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MO30 STA NE Installation, Use & Care Manual 2015

1. 10 TROUBLESHOOTING GUIDE t peus eee etna cuc 14 TEST 15 COMPONENT REPLACEMENT AND ADJUSTMENT 2 26 PICTORIAL DIAGRAM m 32 ii detur Tra 33 PACKING AND ACCESSORIES 37 This document has been published to be used for after sales service only The contents are subject to change without notice 5 PRECAUTIONS BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY a Do not operate or allow the oven to be operated with the door open b Make the following safety checks on all ovens to be serviced before activating the magnetron or other microwave source and make repairs as necessary 1 interlock operation 2 proper door closing 3 seal and sealing surfaces arcing wear and other damage 4 damage to or loosening of hinges and latches 5 evidence of dropping or abuse c Before turning on microwave power for any service test or inspection within the microwave generating compartments check the magnetron wave guide or transmission line and cavity for proper alignment integrity and connections
2. 0 5 MISCELLANEOUS 68 0 5 PACKING AND ACCESSORIES TOP PAD ASSEMBLY DOOR PROTECTION SHEET 6 4 TURNTABLE TRAY PLASTIC BAG 7 OF THE OVEN TRAY HOLDER 2 ANS OPERATION MANUAL BOTTOM PAD ASSEMBLY PACKING CASE Non replaceable items 37 0 5 NOTES 38 5 5 39 0 5 COPYRIGHT 2011 BY BERTAZZONI 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 mechanical photocopying recording or otherwise without prior written permission of the publisher
3. e14019Id 71 5 91 4 AH 5 1 LINN HOLIMS V 9 MOOTHSLNI p ooo HOLON HOLIMS o LINN 157 LINN TOHINOO LINN H3MOd Aiddns samod ay uo yew Nu V NO OL euruJe y pejoeuuoo eq 291 LON ZHO9 4409 5 dsna NOYLIN YW AlddNS 3Sfd ALIAVO 3460 1dox 5 5 9 p109 Ajddns Jamod Aq
4. Cavity Light Yes Safety Standard CUL Listed FCC Authorized DHHS Rules CFR Title 21 Chapter 1 Subchapter J and Canadian Standards Association Health CANADA GENERAL INFORMATION GROUNDING INSTRUCTIONS This oven is equipped with a three prong grounding plug It must be plugged into a wall receptacle that is properly installed and grounded in accordance with the National Electrical Code and local codes and ordinances In the event of an electrical short circuit grounding reduces the risk of electric shock by providing an escape wire for the electric current WARNING Improper use of the grounding plug can result in a risk of electric shock Electrical Requirements The electrical requirements are a 120 volt 60 Hz AC only 15 or 20 amp fused electrical supply It is recommended that a separate circuit serving only this appliance be provided When installing this appliance observe all applicable codes and ordinances A short power supply cord is provided to reduce risks of becoming entangled in or tripping over a longer cord MO30 STA NE Where a two pronged wall receptacle is encountered it is the personal responsibility and obligation of the customer to con tact a qualified electrician and have it replaced with a properly grounded three pronged wall receptacle or have a grounding adapter properly grounded and polarized If the extension cord must be used it should be a 3 wire 15 amp or higher rated cord Do not d
5. 5 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 by a purchaser and thereafter through the useful life of the oven 5 mW cm at any point 5cm or more from the external surface of the oven Safety interlock switches Primary interlock relay switch shall prevent microwave radiation emission in excess of the requirement as above mentioned Secondary interlock relay and door sensing switch shall prevent microwave radiation emission in excess of 5 mW cme2 at any point 5cm or more from the external surface of the oven 2 B Preparation for testing Before beginning the actual measurement of leakage proceed as follows 1 Make sure that the actual instrument is operating normally as specified in its instruction booklet Important Survey instruments that comply with the requirement for instrumentation as prescribed by the performance standard for microwave ovens 21 CFR 1030 10 c 3 i must be used for testing 2 Place the oven tray in the oven cavity 3 Place the load of 275 15 9 8 oz of tap water initially at 20 5 68 F the center of the oven cavity The water container shall be a low form of 600 ml 20 oz beaker with an inside diameter of approx
6. 0 5 BERTAZZONI SERVICE MANUAL 531 332 0305 STA 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 TABLE OF CONTENTS Page PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE 22 6 6 2 BEFORE SERVICING 2 WARNING TO SERVIGE PERSONNEL 2 22 4 MICROWAVE MEASUREMENT 2 404 000 0 00000000000000000000000000000000000000 5 FOREWORD AND WARNING uhi dera ade reae aed d emu do e eeu n e 7 PRODUC T SPECIFICATIONS 8 GENERAL INFORMATION toutou e ra tra e ce ex a ev e ree riw Rug 8 edis
7. Open the door and block it open Discharge high voltage capacitor Reconnect the leads to the primary of the power transformer Reinstall the outer case cabinet Reconnect the power supply cord after the outer case is installed Run the oven and check all functions NOOR 0 5 Check RE Replace TEST PROCEDURE RE POSSIBLE CAUSE AND DEFECTIVE PARTS SECONDARY INTERLOCK SYSTEM PRIMARY INTERLOCK RELAY MONITOR SWITCH BLOWN MONITOR SWITCH TEST COOLING FAN MOTOR CAVITY TEMPERATURE FUSE TURNTABLE MOTOR H V RECTIFIER ASSEMBLY HIGH VOLTAGE CAPACITOR MAGNETRON TEMP FUSE TOUCH CONTROL PANEL WRONG OPERATION SHORT IN POWER CORD LOW VOLTAGE Q SHORT OR OPENED WIRING MAGNETRON POWER TRANSFORMER DIRTY OVEN CAVITY KEY UNIT AH SENSOR NOISE FILTER RELAY COMPU DEFROST TEST CONDITION PROBLEM Home fuse or circuit breaker blows when power cord is plugged into wall receptacle Monitor fuse blows when power cord is plugged into wall receptacle Any letters or indicators do not appear in OFF display when power cord is first plugged CONDITION into wall outlet Display does not operate properly when STOP CLEAR key is touched Buzzer should sound and or time of day should appear in display Oven lamp does not light when door is opened Oven lamp does not go out when door is closed Oven lamp lights but fan motor and turntable motor do n
8. d Any defective or misadjusted components in the interlock monitor door seal and microwave generation and transmission systems shall be repaired replaced or adjusted by procedures described in this manual before the oven is released to the owner e A microwave leakage check to verify compliance with the Federal Performance Standard should be performed on each oven prior to release to the owner BEFORE SERVICING Before servicing an operative unit perform a microwave emission check as per the Microwave Measure ment Procedure outlined in this service manual If microwave emissions level is in excess of the specified limit contact BERTAZZONI immediately English Spanish 1 866 905 0010 or French 1 800561 7625 If the unit operates with the door open service person should 1 tell the user not to operate the oven and 2 contact BERTAZZONI and Food and Drug Administration s Center for Devices and Radiological Health immediately Service personnel should inform BERTAZZONI 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 DANGER CAUTION HIGH VOLTAGE Do not energize a microwave oven with the outer case cabinet removed because a microwave oven generates High Voltage in the circuit If you intend to operate the oven employing the high frequency switching power converter circuit you should
9. ueeq seu Ajddns Jamod Jo eu HOSN3S HV 0 5 PARTS LIST Note The parts marked A may cause undue microwave exposure The parts marked are used in voltage more than 250V DESCRIPTION 1 FC QZA630WRKZ High voltage assembly 2 FDTCTA198WRKO AH sensor 3 RLMPTAO96WRZZ Oven lamp FPWBFA2 92WREO Noise filter 5 4 33WRZZ Fan motor 6 5 016 onitor switch V 16G 2C25 and fuse assembly 20 250 1 7 QSW MAO 85WREO Secondary interlock switch and door sensing switch V 52300 3 8 QFS TAO13WREO agnetron temperature fuse 15 x 1 9 QFS TAO1AWREO Cavity temperature fuse 150C 1 10 RV MZA368WRZZ agnetron 1 11 RMOTDA252WRZZ Turntable motor 1 12 RTRN B094MREO Power transformer 1 13 FACCDB023MREO Power supply cord GDAI A439WRWZ Base plate GLEGPA104WREZ Foot GCABUB202WRPZ Outer case cabinet PWBFB138MRUO CPU unit PNLCB195MRKO Control panel frame assy BTN B445WRFZ Open button assy PRCA157WREZ Open button spring 5730 08 50 Screw 3mm x 8mm LBNDKA1 63WRPZ Capacitor band NGTA430WRPZ Chassis support PHOK A130WRFZ Latch hook EVPBO1L6MRFOA Switch lever UC B033WRFEZ Magnetron duct ANJ
10. take special precautions to avoid an electrical shock hazard The high voltage transformer high voltage capacitor and high voltage diode have energized high voltage potential approx 8 KV The aluminium heat sink is connected to the switching power transistor Collector pole and has an energized high voltage potential approx 650V peak DO NOT ACCESS THE HIGH VOLTAGE TRANSFORMER HIGH VOLTAGE CAPACITOR HIGH VOLTAGE DIODE AND HEAT SINK WHEN THE POWER SUPPLY IS CONNECTED TO AN ELECTRICAL OUTLET 5 Notes 5 WARNING 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 Transformer Magnetron High Voltage Rectifier Assembly High Voltage Harness etc Read the Service Manual carefully and follow all instructions Before Servicing 1 Disconnect the power supply cord then remove outer case 2 Open the door and block it open 3 Discharge high voltage capacitor WARNING RISK OF ELECTRIC SHOCK DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE SERVICING The high voltage capacitor remains charged about 60 seconds after the oven has been switched off Wait for 60 seconds and then short circuit the connection of the high voltage capacitor that is the connecting lead of the hi
