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Summary of Contents for Merrychef MD0750
- Page 1 Merrychef MD-SERIES S E R V I C E M A N U A L Part No. 32Z3329 Issue No. 6 For all MD-Series models manufactured from January 2001 CAUTION MICROWAVE EMISSIONS DO NOT BECOME EXPOSED TO EMISSIONS FROM THE MICROWAVE...
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Page 2: Table Of Contents
Merrychef Limited, Station Road West, Ash Vale, Aldershot, Hampshire, GU12 5XA United Kingdom Tel: +44 (0)1252 371000 Fax: +44 (0)1252 371007 Internet address: http://www.merrychef.com E-mail: sales@merrychef.com or service@merrychef.com MD Series Ovens 32Z3329 Issue 6 Page 2... -
Page 3: Safety Code
SAFETY CODE This manual is designed to assist engineers who have been on a recognised product familiarisation and training course run by Merrychef Limited. It has been prepared to offer technical guidance for the Merrychef MD Series Commercial Microwave Ovens. -
Page 4: Product Specifications
MD1800C45UK 230-240V ac 50 Hz 13.0A Single Phase 2 Wire + Earth MD1800C25EX 220-230V ac 50 Hz 14.2A Single Phase 2 Wire + Earth Power Output MD0750 750W ( IEC 705 ) MD1000 1000W ( IEC 705 ) Microwave 100%... -
Page 5: Installation Instructions
Installation instructions Power Supply Requirements The oven should be connected to a suitable electricity supply, which can cope with the switching- on surge that occurs with certain types of catering equipment, such as microwaves. Because of this requirement, we strongly recommend that a separate, suitably rated supply is installed for the oven. -
Page 6: Error Codes And Diagnostics
Error codes and diagnostics The MD series oven will identify some of the most common problems by flashing an error message code in the time display window. These are the error messages, and suggestions for repairing them. Door not fully shut Close door fully Possible electrical fault Check microswitch door circuit... -
Page 7: Power Output Testing To Bs En 60335-2-90
Procedure A - Power Output Test in accordance with BS EN 60335-2-90 Annex AA This test is given in the BSI test standard for microwave ovens. It is reproduced below - not so that you can follow it, but to show you why it is impractical in normal conditions. A simplified procedure, which gives a good approximation to the BSI power output, is given in Procedure B which follows. -
Page 8: Power Output Testing
Procedure B - Simplified Power Test You will need: A thermometer capable of reading to ±0.1°C. A Polypropylene tray approximately 200mm x 200mm. A measuring jug. A calculator. Water which is at a temperature of 10°C ± 2°C. 1 Measure 1 litre of cold water into the tray using the measuring jug. 2 Measure the water temperature, and record it as T[s]. -
Page 9: High Voltage Capacitor Test
Procedure D - High Voltage Capacitor Test You will need: A Digital Multi-meter (D.M.M.) A Megger or similar resistance meter using 500V d.c. WARNING: High voltages and large currents are present at the High Voltage Capacitor. It is very dangerous to work near this part when the oven is on. NEVER make any voltage measurements at the High Voltage circuits, including the magnetron filament . -
Page 10: Exploded View
January 2007, MD1000, MD1400 & MD1800 See APPENDIX 2 MD1800 [January 2007] Note: Models MD0750 & MD1000 have one Magnetron Assembly only ( Parts 51 & 61 ) Model Part MD0750 (Tesco) HV Capacitor 0.74µF 30M0098 HV Capacitor 1.0µF... -
Page 11: Door Assembly
Door assembly MD-Series Note that the MD1800 currently in production has a different door interlock system to earlier MD Series models and can be identified from the handle which is solid and does not have the door catch release mechanism on the inside face of the handle. Door Handle Models before January 2007, MD1000, MD1400 &... -
Page 12: Door Replacement And Adjustment
Door replacement and door adjustment After any service work to the door, the oven should always be checked for microwave leakage with a suitable meter DOOR REPLACEMENT Remove four screws holding the Upper and Lower Hinge Plate [14] to the oven cavity. Remove Door Assembly [80] by pulling it forward. -
Page 13: Door Servicing
Door servicing CHOKE COVER REMOVAL 1. Insert a flat type screw driver into the gap between the Choke Cover [16] and Door Body [7] as shown below to free the engaging clips. A protective piece of tape should be used so as not to damage the door panel. -
Page 14: Door Interlock Operation
Door interlock operation Door interlock operation The door on the oven is monitored by four microswitches. Three of these are used in the conventional “Primary, Secondary and Monitor” switch arrangement shown below, while the fourth is a low-voltage switch linked directly to the control circuitry. Door interlock arrangement Power In Power Out... -
Page 15: Membrane Panel Circuit
Membrane panel circuit You will need: A Digital Multi-meter (D.M.M.) Procedure: 1. Isolate the oven from the mains supply. 2. Remove the Logic Assembly from the Control Panel Housing. 3. Unplug the membrane “tail” from the Logic PCB Assembly. 4. Using a D.M.M., check for continuity between the correct terminals when the pads are pressed. -
Page 16: Input Wiring Details
Input wiring details Brown Blue Green/Yellow Mains Cable Assy 31Z0220 Strain Relief Bush 31Z1036 Rear Panel 30M0060 Fuse Cover 20Z1080 16A Mains Filter 30Z0997 Fuse Holder 30Z0231 Fuse 13A Anti surge 30Z0168 MD Series Ovens 32Z3329 Issue 6 Page 16... -
Page 17: Part Number Identification List
Part number identification chart 1 Description MD1000 MD1400 MD1800 MD1800 Pre Jan 2007 From Jan 2007 Part No. Part No. Part No. Part No. Outer Handle 30M0001 30M0001 30M0001 30M4002 Handle Bearing (4) 30M0002 30M0002 30M0002 30M0002 Inner Handle 30M0003 30M0003 30M0003 30M4003... - Page 18 Part number identification chart: Description MD1000 MD1400 MD1800 MD1800 Pre Jan 2007 From Jan Part No. Part No. Part No. Part No. Lamp Cover 30M0044 30M0044 30M0044 30M0044 Back Case 30M0045 30M0045 30M0045 30M0045 Rear Air Guide 30M0046 30M0046 30M0046 30M0046 Upper Air Duct 30M0047...
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Page 19: Wiring Diagram
Circuit diagram: MD Series Ovens 32Z3329 Issue 6 Page 19... -
Page 20: Appendix 1: Cleaning Procedure
Undo screw on panel on side of the oven and remove panel Replace light bulb Part No. 33M0038 and replace panel and tighten screw. NOTE: Light bulbs are not covered by the warranty and can be purchased by contacting Merrychef Service Dept. MD Series Ovens 32Z3329 Issue 6 Page 20... -
Page 21: Appendix 2: Door Interlock All Models Before Jan 2007
APPENDIX 2: Door interlock details Models before January 2007, MD1000, MD1400 & MD1800 Description Part No. Outer Handle 30M0001 Inner Handle 30M0003 Door Catch (2) 30M0009 Door Catch Link Rod 30M0010 Door Spring 30M0011 Door Catch Crank 30M0013 Interlock/ Switch Holder 30M0065 66 a-d Microswitch V5S010CB... -
Page 22: Manual Corrections And Modifications
Name Address Page on which error occurs- MD 1800: Description of error Suggestion for improvement to manual Please return this form to: Service Department Merrychef Ltd Station Road West Ash Vale Aldershot Hampshire GU12 5XA Or Fax it on: +44 (0) 1252 371007 E-Mail quality@merrychef.com...
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