Service Base Manual Covers General Infomation.

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ServiceBase manual covers general infomation.Refer to individual Technical Sheet forinformation on specific models.Jetclean II DishwashersThis manual includes, but is not limited tothe MDBL540AWMDBL740AWThis manual is to be used by qualified appliancetechnicians only. Maytag does not assume anyresponsibility for property damage or personalinjury for improper service procedures done byan unqualified person.16021814Revison 0August 2002

Important InformationPride and workmanship go into every product to provide our customers with quality products. It is possible, however,that during its lifetime a product may require service. Products should be serviced only by a qualified servicetechnician who is familiar with the safety procedures required in the repair and who is equipped with the proper tools,parts, testing instruments and the appropriate service manual. REVIEW ALL SERVICE INFORMATION IN THEAPPROPRIATE SERVICE MANUAL BEFORE BEGINNING REPAIRS.Important Notices for Consumers and Servicers! WARNINGTo avoid risk of serious injury or death, repairs should not be attempted by unauthorized persons, dangerousconditions (such as exposure to electrical shock) may result.! CAUTIONMaytag will not be responsible for any injury or property damage from improper service procedures. If performingservice on your own product, assume responsibility for any personal injury or property damage which may result.To locate an authorized servicer, please consult your telephone book or the dealer from whom you purchased thisproduct. For further assistance please contact:Customer Service Support CenterCAIR CenterWeb SiteTelephone NumberWWW.AMANA.COM . 1-800-843-0304WWW.JENNAIR.COM . 1-800-536-6247WWW.MAYTAG.COM . 1-800-688-9900CAIR Center in Canada . 1-800-688-2002Amana Canada Product . 1-866-587-2002Recognize Safety Symbols, Words, and Labels!DANGERDANGER—Immediate hazards which WILL result in severe personal injury or death.! WARNINGWARNING—Hazards or unsafe practices which COULD result in severe personal injury or death.! CAUTIONCAUTION—Hazards or unsafe practices which COULD result in minor personal injury or product or propertydamage.216021814 Rev. 0 2002 Maytag Appliance Sales Company

Table of ContentsImportant InformationImportant Notices for Consumers and Servicers . 2Recognize Safety Symbols, Words, and Labels . 2Section 1. Important Safety InformationGeneral Information .1-4Related Publications .1-4General Precautions and Warnings .1-4Product Warning LabelsJunction Box Warning .1-5Support Panel Warning .1-5Control Cover Warning .1-6Section 2. Electrical Equipment & TestingElectrical Test Equipment .2-7Appliance Test Meter .2-7Continuity Testing .2-7Digital Test Meter .2-7Voltage Checks .2-8Motor Test Cord .2-8Grounding Polarity .2-8Electrical TestsWater Valve .2-9Detergent / Rinse Aid Disp Wax Mtr Check .2-9Vent Wax Motor Check . 2-10Section 3. Cycles & OptionsCycles . 3-11Options . 3-12Display . 3-13Control Style by Model . 3-14Control Style by Model . 3-15Section 4. Trouble ShootingWill Not Fill . 4-16Overflows . 4-16Poor Water Circulation . 4-16Poor Washability . 4-17Will Not Drain . 4-17Continues to Drain . 4-17Poor Drying . 4-17Water Leaks . 4-18Noise . 4-18 2002 Maytag Appliance Sales CompanyWill Not Start or Program . 4-18Will Not Fill . 4-18Will Not Wash . 4-19Will Not Drain . 4-19Will Not Dry . 4-19Manual Function Test . 4-19Field Service Test . 4-19Section 5. Service and Disassembly ProceduresFront Support and Toe Panel Removal . 5-20Inner Door Panel Removal . 5-21Detergent / Rinse Aid Disp . 5-21Wax Motor Detergent / Rinse Aid Disp . 5-22Vent . 5-22Wire Cover . 5-22Door Latch & Switch Holder Assembly . 5-23PC Board . 5-24Technical Sheet . 5-24Control Panel . 5-24Door Latch Strike . 5-24Door Gasket . 5-25Outer Door . 5-25Door Hinge And Support . 5-26Door Spring . 5-26Door Spring And Component Replacement . 5-27Over Pressure Filter . 5-27Top Wash Arm . 5-27Manifold . 5-28Docking Station . 5-28Lower Wash Arm . 5-28Float . 5-29Heating Element . 5-30Thermostats . 5-31Water Valve . 5-31Air Water Inlet . 5-32Upper Rack Removal . 5-33Tub Wheels . 5-33Turbidity Sensor. 5-33Drain Pump . 5-34Wash Motor Assembly . 5-34Appendix AInstallation Instructions . A-2Appendix BJenn-Air User’s Guide . B-2Appendix CMDB-3 User’s Guide . B-2Appendix DMDB-4 User’s Guide . D-216021814 Rev. 03

