Sharp R-8320E Service Manual
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Sharp R-8320E Service Manual

Sharp R-8320E Service Manual

Convection microwave oven
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SHARP
SERVICE MANUAL
9
KASMY82101 R J'M
SHARP
CONVECTION MICROWAVE OVEN .
R-8320E
In the interest of user-safety the set should be restored to its original
condition and only parts identical to those specified be used.
SHARP
CORPORATIOltl
l

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  • Page 1 SHARP SERVICE MANUAL KASMY82101 R J’M SHARP CONVECTION MICROWAVE OVEN . R-8320E In the interest of user-safety the set should be restored to its original condition and only parts identical to those specified be used. SHARP CORPORATIOltl...

  • Page 2: Foreword

    R-8320E ‘,.rx.:. OPERATING ^ I__ .” x ,” ;,; INSTRUCTIONS FOREWORD This Manual has been prepared to provide Sharp Service Personnel with complete Operation and Service Information for the Sharp Convection Microwave Oven, R-8320E. kg&$ I :I ,,~T*gg OPERATION It is recommended that service personnel carefully study the entire text of this Manual so they will be qualified to render satisfactory customer service.

  • Page 3: Table Of Contents

    TABLE OF CONTENTS Page FOREWORD ..............l CAUTION, MlROWAVE RADIATION...
  • Page 4 ..$4 HeaterRelay............StopSwitch..............4 Door Open Mechanism............Convection Cooking System ..........HeatingElement............4 Upper and Lower Latch Switches..........Monitor Switch (Australia Model)..........PowerTransformer............4 Voltage Doubler Circuit ............. MagnetronTube............4 ............Damper Operation. RelayUnit...............4 CHAPTER IV SERVICING ............5 1 Troubleshooting Guide.
  • Page 5 ..CHAPTER VI COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE Warning..............g Outer Case Removal............High Voltage Components Removal ..........Relay Unit, Cook Relay or Heater Relay Removal........Turntable Motor Removal............Magnetron Assembly Removal............. Cooling Fan Motor Removal ............I00 Convection Motor Removal.

  • Page 6: Chapteri Product Description

    EXPLANATION OF MICROWAVE COOKING AND CONVECTION COOKING Materials with a high moisture content, like most foods, The Sharp Convection-Microwave oven uses microwave will absorb microwave energy. As the microwave energy, energy and the sheath heater to produce heat in the food to at a frequency of 2,450 Megahertz enters the food, the be cooked.

  • Page 7: Operating Instructions

    FIRST SEQUENCE SECOND SEQUENCE THIRD SEQUENCE Microwave Microwave Microwave Microwave Microwave Convection Convection Microwave Preheat Convection Preheat Convection Convection Preheat Auto Mix Preheat Convection Microwave Check your Sharp Carousel Convection Microwave Cookbook for ideas on when to use multiple sequence cooking.

  • Page 8: Auto-Touchtm Control Panel

    AUTO-TOUCHm CONTROL PANEL FAN SYMBOL XONVECTION LIGHTED DIGITAL DISPLAY Shows readout of cooking time, convection temperature or time of day. AUTO INDICATORS Indicator lights for Convection (CONV), Variable Cooking, Cook, Mix, Memory (MEM) and Auto Start (AUTO). PROGRAM SELECTOR PADS Touch to set Auto Start/Clock, Memory Entry and Memory Recall.

  • Page 9: Auto-Touchtm Operation Check

    AUTO-TOUCHTM OPERATION CHECK Clock 1. Plug the power cord into a three-pronged electrical outlet (240V for Australia/220V for South Africa, 50Hz, 10 amp or more, AC only). 2. The digital display will show 88:88 and flash on and off every second. Touch the CLEAR pad once and 1-1 will appear.

  • Page 10: Operation For Clock Setting

    OPERATION FOR CLOCK SETTING This oven functions as a clock to keep the time of day. To set the clock, follow this procedure. When oven is plugged in, the display will show-f:, flashing on and off every second. Touch the CLEAR pad;...

  • Page 11: Operation For Microwave Cooking

    3. The Variable Cooking Control on your Sharp Convection Microwave Oven allows you to select the amount of microwave energy and the rate of cooking or defrosting. There are four levels or settings for cooking: HIGH, MED HIGH, MED and MED LOW/DEFROST.
  • Page 12 Some foods give best results when cooked more slowly at a lower cooking power. Your cookbook will indicate the recommended variable setting for each recipe. See your Sharp Carousel Convection Micro- wave Cookbook for guidelines on how to use the Variable Cooking Control.
  • Page 13 To Cook at Multiple Sequence Suppose you want to program the oven to cook at HIGH and reduce to MED HIGH. Check the microwave recipe section of This Carousel Convection Microwave Cookbook for ideas on when to use multiple sequence cooking. You can set 4 sequences. * Suppose you want to roast beef for 5 minutes at HIGH, and then continue to cook for 30 minutes at MED HIGH.

  • Page 14: Introduction To Convection Cooking

    ACCESSOR!ES The following accessories were designed especially for use in the Sharp Convection Microwave Oven. The racks are for convection or combination cooking only; do not use for microwave cooking alone. Do not substitute similar types of racks for these specially designed ones.

  • Page 15: Convection Broiling

    5. Hot dogs cooked on the broiling trivet may be turned over to give an even, grilled appearance. Recommended Broiling Utensils Sharp recommends only the use of the metal Carousel turntable, and the broiling trivet and baking rack accessories that are included with the oven,...

  • Page 16: Mixcooking

    MIX ROASTING Mix roasting in the Sharp Convection Microwave Oven is a simple task when you follow the instruc- tions given below. The results are juicy, crisp browned meats done to your liking.

  • Page 17: Mixbaking

    MIX B A K I N G Baking with the Sharp Convection Microwave Oven is fast and simple. Using convection heat first gives baked goods their structure and, of course, their browned appearance; finishing with microwaves cooks the inside to a perfect doneness in a shorter time.

