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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 original condition and only
parts identical to those should be applied.
Expanding your opportunities
Micro
Service
manual
Model:
microMD UK
www.merrychef.com
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Table of Contents
Related Manuals for Welbilt Merrychef microMD UK
Summary of Contents for Welbilt Merrychef microMD UK
- Page 1 Service Merrychef manual Micro Model: This document is published to be used for after sales service only. microMD UK The content is subject to change without prior notice. In interest of user safety the appliance should be restored to its original condition and only parts identical to those should be applied.
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Page 2: Table Of Contents
Microwave service manual – Model: microMD UK Contents Precautions __________________________________________________ 3 Installations __________________________________________________ 4 Service information __________________________________________ 5 Circuit description _________________________________________ 5 Tools and measuring instruments _________________________ 6 Microwave leakage test __________________________________ 6-7 Measurement of microwave power output ________________ 8 Disassembly and adjustment ______________________________ 8 Removing The Door ___________________________________ 9 Removing The Cooling Fan_____________________________... -
Page 3: Precautions
Microwave service manual – Model: microMD UK Precautions Unlike other appliances, a Microwave radiation microwave oven is a high voltage and high current piece of Personnel should not be exposed to the equipment. microwave energy which may radiate from the magnetron or other microwave In ordinary use there is no danger generating device if it is improperly used in it use, however extreme care... -
Page 4: Installations
Microwave service manual – Model: microMD UK Installations Before you begin, read the following instructions completely and carefully. Installing Earthing instructions 1. Empty the microwave oven and clean inside This microwave oven is designed to be used in it with a soft, damp cloth. Check for damage a fully earthed condition. -
Page 5: Service Information
Microwave service manual – Model: microMD UK Service information Circuit description winding of the high voltage transformer. This 3.2 volts is applied to the magnetron to heat the magnetron filament through two noise General details preventing choke coils. • The low voltage transformer supplies the •... -
Page 6: Tools And Measuring Instruments
Microwave service manual – Model: microMD UK Service information Tools and measuring instruments Necessary measuring instruments Necessary tools Tools normally used for TV servicing are sufficient. • TESTER (VOLTS-DC, AC., Ohmmeter) Standard tools are listed below. • Microwave survey meter •... - Page 7 Microwave service manual – Model: microMD UK Measurement with outer case Notes when measuring removed • Do not exceed meter full scale deflection. • When you replace the magnetron, measure • The test probe must be removed no faster than for microwave energy leakage before the 1 inch/sec (2.5 cm/sec) along the shaded area, outer case is installed and after all necessary...
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Page 8: Measurement Of Microwave Power Output
Microwave service manual – Model: microMD UK Measurement of microwave power output (I think there is some copy missing here!) • Microwave power output measurement is made is measured while the microwave generator is with the microwave oven supplied at its rated operating at full power. -
Page 9: Removing The Door
Microwave service manual – Model: microMD UK 2. Power supply cord that the primary switch, monitor switch, and secondary switch operate normally. 1) Remove the outer case. 2. After replacing the door, check for microwave 2) Disconnect two terminals, and remove one energy leakage with a survey meter. -
Page 10: High Voltage Capacitor And Diode Removal
Microwave service manual – Model: microMD UK 6. Magnetron removal 7. Fan assembly removal 1) Disconnect the leadwire from the high voltage 1) Release the screws and take out the fan transformer and high voltage capacitor. assembly. 2) Remove the air guide. 2) Separate the fan motor, fan guide and fan. -
Page 11: High Voltage Transformer Removal
Microwave service manual – Model: microMD UK 12. Stirrer assembly removal Remove the second magnetron first. Remove the screws on both side. Take out the whole baseplate assemble. 1) The inner cover needs to be removed to repair the bottom stirrer assembly. 2) The inner cover is fixed in the cavity by glue. -
Page 12: Interlock System
Microwave service manual – Model: microMD UK 13. Interlock system 1) Interlock mechanism The door lock mechanism is a device which has been specially designed to eliminate completely, microwave activity when the door is opened during cooking and thus to prevent the danger resulting from the microwave leakage. -
Page 13: Interlock Continuity Test
Microwave service manual – Model: microMD UK Interlock continuity test Warning: For continued protection against excessive radiation emission, replace only with identical replacement parts. Type No. KW3A for switches 1. Primary interlock switch test 2. Secondary interlock switch test When the door release button is depressed Disconnect the wire lead from the secondary slowly with the door closed, an audible switch. -
Page 14: Component Test Procedure
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. - Page 15 Microwave service manual – Model: microMD UK Components Test procedure Results Antenna Gasket Chassis Filament Note: When testing the magnetron, be sure to install the magnetron gasket in the correct position and be sure that the gasket is in good condition. High voltage capacitor Measure the resistance.
- Page 16 Microwave service manual – Model: microMD UK Components Test procedure Results Fuse Check for continuity of the fuse with a Normal Abnormal multi-meter. Note: If the fuse is blown, check the primary, the secondary, and the monitor switches, H.V.D. and H.V.C. before replacing the fuse. If the fuse is blown by improper switch operation replace the defective switch and the fuse at the same time.
- Page 17 Microwave service manual – Model: microMD UK Components Test procedure Results Fan motor Measure the resistance. Normal: 100 ~ 500 Ω (Wire leads removed) (Ohm-meter scale: Rx1) Abnormal: ∞ or several Ω Turntable motor Measure the resistance. Normal: (Wire leads removed) (Ohm-meter scale: Rx1000) Approx.100 ~ 200K Ω...
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Page 18: Trouble Shooting
Microwave service manual – Model: microMD UK Trouble shooting If you receive a complaint from your customer, evaluate the complaint carefully. If the following symptoms apply, please instruct the customer in the proper use of the microwave oven. This can eliminate an unnecessary service call. - Page 19 Microwave service manual – Model: microMD UK (Trouble 1) The following visual conditions indicate a probable defective control circuit. 1. Incomplete segments. • Segment missing. • Partial segment missing. • Digit flickering (NOTE: Slight flickering is normal.) 2. Colon does not turn on or blink. 3.
- Page 20 Microwave service manual – Model: microMD UK (Trouble 2) Oven does not operate at all; display window does not display any figures and no input is accepted. Condition Check Result Cause Remedy Malfunction of the Replace primary and Check continuity 1.
- Page 21 Microwave service manual – Model: microMD UK (Trouble 3) Display shows all figures set, but oven does not start cooking while desired programme times are set and START pad is touched. Condition Check Result Cause Remedy Defective secondary Replace secondary Check continuity of 1.
- Page 22 Microwave service manual – Model: microMD UK (Trouble 5) No microwave oscillation even though oven lamp and fan motor run (Display operates properly) Condition Check Result Cause Remedy Defective P.C.B Replace P.C.B No microwave Disconnect the wire No continuity. assembly assembly.
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Page 23: Attached Files List
Microwave service manual – Model: microMD UK Attached files list 1. Exploded view 2. Spare parts list 3. Wiring diagram Note: The manual may update without prior notice. Please download the latest version on website: https://tsp.midea.com. - Page 24 Microwave service manual – Model: microMD UK Exploded view...
- Page 25 Microwave service manual – Model: microMD UK...
- Page 26 Microwave service manual – Model: microMD UK Exploded view...
- Page 27 Microwave service manual – Model: microMD UK...
- Page 28 Welbilt 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 ® ® Delfield , fitkitchen , Frymaster , Garland , Kolpak , Lincoln™, ®...
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