Important Safety Information! WARNING! WARNINGTo avoid personal injury or death from improperservicing, make sure you read and understand thedescriptions and meaning of various safety symbols,words and labels used in this manual, beforeattempting any procedures described in the manual.Failure to understand and comply with safetyinformation may result in severe personal injury ordeath.General InformationThis Service Manual describes the operation,disassembly, troubleshooting, and repair of Maytag Dishwashers. It is intended for use by authorizedservicer’s who troubleshoot and repair these units.NOTE: It is assumed that users of this manual arefamiliar with the use of tools and equipment usedto troubleshoot and repair electrical, andmechanical systems; and understand theterminology used to describe and discuss them.Related PublicationsThis is a base service manual, covering a range ofsimilar models. It is intended to be used in conjunctionwith the Parts Manual and Technical Sheet coveringspecific model being serviced.General Precautions and Warnings Dispose of discarded appliance and shipping orpacking material properly. Do not allow children to play in or on dishwasher. Do not abuse, sit, stand or play on door or racks of adishwasher. Use only detergents and rinse agents recommended foruse in a dishwasher. Store dishwasher detergent and rinse agents out of thereach of children. If the dishwasher drains into a food disposer, makesure disposer is completely empty before runningdishwasher. Repairs should be done by a qualified technician. Do not tamper with controls. Do not touch the heating element during or immediatelyafter use. Load sharp knives with the handles up to reduce therisk of cut-type injuries or damaging seal.1-4To avoid risk of personal injury or death due toelectrical shock: Grounding wires and wires colored like groundingwires are NOT to be used as current carryingconductors. Standard accepted color coding for ground wiresis green or green with a yellow stripe. Grounding wires should not be removed fromindividual components while servicing, unlesscomponent is to be removed and replaced. Replace all removed grounding wires beforecompleting service.! WARNINGTo avoid death, severe personal injury, fire orelectrical shock when using dishwasher observethe following: Observe all local codes and ordinances. Disconnect electrical power to dishwasher beforeservicing. Connect dishwasher to a grounded metal,permanent wiring system. DO NOT ground to gas line. DO NOT ground to cold water pipe if pipe isinterrupted by plastic, non-metallic gaskets, orother insulating (non-conducting) materials. Check with a qualified electrician if you are notsure this appliance is properly grounded. This dishwasher is designed to operate onregular house current (120 V, 60 Hz). Use acircuit equipped with a 15 ampere fuse or circuitbreaker. Use a 20 ampere fuse if dishwasher isconnected with a food waste disposer. Under certain conditions, hydrogen gas may beproduced in a hot water system that has notbeen used for 2 weeks or more. HYDROGENGAS IS EXPLOSIVE. If hot water system hasnot been used for such a period, before usingdishwasher, turn on all hot water faucets and letwater flow from each for several minutes. This willrelease any accumulated hydrogen gas.HYDROGEN GAS IS FLAMMABLE. Do notsmoke or use an open flame during this time. Do not store or use combustible materials,gasoline or other flammable vapors and liquids inthe vicinity of this or any other appliance. Do not wash plastic items unless marked"dishwasher safe" or the equivalent. If notmarked, check with manufacturer forrecommendations. Items that are not dishwashersafe may melt and create a potential fire hazard. To avoid entrapment and/or suffocation, removedoor or door latch mechanism from anydishwasher that is discarded or not in use.16021814 Rev. 0 2002 Maytag Appliance Sales Company

