R-2397 SERVICE MANUAL S5708R2397H/X 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 RADIATION ...................................................................................................... 1 WARNING .............................................................................................................................
R-2397
R-2397 SERVICE MANUAL PRODUCT SPECIFICATIONS COMMERCIAL GENERAL INFORMATION R-2397 GENERAL IMPORTANT INFORMATION This Manual has been prepared to provide Sharp Corp. Service engineers with Operation and Service Information. It is recommended that service engineers carefully study the entire text of this manual, so they will be qualified to render satisfactory customer service.
R-2397 PRODUCT DESCRIPTION SPECIFICATION ITEM DESCRIPTION Power Requirements 230 Volts 50 Hertz Single phase, 3 wire grounded Power Consumption 2.7 kW Approx.
R-2397 APPEARANCE VIEW OVEN 10 11 1. Control panel 5 4 3 2 19 14 18 2. Hole for safety door latches 3. Ceramic floor 1 13 4. Splash cover 15 5. Oven light 6. Air intake filter 8 16 7. Air intake openings 12 8. Oven cavity 9 6 7 9. Door seals and sealing surfaces 17 10. Door hinges 11. Oven door with see-through window 12. Door safety latches AUTO TOUCH CONTROL PANEL 13. Door handle. 3 4 14. Outer cabinet 15. Removable cover over oven light bulb 16. Air vent openings 17.
R-2397 OPERATION SEQUENCE OFF CONDITION the relay RY1 stays closed. Shown in the display is the remaining time, but the program is cancelled if the oven is not started within 3 minutes. Closing the door activates all door interlock switches (1st latch switch, 2nd latch switch, 3rd latch switch and stop switch) 6. MONITOR SWITCH CIRCUIT The monitor switch is mechanically controlled by oven door, and monitors the operation of the 1st latch switch. 6-1.
R-2397 T2: HIGH VOLTAGE TRANSFORMER (FRONT) T1: HIGH VOLTAGE TRANSFORMER (REAR) C1: H.V. CAPACITOR ASYMMETRIC RECTIFIER C2: H.V. CAPACITOR ASYMMETRIC RECTIFIER H. V. RECTIFIER COMMERCIAL FREQUENCY (50HZ) POWER OUTPUT BY MAGNETRON 1 OPERATION OF MAGNETRON H. V. RECTIFIER MG2: MAGNETRON (LOWER) POWER OUTPUT BY MAGNETRON 2 MG1: MAGNETRON (UPPER) Figure B-1. High Voltage Circuit Figure B-2. Operation of Magnetron FUNCTION OF IMPORTANT COMPONENTS DOOR OPEN MECHANISM MONITOR SWITCH 1.
R-2397 FUSE F6.3A 250V MAGNETRON THERMISTOR 1. If the wire harness or electrical components are shortcircuited, this fuse blows to prevent an electric shock or fire hazard. 2. The fuse also blows when 1st latch switch remains closed with the oven door open and when the monitor switch closes. The air temperature around the lower magnetron is detected through the resistance of the thermistor.
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. 2) Door opened, and wedged open. 3) Discharge high voltage capacitor.
A B B C C C D D E E E E E F F G HIGH VOLTAGE TRANSFORMER T1 HIGH VOLTAGE TRANSFORMER T2 H.V. RECTIFIER ASSEMBLY FOR MG1 H.V. RECTIFIER ASSEMBLY FOR MG2 H.V. WIRE HARNESS H.V. CAPACITOR C1 H.V. CAPACITOR C2 1ST. LATCH SWITCH 2ND. LATCH SWITCH 3RD. LATCH SWITCH MONITOR SWITCH STOP SWITCH WEAK POINT A018 F3 WEAK POINT A018 F4 WEAK POINT A017 F1 POSSIBLE CAUSE AND DEFECTIVE PARTS CONDITION PPROBLEM “ . “ does not appear on display when power cord is plugged into wall outlet.
I I I J L K K K MAGNETRON THERMAL CUT-OUT 145˚C TC2 B. MOTOR THERMAL CUT-OUT 115˚C TC3 OVEN THERMAL CUT-OUTT 115˚C TC4 MONITOR RESISTOR R1 STIRRER MOTOR MAGNETRON THERMISTOR EXHAUST THERMISTOR INTAKE THERMISTOR M NOISE FILTER 9 P Q RELAY RY-1, RY-3, RY-4 FOIL PATTERN KEY UNIT BLOCKED STIRRER ANTENNA TEMPERATURE OF MAGNETRON THERMISTOR IS HIGH TEMPERATURE OF INTAKE THERMISTOR IS HIGH TEMPERATURE OF EXHAUST THERMISTOR IS HIGH DUE TO PROGRAMME LOCK OVER THE MAX.