11. 8 5 cm 3 1 2 in and made of an electrically nonconductive material such as glass or plastic The placing of this standard load in the oven is important not only to protect the oven but also to insure that any leakage is measured accurately 4 Set the cooking control on Full Power Cooking Mode 5 Close the door and select a cook cycle of several minutes If the water begins to boil before the survey is completed replace it with 275 ml of cool water C Leakage test Closed door leakage test microwave measurement 1 Grasp the probe of the survey instrument and hold it perpendicular to the gap between the door and the body of the oven 2 Move the probe slowly not faster than 1 in sec 2 5 cm sec along the gap watching for the maximum indication on the meter 3 Check for leakage at the door screen sheet metal seams and other accessible positions where the continuity of the metal has been breached eg around the switches indicator and vents While testing for leakage around the door pull the door away from the front of the oven as far as is permitted by the closed latch assembly 4 Measure carefully at the point of highest leakage and make sure that the highest leakage is no greater than 4mW cm and that the primary interlock switch secondary interlock relay does turn the oven OFF before any door movement NOTE After servicing record data on service invoice and microwave leakage report SERVICE
12. Allow the water to heat for 60 seconds measuring with a stop watch second hand of a watch or the digital read out countdown 3 Remove the cup from the oven and again measure the temperature making sure to stir the thermometer or thermocouple through the water until the maximum temperature is recorded 4 Subtract the cold water temperature from the hot water temperature The normal result should be 38 to 78 F 21 to 42 6 C rise in temperature If the water temperatures are accurately measured and tested for the required time period the test results will indicate if the magnetron tube has low power output low rise in water temperature which would extend cooking time or high power output high rise in water temperature which would reduce cooking time Because cooking time can be adjusted to compensate for power output the magnetron tube assembly should be replaced only if the water temperature rise test indicates a power output well beyond the normal limits The test is only accurate if the power supply line voltage is 120 volts and the oven cavity is clean POWER TRANSFORMER TEST Disconnect the power supply cord and then remove outer case Open the door and block it open Discharge high voltage capacitor Disconnect the primary input terminals and measure the resistance of the transformer with an ohmmeter Check for continuity of the coils with an ohmmeter On the x 1 scale the resistance of the primary coil should be les
13. MECHANISM The door is opened by pushing the open button on the con trol panel refer to the Figure D 1 When the open button is pushed the open button pushes up the switch lever and then the switch lever pushes up the latch head The latch heads are moved upward and released from latch hook Now the door will open Latch Heads Door Sensing Switch Door Monitor Switch Secondary Switch 9 Switch Lever Primary Switch Figure D 1 Door Open Mechanism PRIMARY SWITCH SECONDARY SWITCH amp DOOR SENSING SWITCH The primary switch and secondary switch mounted parrallel to each other horizontally in the lower positions of the latch hook the door sensing switch is mounted horizontally in the upper position of the latch hook They are activated by the latch head on the door When the door is opened the switches interrupt the power to all high voltage components except the oven lamp A cook cycle cannot take place un til the door is firmly closed thereby activating all interlock switches The secondary interlock system consists of the door sensing switch and the secondary interlock relay located on the control circuit board MONITOR SWITCH The monitor switch is activated the contacts opened by the latch head on the door while the door is closed The switch is intended to render the oven inoperative by means of blowing the monitor fuse when the contacts of
14. SWEN 8 RELAY L H V RECTIFIER CONTROL UNIT MAGNETRON 477 477 9 6 NOISE FILTER UNIT Figure O 1 Oven Schematic Off Condition SCHEMATIC NOTE CONDITION OF OVEN 1 DOOR CLOSED NOTE 1 CIRCUITS SUBJECT TO CHANGE WITHOUT NOTICE 2 WIRE COLOR CODES ARE APPLICABLE TO PRIMARY CIRCUIT ONLY AND NOT 2 APPLICABLE TO LOW VOLTAGE CIRCUIT AND SECONDARY CIRCUIT 3 HOTWIRE S MUST BE CONNECTED TO THE TERMINAL WITH BLUE MARK 3 VARIABLE COOKING CONTROL HIGH ON THE LAMP SOCKET AND H MARK ON THE POWER SUPPLY CORD 4 START PAD TOUCHED SECONDARY PRIMARY SWITCH SWITCH uo 22 T e e e e gt 0 oo 5 2 NN E z S 5 e s 2 2 oL FM 5 CAPACITOR 1 0 5 2300V a 9 SENSING fp E lt SWITCH a hd o o 8 SER 9 E 5 5 25 ve e E 2 55 77 amp 3 52 y a 7 2 5 120v AC N 9 E 5 TRANSFORMER ri j E g gt Z z z 77775 B N C 2 Omonitor lt 8 SECONDARY 3 INTERLOCK i S RELAY COM lee 1 RECTIFIER CONTROL UNIT MAGNETRON e e e FILTER Figure O 2 Oven Schematic Cooking Condition 12 DESCRIPTION AND FUNCTION OF COMPONENTS DOOR OPEN
15. at AN5 terminal 16 seconds after the unit has been put in the Sensor Cooking mode if it is not possible to balance of the bridge circuit due to disconnection of the absolute humidity sensor ERROR will appear on the display and the cooking is stopped 1 Absolute humidity sensor circuit C Thermistor in closed vessel S Thermistor in open vessel 15V VA 15V VC 5V 5 COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE WARNING AGAINST HIGH VOLTAGE result in severe possibly fatal electric shock Example etc Microwave ovens contain circuitry capable of producing very high voltage and current contact with following parts may High Voltage Capacitor Power Transformer Magnetron High Voltage Rectifier Assembly High Voltage Harness ing the oven Avoid possible exposure to microwave energy Please follow the instructions below before operat 1 Disconnect the power supply cord Make sure that a definite click can be heard when the microwave oven door is unlatched Hold the door in a closed position with one hand then push the door open button with the other this causes the latch leads to rise it is then possible to hear a click as the door switches operate Visually check the door and cavity face plate for damage dents cracks signs of arcing etc Carry out any remedial work that is necessary before operating the oven
16. not come off even if the wire leads are pulled To prevent an error function connect the wire leads correctly referring to the Pictorial Diagram Please refer to OVEN PARTS CABINET PARTS CONTROL PANEL PARTS DOOR PARTS when carrying out any of the following removal procedures OUTER CASE REMOVAL To remove the outer case proceed as follows 1 Disconnect the power supply cord 2 Open the oven door and block it open 3 Remove the two 2 screws from the lower portion of the rear cabinet using a T20H Torx type or GTXH20 100 Screw driver 4 Remove the remaining three 3 screws from rear and four 4 screws along the right amp left sides of outer case Slide the entire outer case back out about 1 inch 3 cm to free it from retaining clips on the cavity face plate Lift entire outer case from the unit b CAUTION 1 DISCONNECT OVEN FROM POWER SUP PLY BEFORE REMOVING OUTER CASE 2 DISCHARGE THE HIGH VOLTAGE CA PACITOR BEFORE TOUCHING ANY OVEN COMPONENTS OR WIRING NOTE When replacing the outer case the 2 special Torx screws must be reinstalled the same locations MO30 STA NE n Screw Driver Type TORX T20 H or GTXH20 100 POWER TRANSFORMER REMOVAL Re install 1 Rest transformer on the bottom plate with its primary Disconnectthe power supply cord and then remove outer case Open the oven door and block it open Discharge high vol
17. properly 10 11 12 13 14 15 16 17 Sensor Dummy Resistor Circuit Plunger NC NO To connector on Control Ua 2 CONNECTOR R1 R2 220 1 1 2W 4 3kQ 5 1 4W R4 1MQ 5 1 4W Sensor Dummy Resistor Circuit 23 5 TEST PROCEDURES een COMPONENT TEST N NOISE FILTER TEST Disconnect the power supply cord and then remove outer case Open the door and block it open Discharge high voltage capacitor Disconnect the leads to the primary of the power transformer Using an ohm meter check between the terminals as described in the following table N NOISE FILTER UNIT H adc MONITOR 0 22uF AC 250V FUSE e NOISE SUPPRESSION COIL l e e hi 55 LINE BYPASS CAPACITOR LINE BYPASS CAPACITOR o 0 0033uF 0 0033uF e E os __ a _ a l LOAD LOAD MEASURING POINT INDICATION OF OHM METER Between N and H Open Circuit Between terminal N and GRY Short Circuit Between terminal H and RED Short Circuit If incorrect readings are obtained replace the noise filter Reconnect all leads removed from components during testing Re install the outer case cabinet Reconnect the power supply cord after the outer case is installed Run the oven and check all functions OND 24 5 ABSOLUTE HUMI
18. sen SOr 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 Remove the AH sensor 5 Install the new AH sensor 6 Reconnect all leads removed from components during testing 7 8 9 Re install the outer case cabinet Reconnect the power supply cord after the outer case is installed Reconnect the oven to the power supply and check the sensor cook operation as follows 9 1 Fill approximately 200 milliliters 7 2 oz of tap water 1000 milliliter measuring cup 9 2 Place the container on the center of tray in the oven cavity 9 3 Close the door 9 4 Touch the Timer Clock pad once the Power Level pad twice the Start pad once and the number 1 pad once 9 5 Now the oven is in the sensor cooking condition and TEST SENSOR will appear in the display 9 6 The display will start to count down the remaining cooking time and the oven will turn off automatically after the water is boiling bubbling If new sensor does not operate properly the problem is with the control unit and refer to explanation below 22 0 5 TEST PROCEDURES be COMPONENT TEST CHECKING CONTROL UNIT 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 sensor connector that is mounted to control pane