Important Safety InformationPRECAUCIÓN:Desconecte laenergía eléctricaantes de darieservicio.ATENCIÓN:Solamente useconductores decobre. Use cables desuministro adecuadospara 75 (167 F).CAUTION: Disconnect electrical powerbefore servicing.ATTENTION: Use copper conductors only.Use supply wires suitable for 75 C (167 F).ATTENTION: Débrancher del'alimentation électrique avant tout dépannage.ATTENTION: Utiliser des conducteurs encuivre uniquement. Utiliser des filsd'alimentation pouvant supporter unetempérature de 75 C (167 F).GROUNDING: This unit mustbe grounded in accordance with localand/or national electric codes.WARNING: The heatingelement, drain pump, harness clip,dispenser mount, and water valve areintentionally not grounded and maypresent a risk of electrical shock onlyduring servicing. Discharge motorcapacitior before servicing. Failure tofollow these instructions can result indeath, serious injury, fire, or electricalshock. 2002 Maytag Appliance Sales CompanyMISE Á LA TERRE: Cet appareildoit être relié à la terre conformément auxcodes électriques locaux et/ou nationaux.AVERTISSEMENT: La résistance,la pompe de vidange, l'attache du hamais, lamonture de distributeur et l'électrovanne nesont pas reliés à la terre intentionnellement etpeuvent présenter des risques d'électrocutionuniquement en cas d'intervention de serviceaprés-vente. Décharger le condensateuravant toute intervention. Le non-respect deces consignes peut entrainer la mort, desblessures graves, l'incendie ou l'électrocution.16021814 Rev. 0CONEXIÓN A TIERRA: Estaunidad debe estar conectada a tierra deacuerdo con los códigos eléctricos locales ynacionales.ADVERTENCIA: El elemento calentador,la bomba de drenado, el sujetador del arnés,el montaje del surtidor y la válvula deagua están sin conectar a tierraintencionalmente podrían presentar un riesgode descargas eléctricas cuando se les daservicio solamente. El no seguir estasinstrucciones podría causar la muerte, lesionesgraves, incendios o descargas eléctricas.1-5

1-616021814 Rev. 0 2002 Maytag Appliance Sales CompanyWARNING: Disconnect power before servicing. Electronic control is energized at all times untilpower is disconnected. Capacitors on control may remain active after electrical power is disconnected.Failure to follow these instructions can result in death, serious injury, fire, or electrical shock.ADVERTENCIA: Desconecte la energí antes de darle servicio. El control electrónico estáenergizado todo el tiempo hasta que se desconecta la energía. Los capacitores del control podríanpermanecer activos después de desconectar la energía eléctrica. El no seguir estas instruccionespodrí causar la muerte, lesiones graves, incendios o descargas eléctricas.AVERTISSEMENT: Débrancher avant toute intervention. La commande électronique estconstamment sous tension à moins que l'appareil ne soit débranché. Les condensateurs de lacommande peuvent rester sous tension une fois l'appareil débranché. Le non-respect de ces consignespeut entraîner la mort, des blessures graves, l'incendie ou l' électrocution.ilu nt e d.es nn ectlt imal d is cod at r i serg izep ow ock. ál sh e st d r aí ns ee altric icaol iico po esn tr elec lec trr ón tr ol ci onic coa fte r or eel ectl c on uce,r one ct a ct ive y, firt r ol de s in strron re s. Elng m ain s inju . E lcac ito i r e staesti cier v y re r iou r vic io cap se guu e lan ese s lm a , sese L os noro niq d e on sigoorcect teu rsb ef n tr de ath da rle rgí a. a . El as .esélco inerde e ne c tr ic ct ric nd e nsa de cde ctp ow s on su lte lées laelémane ct a cit ora n re gí a nt c ta rg í a rg as com s con e sp e-rLec on C ap n s c en er co ne ene es ca.nonesn. La é.Dis: ne ctedint ru ctio ct e lae se d ct ar laios o d e nt iobra n ch . L e .dennene quc hé ont erv d éNINGco essco inc en te in s oit br an tr oc utis co st adis th,deDeWARr i s fo llo w IA: p o ha d e ves n t t oueil n e rei l dé élecel'graésva arCp owr e topa ouspur a ppEN e lt iemd es io ne che e l'a ois l'apn d ieRT doF ailuf nceVE o to iv os e, les br an s quADgiz ad ce r actmu e tr Dé mo in io n u neve s, l'ieerT:o n à te ns g raan r laens u ressa EMENrmnsipe í c auS s te r s ou ssdrTISt s ou res te s blepoER en n t t, deAVta mm p euvela m ornsco an de înerrae ntco mmutpeImportant Safety Information