  • Page 18: Operation For Convection Cooking

    OPERATION FOR CONVECTION COOKING This oven can also be used for both Convection and Automatic Convection Microwave Cooking. During convection heating, hot air is circulated throughout the oven cavity to brown and crisp foods quickly and evenly. The oven should not be used without the metal turntable in place and it should never be restricted so You may remove the turntable when preheating the oven or when preparing that it cannot rotate.
  • Page 19 To Cook by Convection This Au to-Touch Convection Microwave Oven can be programmed for ten different convection cooking temperatures for up to 99 minutes, 99 seconds. * Suppose you want to cook at 200°C for 25 minutes. Pad Order Display Procedure Step Enter desired cooking time.
  • Page 20 To Preheat and Cook by Convection at the Same Temperature This Convection Microwave Oven can be programmed to combine preheating and convection cooking or preheating and automatic mix cooking operations. * Suppose you want to preheat to 180” C and bake biscuits at 180°C for 15 minutes. Pad Order Display Step...
  • Page 21 To Preheat and Cook by Convection at a Different Temperature + Suppose you want to preheat to 200°C and bake a cake at 180°C for 40 minutes. Procedure Pad Order Display Step Touch Convection pad. p&q ‘-‘“C 2. Touch desired preheat tempera- ture pad.

  • Page 22: Operation For Mix Cooking

    The convection temperature setting of either pad can be changed to accomodate a wide variety of foods. See your Sharp Carousel Convection Microwave Cookbook for complete cooking information. To Cook by Mix Settings + Suppose you want to roast lamb for 50 minutes on HIGH MIX/ROAST.
  • Page 23 To Change Convection Temperature of Mix Settings LOW MlXrSAKE You may want to change the preprogrammed temperature of or HIGH MIX/ ROAST settings. Check your Sharp Carousel Convection Microwave Cookbook for ideas on when to change the temperature. SUPPOSE LOW MIX/BAKE 180°C changing from 150”~.
  • Page 24 To Preheat and Cook by Mix Settings This Convection Microwave Oven can be programmed to combine preheating and automatic mix cooking operations. You will want to preheat at the same temperature as the automatic mix tempe- rature; that is 150°C for the LOW MIX/BAKE setting or 200°C for the HIGH MIX/ROAST setting. * Suppose you want to preheat to 200°C and bake an apple pie for 35 minutes at HIGH MIX/ROAST 200”...

  • Page 25: Operation For Special Function Cooking

    * Suppose you want to broil a steak for 15 minutes. Display Pad Order Procedure Step Enter maximum broiling time using convection broiling chart in your Sharp Carousel Convection Microwave Cookbook. 2. Touch BROIL pad. (Ex.) Oven temperature is lower 3. Touch COOK pad. than 40°C. Convection Fan Symbol will flash on and off.
  • Page 26 The SLOW COOK setting is preset for 130°C for 4 hours. It is designed for foods which cook longer than 99 minutes, 99 seconds at 130°C or less. Foods such as baked beans or marinated chuck steak best cooked slowly at low temperatures. SLOW COOK feature expands the lengthof cooking time to a maximum of 4 hours at 130°C or lower.
  • Page 27 The PROOF cycle is designed for raising or proofing bread dough. It is preset at 40°C for 30 minutes. See the Convection Microwave Baking and Dessert section of your Sharp Carousel Convection Micro- wave Cookbook for proofing directions. * Suppose you want to proof dough of loaf bread.

  • Page 28: Operation For Auto Start Cooking

    OPERATION FOR AUTO START COOKING program your oven If YOU wish to to automatically begin cooking at a designated time of day, a limit of time setting is maximum 12 hours. * Suppose you want to start cooking a roast for 50 minutes on HIGH MIX/ROAST at 4:30 p.m. Before setting, check to make sure the clock is showing the correct time of day.
  • Page 29 NOTE: The Auto Start feature can be used for any of the programs described on the previous pages, including: 1) cooking by time using the Variable Cooking Control 2) multiple sequence cooking 3) defrosting 4) convection cooking 5) memory cooking To Check Auto Start Time Once you have correctly programmed the oven for Auto Start, the correct time of day (not the Auto Start time) will appear on the display.

  • Page 30: Operation For Memory Cooking

    OPERATION FOR MEMORY COOKING This Microwave Oven has one memory bank to allow you to preset one frequently used cooking program. The oven “memorizes” these instructions and can recall this information whenever needed. This feature can be used for frequently prepared foods such as scrambled eggs, heating coffee or baby It can also be used for more complicated multiple bottles or special recipes children like to cook.
  • Page 31 1 To Cook by Memory 1 To use the information stored in the memory bank. * Suppose you have already stored the cooking program 2 minutes 20 seconds at MED HIGH in the memory bank. Display Pad Order Procedure Step Touch MEMORY RECALL pad.

  • Page 32: Chapter Ill Operation

    CHAPTER Ill OPERATION NORMAL COOKING SEQUENCE 3. Touch the “COOK” pad. MICROWAVE COOKING The Convection Fan Symbol on display will flash on and off, and display will show LO C. 1, Place the food to be cooked in the oven and close the The COOK indicator will glow indicating the oven is in door firmly.

  • Page 33: 1. High Cooking

    MICROWAVE COOKING CONDITION 1. HIGH COOKING l-l 1. The monitor switch is electrically monitoring the Program desired cooking time and Variable Cooking operation of the upper latch switch and is mecha- Control by touching the NUMBER pads and the “HIGH” nically associated with the door so that it will pad of the Variable Cooking Control.

  • Page 34: Convection Cooking Condition

    CONVECTION COOKING CONDITION CONVECTION COOKING CONDITION PREHEATING CONDITION When the preheat temperature is reached, a beep signal Program desired convection temperature by touching the will sound four times indicating that the holding tempe- “CONVECTION” pad and the temp. pad. rature has been reached in the oven cavity, open the door When the “COOK”...