R-2397 TEST PROCEDURES PROCEDURE LETTER A 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 filament terminal. 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.
R-2397 TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST Initial temperature............................................................................................... T1 = 11°C Temperature after (25 + 3) = 28 sec. . ................................................................ T2 = 21°C Temperature difference Cold-Warm ................................................................... ∆T = 10°C Measured output power The equation is “P = 170 x ∆T” ..............................................
R-2397 TEST PROCEDURES PROCEDURE LETTER 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 A+B 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.
R-2397 TEST PROCEDURES PROCEDURE LETTER G COMPONENT TEST WEAK POINT A017 CARRY OUT 3D CHECKS. If the weak point A017 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 A017 with the correct value replacement. H FUSE F6.3A TEST CARRY OUT 3D CHECKS. If the fuse F6.
R-2397 TEST PROCEDURES PROCEDURE K LETTER MAGNETRON THERMISTOR TEST COMPONENT 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 ........................ Approx. 15.91 kΩ 20˚C ........................ Approx. 13.04 kΩ 25˚C ........................ Approx. 10.74 kΩ If the meter does not indicate above resistance, replace the thermistor.
R-2397 TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST WHT N F1 L L (min) 0.5mH Cx L L Cy Cx ± 20% 0.22 µF Cy ± 20% 4700 pF BLK MEASURING POINT Between N and L Between terminal N and WHITW Between terminal L and BLK INDICATION OF OHMMETER Open circuit Short circuit 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.
R-2397 TEST PROCEDURES (CONT'D) PROCEDURE LETTER COMPONENT TEST 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. P RELAY TEST CARRY OUT 3D CHECKS. Remove the outer case and check voltage between Pin Nos. 5 and 7 of the connector (A) on the control unit with an A.C. voltmeter. The meter should indicate 230 volts, if not check control unit circuity.
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. 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 if there is a magnetron / high voltage problem.
R-2397 DESCRIPTION OF LSI LSI(IZA646DR) The I/O signal of the LSI(IZA646DR) is detailed in the following table. Pin No. Signal I/O Description 1 VREF IN Reference voltage input terminal. A reference voltage applied to the A/D converter in the LSI. Connected to GND.(0V) 2 IN7 IN Temperature measurement input: MAGNETRON THERMISTOR. By inputting DC voltage corresponding to the temperature detected by the thermistor, this input is converted into temperature by the A/D converter built into the LSI.
R-2397 Pin No. Signal I/O 27 RESET IN Auto clear terminal. Signal is input to reset the LSI to the initial state when power is supplied. Temporarily set to "L" level the moment power is supplied, at this time the LSI is reset. Thereafter set at "H" level. Description 28 XIN IN Internal clock oscillation frequency setting input. The internal clock frequency is set by inserting the ceramic filter oscillation circuit with respect to XOUT terminal.
R-2397 Pin No. 46 Signal P10 I/O OUT Description 47-48 P07-P06 OUT Segment data signal. Signal similar to P17. 49 P05 OUT Digit selection signal. The relation between digit signal and digit are as follows: Segment data signal. Signal similar to P17. Digit signal P05 P04 P03 P02 P01 P00 H ß(50Hz) L GND Digit 1st. 2nd. 3rd. 4th. 5th. 6th. P05 -31(V) P04 P03 P02 P01 Normally, one pulse is output in every ß period, GND and input to the grid of the Fluorescent Display.
R-2397 Pin No. 1-3 4 5 6 7 8 Signal A0-A2 VSS SDA SCL TEST VCC I/O IN IN IN/OUT IN IN IN Description Connected to GND. Connected to VC(-5V). Serial data input/output : input/outputs data to IC1. Clock signal input : input/outputs sireal data at every one pulse. Connected to VC(-5V). Connected to GND. SERVICING 1. 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.
R-2397 PROCEDURE FOR CHECKING/CLEARING SERVICE COUNTS OF MICROWAVE OVEN 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. The following procedure enables the servicer to obtain the total service counts (cook cycles) for memory cooking, double quantity cooking and defrost. The maximum capacity of the counter is 999,999 counts, above which the counter will reset to "0".