Section 2. Electrical Equipment & TestingElectrical Test EquipmentThe equipment required to service these models dependslargely upon the condition encountered. Locating amalfunction will often require the use of electrical testingequipment such as:Appliance Test MeterClamp-On AmmeterMotor Test CordDigital Test Metercan be used to check for openor closed circuits, measureresistance, AC and DC volts,and temperature.Appliance Test MeterAn Appliance Test Meter is a multi-purpose testercombining an AC/DC voltage tester with a multi-rangeohmmeter.The easiest means of testing electrical components is"Continuity Testing" with an appliance meter. Continuityis a complete or continuous path from one point in anelectrical circuit to another.Analog Test Metercan be used to check foropen or closed circuits,measure resistance, AC andDC volts, and temperature.The obvious advantages of being able to check electricalcomponents and circuits without power applied is one ofthe features of the Ohmmeter. Multiple ranges allowaccurate determination of resistances of both singlecomponents and entire circuit paths. Resistance ismeasured in "Ohms."! WARNINGTo avoid risk of personal injury or death due toelectrical shock:Always be sure the power has been disconnectedbefore making resistance measurements. Failure todo so will also result in damage to your meter!Internal batteries provide all the power needed tomake resistance checks. They should be checkedat least once a year and replaced as needed.Continuity Testing: is a process of eliminating electricalcomponents involved in a given function of the appliance,until the inoperative part is found. By reviewing the list ofpossible electrical problems under a given condition, andthen performing appropriate continuity checks of the partsinvolved, you should be able to locate the electricalcomponent which is inoperative.NOTE: When checking components or circuit paths forcontinuity, external wiring should be disconnected toeliminate false readings through external paths. Isolatewhat you want to test. 2002 Maytag Appliance Sales Company16021814 Rev. 02-7

ELECTRICAL EQUIPMENT & TESTINGVOLTAGE CHECKSUse of Ammeter on dishwasher:Generally, these checks will consist of taking readingsat the wall receptacle in order to determine theavailability of voltage to the product. Voltage checks onindividual components of a product are notrecommended due to the possibility of electrical shock.Component part testing is best accomplished throughcontinuity checks with an Appliance Test Meter.1. Motor Current - the reading can be taken at theleads on the motor start relay or at the male connector.NOTE: Use of the meter on voltage higher than theindicated range may cause permanent damage to themeter. To prevent damage, first select highest range andthen lower the range for readings which fall within thelower scale.Motor Test CordClamp-On Ammetercan be used to detect shorts.Overloads on the circuit breakeror fuse can be tracedto either the applianceor circuit breaker bychecking the currentdraw.2. Heating Element Current - The reading can betaken using either lead to the element.! DANGERTo avoid risk of personal injury or death due toelectrical shock: Disconnect electrical power to dishwasher beforeservicing. Always plug test cord into a properly groundedreceptacle. Always make connection to components beforeplugging test cord into receptacle.Each circuit in an appliance has a "Normal" currentdraw, which is an indication of the performance of thatcircuit. Current draw levels of less than or more thannormal give clues to possible malfunctions. The clampon ammeter measures th

dishwasher. Use only detergents and rinse agents recommended for use in a dishwasher. Store dishwasher detergent and rinse agents out of the reach of children. If the dishwasher drains into a food disposer, make sure disposer is completely empty before running dishwasher. Repairs should be done by a qualified technician.

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