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Welbilt Merrychef microMD UK, Руководство по обслуживанию

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14

Microwave service manual – Model:

 

microMD UK

Components test procedure

Cautions: 

1. Disconnect the power supply cord from the outlet whenever removing the outer

case from the unit. Proceed with the test only after discharging the high voltage

capacitor and removing the wire leads from the primary winding of the high voltage

transformer. (See page 

x-x

)

2. All operational checks with microwave energy must be done with a load (1 litre of

water in container) in the oven.

Components

Test procedure

Results

High voltage transformer 

(Wire leads removed)

1. Measure the resistance.

(Ohm-meter scale: Rx1)

• Primary winding

• Secondary

• Filament winding

2. Measure the resistance.

(Ohm-meter scale: Rx1000)

• Primary winding to ground

• Filament winding to ground

Approx: 1.4 ohm 

Approx: 90 ohm 

Less than: 1 ohm

Normal: Infinite 

Normal: Infinite

Magnetron 

(Wire leads removed)

1. Measure the resistance.

(Ohm-meter scale: Rx1)

• Filament terminal

2. Measure the resistance.

(Ohm-meter scale: Rx1000)

• Filament to chassis

Normal: Less than 1 ohm

Normal: Infinite 

PRIMARY  

TERMINAL

SECONDARY  

WINDING

FILAMENT 

WINDING

TERMINAL

Содержание Merrychef microMD UK

Страница 1: ...m Merrychef This document is published to be used for after sales service only The content is subject to change without prior notice In interest of user safety the appliance should be restored to its...

Страница 2: ...ge Capacitor And Diode Removal___________ 10 Magnetron Removal___________________________________ 10 Removing The Turn Motor_____________________________ 10 High Voltage Transformer Removal___________...

Страница 3: ...he door seal and front plate of the oven cavity Never put iron tools on the magnetron Never put anything into the latch hole and the interlock switches area Microwave radiation Personnel should not be...

Страница 4: ...n a sturdy and flat surface at least 10 cm 4 inches from the wall 7 Place the microwave oven as far away as possible from TV radio computer etc to prevent interference Important The wires in this main...

Страница 5: ...pplied to the filament of the magnetron When the oven is set at any level except maximum The micom controller controls the ON OFF time of relay 2 by the applied signal to vary the average output power...

Страница 6: ...ion levels at no cost to the owner and should ascertain the cause of the excessive leakage The service personnel should instruct the owner not to use the unit until the oven has been brought into comp...

Страница 7: ...mW cm2 sq Notes when measuring Do not exceed meter full scale deflection The test probe must be removed no faster than 1 inch sec 2 5 cm sec along the shaded area otherwise a false reading may result...

Страница 8: ...s the temperature rise The initial and final water temperatures are selected so that the maximum difference between the final water temperature and the ambient temperature is 5 K The microwave power o...

Страница 9: ...After replacing the door be sure to check that the primary switch monitor switch and secondary switch operate normally 2 After replacing the door check for microwave energy leakage with a survey mete...

Страница 10: ...turntable motor 1 Disconnect the wire and remove the turntable motor on the top of the cavity 2 Turn the whole unit over 90 degrees Loose screw and remove the bottom cover 3 Disconnect the wire and t...

Страница 11: ...nect the leadwire from magnetron high voltage transformer and capacitor 3 Remove the screw holding the high voltage transformer to the baseplate 1 The inner cover needs to be removed to repair the bot...

Страница 12: ...bly Mount the latch board to the oven assembly Adjust the latch board in the arrow direction so that oven door will not have any play in it when the door is closed Tighten the mounting screw Check for...

Страница 13: ...nals of the switch The meter should indicate a open circuit in the door open condition When the door is closed meter should indicate a closed circuit When the secondary switch operation is abnormal ma...

Страница 14: ...ter in container in the oven Components Test procedure Results High voltage transformer Wire leads removed 1 Measure the resistance Ohm meter scale Rx1 Primary winding Secondary Filament winding 2 Mea...

Страница 15: ...scale Rx1000 Terminal to terminal Normal Momentarily indicates several ohms and then gradually returns to 10M ohms Measure the resistance Ohm meter scale Rx1000 Terminal to case Normal High voltage di...

Страница 16: ...improper switch operation replace the defective switch and the fuse at the same time Replace just the fuse if the switches operate normally Thermal cut out Below specified temperature Above specified...

Страница 17: ...or several Turntable motor Wire leads removed Measure the resistance Ohm meter scale Rx1000 Normal Approx 100 200K Abnormal or several Notes A microwave leakage test must always be performed when the...

Страница 18: ...ing on this panel to discharge any static charge built up in your body Condition Cause Remedy Inserting many plugs into one plug outlet and using them at the same time causes overloading Using metalli...

Страница 19: ...y Loose connection Replace PCB assembly Replace PCB assembly Connect them tightly 1 Incomplete segments Segment missing Partial segment missing Digit ickering NOTE Slight ickering is normal 2 Colon do...

Страница 20: ...Shorted contact at the primary switch Defective high voltage capacitor Defective high voltage transformer Replace primary and monitor switches Replace high voltage capacitor Replace high voltage trans...

Страница 21: ...e fan motor Replace oven lamp No continuity Continuity Abnormal Check oven lamp Normal No continuity Abnormal Check fan motor Check continuity of secondary switch with door closed Continuity Defective...

Страница 22: ...gh voltage diode Defective magnetron Replace high voltage transformer Replace high voltage capacitor Replace high voltage diode Replace magnetron No continuity Abnormal Normal Normal Normal Abnormal A...

Страница 23: ...rvice manual Model microMD UK Note The manual may update without prior notice Please download the latest version on website https tsp midea com Attached files list 1 Exploded view 2 Spare parts list 3...

Страница 24: ...24 Microwave service manual Model microMD UK B01 Exploded view...

Страница 25: ...25 Microwave service manual Model microMD UK...

Страница 26: ...26 Microwave service manual Model microMD UK Exploded view...

Страница 27: ...27 Microwave service manual Model microMD UK...

Страница 28: ...ilt offers fully integrated kitchen systems and our products are backed by KitchenCare aftermarket parts and service Welbilt s portfolio of award winning brands includes Cleveland Convotherm Crem Delf...

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