Table of Contents
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In the interest of user-safety the oven should be restored to its original condition and only parts identical to those specified should
be used.
WARNING TO SERVICE PERSONNEL: Microwave ovens contain circuitry capable of producing very high voltage
and current. Contact with the following parts may result in a severe, possibly fatal, electrical shock. (Inverter unit
that includes High Voltage Capacitor, High Voltage Power Transformer, High Voltage Rectifier and Heat sink etc.,
and Magnetron, High Voltage Harness etc..)
BEFORE SERVICING ..................................................................................................... INSIDE FRONT COVER
WARNING TO SERVICE PERSONNEL .............................................................................................................. 1
MICROWAVE MEASUREMENT PROCEDURE .................................................................................................. 2
FOREWORD AND WARNING ............................................................................................................................. 3
PRODUCT SPECIFICATIONS ............................................................................................................................. 4
GENERAL INFORMATION ................................................................................................................................. 4
OPERATION ........................................................................................................................................................ 6
TROUBLESHOOTING GUIDE ........................................................................................................................... 14
TEST PROCEDURE .......................................................................................................................................... 16
TOUCH CONTROL PANEL ASSEMBLY ........................................................................................................... 27
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ............................................................... 33
PICTORIAL DIAGRAM ....................................................................................................................................... 41
POWER UNIT CIRCUIT ..................................................................................................................................... 42
LSI UNIT CIRCUIT ............................................................................................................................................. 43
PRINTED WIRING BOARD ............................................................................................................................... 44
PARTS LIST ....................................................................................................................................................... 45
PACKING AND ACCESSORIES ........................................................................................................................ 50
distinctive appliances
SERVICE MANUAL
OVER THE RANGE
MICROWAVE OVEN
MODELS
TABLE OF CONTENTS
This document has been published to be used for after
sales service only.
The contents are subject to change without notice.
S00M151PMOR3E
PMOR30B
PMOR30R
PMOR30S
PMOR30B
PMOR30R
PMOR30S
Page
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Summary of Contents for Dacor PMOR30B
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Page 1: Table Of Contents
PMOR30B PMOR30R PMOR30S SERVICE MANUAL S00M151PMOR3E OVER THE RANGE MICROWAVE OVEN PMOR30B MODELS PMOR30R PMOR30S In the interest of user-safety the oven should be restored to its original condition and only parts identical to those specified should be used. WARNING TO SERVICE PERSONNEL: Microwave ovens contain circuitry capable of producing very high voltage and current. -
Page 2: Precautions To Be Observed Before And During Servicing To Avoid Possible Exposure To Excessive Microwave Energy
2) contact DACOR and Food and Drug Administration's Center for Devices and Radiological Health immediately. Service personnel should inform DACOR of any certified unit found with emissions in excess of 4mW/cm The owner of the unit should be instructed not to use the unit until the oven has been brought into compliance. -
Page 3: Warning To Service Personnel
PMOR30B PMOR30R PMOR30S WARNING TO SERVICE PERSONNEL Microwave ovens contain circuitry capable of pro- ducing very high voltage and current, contact with following parts may result in a severe, possibly fatal, electrical shock. (Example) Inverter unit that includes High Voltage Capacitor, High Voltage Power Transformer, High Voltage Rectifier, Heat sink etc., and Magnetron, High... -
Page 4: Microwave Measurement Procedure
PMOR30B PMOR30R PMOR30S SERVICING FOR INVERTER UNIT WARNING This inverter unit contains circuitry capable of producing high voltage and high current. Contact with any part of the high voltage will result in electrocution. DO NOT ACCESS ANY PARTS OF INVERTER UNIT WITH POWER SUPPLY CONNECTED. -
Page 5: Foreword And Warning
MICROWAVE OVEN PMOR30B / PMOR30R / PMOR30S GENERAL INFORMATION FOREWORD This Manual has been prepared to provide Dacor Service Personnel with OPERATION Operation and Service Information for the DACOR OVER THE RANGE MICROWAVE OVEN, PMOR30B, PMOR30R and PMOR30S. It is recommended that service personnel carefully study the entire text... -
Page 6: Product Specifications
PMOR30B PMOR30R PMOR30S PRODUCT SPECIFICATION ITEM DESCRIPTION Power Requirements 120 Volts / 14 Amperes / 1600 W 60 Hertz Single phase, 3 wire grounded Power Output 1100 watts (IEC TEST PROCEDURE) Operating frequency of 2450MHz Case Dimensions Width 29-15/16" Height 16-3/8"... -
Page 7: Oven Diagram
PMOR30B PMOR30R PMOR30S Electrical Requirements The oven is equipped with a 3-prong grounding plug. DO NOT UNDER ANY CIRCUMSTANCES CUT OR REMOVE THE GROUNDING PIN FROM THE PLUG. The power supply cord and plug must be connected to a separate 120 Volt AC, 60 Hz, 15 Amp. or more dedicated line, using a grounded receptacle. -
Page 8: Operation
PMOR30B PMOR30R PMOR30S CONTROL PANEL NOTE: The directed features are disabled after three minutes when the oven is not in use. These features are automatically enabled when the door is opened and closed or the STOP/ CLEAR pad is pressed. - Page 9 PMOR30B PMOR30R PMOR30S 1. The contacts of relays are closed and components programmed at the ratio of ON time and OFF time within 32 connected to the relays are turned on as follows. sec./ cycle time base. (For details, refer to Figure O-2) CONNECTION BETWEEN POWER SETTING AND ON/ OFF TIME OF INVERTER UNIT.