19. the door closed 6 Secure the screws with washers firmly 7 Check the operation of all switches If each switch has not activated with the door closed loosen screw and adjust the latch hook position After adjustment check the following 1 In and out play of door remains less than 0 5mm when in the latched position First check upper position of latch hook pushing and pulling upper portion of door toward the oven face Then check lower portion of the latch and check continuity of the monitor circuit Refer to chapter Test Procedure and Adjustment procedure hook pushing and pulling upper portion of door toward the oven face Both results play in the door should be less than 0 5mm 2 The door sensing switch primary switch and secondary switch interrupt the circuit before the door can be opened 3 Monitor switch contacts close when door is opened 4 Re install outer case and check for microwave leakage around door with an approved microwave survey meter Latch Heads Door Sensing Switch Door Monitor Switch 2 4 SB Secondary Switch Lever Switch Primary Switch Figure C 3 Latch Switch Adjustments DOOR REPLACEMENT REMOVAL 1 Disconnect the power supply cord 2 Push the open button and open the door 3 Remove door stopper then release two 2 pins of door panel from two 2 holes of upper and lower oven hinges by li
20. the fan motor because the rotor is easily shaven by pliers and metal pieces may be produced Do not touch the pliers to the coil of the fan motor because the coil may be cut or injured Do not disfigure the bracket by touching with the pliers 8 Remove the fan blade from the shaft of the fan motor by pulling and rotating the fan blade with your hand 9 Now the fan blade and the fan motor will be free Coil Tel Remove the two 2 screws holding the fan motor to the Th mese are the positions CAUTION Do not reuse the removed fan blade because the hole for shaft may be larger than normal INSTALLATION 1 Install the fan blade to the fan motor shaft according to the following procedure 2 Hold the center of the bracket which supports the shaft of the fan motor on the flat table 3 Apply the screw lock tight into the hole for shaft of the fan blade 4 Install the fan blade to the shaft of fan motor by pushing the fan blade with a small light weight ball peen hammer or rubber mallet CAUTION Do not hit the fan blade strongly when installed because the bracket may be disfigured Make sure that the fan blade rotates smooth after installation Make sure that the axis of the shaft is not slanted 5 Install the fan motor to the the oven cavity back plate with the
21. the primary switch fail to open when the door is opened Functions 1 When the door is opened the monitor switch contact close to the ON condition due to their being normally closed At this time the secondary interlock relay primary switch and secondary switch are in the OFF condition contacts open due to their being normally open contact switches 2 Asthe door goes to a closed position the monitor switch contacts are first opened and then the door sensing switch primary switch and secondary switch contacts close On opening the door each of these switches operate inversely MO30 STA NE 3 If the door is opened primary switch and contacts fail to open the monitor fuse blows simultaneously with closing of the monitor switch contacts CAUTION BEFORE REPLACING A BLOWN MONITOR FUSE TEST MONITOR SWITCH AND PRIMA RY SWITCH FOR PROPER OPERATION RE FER TO CHAPTER TEST PROCEDURE NOTE MONITOR FUSE AND MONITOR SWITCH ARE REPLACED AS AN ASSEMBLY TURNTABLE MOTOR The turntable motor rotates the turntable located on the bottom of the oven cavity so that the foods on the turntable cook evenly during cooking The turntable may turn in either direction COOLING FAN MOTOR The cooling fan motor drives a blade which draws external cool air This cool air is directed through the air vanes sur rounding the magnetron and cools the magnetron This air is channelled through the oven cavity to remove steam and vapors
22. two 2 screws 6 Connect the wire leads to the fan motor referring to the pictorial diagram Shaft Center of 1 Insert the new AH sensor into the sensor duct Groove joint pliers N Stator Shaft Axis that should pinched Bracket Rotor pliers Rotor Rear View Side View AH SENSOR REPLACEMENT REMOVAL RE INSTALL 1 Disconnect the power supply cord and remove outer case 2 Open the door and block it open 3 Discharge high voltage capacitor 4 Remove the two 2 screws holding the AH sensor to the sensor duct 5 Disconnect the AH sensor harness from the connector CN F on control unit 2 Install two 2 screws to secure the AH sensor 3 Route the AH sensor harness across the oven cavity top plate and through the large opening 4 Connect the AH sensor harness to CN F on control unit 5 Re install the outer case cabinet and check for proper DOOR SENSING SWITCH PRIMARY SWITCH SECONDARY SWITCH AND MONITOR SWITCH REMOVAL Disconnect the power supply cord and remove outer case Open the door and block it open Discharge high voltage capacitor Disconnect wire leads from the switches Remove two 2 screws holding latch hook to oven flange Remove latch hook assembly from oven flange Push outward on the two 2 retaining tabs
23. unit with an A C voltmeter The meter should indicate 120 volts if not check oven circuit RY1 and RY2 Relay Test These relays are operated by D C voltage Check voltage at the relay coil with a D C voltmeter during the microwave cooking operation DC voltage indicated Defective relay DC voltage not indicated Check diode which is connected to the relay coil If diode is good control unit is defective RELAY SYMBOL OPERATIONAL VOLTAGE CONNECTED COMPONENTS RY1 Approx 24 0V D C Oven lamp Turntable motor Cooling fan motor RY2 Approx 23 0V D C Power transformer 8 Disconnect the power supply cord and then remove outer case 9 Open the door and block it open 10 Discharge high voltage capacitor 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 14 Run the oven and check all functions NO L COMPU DEFROST TEST WARNING The oven should be fully assembled before following procedure 1 Place one cup of water in the center of the turntable tray in the oven cavity 2 Close the door touch the Defrost pad and touch the number pad 5 twice Then touch the start pad 3 The oven is in Compu Defrost cooking condition 4 The oven will operate as follows 1ST STAGE 2ND STAGE WEIGHT MEVEL LEVEL TIME 0 516 70 45 40 15sec 5 If improper operat
24. AO 60WRFZ Fan blade Fan duct Oven cavity Not a replaceable part Waveguide cover Turntable motor packing Sensor duct Baseplate cushion Mag cushion Fan motor cushion C P cavity cushion Fan duct cushion CO a ES 4 65W PACGAO 8 4W C B031W SGA630W SGA731W SGA730W SGA72 9W SUA278W D DVDD 33 5 PARTNO DESCRIPTION CDORFB567MRKO Door assembly LSTPPB0O21MRFO Latch head MS PRTAO4 6WREO atch spring GCOVHB047MREO Choke cover LSTPPB045MRFO Door stopper TCADUBO18MRRO Recipe card FW VZC288WREZ ain wire harness FROLPA117WRKZ Turntable support NTNT A099WREO Turntable tray TCAUAA292WRRZ onitor caution label TCAUABO33MRRO DHHS Screw caution label TINSLBO19MRRO Operation manual QW QZBO16MREO High voltage wire A TCAUAB048MRRO DHHS GRD BIK caution TCAUABO75MRRO Health Canada label l CAUHB008MRRO User caution label LAB B191WRRZ enu label XHPS74 LX CZ0 0P08000 Special screw 052WREO Special screw XHTS740P12RVO Screw 4mm x 12mm XCBS730P08000 Screw XOTS740P12000 Screw 4mm x 12mm XCBS730P08000 Screw 3mm x 8mm LX CZAO XHTS740 XOTS840 7OWREO Special screw Screw 4mm x 8mm P08000 Screw 4mm x 12mm o000 10Y01 5 C WU 34 0 5 OVEN AND CABINET PARTS
25. DITY SENSOR CIRCUIT 1 Structure of Absolute Humidity Sensor The absolute humidity sensor includes two thermistors as shown in the illustration One thermistor is housed in the closed vessel filled with dry air while another in the open vessel Each sensor is provided with the protective cover made of metal mesh to be protected from the external airflow Thermistors ventilation opening for sensing Sensing part Open vessel Sensing part Closed vessel OE 2 Operational Principle of Absolute Humidity Sensor The figure below shows the basic structure ofan absolute humidity sensor A bridge circuit is formed by two thermistors and two resistors R1 and R2 The output of the bridge circuit is to be amplified by the operational amplifier Each thermistor is supplied with a current to keep it heated at about 150 C 302 F the resultant heat is dissipated in the air and if the two thermistors are placed in different degrees of heat conductivity leading to a potential difference between them causing an output voltage from the bridge circuit the intensity of which is increased as the absolute humidity of the air inceases Since the output is very minute it is amplified by the operational amplifier Absolute humidity vs Operational output voltage characteristic R1 amplifier Output voltage Output voltage S Thermistor open vessel C Thermistor closed vessel Ab