  • Page 35: Automatic Mix Cooking Condition

    AUTOMATIC MIX COOKING CONDITION 6. When the oven temperature reaches the selected Program desired cooking time and temperature by touch- temperature, the following operations occur: ing the number pads and the “LOW MIX/BAKE” or “HIGH 6-l. The 240 volts A.C. is supplied to the heating MIX/ROAST”...
  • Page 36 240-50Hz /7 n C-IVFN AbjfJ v-h.- -,,a. FUSE MlOA U P P E R LATCH MONITOR SWITCH 1 SWITCH TURNTABLE LOWER MOTOR LATCH SWITCH STOP T H E R M ISTt MAGNETRON THERM0 CUT-OUT I SWITCH I DAMPER H E A T E R iCOOK 1 MOTOR ,RELAY IRELAY...
  • Page 37 240%50Hz FUSE MlOA I-URNTABLE LOWER ‘/lOTOR LJTCH SWITCH STOP THERMISTO MAGNETRON THERM0 CUT-OUT , DAMP% - -J 1 SWITCH I DAMPER iHEATER iCOOK I MOTOR ,RELAY IRELAY s - m - - SCHEMATIC NOTE: CONDITION OF HEATER RELAY COOK OVEN ELEMENT L ------__ CONTACTS...
  • Page 38 240~50Hz I I I r - - - - - - - 1 FUSE MlOA T U R N T A B L E \ LOWER MOTOR LATCH ) SWITCH STOP TH : , THERMISTOR y MAGNETRON THERM0 b CUT-OUT ,,,,,:;L-J I SWITCH SCHEMATIC...

  • Page 39: Description Of Operating Sequence (South Africa Model)

    DESCRIPTION OF OPERATING SEQUENCE (South Africa Model) l-5 The 220 volts A.C. is supplied to the primary The following is a complete description of component winding of the power transformer and is con- function during the three stages of oven operation. verted to 3.15 volts A.C.

  • Page 40: Convection Cooking Condition

    10-2. The heater relay is de-energized by the dontrol unit temperature circuit and thermistor, open- ning the circuit to the heating element. 10-3. A beep signal will sound four times. MICROWAVE POWER The preheat temperature has been reached. =Approx. 70% At-i 10-4.

  • Page 41: Automatic Mix Cooking Condition

    4. The heater relay is energized. At the end of the convection cook cycle, shut-off re- The 220 volts A.C. is supplied to the heating element. lay (RY4) is energized turning on the damper motor. 5. Now, the oven is in the convection cooking condition. The damper is returned to the open position, closing the damper switch contacts which send a signal to 6.
  • Page 42 220V-50Hz I I I r - - - - - - - LINE BYPASS OVEN LAMP FUSE CAPACITOR J-, MIOA UPPER - FJiss LATCH SWITCH CAPACITOR TURNTABLE LOWER LATCH SWITCH THERMISTOR .MAGNETRON THERM0 CUT-OUT , ,AMP:zL - I SWITCH I DAMPER IHEATER iCOOK ,RELAY...
  • Page 43 220V-50Hz I I I r - - - - - - - 1 LINE FUSE BYPASS MlOA CAPACITOR CAPACITOR T ” n h ’ T A n ’ r -M--, f I UlllY I HISLIZ MOTOR LATCH ) SWITCH STOP SWITCH H2r -1 IT’T- THERMISTO...
  • Page 44 220V-50Hz r - - - - - - - LINE B Y P A S S 1 FUSE CAPACITOR MlOA LINE --IL BYPASS CAPACITOR TURNTABLE LOWER LATCH SWITCH SWITCH H2-- - 1 THERMISTOF MAGNETRON THERM0 CUT-OUT -4 i IKT-““‘I llK:TAY I ‘-1 1 1 1 ;...

  • Page 45: Description And Function Of Components

    DESCRIPTION AND FUNCTION OF COMPONENTS OVEN LAMP HEATER RELAY The oven cavity lamp illuminates the interior of the oven The heater relay is mounted on the back portion of the so that the food being cooked can be examined visually relay chassis.

  • Page 46: Convection Cooking System

    HEATING ELEMENT CONVECTION COOKING SYSTEM The heating element is located above the top of the oven This oven is designed with a hot air heating system where food is not directly heated up by the heating element, but cavity as illustrated in Figure 8. It is intended to heat air is instead heated by forced circulation of the hot air pro- driven by the convection fan.

  • Page 47: Monitor Switch (Australia Model)

    The 2400 volts A.C. voltage is fed to the voltage doubler MONITOR SWITCH (AUSTRALIA MODEL) circuit. The monitor switch mounted on the upper latch hook is activated (the contacts opened) by the latch head on the VOLTAGE DOUBLER CIRCUIT door while the door is closed. This switch is intended to The voltage doubler circuit consists of a rectifier and a render the oven inoperative by means of blowing the fuse capacitor.

  • Page 48: Damper Operation

    DAMPER OPERATION l-2. Contacts of shut-off relay (RY4) close and supljly Usually, the damper is open position except during the 220/240 volts A.C. to the damper motor. The damper motor is energized, opening the damper convection cooking. Damper position is set automatically by damper motor, door.

  • Page 49: Relayunit

    RELAY UNIT The relay unit is composed of transformer, buzzer, relays, 2. During microwave cooking, the signal of terminal Dl, printed wiring board, etc. D2 and 04 on LSI (l-l) goes to “H” level and shut-off This unit generates voltage necessary in the control unit relays (RY2 and RY3) are energized.
  • Page 50 OR “D’ CONNEC’ XTOR DESCRIPTION --m- --m- Pin No. Cook relay, heater relay and shut-off relays driving voltage. When the driver IC (IR-2403) is turned on by the “H” level signal from the LSI (l-l), cook relay, heater relay and shut-off relays are energized by this driving voltage.
  • Page 51 POWER SUPPLY 4VDD 220/240\ 50Hz D C - D C -” CONVERTER FUSE Heater of display tube 1 1-3 (lR2403) A - l 8.2K A683f TURNTABLE I 37 MOTOR ’ & MOTOR (DAMPER)1 RELAY UNIT CONTROL UNIT Figure 14...

