMETRIC RECTIFIER TEST ASYMMETI CARRY OUT 3D CHECKS C HIGH VOLTAGE RECTIFIER R 2397 PROCEDURE LETTER TEST PROCEDURES COMPONENT TEST Isolate the high voltage rectifier assembly from the HV circuit The asymmetric rectifier can be tested using an ohmmeter set to its highest range Contact the ohmmeter across the terminals of the asymmetric rectifier and note the reading obtained Reverse the meter leads and note this second reading If an open circuit is indicated in both directions then the asymmetric rectifier is good If an asymmetric rectifier is shorted in either direction then the asymmetric rectifier is probably faulty and must be replaced with high voltage rectifier When the asymmetric rectifier is defective check whether magnetron high voltage rectifier high voltage wire or filament winding of the hi
72. ry OPERATING SEQUENCE customer service FUNCTION OF IMPORTANT CAUTION COMPONENTS MICROWAVE RADIATION DO NOT BECOME EXPOSED TO RADIATION FROM THE MICROWAVE GENERATOR OR OTHER PARTS SERVICING AND CONDUCTING MICROWAVE ENERGY TROUBLESHOOTING CHART WARNING TEST PROCEDURE Note The parts marked are used in voltage more than 250V Parts List Anm Delar market med har en spanning TOUCH CONTROL PANEL verstigande 250V ASSEMBLY Huom Huolto ohjeeseen merkitty t hdella osat joissa j nnite on yli 250 V COMPONENT REPLACEMENT AND Bemerk Deler som er merket asterisk er utsatt for ADJUSTMENT PROCEDURE spenninger over 250V til jord Bem rk Dele m rketmed stjerne benyttes med h jere sp nding end 250 volt MICROWAVE MEASUREMENT WARNING Never operate the oven until the following points are ensured TEST DATA AT AGEANCE A The door is tightly closed B The door latches and hinges are not defective C The door is not deformed or warped D There is not any other visible damage with the oven WIRING DIAGRAM Servicing and repair work must be carried out only by trained service engineers Removal of the outer wrap gives occess to potentials above 250V PARTS LIST All the parts marked A on the parts list may cause undue microwave exposure by themselves or when they are dam aged loosened or removed SHARP CORPORATION OSAKA JAPAN R 2397 PRODUCT DESCRIPTION SPECIFI
73. the mag netron filament and the high voltage 2000 volts is sent to the voltage doubling circuit where it is doubled to negative voltage of approximately 4000 volts D C 3 The 2450 MHz microwave energy produced in the magnetron generates a wave length of 12 24 cm This energy is channelled through the waveguide transport channel into the oven cavity where the food is placed to be cooked 4 When the cooking time is up a signal tone is heard and the relays RY3 RY4 go back to their home position The circuits to the high voltage transformers T1 T2 The relay RY1 remains and oven lamp blower motor and stirrer motors work for 1 minute 5 When the door is opened during a cook cycle the switches come to the following condition CONDITION DURING DOOR OPEN SWITCH CONTACT COOKING NO COOKING 1st latch switch COM NO Closed Open Monitor switch COM NC Open Closed 2nd latch switch Closed Open Stop switch COM NO Closed Open 3rd latch switch Closed Open The circuits to the high voltage transformers T1 T2 are cut off when the 1st latch 2nd latch 3rd latch and stop switches SW1 SW2 SW3 SW5 are made open The blower motor BM stirrer motors and oven lamp remains on even if the oven door is opened after the cooking cycle has been interrupted because the relay stays closed Shown in the display is the remaining time but the program is cancelled if the oven is not started within 3 mi
74. ut out Mag Thermal cut out Blower motor 115 C Thermal cut out Oven Thermistor Exhaust 115 C Approx 77 45kQ at 15 C 61 47KQ at 20 C 49 12KQ at 25 Thermistor Intake Approx 15 8kQ at 15 C 13 03KQ at 20 C 10 74KQ at 25 C Thermistor Magnetron Monitor resistor Approx 15 91kQ at 15 C 13 04KQ at 20 C 10 74KQ at 25 C 4 3Q 20W Oven lamp 250V 25W High voltage capacitor 1 07uF AC 2100V High voltage capacitor 1 07uF AC 2100V High voltage transformer Filament winding 10 Secondary winding Approx 57 30 Primary winding Approx 1 060 High voltage transformer Filament winding 10 Secondary winding Approx 57 30 Primary winding Approx 1 060 Magnetron Filament winding 10 Filament winding chassis Q Magnetron Filament winding 10 Filament winding chassis Q TEST POINT ON CONTROL UNIT In Out pit terminal Test Point Resistance Disconnect the power plug and close the door Input terminal Power suplly 5 A7 Approx 7900 Output terminal Stop switch B1 B2 0 Output terminal Oven lamp Blower motor 1 A7 Stirrer motor Approx 2250 Output terminal Earth B1 Chassis 0 WARNING DISCONNECT THE PLUG WHEN MEASURING RESISTANCE 31 R 2397 SCHEMATIC NOTE CONDITION OF OVEN 1 DOOR CLOSED 2 APPEARS ON DISPLAY NOTE INDICATES COM

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