Dacor PCOR30B Service Manual
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Dacor PCOR30B Service Manual

Dacor PCOR30B Service Manual

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PCOR30B shown
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 ................................................................................................................................5
PRODUCT SPECIFICATIONS ...............................................................................................................................6
GENERAL INFORMATION ...................................................................................................................................6
OPERATION .........................................................................................................................................................8
TROUBLESHOOTING GUIDE ............................................................................................................................. 16
TEST PROCEDURE ............................................................................................................................................ 19
TOUCH CONTROL PANEL ASSEMBLY ............................................................................................................. 30
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE .................................................................. 36
PICTORIAL DIAGRAM ........................................................................................................................................ 45
LSI UNIT CIRCUIT ............................................................................................................................................... 46
PRINTED WIRING BOARD ................................................................................................................................. 47
PARTS LIST ........................................................................................................................................................ 48
PACKING AND ACCESSORIES ......................................................................................................................... 53
distinctive appliances
SERVICE MANUAL
MIX CONV
DEFROST
SENSOR
TURNTABLE ON OFF COOK LBS
OZ
KG
HELP
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.
S82M196PCOR3E
MICROWAVE OVEN
PCOR30B
PCOR30R
PCOR30S
PCOR30B
PCOR30R
PCOR30S
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  • Page 1: Table Of Contents

    MODELS PCOR30R PCOR30S PCOR30B shown 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 PCOR30B PCOR30R PCOR30S NOTES:...

  • Page 4: Microwave Measurement Procedure

    PCOR30B PCOR30R PCOR30S MICROWAVE MEASUREMENT PROCEDURE (USA) A. Requirements: 1) Microwave leakage limit (Power density limit): The power density of microwave radiation emitted by a microwave oven should not exceed 1mW/cm at any point 5cm or more from the external surface of the oven, measured prior to acquisition...
  • Page 5 PCOR30B PCOR30R PCOR30S MICROWAVE MEASUREMENT PROCEDURE (CANADA) After adjustment of the door switches are completed individually or collectively, switch test and microwave leakage test must be performed with survey instrument and test result must be confirmed to meet the requirement of the performance standard for microwave ovens as undermentioned.

  • Page 6: Warning To Service Personnel

    PCOR30B PCOR30R PCOR30S 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) High Voltage Capacitor, High Voltage Power Trans- former, Magnetron, High Voltage Rectifier Assem- bly, High Voltage Harness etc..

  • Page 7: Foreword And Warning

    PCOR30B PCOR30R PCOR30S OPERATION FOREWORD This Manual has been prepared to provide Dacor Service Personnel with TROUBLESHOOTING GUIDE AND Operation and Service Information for the DACOR MICROWAVE OVENS, TEST PROCEDURE PCOR30B, PCOR30R & PCOR30S. It is recommended that service personnel carefully study the entire text...

  • Page 8: Product Specifications

    PCOR30B PCOR30R PCOR30S SPECIFICATION ITEM DESCRIPTION Power Requirements 120 Volts / 13.2 Amperes (Microwave), 13.2 Amperes (Convection) - [UL Rating] 116 Volts / 13.2 Amperes (Microwave), 13.2 Amperes (Convection) - [CSA Rating] 60 Hertz Single phase, 3 wire grounded Power Output...
  • Page 9 PCOR30B PCOR30R PCOR30S 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 branch circuit, using a grounded receptacle.