  • Page 52: Servicing

    CHAPTER IV SERVICING TROUBLESHOOTING GUIDE When troubleshooting the convection microwave oven, it IMPORTANT (Australia model only) is helpful to follow the sequence of Operation in perform- : If the oven becomes inoperative because of ing the checks. a blown fuse in the upper-monitor switch Many of the possible causes of trouble will require that a circuit, check the upper latch switch and specific test be performed.

  • Page 53: Microwave Cooking Condition

    TROUBLESHOOTING GUIDE (CONT’D) TEST PROCEDURE OR POSSIBLE CAUSE PROBELM CORRECTION MICROWAVE COOKING CONDITION Procedure 0. Oven lamps do not light in cook Defective contacts (A) of shut-off relay (RY2) on relay unit. cycle. (Does light when door is opened) Defective control unit. Procedure L.

  • Page 54: Convection Cooking Condition

    TROUBLESHOOTING GUIDE (CONT’D) TEST PROCEDURE OR PROBELM POSSIBLE CAUSE CORRECTION MICROWAVE COOKING CONDITION (CONT’D) Oven does not cook properly when Defective control unit. Procedure L. programmed for MED LOW/ Defective key unit. Procedure L. DEFROST, MED or MED HIGH cooking powers. Open or loose wiring between above Check and,repair wiring.

  • Page 55: Test Procedures

    TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER MAGNETRON ASSEMBLY TEST DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPONENTS OR WIRING. To test for an open filament, isolate the magnetron from the high voltage circuit. A continuity check across the magnetron filament leads should indicate less than 1 ohm. To test for a shorted magnetron, connect the ohmmeter leads between the magnetron filament leads and chassis ground.

  • Page 56: Power Transformer Test

    TEST PROCEDURES (CONT’D) PROCEDURE COMPONENT TEST LETTER Calculation of output power; Microwave output power ..P (W) = 70 x AT (“C) AT = (ATL + ATR) : average temperature rise ATL = (Q2 - TLJ ATR = (TRY -TRY water temperature after heating in left beaker water temperature before heating in left beaker water temperature after heating in right beaker...

  • Page 57: High Voltage Capacitor Test

    TEST PROCEDURES (CONT’D) PROCEDURE COMPONENT TEST LETTER HIGH VOLTAGE CAPACITOR TEST DISCljARGE THE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPONENTS 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.

  • Page 58: Blownfuse

    TEST PROCEDURES (CONT’D) PROCEDURE COMPONENT TEST LETTER BLOWN FUSE If the fuse in the upper latch switch and monitor switch (Australia) circuit is blown when the door is opened, check the upper latch switch and monitor switch before replacing the blown fuse (Refer to Test Procedure E and G).

  • Page 59: Heating Element Test

    TEST PROCEDURES (CONT’D) PROCEDURE COMPONENT TEST LETTER HEATING ELEMENT TEST Make sure the heating element is fully cooled and test the followings; a. Disconnect wire leads and measure the resistance with an ohmmeter. On the R x 1 scale, the resistance between the heating element terminals should be approximately 9.6 ohms.

  • Page 60: Relayunittest

    TEST PROCEDURE (CONT’D) PROCEDURE COMPONENT TEST LETTER RELAY UNIT TEST The relay unit consists of circuits including-relays, buzzer, transformer, etc. Plug power cord into wall receptacle, the display “88:88” will be flashing. Remove the outer case and check voltage between pins C-l and C-2 on the relay unit with an A.C. voltmeter.

  • Page 61: Touch Control Panel Assembly

    CHAPTER V TOUCH CONTROL ASSEMBLY OUTLINE OF TOUCH CONTROL PANEL The touch control section mainly consists of the following 6) Buzzer Circuit The part responsive to signals from the LSI units as shown in the block diagram. (IX2075YA) to emit audible sounds (key touch (1) Key unit sound and completion sounds).
  • Page 62 BLOCK DIAGRAM INI C- POWER POWER SUPPLY SOURCE < CIRCUIT 220/24OV 50Hz (HI C. --IT- c”kJlT COOK RELAY IMGJ D.C. LINE (GNDI HEATER RELAY (HEATER) CONVECTION - -- Ft- MOTOR fti. FAN) RY-2 TURNTABLE MOTOR (TTMI -_ u- OVEN LAMP RY-3 (0.L.) COOLING...

  • Page 63: Controlunit

    K DIAGRAM INDICATOR CIRCUIT Z--- CONTROL UNIT ,-,i!Jl+b I I I I UNIT --r---l G-l 1 BROIL COOK HIGH CLEAR HIGH DEFROST TlMER ,+$J PROOF STOP ,r-j&-j &, &. , -, - - - -. . IG-aI I-’ HIGH MIXi MEMORYIMEMORY LOW MIX SLOW...

  • Page 64: Description Of Lsi

    DESCRIPTION OF LSI LSI (I-1: IX2107YA) The I/O signals of the LSI (IX2107YA) are detailed in the following tables, IX2107YA XOUT (M58841 024SP) CNVss Figure 16. Relationship between pin Nos. and Signals (LSI: lX2107YA)
  • Page 65 Pin No. Signal Description Connected to GND (0 volt). To change over power source frequency. 60 Hz area: “H” level (OV: GND) 50 Hz area: “L” level (-15V: VDD) Note: Normally connected to “H” level (GND) by jumper wire. To change over temperature indicate mode (“FPC) OF unit: “H”...
  • Page 66 Description Signal Pin No. Signal synchronized with commercial power source frequency. This is the basic timing for all time processing. Signal similar to K5. pj or m key is touched, fggq [lllo”cl] When either one of a corresponding signal will be input into K3. To input a signal which communicates the door open/close information to LSI.
  • Page 67 Description Signal Pin No. Key strobe signal. Signal applied to touch-key section. A pulse signal is generated while 161 , [21 , [ml , [4 ,101, 1-1 or m[Iso”Cll key is being touched. Data output port with respect to R03 terminal of LSI (1-2: IX2075YA). Key strobe signal.