- Page 10 PMOR30B PMOR30R PMOR30S 3. Sensor detects moisture and humidity and calculates : AIR FLOW cooking time and variable power. TO DUCT TO DUCT HOOD FAN MOTOR Cooking Sequence. 1. Operate the oven in sensor cooking mode by referring to the operation manual.
- Page 11 PMOR30B PMOR30R PMOR30S Wave-form of main parts are shown in Figure A-2. being destroyed. After approx. 60 millisecond, it starts During off-time, flyback voltage appears on the primary generating the driving signal from the minimum pulse width winding of the high voltage transformer. The off-time de-...
- Page 12 PMOR30B PMOR30R PMOR30S SCHEMATIC OVEN MAGNETRON THERMAL CUT-OUT TEMPERATURE FUSE NOTE: CONDITION OF OVEN 1. DOOR CLOSED COM. CONTROL UNIT 2. CLOCK APPEARS ON DISPLAY FUSE HOOD FAN THERMAL High CUT OUT N.C. STOP SWITCH HOOD 120 V AC. CAPACITOR...
- Page 13 PMOR30B PMOR30R PMOR30S Figure O-3. Inverter Unit Circuit...
- Page 14 PMOR30B PMOR30R PMOR30S ZD50 ZD30 ZD70 VRS4 SOLDER DANGER H.V. Figure O-4. Printed Wiring Board for Inverter Unit Circuit...
- Page 15 PMOR30B PMOR30R PMOR30S DESCRIPTION AND FUNCTION OF COMPONENTS DOOR OPEN MECHANISM LOCK SWITCH AND MONITOR SWITCH FOR PROPER OPERATION. (REFER TO CHAP- The door is opened by pulling the door handle, refer to the TER "TEST PROCEDURE"). Figure D-1. NOTE: MONITOR FUSE AND SWITCH ARE REPLACED...
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Page 16: Troubleshooting Guide
PMOR30B PMOR30R PMOR30S STIRRER MOTOR HOOD LAMP The stirrer motor drives the stirrer fan to stir the microwave The hood lamps are mounted at the hood lamp angle on the radiation from the waveguide. base cover. The hood lamps can be turned off and on by touching the Light Options pad. - Page 17 TEST PROCEDURE PROBLEM CONDITION Home fuse blows when power cord is plugged into wall receptacle. Monitor fuse blows when power cord is plugged into wall receptacle. Display does not illuminate when power cord is first plugged into wall receptacle. Display does not operate properly when STOP/CLEAR key is touched. (The time of day should appear on the display with beep sound during normal condition.) CONDITION...
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Page 18: Test Procedure
PMOR30B PMOR30R PMOR30S TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER MAGNETRON ASSEMBLY TEST 1. Disconnect the power supply cord, and then remove outer case. 2. Open the door and block it open. 3. To discharge high voltage capacitor, wait for 60 seconds. - Page 19 PMOR30B PMOR30R PMOR30S TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER Chart for checking the defective inverter unit Varistor VRS2 is defective. No power at full power output cooking Exchange the defective parts. When a foil pattern at "e" is broken, insert a jumper Varistor VRS2 or/and foil pattern open wire at "J2"...
- Page 20 PMOR30B PMOR30R PMOR30S TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER Description of main parts SYMBOL PART NAME FUNCTION C11, C12 High voltage capacitor High voltage capacitor for doubler circuit. Film capacitor To smooth line ripple Film capacitor Capacitor for resonant Current transformer...