  • Page 10: Operation

    PCOR30B PCOR30R PCOR30S OPERATION DESCRIPTION OF OPERATING SEQUENCE primary interlock relay, door sensing switch, The following is a description of component functions during secondary and third door switch open their contacts, oven operation. and then the monitor switch contacts close.
  • Page 11 PCOR30B PCOR30R PCOR30S zero. 1. The coil of shut-off relays (RY1, RY4, RY5 and RY7) are 2. The shut-off relays (RY1, RY4, RY5 and RY7) are energized, energized, the oven lamp, turntable motor, cooling fan turning on the oven lamp, turntable motor, cooling fan motor and convection motor are turned on.
  • Page 12 PCOR30B PCOR30R PCOR30S The time of supplementary cooking is determined by experi- automatically compute the oven temperature, microwave ment with each food category and inputted into the LSI. power and cooking time for broiling, roasting and baking. Set An example of how sensor works: the desired program by touching one of the COMPU BROIL, COMPU ROAST or COMPU BAKE pad, and number pad.
  • Page 13 PCOR30B PCOR30R PCOR30S the relays to the power transformer and fan motor. The LSI 3. RE-CIRCULATION (INSIDE VENTING) also stops counting down and closes the damper door so The air handing is same as VERTICAL VENTING except that no fresh air will enter the oven cavity.
  • Page 14 PCOR30B PCOR30R PCOR30S SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED. 2. CLOCK APPEARS ON DISPLAY. SECONDARY MAGNETRON FUSE INTERLOCK TEMPERATURE FUSE SWITCH THIRD DOOR HEATING SWITCH ELEMENT CONVE- CTION MONITOR MOTOR OVEN SWITCH LAMP HOOD FAN THERMAL DOOR POWER...
  • Page 15 PCOR30B PCOR30R PCOR30S SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED. 2. CONVECTION PAD TOUCHED. 3. DESIRED TEMP. TOUCHED. 4. START PAD TOUCHED. MAGNETRON SECONDARY FUSE TEMPERATURE INTERLOCK FUSE SWITCH THIRD DOOR HEATING SWITCH ELEMENT CONVE- CTION MONITOR MOTOR OVEN...
  • Page 16 PCOR30B PCOR30R PCOR30S DESCRIPTION AND FUNCTION OF COMPONENTS DOOR OPEN MECHANISM opening the door, each of these switches operate inversely.) 3. If the door is opened, and the secondary interlock relay, The door is opened by pushing the open button on the control primary switch and secondary switch contacts fail to panel, refer to the Figure D-1.
  • Page 17 PCOR30B PCOR30R PCOR30S Damper Operation STIRRER MOTOR 1. When power supply cord is plugged in: 1-1. When power supply cord is plugged in, a signal is The stirrer motor drives the stirrer fan to stir the microwave sensed in the control unit, and operates shut-off relay radiation from the waveguide.

  • Page 18: Troubleshooting Guide

    PCOR30B PCOR30R PCOR30S TROUBLESHOOTING GUIDE Never touch any part in the circuit with your hand or an uninsulated tool while the power supply is connected. When troubleshooting the microwave oven, it is helpful to follow the Sequence of Operation in performing the checks. Many of the possible causes of trouble will require that a specific test be performed.
  • Page 19 PCOR30B PCOR30R PCOR30S TROUBLESHOOTING GUIDE When troubleshooting the microwave oven, it is helpful to follow the Sequence of Operation in performing the checks. Many of the possible causes of trouble will require that a specific test be performed. These tests are given a procedure letter which will be found in the "Test Procedure"...
  • Page 20 HOOD FAN MOTOR DAMPER MOTOR CONVECTION HEATER CHECKING TEMPERATURE CONTROL UNIT KEY UNIT RELAY (RY1) RELAY (RY2) RELAY (RY3) RELAY (RY4) RELAY (RY5) RELAY (RY6) RELAY (RY7) RELAY (RY8) RELAY (RY9) RELAY (RY10) FOIL PATTERN ON PWB. AH SENSOR OVEN LAMP OR SOCKET FAN MOTOR TURNTABLE MOTOR STIRRER MOTOR...