  • Page 68: Lsi (L-L: Ix2075Ya)

    Description Signal Pin No. Oven light and turntable motor driving signal. To turn on and off the shut-off relay (RY2 ). “H” level during both microwave and convection cooking; “L” level otherwise. Heating element driving signal. To turn on and off the heater relay. “H”...
  • Page 69 Description Signal Pin No. Magnetron high-voltage circuit and heating element driving signal. To turn on and off the cook relay by D1 signal and the heater relay by D3 signal. “H” level during cooking condition; “L” level otherwise. 26 sec. HIGH MIX ROAST...
  • Page 70 LSI (l-2: IX2075YA) The I/O signals of the LSI (lX2075YA) are detailed in the following tables. IX2075YA (HD38755A50) INTl INTO VDISP OSCl 1 osc2 1 9 1221 ROO Figure 17. Relationship between pin Nos. and Signals (LSI: IX2075YA)
  • Page 71 Description Signal Pin No. The relation between signals and indicators are as below: Indicator Signal D3 ..ErnM! D4..Ds ..Dg..SS D7..Dg..D9..CONV indicator CONV indicator lights during convection condition.
  • Page 72 Description Signal Pin No. Digit selection signal. The relation between digit signal and digit are as follows: Dight Digit Signal DI1....Colon D12 ....D13 .
  • Page 73 Description Signal Pin No. Similar to D11 To indicate the first digit of Fluorescent Display. Similar to D11 To indicate the second digit of Fluorescent Display. Similar to D11 To indicate the third digit of Fluorescent Display. Similar to Di i To indicate the fourth digit of Fluorescent Display.
  • Page 74 Description Signal Pin No. Signal for lighting MIX, MEM and AUTO indicators. Signal similar to R1 o. Signal for lighting COOK indicator. Normally signal similar Vp. Pulse signal is generated when lighting indicator. GND- msec. 13.2 --1-_ - 4 - L 1.0-1.4 msec.
  • Page 75 Description Signal Pin No. Input isgnal to be used for data reception with respect to D6 terminal of LSI (l-l: lX2107YA). Signal synchronized with commercial power source frequency. This is the basic timing for all time processing. - - - - - - - - ,5v 13.2 msec.

  • Page 76: Power Source Circuit

    POWER SOURCE CIRCUIT When variation of magnetic flux turns to zero, the above Power Source Circuit on Relay Unit steps are repeated and the collector waveform will be as 220/24OV AC is applied to the primary of the tranSfOrmer illustrated in Fig. 19. (T1 ) through a filter circuit consisting of f-1, and Cl.

  • Page 77: Aclcircuit

    p CIRCUIT -----___- _-----_ --------ND Half-wave rectified voltage (VB) from the power source circuit is applied to the base of Q40. The p waveform is generated from the collector of Q42. This is the basic timing for all time processing. Figure 20.

  • Page 78: Thermistor Sensor Circuit

    THERMISTOR SENSOR CIRCUIT Accordingly, the temperature detected by THERMISTOR LSI (lX2107YA) has a built-in A/D converter. Analog DC is input to K 1s (LOW) and Kg (HIGH) input terminal of voltage input to K 13 (LOW TEMP.) or Kg (HIGH TEMP.) terminal is digitally converted into temperature data.

  • Page 79: Indicator Circuit

    CIRCUIT INDICATOR In this model, the Fluorescent Display g-digits, 7-segments Method of Display Indicator element is Fluorescent Display. are used for displaying figures, 6-segments are used for Basically, a Fluorescent Display is a triode having a cathode, Convection Fan Symbol and letters. a grid and an anode.

  • Page 80: Servicing

    Relations of between Digit and Segment Signal. The requirements for display are as follows: 1. Specifying digits. 2. Specifying segments. The following signals are responsible for specifying digits. digit: D12 digit: D13 Colon digit: DI1 digit: D14 digit: D1 s digit: Connected to GND.

  • Page 81: Checker

    CHECKER Table 1 shows the relation between the indicator lamps of The checker is used when repairing or adjusting the touch the checker, energized relays of the relay unit, and LSI control panel assembly and relay unit. (I-1 ) signals. When connectors coming from the checker are connected to respective connectors on the control panel components or relay unit, A.C.

  • Page 82: External Of Checker

    - 5.PIN WIRE CONNECTOR IJI (TO THERMISTORI / - -. \ / BRN 0 , RED PNK.’ ‘,BLK Control Panel Assembly Defective Relay Unit Figure 25. Connectiorr Meted External of Checker CHECKER R-8320E QQQQ8QOI OVEN TURN- COOLING CONVEC HEATER COOK DAMPER 5-PIN LAMP TABLE...

  • Page 83: Checker Circuit Diagram

    Checker Circuit Diagram MAIN SWITCH COOK .‘. HEATER CONVECTION MOTOR TURNTABLE MOTOR I-+ r COOLING FAN MOTOR DAMPER MOTOR 1 .5K DAMPER SWITCH SENSOR R EGU LATOR SWITCH SENSOR DUMMY RESISTANCE HIGH R2 Rl STOP SWITCH Figure- 27 Checker Circuit Diagram...