26. Do not operate the oven if any of the following conditions exist To prevent an electric shock take the following pre cautions 1 Before wiring 1 Disconnect the power supply cord 2 Open the door block it open 3 Discharge the high voltage capacitor and wait for 60 seconds 2 Don t let the wire leads touch to the following parts 1 High voltage parts Magnetron High voltage transformer High voltage capacitor and High voltage rectifier assembly 2 Hot parts Oven lamp Magnetron High voltage transformer and Oven cavity WARNING FOR WIRING 1 Door does not close firmly 2 Door hinge support or latch hook is damaged 3 The door gasket or seal is damaged 4 The door is bent or warped 5 There are defective parts in the door interlock system 6 There are defective parts in the microwave generating and transmission assembly 7 There is visible damage to the oven Do not operate the oven 1 Without the RF gasket Magnetron 2 If the wave guide or oven cavity are not intact 3 If the door is not closed 4 f the outer case cabinet is not fitted 3 Sharp edge Bottom plate Oven cavity Waveguide flange Chassis support and other metallic plate 4 Movable parts to prevent a fault Fan blade Fan motor Switch Switch lever Open button Do not catch the wire leads in the outer case cabinet Insert the positive lock connector until its pin is locked and make sure that the wire leads do
27. EST 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 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 Checking with a high ohm scale if the high voltage capacitor is normal the meter will indicate continuity for a short time and should indicate an open circuit once the capacitor is charged If the above is not the case check the capacitor with an ohmmeter to see if it is shorted between either of the terminals and case If it is shorted replace the capacitor Reconnect all leads removed from components during testing Reinstall the outer case cabinet Reconnect the power supply cord after the outer case is installed Run the oven and check all functions ONDA ONDA E CAVITY TEMPERATURE FUSE TEST Disconnect the power supply cord and then remove outer case Open the door and block it open Discharge high voltage capacitor A continuity check across the cavity temperature fuse terminals should indicate a closed circuit unless the temperature of the cavity temperature fuse reaches approximately 302 F 150 C An open cavity temperature fuse indicates overheating of the oven exchange the cavity temperature fuse and check inside of oven cavity and for improper setting of cooking time or operation of control unit Chec
28. HE HIGH VOLTAGE RECTIFIER MUST BE SECURED FIRMLY WITH A GROUNDING SCREW MAGNETRON REMOVAL Removal T Disconnect the power supply cord and then remove outer case Open the door and block it open Discharge high voltage capacitor Disconnect wire leads from magnetron Remove the two 2 screws holding the chassis support to the magnetron and the oven cavity front flange Slide the magnetron duct slightly so that the two 2 screws at left hand side of the magnetron appear Carefully remove the four 4 screws holding magnetron to waveguide flange Remove the magnetron with care so that the magnetron antenna is not hit by any metal object around the antenna Now the magnetron is free 27 Re install 1 2 3 4 5 Re install the magnetron to waveguide flange with care to prevent damage to the magnetron antenna Secure the magnetron with the four 4 screws Hold the chassis support to the oven cavity front plate and the magnetron with the two 2 screws Reconnect the wire leads to the magnetron Refer to PICTORIAL DIAGRAM on page 33 Re install outer case and check that oven is operating properly CAUTION WHEN REPLACING MAGNETRON BE SURE THE R F GASKET IS IN PLACE AND MOUNT ING SCREWS ARE TIGHTENED SECURELY o RON 0 STA NE OVEN LAMP AND LAMP SOCKET REMOVAL Disconnect the power supply cord and remove outer ca
29. If the sensor has not detected the vapor of the food ERROR will apear and the oven will shut off Water load cooking test Warning The oven should be fully assembled before following procedure Make sure the oven the oven has been plugged in at least two minutes before checking sensor cook operation the cabinet should be installed and screws tightened 1 The oven should be plugged in at least two minutes before sensor cooking 2 Fill approximately 200 milliliters 7 2 oz of tap water in 1000 milliliters measuring cup 3 Place the container on the center of tray in the oven cavity 4 Close the door 5 Touch the Timer Clock pad once the Power Level pad twice the Start pad once and the number 1 pad once Now the oven is in the sensor cooking condition and TEST SENSOR and COOK will appear in the display 6 The oven will operate for the first 16 seconds without generating microwave energy NOTE ERROR will appear if the door is opened or STOP CLEAR pad is touched during the first stage of sensor cooking 7 After approximately 16 seconds microwave energy is produced If ERROR is displayed replace the AH sensor or check the control unit refer to explaination below If the oven stops after 5 minutes and ERROR is displayed check the parts except for the AH sensor TESTING METHOD FOR AH SENSOR AND OR CONTROL UNIT To determine if the sensor is defective the simplest method is to replace it with a new replacement
30. MANUAL BERTAZZONI MICROWAVE OVEN PRODUCT DESCRIPTION MO30 STA NE FOREWORD GENERAL INFORMATION This Manual has been prepared to provide BERTAZZONI Service Personnel with Operation and Service Information for the BERTAZ ZONI MICROWAVE OVEN OPERATION It is recommended that service personnel carefully study the entire text of this manual so that they will be qualified to render satisfactory customer service TROUBLESHOOTING GUIDE AND TEST PROCEDURE Check the interlock switches and the door seal carefully Special attention should be given to avoid electrical shock and microwave radiation hazard COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE WARNING Never operate the oven until the following points are ensured A The door is tightly closed B The door brackets and hinges are not defective C The door packing is not damaged D The door is not deformed or warped E There is no other visible damage with the oven WIRING DIAGRAM Servicing and repair work must be carried out only by trained service PARTS LIST personnel DANGER Certain initial parts are intentionally not grounded and present a risk of electrical shock only during servicing Service personnel Do not contact the following parts while the ap pliance is energized High Voltage Capacitor Power Transformer Magnetron High Voltage Rectifier Assembly High Voltage Harness If provided Vent Hood Fan assembly Cooling Fan Motor All the parts
31. 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 In this service manual the touch control panel assembly is divided into two units Con trol Unit and Key Unit and also the Control Unit is divided into two units LSI Unit and Power Unit and troubleshooting by unit replacement is described according to the symptoms indicated Before testing 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 5 Ensure that these leads remain isolated from other components and oven chassis by using insulation tape After that procedure re connect the power supply cord 1 Key Unit NOTE 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 Check Key unit ribbon connection before replacement 5 Reconnect all leads removed from components during testing 6 7 8 9 Re install the outer case cabinet Reconnect the power supply cord after the outer case is installed Run the oven and check all functions 19 5 TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST The following symptoms indicate a defe
32. ctive key unit a When touching the pads a certain pad produces no signal at all b When touching a number pad two figures or more are displayed c When touching the pads sometimes a pad produces no signal If the Key unit is defective 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 Replace the Key unit 5 Reconnect all leads removed from components during testing 6 Re install the outer case cabinet 7 Reconnect the power supply cord after the outer case is installed 8 Run the oven and check all functions 2 Control Unit The following symptoms indicate a defective control unit Before replacing the control unit perform the Key unit test Procedure J to determine if control unit is faulty 2 1 In connection with pads a When touching the pads a certain group of pads do not produce a signal b When touching the pads no pads produce a signal 2 2 connection with indicators a At a certain digit all or some segments do not light up b Ata certain digit brightness is low c Only one indicator does not light d The corresponding segments of all digits do not light up or they continue to light up e Wrong figure appears f A certain group of indicators do not light up 9 The figure of all digits flicker h The following symptoms indicate a defective LSI unit When touching the keys on the touch screen a certain key produces
33. econnect the wire lead to the monitor switch COM terminal and check the continuity of the monitor circuit Reconnect all leads removed from components during testing 18 0 5 TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 6 Reinstall the outer case cabinet 7 Reconnect the power supply cord after the outer case is installed 8 Run the oven and check all functions Screw Driver Primary Interlock Switch H BLOWN MONITOR FUSE TEST Disconnect the power supply cord and then remove outer case Open the door and block it open Discharge high voltage capacitor If the monitor fuse is blown when the door is opened check the primary switch and monitor switch according to the TEST PROCEDURE for those switches before replacing the blown monitor fuse CAUTION BEFORE REPLACING A BLOWN MONITOR FUSE TEST THE PRIMARY SWITCH AND MONITOR SWITCH FOR PROPER OPERATION If the monitor fuse is blown by improper switch operation the monitor fuse and monitor switch must be replaced with monitor fuse and monitor switch assembly part number FFS BAO16 KIT even if the monitor switch operates normally The monitor fuse and monitor switch assembly is comprised of a 20 ampere fuse and switch Reconnect all leads removed from components during testing Reinstall the outer case cabinet Reconnect the power supply cord after the outer case is installed Run the oven and check all functions ONDA