  • Page 21: Test Procedure

    PCOR30B PCOR30R PCOR30S 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. Discharge high voltage capacitor. 4. 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.
  • Page 22 PCOR30B PCOR30R PCOR30S TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER HIGH VOLTAGE RECTIFIER TEST 1. Disconnect the power supply cord, and then remove outer case. 2. Open the door and block it open. 3. Discharge high voltage capacitor. 4. Isolate the rectifier from the circuit. Using the highest ohm scale of the meter, read the resistance across the terminals and observe, reverse the leads to the rectifier terminals and observe meter reading.
  • Page 23 PCOR30B PCOR30R PCOR30S TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER PRIMARY INTERLOCK RELAY (RY2) 1. Disconnect the power supply cord, and then remove outer case. 2. Open the door and block it open. 3. Discharge high voltage capacitor. 4. Disconnect two (2) wire leads from the male tab terminals of the Primary Interlock Relay. Check the state of the relay contacts using a ohmmeter.
  • Page 24 PCOR30B PCOR30R PCOR30S TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER BLOWN MONITOR FUSE 1. Disconnect the power supply cord, and then remove outer case. 2. Open the door and block it open. 3. Discharge high voltage capacitor. 4. If the monitor fuse is blown when the door is opened, check the primary interlock relay, secondary interlock switch and monitor switch according to the "TEST PROCEDURE"...
  • Page 25 PCOR30B PCOR30R PCOR30S TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER HOOD FAN MOTOR TEST 1. Disconnect the power supply cord, and then remove outer case. 2. Open the door and block it open. 3. Discharge high voltage capacitor. 4. If the motor does not turn, touch the HOOD FAN button once (set hood fan motor power "HIGH") and check voltage between pins "1"...
  • Page 26 PCOR30B PCOR30R PCOR30S TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER CHECKING TEMPERATURE IN THE CONVECTION MODE 1. Disconnect the power supply cord, and then remove outer case. 2. Open the door and block it open. 3. Discharge high voltage capacitor. 4. It is difficult to measure the exact temperature in the convection oven. An accurate thermocouple type temperature tester must be used.
  • Page 27 PCOR30B PCOR30R PCOR30S TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER TOUCH CONTROL PANEL ASSEMBLY TEST 2. Control Unit. The following symptoms indicate a defective control unit. Before replacing the control unit, perform the Key unit test (Procedure R) to determine if control unit is faulty.
  • Page 28 PCOR30B PCOR30R PCOR30S TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER RELAY TEST 1. Disconnect the power supply cord, and then remove outer case. 2. Open the door and block it open. 3. Discharge high voltage capacitor. 4. Disconnect the leads to the primary of the power transformer.
  • Page 29 PCOR30B PCOR30R PCOR30S TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 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 on the PWB, this foil pattern acts as a fuse.
  • Page 30 PCOR30B PCOR30R PCOR30S TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER Water load cooking test Make sure the oven has been plugged in at least five minutes before checking sensor cook operation. The cabinet should be installed and screws tightened. (1) Fill approximately 200 milliliters (7.2 oz) of tap water in a 1000 milliliter measuring cup.
  • Page 31 PCOR30B PCOR30R PCOR30S TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER NOISE FILTER TEST 1. Disconnect the power supply cord, and then remove outer case. 2. Open the door and block it open. 3. Discharge high voltage capacitor. 4. Disconnect the leads to the primary of the power transformer.

  • Page 32: Touch Control Panel Assembly

    PCOR30B PCOR30R PCOR30S TOUCH CONTROL PANEL ASSEMBLY OUTLINE OF TOUCH CONTROL PANEL The touch control section consists of the following units 3) Synchronizing Signal Circuit as shown in the touch control panel circuit. The power source synchronizing signal is available in...
  • Page 33 PCOR30B PCOR30R PCOR30S DESCRIPTION OF LSI LSI(IZA719DR) The I/O signals of the LSI(IZA719DR) are detailed in the following table. Pin No. Signal Description Connected to GND. Anode (segment) of Fluorescent Display illumination voltage: -31V. Vp voltage of power source circuit input.
  • Page 34 PCOR30B PCOR30R PCOR30S Pin No. Signal Description Convection motor driving signal. During cooking To turn on and off shut-off relay(RY7). "L" level during (Convection) CONVECTION; "H" level otherwise. Hood lamp driving signal. H : GND To turn on and off relay(RY8). "L" level: During Hood lamp ON.
  • Page 35 PCOR30B PCOR30R PCOR30S Pin No. Signal Description XOUT Internal clock oscillation frequency control output. Output to control oscillation input of XIN. Power source voltage:-5V. VC voltage of power source circuit input. Signal coming from touch key. When any one of G12 line keys on key matrix is touched, a corresponding signal will be input into P27.
  • Page 36 PCOR30B PCOR30R PCOR30S Pin No. Signal Description Key strobe signal. Signal applied to touch-key section. A pulse signal is input to AN1 and P27 - P24 terminal while one of G2 line keys on key matrix is touched. Segment data signal.
  • Page 37 PCOR30B PCOR30R PCOR30S SERVICING (sensor-related ones included) of the touch control panel 1. Precautions for Handling Electronic Components while keeping it connected to the oven. This unit uses CMOS LSI in the integral part of the circuits. B. On some models, the power supply cord between the...