- Page 21 PMOR30B PMOR30R PMOR30S TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 4. Transistor Q2 and Q3 Check the resistance of transistor Q2 and Q3 by using ohmmeter as shown in Fig- OK: Normal ure B-5. NG: Defect The resistance between B and E of tran- ∞...
- Page 22 PMOR30B PMOR30R PMOR30S TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER PRIMARY INTERLOCK SWITCH AND SECONDARY INTERLOCK SWITCH TEST 1. Disconnect the power supply cord, and then remove outer case. 2. Open the door and block it open. 3. To discharge high voltage capacitor, wait for 60 seconds.
- Page 23 PMOR30B PMOR30R PMOR30S TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 3. To discharge high voltage capacitor, wait for 60 seconds. 4. If the monitor fuse is blown when the door is opened, check the primary interlock switch, secondary interlock switch and monitor switch according to the "TEST PROCEDURE" for those switches before replacing the blown monitor fuse.
- Page 24 PMOR30B PMOR30R PMOR30S TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER TOUCH CONTROL PANEL ASSEMBLY TEST The touch control panel consists of circuits including semiconductors such as LSI, ICs, etc. Therefore, unlike conventional microwave ovens, proper maintenance cannot be performed with only a voltmeter and ohmmeter.
- Page 25 PMOR30B PMOR30R PMOR30S TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 1) Disconnect the power supply cord, and then remove outer case. 2) Open the door and block it open. 3) To discharge high voltage capacitor, wait for 60 seconds. 4) Reconnect all leads removed from components during testing.
- Page 26 PMOR30B PMOR30R PMOR30S TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 9. Open the door and block it open. 10.To discharge high voltage capacitor, wait for 60 seconds. 11.Reconnect all leads removed from components during testing. 12.Re-install the outer case (cabinet). 13.Reconnect the power supply cord after the outer case is installed.
- Page 27 PMOR30B PMOR30R PMOR30S TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 6) After that procedure, re-connect the power supply cord. 7) Follow the troubleshooting guide given below for repair. STEPS OCCURRENCE CAUSE OR CORRECTION The rated AC voltage is not present between Pin No.
- Page 28 PMOR30B PMOR30R PMOR30S TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER (4) Remove the AH sensor. (5) Install the new AH sensor. (6) Reconnect all leads removed from components during testing. (7) Re-install the outer case (cabinet). (8) Reconnect the power supply cord after the outer case is installed.
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Page 29: Touch Control Panel Assembly
PMOR30B PMOR30R PMOR30S TOUCH CONTROL PANEL ASSEMBLY OUTLINE OF TOUCH CONTROL PANEL The touch control section consists of the following units. In addition, the synchronizing signal is available in order to compose a basic standard time in the clock circuit. -
Page 30: Description Of Lsi
PMOR30B PMOR30R PMOR30S DESCRIPTION OF LSI LSI(IZA958DR) The I/O signal of the LSI(IZA958DR) is detailed in the following table. Pin No. Signal Description TIOCA2 Power level data output signal for inverter unit. 16.7 msec. H : +5V The power level will be decided by the time ratio of T1 and T2. - Page 31 PMOR30B PMOR30R PMOR30S Pin No. Signal Description Key strobe signal. Signal applied to touch screen section. A pulse signal is input to PB1-PB5 terminal while one of G7 line keys on key matrix is touched. Key strobe signal. Signal applied to touch screen section. A pulse signal is input to PB1-PB5 terminal while one of G8 line keys on key matrix is touched.
- Page 32 PMOR30B PMOR30R PMOR30S Pin No. Signal Description XTAL Internal clock oscillation frequency control input setting. The internal clock frequency is set by inserting the ceramic filter oscillation circuit with respect to XTAL. Power source voltage : +5V. The power source voltage to drive LSI is input to Vcc terminal. Connected to VCC.
- Page 33 PMOR30B PMOR30R PMOR30S ABSOLUTE HUMIDITY SENSOR CIRCUIT resistance balance of the bridge circuit is deviated to (1) Structure of Absolute Humidity Sensor increase the voltage available at AN4 terminal of the LSI. The absolute humidity sensor includes two thermistors Then the LSI observes that voltage at AN4 terminal and as shown in the illustration.