34. fting up 4 Insert a putty knife thickness of about 0 5mm into the gap between the choke cover and door frame as shown in Figure C 4 to free engaging parts 5 Pry the choke cover by inserting a putty knife as shown Figure C 4 6 Release choke cover from door panel 7 Now choke cover is free Figure C 4 Door Disassembly 30 8 Release the door panel from twelve 12 tabs of door frame 9 Remove the door panel from the door frame 10 Now door panel is free 11 Slide latch head upward and remove it from door frame with releasing latch spring from door frame and latch head 12 Now latch head and latch spring are free 13 Remove door screen from door frame 14 Now door frame is free RE INSTALL 1 Re install door screen to door frame 2 Re install the latch spring to the latch head Re install the latch spring to the door frame Re install latch head to door frame 3 Re install door panel to door frame by fitting twelve 12 tabs of door frame to twelve 12 holes of door panel 4 Putsealer film on door panel Refer to Sealer Film about how to handle new one 5 Catch two 2 pins of door panel on two 2 hole of upper and lower oven hinges and door stopper 5 SEALER FILM Installation 1 Put the adhesive tape on the backing film of the sealer film as shown in Fig C 6 Tear the backing film by pulling the adhesive tape Put the pasted side of the sealer film on the door
35. gh voltage rectifier against the chassis with the use of an insulated screwdriver Whenever troubleshooting is performed the power supply must be disconnected It may in some cases be necessary to connect the power supply after the outer case has been removed in this event 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 5 Ensure that the leads remain isolated from other components and oven chassis by using insulation tape 6 After that procedure reconnect the power supply cord Don t Touch Danger High Voltage When the testing is completed 1 Disconnect the power supply cord and then remove outer case Open the door and block it open Discharge high voltage capacitor Reconnect the leads to the primary of the power transformer 5 Reinstall the outer case cabinet 6 Reconnect the power supply cord after the outer case is installed 7 Run the oven and check all functions After repairing 1 Reconnect all leads removed from components during testing 2 Reinstall the outer case cabinet 3 Reconnect the power supply cord after the outer case is installed 4 Run the oven and check all functions Microwave ovens should not be run empty To test for the presence of microwave energy within a cavity place a cup of cold water on t
36. given off from the heating foods It is then exhausted through the exhausting air vents at the oven cavity MONITOR FUSE 1 The monitor fuse blows when the contacts COM NO of the primary switch remain closed with the oven door open and when the monitor switch closes 2 If the wire harness or electrical components short circuited this monitor fuse blows to prevent an electric shock or fire hazard CAVITY TEMPERATURE FUSE The cavity temperature fuse located on the top of the oven cavity is designed to prevent damage to the oven by fire If the food load is overcooked by either error in cook time or defect in the control unit the cavity temperature fuse will open Under normal operation the cavity temperature fuse remains closed However when abnormally high temperatures are reached within the oven cavity the cavity temperature fuse will open at 302 F 150 C causing the oven to shut down NOTE This is fuse It does not reset MAGNETRON TEMPERATURE FUSE The magnetron temperature fuse located near the magne tron is designed to prevent damage to the magnetron if an over heated condition develops in the tube due to cooling fan failure obstructed air guide dirty or blocked air intake etc Under normal operation the magnetron temperature fuse remains closed However when abnormally high tempera tures are reached within the magnetron the magnetron temperature fuse will open at 302 F 150 C causing the oven to s
37. he following is a description of component functions dur ing oven operation OFF CONDITION Closing the door activates the door sensing switch and secondary interlock switch In this condition the monitor switch contacts are opened When oven is plugged in 120 volts A C is supplied to the control unit Figure 1 1 The display will show flashing WELCOME PRESS CLEAR and PRESS CLOCK To set any program or set the clock you must first touch the STOP CLEAR pad The display will clear and will appear COOKING CONDITION Program desired cooking time by touching the NUMBER pads Program the power level by touching the POWER LEVEL pad and then a Number pad When the START pad is touched the following operations 1 contacts of relays are closed and components connected to the relays are turned on as follows For details refer to Figure O 2 RELAY CONNECTED COMPONENTS RY 1 oven lamp turntable motor fan motor RY 2 power transformer 2 120 volts A C is supplied to the primary winding of the power transformer and is converted to about 3 3 volts A C output on the filament winding and approximately 2370 volts A C on the high voltage winding 3 The filament winding voltage heats the magnetron filament and the winding voltage is sent to a voltage doubler circuit The microwave energy produced by the magnetron is channelled through the waveguide into the cavity feed box and the
38. he oven turntable close the door and set the power to HIGH and set the microwave timer for two 2 minutes When the two minutes has elapsed timer at zero carefully check that the water is now hot If the water remains cold carry out Before Servicing procedure and re examine the connections to the component being tested When all service work is completed and the oven is fully assembled the microwave power output should be checked and a microwave leakage test should be carried out 5 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 A Requirements Every microwave oven shall function in such a manner that when the oven is fully assembled and operating with its service controls and user controls adjusted to yield the maximum output the leakage radiation at all points at least 5 cm from the external surface of the oven does not exceed 1 1 0mW cm with the test load of 275 15 ml of water at an initial temperature 20 5 C 2 5 0mW cm when the outer enclosure is removed with a test load of 275 15 ml of water at an initial temperature 20 5 C 3 5 0mW cm without a test load B Preparation for testing Before beginning the actual meas
39. here the continuity of the metal has been breached eg around the switches indicator and vents While testing for leakage around the door pull the door away from the front of the oven as far as is permitted by the closed latch assembly 4 Measure carefully at the point of highest leakage and make sure that the highest leakage is no greater than 4mW cm and that the secondary interlock switch does turn the oven OFF before any door movement C Leakage test without enclosure 1 Remove the enclosure cabinet 2 Grasp the probe of the survey instrument and hold it perpendicular to all mechanical and electric parts of the oven that is accessible to the user of the oven including but not limited to the waveguide cavity seams magnetron gap between the door and the body of the oven 3 Move the probe slowly not faster than 2 5 cm sec along the gap watching for the maximum indication on the meter 4 Measure carefully at the point of highest leakage and make sure that the highest leakage is under 5mW cm CAUTION Special attention should be given to avoid electrical shock because HIGH VOLTAGE is generated during this test No Load test 1 Operate the oven without a load and measure the leakage by the same method as the above test procedure Leakage test with enclosure installed 2 Make sure that the highest leakage should not exceed 5mW cm NOTE After servicing record data on service invoice and microwave leakage report 5
40. holding switch in place 8 Switch is now free At this time switch lever will be free do not lose it Re install 1 Re install each switch in its place The secondary interlock monitor switches are in the lower position and the door sensing switch is in the upper position 2 Re connect wire leads to each switch Refer to pictorial diagram 5 3 Secure latch hook with two 2 mounting screws to oven flange 4 Make sure that the monitor switch is operating properly DOOR SENSING SWITCH PRIMARY SWITCH SECONDARY SWITCH AND MONITOR SWITCH ADJUSTMENT 1 Disconnect the power supply cord and then remove outer case 2 Open the door and block it open 3 Discharge high voltage capacitor If the door sensing switch primary switch secondary switch and monitor switch do not operate properly due to a misad justment the following adjustment should be made 4 Loosen the two 2 screws holding latch hook to the oven cavity front flange 5 With door closed adjust latch hook by moving it back and forth and up and down In and out play of the door allowed by the upper and lower position of the latch hook should be less than 0 5mm The vertical position of the latch hook should be adjusted so that the door sensing switch primary switch and secondary switch are activated with the door closed The horizontal position of the latch hook should be adjusted so that the plunger of the monitor switch is pressed with
