Merrychef
MD-SERIES
SERVICE MANUAL
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
GENERATOR OR PARTS CONDUCTING MICROWAVE ENERGY
Page 1 MD Series Ovens 32Z3329 Issue 6
SERVICE MANUAL
Table of Contents
Safety Code...........................................................................3
Product Specifications ..........................................................4
Installation Instructions ..........................................................5
Error Codes and Diagnostics.................................................6
Power Output Testing to BS EN 60335-2-90.........................7
Power Output Testing............................................................8
Power Transformer Test........................................................8
High Voltage Capacitor Test..................................................9
High Voltage Rectifier Test....................................................9
Magnetron Test .....................................................................9
Exploded View ....................................................................10
Door Assembly ....................................................................11
Door Replacement and Adjustment.....................................12
Door Servicing .....................................................................13
Door Interlock operation ......................................................14
Membrane Panel Circuit ......................................................15
Input Wiring Details .............................................................16
Part Number Identification List ...................................... 17-18
Wiring Diagram ...................................................................19
Appendix 1: Cleaning procedure .........................................20
Appendix 2: Door interlock All Models before Jan 2007......21
Manual Corrections and Modifications ................................22
From January 2007 only the MD1800 Microwave Oven model is
being manufactured. All the other MD Series ovens are
discontinued.
Note that the MD1800 currently in production has a different door
interlock system to the earlier model 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.
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
Page 2 MD Series Ovens 32Z3329 Issue 6
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.
Please remember that it is wiser not to attempt a service task if you are unsure of being able to
complete it competently, quickly, and above all safely.
To avoid injury to yourself, and to protect the appliance from possible damage, please follow this
Safety Code when servicing these ovens.
Before attempting to repair the oven, check it for microwave leakage.
Check that the oven is not emitting microwaves, even when supposedly not in operation.
Check that the oven is not operating continuously, whether the display indicates cooking
or not.
Always discharge the HT capacitors before working on the oven using a suitably
insulated 10 MΩ Resistor
Before removing the rear cover from the oven, ensure you do the following:
• Switch off the mains supply and remove the plug from the wall socket.
or
• If the oven is hard wired, ensure that the power is turned off at the isolator switch.
Note: the oven does NOT have an On/Off switch.
Upon completion of a service on an MD Series oven, or before reconnecting the appliance to the
mains supply for testing, check all of the following points:
• All internal electrical connections are correct.
• All wiring insulation is correct and is not touching a sharp edge.
• All Earth connections are electrically and mechanically secure.
• All four door safety interlocks are secure and mechanically sound.
• The door operation is smooth.
• The door activates all four of the door interlock switches in the correct order.
• All fuse-holder safety covers are correctly fitted.
Before finishing the service call, recheck the following points:
• All of the electronics are functioning correctly, and all of the touch pads are working.
• The power output of the oven is correct (see pages 7 & 8 ).
• Microwave emission is below permissible limit - 5mW/cm² (see BS EN 60335-2-90:).
• Oven has correct 50mm air gap all round. Air flow should not be restricted.
Page 3 MD Series Ovens 32Z3329 Issue 6
Product specifications
Model Number: MD + Power + Voltage + Frequency + Country
For example: MD1800C25EX
Model MD 1800 (1000W) , 220-230V, 50Hz, Export model
Only Model MD1800 is currently manufactured
Model prefix Voltage Frequency Country
MD
Power Requirements
Power Output
Microwave 100%
External Dimensions
Internal Dimensions
Model Number
750
1000
1400
1800
MD 075045CUK
MD1000C45UK
MD1000C25EX
MD1400C45UK
MD1400C25EX
MD1800C45UK
MD1800C25EX
MD0750
MD1000
MD1400
MD1800
Height
Width
Depth
Height
Width
Depth
Capacity
2 = 220-230V a.c.