R-2397 Memory No. 1 2 3 4 5 6 7 8 9 10 11-20 Cook Time 5 sec. 10 sec. 20 sec. 30 sec. 40 sec. 50 sec. 1 min. 1 min. 15 sec. 1 min. 30 sec. 2 min. 0 sec. Output Power 100% 100% 100% 100% 100% 100% 100% 100% 100% 100% Enter the memory information of magnification of double into the memory pads 1 ~ 20 (all 1.80). Ex, To set memory 1 PAD ORDER SET SET DOUBLE 1 1,8,0 SET SET "NUMBER" "NUMBER" NUMBER 1 NUMBER 1 "NUMBER" DISPLAY . . . 0.00 1.80 . .
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 that a 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, it is then possible to hear a “click’ as the door switches operate.) 3.
R-2397 MAGNETRON REMOVAL 1. Remove the outer case cabinet referring to "OUTER CASE REMOVAL" and CARRY OUT 3D CHECKS. 2. Remove the eleven (11) screws holding the rear cabinet to the oven cavity. 3. Disconnect the power supply cord from the noise filter. 4. Remove the one (1) screw holding the earth wire of the power supply cord to the noise filter angle. 5. Remove the rear cabinet with the power supply cord from the oven cavity. 6.
R-2397 CONTROL PANEL ASSEMBLY AND CONTROL UNIT REMOVAL CONTROL PANEL ASSEMBLY REMOVAL Replacement of individual component is as follows: The complete control panel should be removed for replacement 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.
R-2397 POWER SUPPLY CORD REPLACEMENT 1. 2. 3. 4. 5. CARRY OUT 3D CHECKS Release the cord bushing from the rear cabinet. Disconnect the brown and blue wires of the power supply cord from the noise filter. Loosen the single (1) screw holding the earth angle and earth wire of power supply cord. Remove the power supply cord. 4. 5. 6. 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.
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. 4. 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.
R-2397 SERVICE INFORMATION IMPORTANT: When replace the magnetron MG1 and/or MG2, the relays RY3 and RY4 on control unit must be replaced at the same time. Because if the magnetron's life has been over, the relay's life may also be over.
R-2397 SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED 2. APPEARS ON DISPLAY ASYMMETRIC RECTIFIER MG1: MAGNETRON (UPPER) MG2: MAGNETRON (LOWER) T2 : HIGH VOLTAGE TRANSFORMER (REAR) B3 C2: H.V. CAPACITOR EXHAUST THERMISTER B2 STOP SWITCH B1 BM BLOWER MOTOR INTAKE THERMISTER H1 H3 D3 D1 RY4 RY3 RY1 A1 SM SM STIRRER MOTOR OL OVEN LAMP 1ST LATCH SWITCH (PRIMARY INTERLOCK SWITCH) MAGNETRON THERMISTER TAB2 TAB4 TAB3 TAB1 A3 A7 A5 CONTROL UNIT ASYMMETRIC RECTIFIER H. V.
H 1 2 3 31 RY-1 RY-4 T1 4 INTAKE THERMISTOR TAB3 BRN TAB4 ORG CN-A 1 ORG 2 3 PNK 4 5 WHT 6 7 BLK TAB2 BRN TAB1 ORG BLU GRN GRN NO B L U E 5 G R Y G W R H Y T MG2 RED GRY WHT ORG MAGNETRON (Lower) FERRITE BLK BLK MAGNETRON THERMISTOR BRN TC1: MAGNETRON THERMAL CUT- OUT (Upper) FERRITE MG1 MAGNETRON (Upper) TC2: MAGNETRON THERMAL CUT- OUT (Lower) ORG STIRRER MOTOR O R G Figure S-1.
3 A CT2 CT1 c a : IF NOT SPECIFIED, 0.01µF / 16V : IF NOT SPECIFIED, ISS270A 1K D62 R64 1K D61 R63 d P S2 D3 D2 2 C71 30K Q1 470 R80 2SB953 R71 VP DOOR SWITCH B B 1 Q84 DTB143ES Q83 DTB143ES Q81 DTD143ES D70 11ES1 R84 1/2W 39 R83 1/2W 39 D4 D1 D1~D4:11ES1 D7 11ES1 B EXHAUST THERMISTOR 3 VC 6.8K 3 D 0.01uF, 16V C200 1 47K INTAKE THERMISTOR D Q2 2SA1561T CF1 CST4.00MGW R79 VP 0.