41. hut down NOTE This is fuse It does not reset 5 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 These tests are given a procedure letter which will be found in the Test Procedure section IMPORTANT If the oven becomes inoperative because of a blown monitor fuse check the primary switch and monitor switch before replacing the monitor fuse If the monitor fuse is replaced the monitor switch must also be replaced Use part FFS BA016 KIT as an assembly IMPORTANT Whenever troubleshooting is performed with the power supply cord disconnected It may in some cases be necessary to connect the power supply cord after the outer case has been removed in this event Disconnect the power supply cord and then remove outer case Open the door and block it open Discharge high voltage capacitor Disconnect the leads to the primary of the power transformer Ensure that the leads remain isolated from other components and oven chassis by using insulation tape 6 After that procedure reconnect the power supply cord When the testing is completed Disconnect the power supply cord and then remove outer case
42. ion is indicated the control unit is probably defective and should be checked 21 5 PROCEDURE TEST PROCEDURES COMPONENT TEST LETTER 311111 1 44 44 SENSOR TEST Checking the initial sensor cooking condition Warning The oven should be fully assembled before following procedure 1 The oven should be plugged in at least two minutes before sensor cooking 2 Room temperature should not exceed 95 F 35 C 3 The unit should not be installed in any area where heat and steam are generated The unit should not be installed for example next to conventional surface unit Refer to the INSTALLATION INSTRUCTIONS of the operational manual 4 Exhaust vents are provided on the back of the unit for proper cooling and air flow in the cavity To permit adequate ventilation be sure to install so as not to block these vents There should be some space for air circulation b Be sure the exterior of the cooking container and the interior of the oven are dry Wipe off any moisture with dry cloth or paper towel 6 The Sensor works with food at normal storage temperature For example chicken pieces would be at refrigerator temperature and canned soup at room temperature 7 Avoid using aerosol sprays or cleaning solvents near the oven while using Sensor settings The sensor will detect the vapor given of by the spray and turn off before food is properly cooked 8
43. k for restricted air flow through the vent holes of the oven cavity especially the cooling fan and air guide Reconnect all leads removed from components during testing Reinstall the outer case cabinet Reconnect the power supply cord after the outer case is installed Run the oven and check all functions MAGNETRON TEMPERATURE FUSE TEST Disconnect the power supply cord and then remove outer case Open the door and block it open Discharge high voltage capacitor A continuity check across the magnetron temperature fuse terminals should indicate a closed circuit unless the temperature of the magnetron temperature fuse reaches approximately 302 F 150 C An open magnetron temperature fuse indicates overheating of the magnetron Check for restricted air flow to the magnetron especially the cooling fan air guide Reconnect all leads removed from components during testing Reinstall the outer case cabinet Reconnect the power supply cord after the outer case is installed ONDA Ne NOD 17 5 PROCEDURE LETTER 8 TEST PROCEDURES COMPONENT TEST Run the oven and check all functions CAUTION IF THE TEMPERATURE FUSE INDICATES AN OPEN CIRCUIT AT ROOMTEMPERATURE PRIMARY AND SECONDARY SWITCH TEST 5 Disconnect the power supply cord and then remove outer case Open the door and block it open Discharge high voltage capacitor Isolate
44. l 5 6 7 Then connect the dummy resistor circuit See fig to the sensor connector of control panel Disconnect the leads to the primary of power transformer Ensure that these leads remain isolated from other components and oven chassis by using insula ion tape After that procedure re connect the power supply cord Check the sensor cook operation proceed as follows 9 1 Touch Timer Clock pad once the Power Level pad twice the Start pad once and the number 1 pad once 9 2 The control panel is in the sensor cooking operation 9 3 After approximately 25 seconds push plunger of select switch for more than 3 seconds This condition is same as judgement by AH sensor 9 4 After approximately 3 seconds the display shows xx xx which is remaining cooking time and the display count down If the above is not the case the control unit is probably defective If the above is proper the AH sensor is probably defective Disconnect the power supply cord and then remove outer case JOpen the door and block it open Discharge high voltage capacitor Reconnect the sensor connector that is mounted to control panel JCarry out the necessary repair Reconnect all leads removed from components during testing and repairing Re install the outer case cabinet Reconnect the power supply cord after the outer case is installed Run the oven and check all functions 18 Carry out the water load cooking test again and ensure that the oven work
45. marked on parts list are used at voltages more than 250V Removal of the outer wrap gives access to voltage above 250V All the parts marked A on parts list may cause undue microwave exposure by themselves or when they are damaged loosened or removed 1503 South Coast Drive Suite 320 Costa Mesa CA 92626 0 5 SPECIFICATION ITEM DESCRIPTION Power Requirements 120 Volts 13 0 Amperes 1500Watts 60 Hertz Single phase 3 wire grounded Power Output 1100 watts IEC 705 TEST PROCEDURE Operating frequency of 2450MHz Case Dimensions Width 24 Height 13 3 8 Depth 19 1 4 Cooking Cavity Dimensions Width 17 3 8 2 0 Cubic Feet Height 10 1 2 Depth 18 5 8 Tray Size 15 Control Complement Touch Control System Clock 1 00 12 59 Timer 0 99 min 99 seconds Microwave Power for Variable Cooking Repetition Rate Full power throughout the cooking time 90 of Full Power 8096 of Full Power 7096 of Full Power 6096 of Full Power 50 of Full Power 4096 of Full Power 3096 of Full Power 2096 of Full Power 1096 of Full Power Sensor Cooking Pads Popcorn Reheat Help Fresh Vegetables Rice Baked Potatoes Ground Meat Poultry Fish Seafood Frozen Foods Entrees Snacks Vegetables Menu Options Breakfast Lunch 15 Minute Recipes Defrost From the Pantry Beverages Standard Options Number pads Timer Clock Keep Warm Add a Minute Power Level Stop Clear
46. n into the cavity where the food is placed to be cooked 5 Upon completion of the cooking time the power transformer oven lamp etc are turned off and the generation of microwave energy is stopped The oven will revert to the OFF condition 6 Whenthe dooris opened during a cook cycle the monitor switch secondary switch door sensing switch primary switch and secondary interlock relay are activated with the following results The circuits to the turntable motor the cooling fan motor and the high voltage components are de energized the oven lamp remains on and the digital read out displays the time still remaining in the cook cycle when the door was opened 7 The monitor switch electrically monitors the operation of the primary switch and primary and is mechanically associated with the door so that it will function in the following sequence 1 When the door opens from the closed position the primary switch secondary switch door sensing switch and secondary interlock relay open their contacts and the monitor switch contacts close 2 When the door is closed from the open position the monitor switch contacts open first Then the contacts of the primary switch and door secondary switch close If the primary switch and the secondary switch primary contacts are closed when the door is opened the monitor switch contacts form a short circuitthrough the monitor fuse primary switch and secondary switch causing the monitor fuse
47. nd cook relay are de energized and the power transformer oven lamp etc are turned off 6 Openingthe door ortouching the STOP CLEAR pad the time of day will reappear on the display and the oven will revert to an OFF condition 5 NOTE CONDITION OF OVEN 1 DOOR CLOSED 2 CLOCK APPEARS ON DISPLAY SCHEMATIC NOTE 1 2 CIRCUITS SUBJECT TO CHANGE WITHOUT NOTICE WIRE COLOR CODES ARE APPLICABLE TO PRIMARY CIRCUIT ONLY AND NOT APPLICABLE TO LOW VOLTAGE CIRCUIT AND SECONDARY CIRCUIT HOT WIRE S MUST BE CONNECTED TO THE TERMINAL WITH BLUE MARK ON THE LAMP SOCKET AND H MARK ON THE POWER SUPPLY CORD SECONDARY PRIMARY SWITCH SWITCH 5 2 NEST a z 5 E 55 2 Mio SENSING 2 s 5 5 5 5 SPP 0 0 gt gt 5 55 d Al 4 4 4 B1 5 e L 55 H oS Ae 35 3 2 z 2 gt p POWER EN 5 gt 23 ES ara TRANSFORMER 1 it pa E RY 1 455222 j NC 5 E SECONDARY pun E 8 INTERLOCK
48. nfinite resistance If there is little or no resistance the magnetron is grounded and must be replaced Reconnect all leads removed from components during testing Reinstall the outer case cabinet Reconnect the power supply cord after the outer case is installed Run the oven and check all functions MICROWAVE OUTPUT POWER The following test procedure should be carried out with the microwave oven in a fully assembled condi tion outer case fitted HIGH VOLTAGES ARE PRESENT DURING THE COOK CYCLE SO EXTREME CAUTION SHOULD BE OBSERVED Power output of the magnetron can be measured by performing a water temperature rise test This test should only be used if above tests do not indicate a faulty magnetron and there is no defect in the following components or wiring silicon rectifier high voltage capacitor and power transformer This test will require a 16 ounce 453cc measuring cup and an accurate mercury thermometer or thermocouple type temperature tester For accurate results the following procedure must be followed carefully ON 1 Fill the measuring cup with 16 453 of tap water and measure the temperature of the water with a thermometer or thermocouple temperature tester Stir the thermometer or thermocouple through the water until the temperature stabilizes Record the temperature of the water 2 Place the cup of water in the oven Operate oven at POWER 10 HIGH selecting more than 60 seconds cook time