  • Page 84: Testprogram

    TEST PROGRAM 2) Connect the checker to the panel components, This test program is prepared to check the touch control referring to the “Connection Method”. panel functions, In the event of improper operation, this 3) Turn OFF the main switch of the checker. test program indicates defective places or parts.
  • Page 85 Remarks on Test Program CONV LOW MED M. HIGH HIGH Display and checker Phone : Time of day T.0.D 0 : Key touch sound 0 : Light @ : Completion sound $$ @ : Flashing 0 : Completion sound COOK M E M A U T O : Rotating for preheat temp.
  • Page 86 Remarks on Test Program Display and checker CONV M. LOW MED M. HIGH HIGH Phone &c&h ouo 00 O DO ln T.0.D : Time of day 0 : Key touch sound 97) !I3 Q O UQ UDI 0 : Light @ : Completion sound e (ID : Flashing 0 : Completion sound...
  • Page 87 Remarks on Test Program M. HIGH HIGH M. LOW MED CONV Display and checker Phone &zA u,li u,o O 02 &!g : Time of day T.0.D 0 : Key touch sound wJn) UJ n-u O 1117 n-u : Light @ : Completion sound % @ : Flashing 0 : Completion sound AUTO...

  • Page 88: Troubleshooting Guide

    TROUBLESHOOTING GUIDE 1. g8:8g does not flash This model has the control unit and the separate relay unit, A. Check converter circuit a power supply for driving the control unit. B. Check fl circuit Thus if the control panel operates normally when the test 2.
  • Page 89 From page 87 Opened filament 3 R e p l a c e Flourescend Display Note: To measure resistance, remove pin of fluorescent display fSmoLW9 At the time, don’t apply excessive force to pin glass tube root. terminal (Test Pin) Defective “p circuit”...
  • Page 90 From page 88 Replace See Table 1. Correct soldering. Is C5 faulty or Replace C5. Replace Is ZDl or ZD2 shot-t circuited? . ZD2 Replace . C8 .Cll Table 1 Terminal 1 ,“,;;;z, / Are resistances across See Table 2. 1 @ - @ ( 3.6~2 Replace Ql...
  • Page 91 Defective Dl, D2 0 Poor R40 soldering Defective Q40‘ Poor soldering of R42, applied to Q41 base? R45, R46 and R48 Defective 041 > Poor soldering of R43 applied to Q42 base? and R47 Defective Q42 Poor R44 soldering ALL KEYS FAIL TO TRANSMIT INPUT &...
  • Page 92 SPECIAL MATRIX GROUP KEYS 3* FAIL TO TRANSMIT INPUT (Vertical group keys) For example, in case Of Correct soldering BROIL, 6, TIMER and or Cl 00 soldered normally? HIGH MIX/ROAST. Defective LSI (I-1) (Horizontal group keys 1 For example, in case of BROIL, MED, MED LOW/ , Correct soldering connector (G) or RlOO...
  • Page 93 4. I COOK DOES NOT START. Defective Damper circuit Is cooking possible Damper motor for about 1 min.? Shut-off relay (RY4) 0 See C. “Check Damper circuit” (Next page) Defective motor rotate when shut-off relay cooking is started? (RY-2) Defective LSI (I-1) Replace D3 and D5 or D3 and 05 oppened or...
  • Page 94 Check shut-off Is 220/24OV AC relay MY 4) circuit Check damper switch or Check and replace poor contact of damper damper motor switch connector. Is normal voltage Defective > applied to each relay coil ? Relay Replace to each relay in parallel Diode Replace D3 and D5 or correct soldering.
  • Page 95 BUZZER DOES NOT SOUND Is normal waveform (2.5KHz) Replace applied across pin No. 1 and 5 > Buzzer (St’1 1 of relay unit connector (DI ? Is normal waveform (2.5KHzI applied across pin No. 42 (D, 1 of LSI (l-2) and “GND”? Defective 050 0 Wrong constant of R51, R52 &...
  • Page 96 Faulty display Defective Is segment signal of A + Fluorescent Display segments of all degits Poor soldering Is digit signal of Are all segments of Defective Fluorescent Display > specific digit not lit up? 0 LSI (l-2) FAULTY CONVECTION OPERATION Replace Thermistor To page 96...
  • Page 97 From page 95 Defective ZD30 Poor.soldering Defective VR30, VR31 Poor soldering Wrong constant of R31, R32, R33, R34 & R35 Adjustment...

  • Page 98: Adjustment Of Thermistor Sensor Circuit

    ADJUSTMENT OF THERMISTOR SENSOR CIRCUIT (5) Touch CONVECTION, 250°C and COOK pads. Adjust this circuit if necessary in order to measure the (Then, the temperature will be displayed) temperature of food correctly. (6) Rotate the volume VR30 until the indication turns to “43C z!z 2 o C”...

  • Page 99: Warning

    CHAPTER VI COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE WARNING: to avoid possible exposure to microwave 2. There is a broken door hinge or support. energy; 3. The door gasket or seal is damaged. Before operating the oven; 4. The door is bent or warped. 1.

  • Page 100: Outer Case Removal

    OUTER CASE REMOVAL from the retaining clips on cavity face plate. To remove the outer case, refer to Figure 29 and proceed 4. Lift the entire case from the unit. as follows: 1. Disconnect the oven from the power supply. CAUTION: DISCHARGE THE HIGH VOLTAGE CAPA- 2.