4 = 230-240V a.c
230-240V ac 50 Hz 13.0A Single Phase 2 Wire + Earth
230-240V ac 50 Hz 13.0A Single Phase 2 Wire + Earth
220-230V ac 50 Hz 14.2A Single Phase 2 Wire + Earth
230-240V ac 50 Hz 13.0A Single Phase 2 Wire + Earth
220-230V ac 50 Hz 14.2A Single Phase 2 Wire + Earth
230-240V ac 50 Hz 13.0A Single Phase 2 Wire + Earth
220-230V ac 50 Hz 14.2A Single Phase 2 Wire + Earth
750W ( IEC 705 )
1000W ( IEC 705 )
1400W ( IEC 705 )
1800W ( IEC 705 )
335mm ( Plus 50mm minimum clearance above )
510mm ( Plus 50mm minimum clearance each side )
415mm ( Plus 50mm clearance behind )
210mm
330mm
330mm
23 litres (0.81 ft³)
5 = 50 Hz
6 = 60 Hz
UK
EX = export
Weight
Construction
Settings
Nett
Gross packed
Cavity & Casework 304 Stainless Steel
Microwave
Timer
30kg
35kg
100%, 75%, 50%, progressive Defrost
Up to 9 minutes 59 seconds
Up to 3 cooking stages of up to 9 minutes 59 seconds each
(Programmed)
Control System Wipe-clean touch pad operating microprocessor based control system.
Direct readout of time and power set.
10 Pre-programmed cooking sequences accessed by just two key
presses.
Safety Features Four door interlock switches.
Cavity Overheat Sensor.
Magnetron Overheat Sensor.
Additional Features
• Easy-to-use multistage programming.
• Manual and Pre-programmed mode always available
• Magnetron soft-start circuit for increased life and faster activation.
• Multiple product facility.
Page 4 MD Series Ovens 32Z3329 Issue 6
Installation instructions
Power Supply Requirements
The oven should be connected to a suitable electricity supply, which can cope with the switchingon 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.
The supply for the oven should be fitted with a Type "C" circuit breaker, rated at 16A.
Positioning the Oven
In order to maintain adequate ventilation for air intake and exhaust, and to allow access for
cleaning filters, you must allow a minimum of 50mm clearance all around the oven. Air intake
temperature should not exceed 35°C - excessive temperature can lead to reduced operating duty
cycle or premature ageing of internal components.
ALWAYS Place containers in the cavity carefully - impact damage may chip the oven shelf
NEVER Install an oven above fryers, grills, griddles or any other major heat source
NEVER Stack machines on top of each other without using the stacking adapter provided
stacking adapter
maximum
3 ovens
in a stack
Page 5 MD Series Ovens 32Z3329 Issue 6
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.
1
1
Door not fully shut
2
Possible electrical fault
No time has been set
2
Invalid time has been set.
3
Invalid program has been
set
4
Memory failure running a
Program
Close door fully
Check microswitch door circuit
Check microswitch connection
to PCB
Check ribbon cable
Check relay PCB & logic PCB
Set a time
Set a valid time
Use call-back to check program
Re-Program Pad,
if fault repeats replace logic
PCB
Page 6 MD Series Ovens 32Z3329 Issue 6
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.
Note: This test can only be carried out on a COLD oven. If the oven has been operating, even for
only a few seconds, the power given will be lower than the oven rating. This test must also be
carried out at a stable voltage - the voltage in most kitchens varies considerably even within the
period of the test. If the oven has been operating, go to Procedure B.
You will need:
A thermometer capable of reading to ±0.1°C.
A cylindrical borosilicate glass container, 190mm diameter, with a wall thickness of
3mm or less.
A calculator.
A set of scales capable of reading 1kg to an accuracy of ± 1g.
A glass or plastic stirrer.
A jug capable of holding over 1 litre of water.
Drinkable water which is at a temperature of 10°C ± 1°C.
A “Variac” or similar variable transformer capable of supplying the oven to ensure
a stable voltage.