  • Page 38: Component Replacement And Adjustment Procedure

    PCOR30B PCOR30R PCOR30S 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) High Voltage Capacitor, Power Transformer, Magnetron, High Voltage Rectifier Assembly, High Voltage Harness etc..
  • Page 39 PCOR30B PCOR30R PCOR30S REMOVAL OF OVEN FROM WALL (Two persons recommended to remove the oven) 1. Disconnect the power supply cord, and uncoil the power plate. supply cord. 6. Lower the front of the oven and pull the power cord out of 2.
  • Page 40 PCOR30B PCOR30R PCOR30S 10.Now, the hood fan motor is free. 18.Remove two (2) screws holding the AH sensor assembly 11.Remove the hood exhaust duct from the oven cavity by to the exhaust duct. lifting it up 19.Now, the AH sensor assembly and the exhaust duct are 12.Screw the oven lamp off from the lamp socket.
  • Page 41 PCOR30B PCOR30R PCOR30S COOLING FAN MOTOR REMOVAL 10.Release the fan duct assembly from the oven cavity. 1. Disconnect the power supply cord, remove the oven from 11.Remove the fan blade from the fan motor shaft according wall and remove outer case, remove the unit mounting the following procedure.
  • Page 42 PCOR30B PCOR30R PCOR30S TURNTABLE MOTOR AND COUPLING REMOVAL 1. Disconnect the power supply cord. 5. Disconnect the wire leads from the turntable motor. 2. Open the door and block it open. 6. Remove two (2) screws holding turntable motor to the 3.
  • Page 43 PCOR30B PCOR30R PCOR30S 15.Remove the one (1) screw holding the key fixing plate to 4. Insert the bottom edge of the display board under the tab the control panel. of control panel as shown in step 4. 16.Release the four (4) tabs holding the key fixing plate to the 5.
  • Page 44 PCOR30B PCOR30R PCOR30S CONVECTION DUCT ASSEMBLY REMOVAL 1. Disconnect power supply cord, remove the oven from wall NOTE: After installed the heating element completely, and remove outer case. (Refer to procedure of "Removal bent top of the heating element holder to inside of Oven from Wall"...
  • Page 45 PCOR30B PCOR30R PCOR30S 4. Make sure that the monitor switch is operating properly diagram. and check continuity of the monitor circuit. Refer to 3. Secure the latch hook (with two (2) mounting screws) to chapter "Test Procedure" and "Adjustment procedure".
  • Page 46 PCOR30B PCOR30R PCOR30S microwave energy from oven cavity during cook 6. Re-install the door stopper to the door assembly. 7. Re-install the sash left to the oven cavity front face plate. cycle. This function does not require that door be 8.

  • Page 47: Pictorial Diagram

    AH. SENSOR HOOD FAN MOTOR 2 RED CN-F Power Supply cord 120V 60Hz CN-E TEMPERATURE FUSE (MG.) N.O. STIRRER MOTOR to oven cavity COM. front flange DOOR SENSING SWITCH THERMAL CUT-OUT CONVECTION RY2:Primary Interlock Relay MOTOR HEATING ELEMENT Blue COM. Marking CN-G CN-E...

  • Page 48: Lsi Unit Circuit

    CONTROL UNIT NOTE D1-D4 : 11ES1 : IF NOT SPECIFIEED, 1/4w ± 5% AC120V : IF NOT SPECIFIEED, 1SS270A 60Hz DTA123ES : IF NOT SPECIFIEED, 0.01µF/16v – – C10 0.1µ/50v (VP) C100 R4 510 1/2w Q1 2SB1238 MOTOR RUN R3 680 1w R90 100k CAPACITOR KRA101M...

  • Page 49: Printed Wiring Board

    PCOR30B PCOR30R PCOR30S TAPE R100 ,BFB (D65) (R65) (C65) CN - E (JA) OVEN LAMP RY10 VRS1 CN - B CN - A CONV DAMP FAN.M T T M AC (N) MOTOR CAPACITOR...

  • Page 50: Parts List

    PCOR30B PCOR30R PCOR30S distinctive appliances COPYRIGHT © 2002 BY DACOR, INC. ALL RIGHTS RESERVED. No part of this publication may be reproduced, stored in retrieval systems, or transmitted in any form or by any means, electronic, me- chanical, photocopying, recording, or other- wise, without prior written permission of the publisher.

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