R-2397 1 2 4 3 A 5 6 A 1 10 20 26 1 D I P 2 R4 R300 32 R20 B 4 5 25 20 50 15 55 10 1 B Q41 R41 5 45 D96 40 1 R71 33 R101 R100 R99 R96 D95 D94 D93 (D92) (D91) D97 B R95 R94 R93 (R92) (R91) R97 R96 3 (J1) 10 E 3 B (Q201) 10 C (J3) 1 5 60 (D200) (J2) 3 1 64 R43 R42 (J7) (J8) 2 C E (D201) R40 12 (Q200) (D74 .R50) 3 1 5 D D (D85) 4 4 1 5 8 12 R63 (J11) R65 E E 1 3 (1) F 5 (3) F 9 (7) (9) G G (ZD3) H H Figure S-3.
R-2397 PARTS LIST Note: The parts marked "∆" may cause undue microwave exposure. The parts marked "*" are used in voltage more than 250V. REF. NO. PART NO.
R-2397 Note: The parts marked "∆" may cause undue microwave exposure. The parts marked "*" are used in voltage more than 250V. REF. NO. C80 C81 C82 C200 CF1 D1-4 D5 D6-7 D61-64 D70 D71 D81 D83-84 D93-97 IC1 IC2 Q1 Q2 Q20 Q40 Q41 Q80 Q81 Q83-84 R1 R3 R4 R5 R6 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 (J2) (J3) RY1 RY3-4 SP1 T1 CT1-2 VRS1 ZD1 ZD2 3- 2 3- 2-1 3- 2-2 3- 2-3 3- 3 3- 4 3- 5 3- 6 PART NO.
R-2397 Note: The parts marked "∆" may cause undue microwave exposure. The parts marked "*" are used in voltage more than 250V. REF. NO. 3- 7 PART NO.
R-2397 Note: The parts marked "∆" may cause undue microwave exposure. The parts marked "*" are used in voltage more than 250V. ∆ REF. NO. 5-13 5-14 5-15 5-16 5-17 5-18 5-19 5-20 5-21 PART NO.
R-2397 HOW TO ORDER REPLACEMENT PARTS To have your order filled promptly and correctly, please furnish the following information. 1. MODEL NUMBER 3. PART NO. 1 2 2. REF. NO. 4.
R-2397 2 1 4 3 6 5 6-14 OVEN AND CABINET PARTS 2-5-2 7-31 2-6 2-5-1 A A 7-37 2-5 4-20 7-14 7- 8 6-6 7-29 6-14 7-18 B B 7-23 7-11 7-18 6-10 6-13 7-8 2-7 4-43 7-14 4-26 7-18 7-12 2-4 7-1 4-39 1-7 4-24 1-9 4-25 4-2 C 4-49 7-1 7-22 1-16 7-15 1-17 6-11 D 1-23 1-18 4-54 7-24 1-5 1-1 7-18 4-13 4-21 7-16 7-32 x-2 6-17 6-18 7-33 4-12 7-36 6-19 A2 4-26 A1 4-40 E 7-20 1-22 1-23 A2 A1 4-27 7-33 1-5 1-20 7-36 4-4 4-28 7-18 7-18 4-3 D 7-25 4-29
R-2397 2 1 4 3 CONTROL PANEL PARTS 6 5 3-7 3-2-3 3-1 A A 3-2 3-2-2 B B 3-5 3-4 C C 3-6 3-3 1-3 D D 3-2-1 DOOR PARTS 5-4 E E 5-11 5-10 5-11 5-14 5-21 5-1 5 5-20 5-12 5-15 F F 5-18 5-8 5-6 5-16 5-13 5-17 5-9 5-7 G G 5-6 5-13 5-2 5-19 5-3 H H 5-5 1 2 4 3 40 5 6
R-2397 PACKING ADD KIT * CPADBA203WRK0 DOOR PROTECTION SHEET * SPADPA552WRE0 WRAP COVER DOOR PAD * SPADF0341WRE0 TRAY HOLDER * SPADPA551WRE0 PACKING CASE * SPAKCC551WRE0 * Not replaceable items.
R-2397 '97 SHARP CORP. (5U0.