WARNING: The Borosilicate Glass container has thin walls and is therefore fragile
- take care not to break it during use.
Method
A cylindrical container of borosilicate glass is used for the test. It has a maximum thickness of
3mm, an external diameter of approximately 190mm and a height of approximately 90mm. The
mass of the container is determined.
At the start of the test, the oven and the empty container are at ambient temperature. Potable water
having an initial temperature of 10°C ± 1°C is used for the test. The temperature of the water is
measured immediately before it is poured into the container.
A quantity of 1000g ± 5g of water is added to the container and its actual mass obtained. The
container is then immediately placed in the middle of the oven shelf which is in its lowest normal
position. The appliance is supplied at rated voltage and operated at the maximum power setting.
The time for the water temperature to attain 20°C ± 2°C is measured. The oven is then switched off
and the final water temperature is measured within 60seconds.
NOTES:
1 The water is stirred before its temperature is measured.
2 Stirring and measuring devices are to have a low heat capacity.
The microwave power output is calculated from the formula:
P =
where
P is the microwave power output, in watts;
M
is the mass of the water, in grams;
W
M
is the mass of the container, in grams;
C
T
is the ambient temperature, in °C;
0
T
is the initial temperature of the water, in °C;
1
T
is the final temperature of the water, in °C;
2
t is the heating time in seconds, excluding the magnetron filament heat-up time.
4.187 MW (T2-T1) + 0.55 MC (T2-T0)
t
Page 7 MD Series Ovens 32Z3329 Issue 6
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].
3 Place the tray in the oven and close the door.
4 Turn the oven on.
5 Set the timer to 1:02.
6 Press the “100%” pad.
7 When the oven bleeps, open the door and remove the tray.
8 Stir the water thoroughly, and measure its temperature. Record this as T[e].
Calculation:
1 T[r] = T[e] - T[s].
2 Power = 78.5 x T[r]. Power is in Watts.
The power given by the above test should be within ±15% of the rated power.
Procedure C - Power Transformer Test
You will need:
A Digital Multi-meter (D.M.M.)
A Megger or similar resistance meter using 500V d.c.
1 Isolate the oven from the mains supply.
WARNING: High voltages and large currents are present at the secondary winding and filament
winding of the Power Transformer. 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.
WARNING: Even when the oven is not cooking, the Power Transformer has High Voltages present
because of the Soft Start circuit. Isolate the oven before testing.
2. Ensure that the High Voltage Capacitor is discharged before commencing work.
3. Remove all connections from the Power Transformer.
4. Using a D.M.M., check the continuity of the windings. Results should be as follows:
Mains winding between tags P & P
High Voltage winding
(between tag S & chassis)
Filament winding
between terminals F & F
Approx. 1.3 Ω
Approx. 82 Ω
Less than 1 Ω
5. Using a Megger, test the insulation resistance between:
Primary winding P and chassis
Filament winding F and chassis
One end of the High Voltage winding is connected to the chassis, so this is not tested.
Pass if over 10 MΩ
Pass if over 10 MΩ
Page 8 MD Series Ovens 32Z3329 Issue 6
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 .
WARNING: Even when the oven is not cooking, the High Voltage Capacitor has High Voltages
present because of the Soft Start circuit. Isolate the oven before testing.
1. Isolate the oven from the mains supply.
2. Ensure that the High Voltage Capacitor is discharged before
commencing work.
3. Remove all connections from the High Voltage Capacitor.
4. Using a D.M.M., check for continuity between the terminals &
compare results with table.
Between Terminals
Between Terminals and Case Pass if open circuit
5. Using a Megger, test the insulation resistance between the
terminals and the case.
Between Terminals and Case
Procedure E - High Voltage Rectifier Test
You will need:
A Megger or similar resistance meter using 500V d.c.
WARNING: High voltages and large currents are present at the High Voltage Rectifier. It is very
dangerous to work near this part when the oven is on. NEVER make any voltage
WARNING: Even when the oven is not cooking, the High Voltage Rectifier has High Voltages
1. Isolate the oven from the mains supply.
2. Ensure that the High Voltage Capacitor is
discharged before commencing work.
