Hoover 38900018 Service Manual
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Hoover 38900018 Service Manual

Built-in microwaves ovens
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BUILT-IN MICROWAVES OVENS
38900018 HMG200X
Service Manual

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Summary of Contents for Hoover 38900018

  • Page 1 BUILT-IN MICROWAVES OVENS 38900018 HMG200X Service Manual...
  • Page 4 38900018 HMG200X 0827 (01/07/2008) Ricambio Inizio Fine Part No. Beginning Ending Piece Debut E-Teil Begin Ref. Descrizione - Description - Beschreibung - Descripcion Pieza Inicio Cover 49016739 Oven cabinet assy. 49016713 Oven door assy. 49016852 Knob 49016787 Knob insert 49016804...
  • Page 5 38900018 HMG200X 0827 (01/07/2008) Ricambio Inizio Fine Part No. Beginning Ending Piece Debut E-Teil Begin Ref. Descrizione - Description - Beschreibung - Descripcion Pieza Inicio Pushbutton spring 49010742 Motor shaft hub 49006055 Motor 49006054 Rotating plate 49009960 Switch assy 49016789...

  • Page 7: Safety Precautions

    SAFETY PRECAUTIONS This device is to be serviced only by properly qualified service personnel. Consult the service manual for proper service procedures to assure continued safety operation and for precautions to be taken to avoid possible exposure to excessive microwave energy. PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY...
  • Page 8 CAUTIONS Unlike other appliances, the microwave oven MICROWAVE RADIATION high-voltage and high-current equipment. Personnel should not be exposed to the Though it is free from danger in ordinary use, microwave energy which may radiate from the extreme care should be taken during repair. magnetron or other microwave generating device if it is improperly used or connection.

  • Page 9: The Heating Principle Of Microwave

    THE HEATING PRINCIPLE OF MICROWAVE Microwave is one kind of radio wave whose wave length is very short, frequency is very high. Therefore, it is called ultrahigh frequency electromagnetic wave. Microwave can heat food mainly result in the mutual affect of the food in the microwave field and microwave field itself.

  • Page 10: Installations

    INSTALLATIONS BEFORE YOU BEGIN, READ THE FOLLOWING INSTRUCTIONS COMPLETELY INSTALLING EARTHING INSTRUCTIONS 1. Empty the microwave oven and clean inside it with This microwave oven is designed to be used in a fully a soft, damp cloth. Check for damage such as earthed condition.

  • Page 11: Circuit Description

    CIRCUIT DESCRIPTION As the door is closed, the contact of MONITOR • 3.2 volts AC is generated from the filament winding of SWITCH opens. This switch creates the short circuit to the high voltage transformer. This 3.2 volts is applied blow fuse during operation under abnormal condition.

  • Page 12: Tools And Measuring Instruments

    SERVICE INFORMATION TOOLS AND MEASURING INSTRUMENTS NECESSARY TOOLS NECESSARY MEASURING INSTRUMENTS Tools normally used for TV servicing are sufficient. Standard tools are listed below. • TESTER(VOLTS-DC, AC., Ohmmeter) • Diagonal pliers • Microwave survey meter • Long nose pliers - Holaday HI-1710(A) •...
  • Page 13 MEASUREMENT WITH OUTER CASE NOTES WHEN MEASURING REMOVED • Do not exceed meter full scale deflection. • When you replace the magnetron, measure for • The test probe must be removed no faster than microwave energy leakage before the outer case is 1 inch/sec (2.5 cm/sec) along the shaded area, installed and after all necessary components are otherwise a false reading may result.

  • Page 14: Measurement Of Microwave Power Output

    MEASUREMENT OF MICROWAVE POWER OUTPUT • Microwave power output measurement is made with • The microwave power output P in watts is the microwave oven supplied at its rated voltage and calculated operated at its maximum microwave power setting with approximately from the following formula : a load of (1000±5) g of potable water.

  • Page 15: Troubleshooting Procedures

    TROUBLE SHOOTING PROCEDURES Before overhauling a microwave oven, you should judge the breakdown and the cause correctly, then you can repair it with corresponding ways. The overhauling must be proceed in order, any hasty conclusion is not recommendable, otherwise overworking would be done when repair. The microwave oven may occur compound breakdown due to all kinds of different reasons, thus, when overhaul, they all should be taken into consideration.
  • Page 16 Examine when the oven at operating, but the food can’t be heated Pull out the power plug, take off the outer case, discharge the capacitor, measure the resistance value of the primary winding and the secondary winding of the transformer with a multi meter (FIG.5-3 and FIG.5-4). The resistance value of the primary winding should be about 2.2 ohm, the secondary winding should be about 130 ohm, otherwise, it indicates the transformer has broken, and should be replaced by a new one.
  • Page 17 FIG5.10 FIG.5-9 Ⅲ.REPAIRING METHOD OF SEVERAL BREAKDOWN Repair when there occurred large amounts microwave leakage. There are many factors, which may cause microwave leaking. Following mentioned may be the main cause of microwave leakage: (1) The door deformed, the hinge loosed or damaged that caused the door can not close tightly. (2) The door pressing cover or the embed piece damaged or come off.
  • Page 18 Means of repair when the oven can heat, but the turntable glass can’t move Firstly, check whether the turntable holder is placed correctly. If it is correct, then pull out the power plug and take down the turntable combination, measure the resistance value of the turntable motor with Rx1k grade of a multi meter If it is open- circuited, it indicates the turntable motor has broken, and should be replaced by a new, same model one.
  • Page 19 MOTOR TEST PROCEDURE COMPONENTS TEST PROCEDURE RESULTS Measure the resistance. Fan Motor (Ohm-meter scale:R×100) Normal:Approx. 47 (Wire leads removed) Abnormal: or Several Measure the resistance. Turntable Motor (Ohm-meter scale:R×1000) Normal:Approx. 3.2k (Wire leads removed) Abnormal: or Several NOTE: A MICROWAVE LEAKGE TEST MUST ALWAYS BE PERFORMED WHEN THE UNIT IS SERVICED FOR ANY REASON.

  • Page 20: Common Breakdown And Means Of Repairing

    COMMON BREAKDOWN AND MEANS OF REPAIRING PHENOMENON CAUSE REPAIRING MEANS 1. fuse broken 1. Change a new fuse. 2. The primary and secondary winding of the 2. Change transformer are short-circuited. transformer. 1.When starting 3. The earthing or the polarity of the capacitor is 3.
  • Page 21 IMPORTANT THINGS TO DO PRIOR TO CRITICAL PART SERVICING The following instructions are CRITICAL to the owner’s safety. Be sure to follow all the instructions. Contact the manufacturer of distributor if you have any question. If the oven is operative prior to servicing a Microwave Leakage Test (Microwave Emission Check) should be performed prior to servicing the oven.

  • Page 22: Safety Checks And Tests After Serving

    SAFETY CHECKS AND TESTS AFTER SERVING Constructional Checks If mechanical or electrical(electronic) parts have been replaced be sure to follow the following steps. Check for correct wiring, adequate mechanical decrements of parts, and firm connectors. Check for adequate grounding. Check the following items before turning the oven ON. Proper door closing, seal/choke surfaces, and hinges.

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Hmg200x

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