49. no signal at all When touching a number key on the touch screen two figures or more are displayed When touching the keys on the touch screen sometimes a key produces no signal 2 3 Other possible problems caused by defective control unit a Buzzer does not sound or continues to sound b Clock does not operate properly Cooking is not possible When testing is completed 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 Reconnect all leads removed from components during testing 5 Re install the outer case cabinet 6 Reconnect the power supply cord after the outer case is installed 7 Run the oven and check all functions J KEY UNIT 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 display fails to clear when the STOP CLEAR pad is depressed first verify the flat ribbon cable is making good contact verify that the door sensing switch stop switch operates properly that is the contacts are closed when the door is closed and open when the door is open If the door sensing switch stop switch is good disconnect the flat ribbon cable that connects the key unit to the control unit and make sure the door sensing switch is closed either close the door or short the door sensing switch connecter Use the Key unit matrix indicated on the con
50. of supplementary cooking is determined by ex periment with each food category and inputted into the LSI An example of how sensor works BAKED POTATOES 1 Potatoes at room temperature Vapor is emitted very slowly 2 Heat Potatoes Moisture and humidity is emitted rapidly You can smell the aroma as it cooks 3 Sensor detects moisture and humidity and calculates cooking time and variable power AH SENSOR 0 STA NE Cooking Sequence 1 Touch one of the SENSOR pads and then touch the Start pad NOTE The oven should not be operated on SENSOR immediately after plugging in the unit Wait two minutes before cooking on SENSOR 2 Thecoilofshut off relay RY 1 is energized the turntable motor oven lamp and cooling fan motor are turned on but the power transformer is not turned on 3 Afterabout 16 seconds the cook relay RY 2 is energized The power transformer is turned on microwave energy is produced and first stage is started The 16 seconds is the cooling time required to remove any vapor from the oven cavity and sensor NOTE During this first stage do not open the door or touch STOP CLEAR pad 4 Whenthe sensor detects the vapor emitted from the food the display switches over to the remaining cooking time and the timer counts down to zero At this time the door may be opened to stir turn or season food 5 When the timer reaches zero an audible signal sounds The shut off relay a
51. ot operate Oven does not go into cook cycle when START pad is touched Oven seems to be operating but little or no heat is produced in oven load Food incompletely cooked or not cooked at all at end of cook cycle Oven goes into a cook cycle but extremely uneven heating is produced in oven load food Oven does not cook properly when programmed for P 50 50 PERCENT mode Operates properly on 100 PERCENT mode Oven goes into Defrost but food is not defrosted well AH sensor does not end during Sensor sensor Cooking condition Oven does not shut COOKING off after a cup of water is boiling by CONDITION sensor cooking Oven stops at 16 sec or error displays after starting COOKING CONDITION TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER A 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 15 5 PROCEDURE LETTER TEST PROCEDURES COMPONENT TEST 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 5 To test fora shorted magnetron connect the ohmmeter leads between the magnetron filament leads and chassis ground This test should indicate an i
52. panel 6 Re install choke cover to door panel by pushing Note After any service to the door A Make sure that door sensing switch and secondary interlock switch are operating properly Refer to 2 chapter Test Procedures 3 B An approved microwave survey meter should be used to assure compliance with proper microwave radiation emission limitation standards Sealer film After any service make sure of the following Backing film 1 Door latch heads smoothly catch latch hook through latch holes and that latch head goes through center of latch hole Lx 2 Deviation of door alignment from horizontal line of cavity Adhesive tape face plate is to be less than 1 0mm 3 Door is positioned with its face pressed toward cavity face plate 4 Check for microwave leakage around door with an approved microwave survey meter Referto Microwave Measurement Procedure Note The door on a microwave oven is designed to act as an electronic seal preventing the leakage of microwave energy from oven cavity during cook cycle This function does not require that door be air tight moisture condensation tight or light tight Therefore occasional appearance of moisture light or sensing of gentle warm air movement around oven door is not abnormal and do not of themselves indicate a leakage of microwave energy from oven cavity Upper Oven Choke Cover Figure C 5 Door Replacement 31 5
53. rape over a countertop or table where it can be pulled on by children or tripped over accidentally CAUTION DO NOT UNDER ANY CIRCUMSTANCES CUT OR REMOVE THE ROUND GROUNDING PRONG FROM One touch door open button Push to open door Door latches The oven will not operate unless the door is securely closed Removable turntable support Removable turntable The turntable will rotate clockwise or counterclockwise Oven lamp It will light when oven is operating or door is opened Oven door with see through window Ventilation openings Rear Auto Touch control panel Timedisplay Digital display 99 minutes 99 seconds NOTE OVEN DIAGRAM 8 10 Turn table motor shaft 11 Wave guide cover 12 Power supply cord TOUCH CONTROL PANEL The directed features are disabled after one minute 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 SENSOR COOKING POPCORN REHEAT HELP FRESH VEGETABLES RICE POTATOES GROUND FISH MEAT POULTRY SEAFOOD FROZEN FOODS ENTREES SNACKS VEGETABLES MENU OPTIONS 15 MINUTE BREAKFAST LUNCH RECIPES FROM THE DEFROST PANTRY BEVERAGES 3 8 TIMER ADDA CLOCK w MINUTE POWER LEVEL START 5 OPERATION DESCRIPTION OF OPERATING SEQUENCE T
54. s than 1 ohm and the resistance of the high voltage coil should be approximately 90 ohms the resistance of the filament coil should be less than 1 ohm Reconnect all leads removed from components during testing Reinstall the outer case cabinet Reconnect the power supply cord after the outer case is installed Run the oven and check all functions HIGH VOLTAGES ARE PRESENT AT THE HIGH VOLTAGE TERMINAL SO DO NOT ATTEMPT TO MEASURE THE FILAMENT AND HIGH VOLTAGE 16 0 5 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 If a short is indicated in both directions or if an infinite resistance is read in both directions the rectifier is probably defective and should be replaced Reconnect all leads removed from components during testing Reinstall the outer case cabinet Reconnect the power supply cord after the outer case is installed Run the oven and check all functions NOTE Be sure to use an ohmmeter that will supply a forward bias voltage of more than 6 3 volts D HIGH VOLTAGE CAPACITOR T
55. se Open the door and block it open Discharge high voltage capacitor Remove the wire leads from the oven lamp the terminal by pushing on the positive lock lever Fig C 1 Remove the screw holding the oven lamp then remove lamp from the magnetron duct Now the oven lamp is free to check or replace POSITIVE LOCK CONNECTOR NO CASE TYPE REMOVAL Disconnect the power supply cord and then remove outer case Open the door and block it open Discharge high voltage capacitor Push the lever of positive lock connector Pull down on the positive lock connector CAUTION WHEN CONNECTING THE POSITIVE LOCK 7 CONNECTORS THE TERMINALS CON NECT THE POSITIVE LOCK SO THAT THE LEVER FACES YOU Terminals Screw Oven lamp Figure C 1 Oven lamp Terminal Positive lock connector Lever Figure C 2 Positive lock connector CONTROL PANEL ASSEMBLY REMOVAL Disconnectthe power supply cord and then remove outer case Figure 3 PWB Removal TURNTABLE MOTOR REMOVAL Open the door and block it open Discharge high voltage capacitor Disconnect the wire leads from panel components Remove the one 1 screw holding the control panel assembly to the oven cavity front plate Slide the control panel assembly upward and remove it Now individual components can be removed WB Remo
56. solute humidity g m2 3 Detector circuit of Absolute Humidity Sensor circuit This detector circuit is used to detect the output voltage of the absolute humidity circuit to allow the LSI to control sensor cooking of the unit When the unit is set in the sensor cooking mode 16 seconds clearing cycle occurs then the detector circuit starts to function and the LSI observes the initial voltage available at its AN1 terminal With this voltage given the switches SW1 to SW5 in the LSI are turned on in such a way as to change the resistance values in parallel with R48 R52 of Changing the resistance value results in that there is the same potential at both F 3 terminal of the absolute humidity sensor and AN6terminal ofthe LSI The voltage of ANS5 terminal will indicat about 16 seconds about 2 50 V This initial balancing is set up about 16 seconds after the unit is put in the Sensor Cooking mode As the sensor cooking proceeds the food is heated to generate moisture by which the resistance balance of the bridge circuit is deviated to increase the voltage available at AN5 terminal of the LSI Then the LSI observes that the voltage at AN5 terminal and compares it with its initial value and when the comparison rate reaches the preset value fixed for each menu to be cooked the LSI causes the unit to stop sensor cooking thereafter the unit goes in the next operation automatically When the LSI starts to detect the initial voltage