- Page 34 PMOR30B PMOR30R PMOR30S SERVICING 1. Precautions for Handling Electronic Components 4) Re-install the outer case (cabinet). This unit uses CMOS LSI in the integral part of the 5) Re-connect the power supply cord after the outer circuits. When handling these parts, the following case is installed.
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Page 35: Component Replacement And Adjustment Procedure
PMOR30B PMOR30R PMOR30S COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE WARNING AGAINST HIGH VOLTAGE: Microwave ovens contain circuitry capable of producing very high voltage and current, contact with following parts may result in severe, possibly fatal, electric shock. (Example) Inverter unit that includes High Voltage Capacitor, Power Transformer, High Voltage Rectifier and Heat sink etc., and Magnetron, High Voltage Harness etc.. - Page 36 PMOR30B PMOR30R PMOR30S REMOVAL OF OVEN FROM WALL (It is recommended that two people remove the oven) 1. Disconnect the power supply cord, and uncoil the power 6. While supporting the front of the oven, unfasten the two supply cord.
- Page 37 PMOR30B PMOR30R PMOR30S NOTE: The high voltage wire assembly should be routed inverter unit board. under the bar of thr high voltage transformer. 3. Remove the one (1) screw holding transistor Q1to the heat sink. [HOW TO REMOVE TRANSISTOR Q1] 4.
- Page 38 PMOR30B PMOR30R PMOR30S Top of Oven Cavity 8. Disconnect the wire leads from the thermal cut-out (oven). Thermal 9. Now, the thermal cut-out (oven) is free. Cut-Out Waveguide NOTE: When the tab is broken or turned off, use the another...
- Page 39 PMOR30B PMOR30R PMOR30S 7. Re-install the wire leads to the hole of the hood duct. 9. Refer to procedure of "OUTER CASE REMOVAL". And 8. Connect the wire leads to the fan motor and chassis reverse their procedure. And re-install the outer case.
- Page 40 PMOR30B PMOR30R PMOR30S 7. Disconnect the wire leads from the relay RY1. 17.Release the nine (9) tabs holding the key fixing plate to 8. Disconnect the connectors CN-A, CN-B, CN-F, CN-E the control panel. and CN-H from the control unit.
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Page 41: Door Replacement
PMOR30B PMOR30R PMOR30S following adjustment should be made. 2. The contact of primary interlock switch and secondary 5. Loosen the two (2) screws holding latch hook to the oven interlock switch open within 1.2mm gap between right cavity front flange. - Page 42 PMOR30B PMOR30R PMOR30S latch holes and that latch head goes through center of Note: The door on a microwave oven is designed to latch hole. act as an electronic seal preventing the leakage 2. Deviation of door alignment from horizontal line of cavity of microwave energy from oven cavity during face plate is to be less than 1.0mm.
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Page 43: Pictorial Diagram
HOOD FAN MOTOR to Chassis support right Power Supply cord 120V 60Hz N.O. Blue COM. Marking CN-F STOP SWITCH AH SENSOR OVEN OVEN LAMP & SOCKET THERMAL N.O. CUT-OUT COM. SENSOR GROUND WIRE PRIMATY to chassis support INTERLOCK SWITCH STIRRER MOTOR 2 BLK CONTROL UNIT (LSI UNIT) -
Page 44: Power Unit Circuit
PMOR30B PMOR30R PMOR30S CN-A R2 91 1w R3 91 1w 2SD1859 AC120V 60Hz S1NB10 – BZ/EN MOTOR C100 CAPACITOR 7µ/230v INV. COM OVEN LAMP INV. COM FAN MOTOR N.O. OVEN LAMP STIRRER FAN MOTOR MOTOR STIRRER MOTOR TURNTABLE MOTOR TURNTABLE... -
Page 45: Lsi Unit Circuit
R10 470 1/2w KIA358FEL Q10 KTC1027 WH-1 WH-1 KTC1027 C91 0.1µ/25v R80 4.7k LED1 LED2 Ð Ð C92 0.1µ/25v CPU UNIT C93 0.1µ/25v KRC101S R41 3.32kD R42 3.57kD C94 0.1µ/25v R13 4.7k C40 0.1µ/50v 0.015µ/25v SENSOR C95 0.1µ/25v (J10) 4.7k (J11) R43 1.8kF KIA358FEL... -
Page 46: Printed Wiring Board
QKITPB032MRE0 CN - C SSR1 DOOR SW CN - E R110 C110 SP30 VRS1 C100 (J1) CN - A MOTOR RUN CAPACITOR...