  • Page 101: Turntable Motor Removal

    TURNTABLE MOTOR REMOVAL 6. Remove the base cabinet (B). 1. Disconnect the oven from the power supply and remove 7. Disconnect the wire leads from the turntable motor. the outer case. 8. Remove the four (4) screws holding the turntable mo- 2.
  • Page 102 CONVECTION AIR GUIDE (A). CONVECTION FAN BEI HEATING ELEMENT C O N V E C T I O N F A N - TURNTABLE TRAY OVEN CAVITY- WAVE‘GUIDE COVEk TURNTABLE COUPeG ASSEMBLY UPPER MOTOR SPACER TURNTABLE MOTOR MOUNTING BRACKET TURNTABLE MOTOR I FL7 PLATE (8) - SECONDARY Ih...
  • Page 103 DAMPER ARM LEVER DAMPER- - D A M P E R 1. l-4-l ANGLE SECTION <AN MAGNETRON ASSEMBLY fMENT , / / MAGNETRON /THERM0 CUT-OUT i!l - h a COOLING C T (B) UPPER LATkH ,” ‘CHASSIS SUPPO MAGNETRON COOLING DUCT (A) PRIMARY INTERLOCK SWITCH SECONDARY INTERLOCK...
  • Page 104 STEAM DUCT (E) STEAM DUCT (D) STEAM DUCT (Cl’ % : : . ; * : o - 1 I T . OVEN ‘~ L \ OVEN LAMk SOCKET OVEN LAMP SCREEN GLASS THERMAL PROTECTION PLATE (A) Figure 31. Oven Cavity C...
  • Page 105 AIR GUIDE DUCT (B) T (B) --THERMAL PROTECTION PLATE (D) re 31. Oven Cavity Components (Part II)

  • Page 106: Damper Motor And Damper Switch Removal

    DAMPER MOTOR AND DAMPER SWITCH REMOVAL 3. Install the arm lever to the damper angle and mounting Disconnect the oven from the power supply and remove screw (B) should then be tightened securely. the outer case. 4. Set the convection cooking condition and touch the Discharge the high voltage capacitor.

  • Page 107: Oven Lampremoval

    OVEN LAMP REMOVAL 2. Discharge the high voltage capacitor. 1. Disconnect the oven from the power supply and remove 3. Remove the oven lamp. the outer case. UPPER LATCH SWITCH AND MONITOR SWITCH (AUSTRALIA MODEL) REMOVAL 5. Remove the single (1) screw and washer holding the 1.
  • Page 108 UPPER LATCH SWITCH, LOWER LATCH SWITCH AND MONITOR SWITCH (AUSTRALIA MODEL) ADJUSTMENT In case the upper and lower latch switches do not operate properly due to a misadjustment, the following adjustment should be taken. 1. Loosen the single (1) screw holding the upper latch hook to the oven cavity front flange and the single (1) screw holding the lower latch hook to the same flange.

  • Page 109: Control Panel Assembly And Components Removal

    CONTROL PANEL ASSEMBLY AND COMPONENTS REMOVAL 2. Take off the 1 l-pin connector of key unit from the The complete control panel should be removed for control unit. replacement of the components. 3. Remove the seven (7) screws holding the control panel To remove the control panel, refer to Figure 34 and as and key unit angle to the back plate.
  • Page 110 CONTROL PANEL FRAME ASSEMBLY lISPLAY FILTER ‘\ UNIT ANGLE STOP SW I TCH ‘V FL.UORESCENT DISPLAY 1 l-PIN i CONNECTOR OPEN DEVICE ASSEMBLY OPEN BUTTON CONNECTOR CONTROL PANEL BACK PLATE 2-PIN 5-PiN CONNECTOR WIRE CONNECTOR Figure 34. Control Panel and Components...

  • Page 111: Door Replacement And Adjustment

    DOOR REPLACEMENT AND ADJUSTMENT DOOR ADJUSTMENT DOOR REPLACEMENT When removing and/or loosening hinge such as in the case 1. Disconnect the oven from the power supply and re- of a door replacement, the following adjustment criteria move the outer case. are taken.
  • Page 112 MICROWAVE MEASUREMENT PROCEDURE Recommended instruments are: After the adjustment of the door interlock switches and door is completed individually or collectively, the following NARDA 8100 leakage test must be performed with a survey instrument NARDA 8200 and it must be confirmed that the result meets the require- HOLADAY HI 1500 SIMPSON 380M ments of the performance standard for microwave oven.

  • Page 113: Schematic Diagram

    22OV - 50Hz BLU118 BRNIIS ,118 NHT118 ‘2, : LINE BYPASS CAPACITOR ,,,-+t- ;E~;~~TPOARSI FUSE MlOA OVEN LAMP RED/18 yA&--yp”“g OR;, ’ RED118 SW,: LOWER LATCH SWITCH SW,: STOP SWITCH THERMISTEF 3RGl18 x----d L----t-- SW, : WIRING COLOUR CODE SYMBOL RED: WHT: WHITE...
  • Page 114 THERMISTOR MONITOR SWITCH -:-It CONTROL UNIT CONTROL PANEL ASS’Y Figure 38 Pictorial Diagram (Australia Model)
  • Page 115 CONVECTION CONVECTION MOTOR MOTOR DAMPER DAMPER MOTOR MOTOR --ml/ MAGNETRON @j--j@ MAGNETRON THERM0 CUT-OUT MOTOR TURNTABLE MOTOR RED _. [! “. RECTIFIER HIGH VOLTAGE TRANSFORMER CAPACITOR Diagram 1 Model)
  • Page 116 THERMISTOR CONTROL UNIT 0” RY-1 I------l RY-4 R 0” CONTROL PANEL ASS’Y Figure 39 Pictorial Diagram (Aouth Africa Model)
  • Page 117 I-HERMISTOR DAMPER MOTOR MAGNETRON MAGNETRON THERM0 MOTOR CUT-OUT TURNTABLE LINE BYPASS MOTOR CAPACITOR ---t-l RECTIFIER HIGH POW’ TRANSFORMER CAPACITOR iagram :a Model)
  • Page 118 240V - 50Hz WH’ r/l8 L2: OVEN LAMP F, : FUSE MlOA SW, : MONITOR SWITCH <, RED/l8 & SW,: LOWER M, : TURNTABLE MOTOR LATCH SWITCH o+Gb (ORG Iv, : STOP SWITCH f?!hf-c~.~ THERMISTEF 3RGI18 WIRING COLOUR CODE SYMBOL WHT: WHITE RED:...
  • Page 119 PRINTED WIRING BOARD (CONTROL UNIT) To 12...
  • Page 120 CONTROL PANEL RELAY POWER SUPPLY ,ZO” 6OHZ ATER CtRCUlTt -___-- i-i---$ / j 1 / / / / ” I---F6c-l.i-, ‘I LINE R1.31 (GNO) “DD HEATER RELA 2SC2021 (HEATER, I~U~~ER CIRCU~TXI-: &J IL”!. 1.11 CONVECTION MOTOR FAN, TURNTABLE MOTOR ,TTM, OVEN LAMP I0.U COOLING...
  • Page 121 IEL AND RELAY UNIT CIRCUIT i iiiitiii Cl00 3300 STOP SWTCH...
  • Page 122 PRINTED WIRING BOARD (RELAY UNIT)