57. supply cord and then remove outer Open the door and block it open Discharge high voltage capacitor Disconnect two 2 wire leads from the male tab terminals of the Secondary Interlock Relay Check the state of the relay contacts using a ohmmeter The relay contacts should be open If the relay contacts are closed replace the circuit board entirely or the relay itself Reconnect all leads removed from components during testing Reinstall the outer case cabinet Reconnect the power supply cord after the outer case is installed Run the oven and check all functions MONITOR SWITCH TEST 1 Disconnect the power supply cord and then remove outer case 2 Open the door and block it open 3 4 Before performing this test make sure that the primary switch is operating properly according to Discharge high voltage capacitor the above Switch Test Procedure Disconnect the wire lead from the monitor switch COM terminal Check the monitor switch operation by using the ohmmeter as follows When the door is open the meter should indicate a closed circuit When the monitor switch actuator is pushed by a screw driver through the lower latch hole on the front plate of the oven cavity with the door opened in this condition the plunger of the monitor switch is pushed in the meter should indicate an open circuit If improper operation is indicated the switch may be defective After testing the monitor switch r
58. tage capacitor Disconnect wire leads primary and high voltage from power transformer and the filament leads from the magnetron and capacitor terminals Remove four 4 screws holding transformer to bottom plate Remove transformer from bottom plate N terminals toward the oven face plate Secure transformer with four screws to bottom plate Re connect wire leads primary and high voltage to power transformer and filament leads of transformer to magnetron and high voltage capacitor Refer to PICTORIAL DIAGRAM on page 33 4 Re install outer case and check that oven is operating properly HIGH VOLTAGE RECTIFIER AND HIGH VOLTAGE CAPACITOR REMOVAL Disconnect the power supply cord and then remove outer case Open the door and block it open Discharge high voltage capacitor Disconnect the high voltage wire A from the high voltage capacitor Disconnect the high voltage wire of high voltage rectifier assembly from the magnetron Disconnect the filament lead short one of the power transformer from the high voltage capacitor 7 8 9 Remove one 1 screw holding capacitor holder with the high voltage rectifier to the base plate Disconnect rectifier terminal from capacitor High voltage rectifier assembly is now free Remove capacitor holder Capacitor is now free CAUTION WHEN REPLACING HIGH VOLTAGE REC TIFIER AND HIGH VOLTAGE CAPACITOR GROUND SIDE TERMINAL OF T
59. the switch and connect the ohmmeter to the common COM and normally open NO terminal of the switch The meter should indicate an open circuit with the door open and a closed circuit with the door closed If improper operation is indicated replace the secondary interlock switch Reconnect all leads removed from components during testing Reinstall the outer case cabinet Reconnect the power supply cord after the outer case is installed Run the oven and check all functions ECONDARY INTERLOCK SYSTEM TEST DOOR SENSING SWITCH RON Disconnect the power supply and then remove outer case Open the door and block it open Discharge high voltage capacitor Isolate the switch and connect the ohmmeter to the common COM and normally open NO terminal of the switch The meter should indicate an open circuit with the door open and a closed circuit with the door closed If improper operation is indicated replace the door sensing switch Reconnect all leads removed from components during testing Reinstall the outer case cabinet Reconnect the power supply cord after the outer case is installed Run the oven and check all functions NOTE If the door sensing switch contacts fail in the open position and the door is closed the cooling fan turntable and oven light will be activated by RY1 SECONDARY INTERLOCK RELAY RY2 AUN Disconnect the power
60. to blow POWER LEVEL 0 TO 100 COOKING When Variable Cooking Power is programmed the 120 volts A C is supplied to the power transformer intermittently through the contacts of relay RY 2 which is operated by the control unit within a 32 second time base Microwave power operation is as follows VARI MODE ON TIME OFF TIME 100 power 32 sec 0 sec approx 90 power 30 sec 2 sec approx 80 power 26 sec 6 sec approx 70 power 24 sec 8 sec approx 60 power 22 sec 10 sec approx 50 power 18 sec 14 sec approx 40 power 16 sec 16 sec ___ 30 power 12sec 205 approx 20 power 8 sec 24 sec approx 10 power 6 sec 26 sec 096 power 0 sec 32 sec Note TheON OFF time ratio does notcorrespond with the percentage of microwave power because approx 2 seconds are needed for heating of the magnetron filament SENSOR COOKING CONDITION Using the SENSOR function the food is cooked without figuring time power level or quantity When the oven senses enough steam from the food it relays the information to its microprocessor which will calculate the remaining cooking time and power level needed for best results When the food is cooked water vapor is developed The sensor senses the vapor and its resistance increases gradually When the resistance reaches the value set according to the menu supplementary cooking is started The time
61. trol panel schematic and place a jumper wire between the pins that correspond to the STOP CLEAR pad making momentary contact If the control unit responds by clearing with a beep the key unit is faulty and must be replaced If the control unit does not respond it is faulty and must be replaced If a specific pad does not respond the above method may be used after clearing the control unit to determine if the control unit or key pad is at fault 5 Reconnect all leads removed from components during testing 20 5 TEST PROCEDURES PROCEDURE COMPONENT TEST 6 Re install the outer case cabinet 7 Reconnect the power supply cord after the outer case is installed 8 Run the oven and check all functions G1 G2 3 G4 7 7 27 2 KEY UNIT K 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 5 Ensure that these leads remain isolated from other components and oven chassis by using insulation tape After that procedure re connect the power supply cord Remove the outer case and check voltage between Pin No 1 of the 2 pin connector A and the common terminal of the relay RY1 on the control
62. urement of leakage proceed as follows 1 Make sure that the actual instrument is operating normally as specified in its instruction booklet Important Survey instruments that comply with the requirement for instrumentation as prescribed by CSA and NHW performance stand ard for microwave ovens must be used for testing recommended instruments are NARDA 8100 and NARDA 8200 2 Place the oven tray in the oven cavity 3 Place the load of 275315 ml of tap water initially at 20 5 C in the center of the oven cavity The water container shall be a low form of 600 ml beaker with an inside diameter of approx 8 5 cm 3 1 2 in and made of an electrically nonconductive material such as glass or plastic The placing of this standard load in the oven is important not only to protect the oven but also to insure that any leakage is measured accurately Set the cooking control on Full Power Cooking Mode Close the door and select a cook cycle of several minutes If the water begins to boil before the survey is completed replace it with 275 ml of cool water 4 C Leakage test with enclosure installed 1 lt Grasp the probe of the survey instrument and hold it perpendicular to the gap between the door and the body of the oven 2 Move the probe slowly not faster than 2 5 cm sec along the gap watching for the maximum indication on the meter 3 Check for leakage at the door screen sheet metal seams and other accessible positions w
63. val Lay Control Panel on pretect surface with PWB up Remove 4 scews shown in Fig 3 Lift plastic ribbon holder to release ribbon out of connector Release tabs from PSU 4 and LSI 2 and lift each off The PWB is now free to replace Disconnect the power supply cord Remove turntable and turntable support from oven cavity Laythe oven onit s backside Remove the turntable motor cover by snipping off the material in four corners Where the corners have been snipped off bend corner areas flat No sharp edges must be evident after removal of the turntable motor cover Disconnect wire leads from turntable motor 28 See Positive lock connector removal Remove one 1 screw holding turntable motor to oven cavity Now the turntable motor is free Afterreplacementuse the one 1 screw tofitthe turntable motor cover i 5 COOLING MOTOR REMOVAL REMOVAL 1 Disconnectthe power supply cord and then remove outer case Open the door and block it open Discharge high voltage capacitor Disconnect the wire leads from the fan motor WP oven cavity back plate Remove the fan blade from the fan motor shaft according to the following procedure 7 Hold the edge of the rotor of the fan motor by using pair of groove joint pliers CAUTION Make sure that no metal pieces enter the gap between the rotor and the stator of

MO30 STA NE Installation, Use & Care Manual 2015

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MO30 STA NE Installation, Use &amp; Care Manual 2015

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MO30 STA NE Installation, Use & Care Manual 2015