  • Page 123: Packing And Accessories

    PACKING AND ACCESSORIES PACKING ADD KIT (CPADB0169WRKO) DOOR PROTECTION SHEET ISPAQPQOO7YBPOJ TRAY HOLDER TRAY PACKING FOAM tSPADP0235r...
  • Page 124 PARTS LIST DESCRIPTION Q’TY CODE REF.NO. PART NO. ELECTRICAL PARTS BP ’ Magnetron assembly l- 1 F V-MZ 0 1 2 4WR K 0 l- 2 RTHM-0 0 1 7WR E 0 Magnetron therm0 cut-out l- 3 R T R N-O 1 7 3 WR E 0 Power transformer (240V) R T R N-O 1 7 2 WR E 0 Power transformer (220V)
  • Page 125 REF.NO. PART NO. DESCRIPTION Q’TY CODE l-22 J RRLYU2052YAZZ Relay RYl, RY3, RY4 l-22 K RRLYV2041YAZZ Relay 1-22 L RALMBZOOZYAZZ Buzzer VSZSA683NCR-1 Transistor l-22M VHV450NR15/-1 l-22 N Varister VRSl l-22 0 RCiLF2004YAZZ Noise filter (22pH) VHDERB1201/-1 l-22P . Diode (ERB1201) DZ-6 VHDlS2473/..-1 Diode (lS2473)

  • Page 126: Control Panel Parts

    PART NO. DESCRIPTION REF.NO. Q’TY COD;] P S P A - 0 0 9 0 W R F 0 Door lever spacer (B) 2-17 LANGQ0225WRWO Cord mounting bracket 2-18 LSTPP0009YBFO Cord anchorage (lower) 2-19 LSTPP0008YBFO Z-20 Cord anchorage (upper) 2-21 P C A S - 0 0 1 7 W R F A Plug case 2-22...
  • Page 127 PART NO. DESCRIPTION REF.NO. Q’TY CODE 3- 1 A W VH EX Z - O 5 l / / - l Zener diode (XZ-051) 5V 3- 1A X V H E R D - 6 . 8//-l Z e n e r d i o d e ( R D 6 . 8 ) 6.8V ZD30 2050 3- 1A Y...
  • Page 128 REF.NO. PART NO. DESCRIPTION Q’TY CODE 3- 1CG 47Kfi VRD-STZEF473J Resistor 1/4W R 5 0 3- 1CH Resistor 18KQ 1/4w R 6 0 , R 6 1 VRD-STZEF183J 3- 1c I VRD-STZEF105J Resistor 1/4W R 7 0 3- 1CJ VRD-STZEF512J Resistor 5.1Kfl 1/4W R 9 6...
  • Page 129 REF.NO. PART NO. DESCRIPTION Q’TY CODE 4-15 LANGK0141WRFO Upper latch hook 4-16 MLEVF0124WREO Monitor switch lever (Aust-talia only) LANGK0142WRFO 4-17 Lower latch hook 4-18 PCUSG0218WRPO Air guide cushion 4-19 P D U C - 0 2 9 3 W R W O Steam ducf (A) 4-20 P D U C - 0 2 9 4 W R W O...
  • Page 130 REF.NO. DESCRIPTION PART NO. Q’TY CODE 4-52 N P L Y B 0 0 3 lWRF0 Pulley(B) 4-53 N B L T K 0 0 0 1 WR E 0 Convection fan belt 4-54 PCUSU0406WRPO Steam duct cushion(B) 4-55 PCUSU03 8 lWRP0 Steam duct cunhion (C) 4-56 PCUSU0337WRPO...
  • Page 131 REF.NO. PART NO. DESCRIPTION Q’TY CODE L X - B Z O 1 8 6 W R E O Screw; magnetron cooling duct (B> , capacitor mounting 7- 3 bracket, capacitor holder and cord mounting bracket mtg 7- 4 L X-CZ 0 0 1 7WR E 0 Screw ;...
  • Page 132 REF.NO. DESCRIPTION Q’TY CODE PART NO. XNESD4 O-3 2 0 0 0 Nut ; fan motor and earth wire mtg 7-32 Washer (square) ; outer case mtg 7-33 L X+VZ 0 0 3 4 WR E 0 7-34 XWHSD5 O-O 5 0 0 0 Washer ;...
  • Page 133 CABINET PARTS...
  • Page 134 0 4-4 4-l -...
  • Page 136 (II) OVEN PARTS $ : : ‘ I ; . ‘ , ‘ < k 5 , r I ? f ’ /’...
  • Page 138 CONTROL PANEL PARTS .’ /@-- /’ 7 @i-J/’...
  • Page 139 DOOR ASSEMBLY /’ /’ ,/I’ MISCELLANEOUS Capa. Mag.
  • Page 140 FIXING PROCEDURE OF CORD ANCHORAGE As for the above subject, sometime it may cause to have wrong fixing about two pieces of cord anchorage General : unit. But this cord anchorage is an important part for the safety, therefore it must be fixed correctly and firmly.

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