3. Remove all connections from the High Voltage
Rectifier.
4. Using the Megger, test for continuity in both
directions. Compare results with the table.
measurements at the High Voltage circuits, including the magnetron filament .
present because of the Soft Start circuit. Isolate the oven before testing.
Pass if approximately 10 MΩ
Pass if over 100 MΩ
Open Circuit both ways
Conducts one way only
Short Circuit both ways
Conducts one way, leaks the other
FAIL
PASS
FAIL
FAIL
Procedure F - Magnetron Test
You will need:
A Megger or similar resistance meter using 500V d.c.
A Magnetron can be tested for an open filament or a short circuit
by carrying out a continuity check.
1. Isolate the oven from the mains supply.
2. Ensure that the High Voltage Capacitor is discharged before
commencing work.
3. Remove all connections from the Magnetron.
4. A continuity check across the Filament terminals should be 1ohm or less
5. A continuity check between each filament terminal and the
metal outer should read open.
Page 9 MD Series Ovens 32Z3329 Issue 6
Exploded view :
65
97
94
94
Door interlock details for Models
before January 2007,
MD1000, MD1400 & MD1800
See APPENDIX 2
96
MD1800 [January 2007]
95
98
94
Note: Models MD0750 & MD1000 have one Magnetron Assembly only ( Parts 51 & 61 )
Model Part
59 MD0750 (Tesco) HV Capacitor 0.74µF 30M0098
HV Capacitor 1.0µF 30M0059
51
MD0750 (Tesco)
61
MD1000
1 Magnetron only
Page 10 MD Series Ovens 32Z3329 Issue 6
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.
14
80
16
14
5
6
4
3
1
5
Door Handle
Models before January 2007,
MD1000, MD1400 & MD1800
No Description MD1000,
1 Outer Handle 30M0001
2 Handle Bearing (4) 30M0002
3 Inner Handle 30M0003
4 Door Outer Skin 30M0004
5 Glass Locator 30M0005
6 Outer Door Glass 30M0006
7 Door Body 30M0007
8 Door Catch Bracket 30M0008
9 Door Catch (2) 30M0009
10 Door Catch Link Rod 30M0010
11 Door Spring 30M0011
13 Door Catch Crank 30M0013
14 Upper / Lower Hinge Plate 30M0014
15 Inner Door Film 30M0015
16 Choke Cover 30M0016
80 Door Assembly 11M0334
15
9
11
9
13
8
7
MD1400, MD1800
10
MD1800
From Jan 2007
30M4002
——-
30M4003
30M0004
30M0005
30M0006
30M0007
30M0008
30M4009
30M0010
30M4011
30M0013
30M0014
30M0015
30M0016
11M4334
Page 11 MD Series Ovens 32Z3329 Issue 6
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
1. Remove four screws holding the Upper and Lower Hinge Plate [14] to the oven cavity.
2. Remove Door Assembly [80] by pulling it forward.
3. On re-installing new door assembly, secure the upper and lower oven hinges with the
four mounting screws to the oven cavity.
4. Make sure the door is parallel with the bottom line of the oven cavity face and the
catches pass through the catch holes correctly. See door adjustment.
DOOR ADJUSTMENT
When removing and/or loosening hinges during door adjustment or replacement, the following
adjustment criteria must be met. The door is adjusted to meet the following three conditions by
keeping the hinge screws slack.
1. Adjust door interlock block to a position where it smoothly locates with the catches
through the catch holes.
2. Deviation of door alignment from horizontal line of cavity front is to be less than 1.0mm.
3. The door is positioned so that it touches the cavity front.
Reinstall outer case and check for microwave leakage around the door with an approved
microwave leakage meter
Page 12 MD Series Ovens 32Z3329 Issue 6
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.
2. Lift up the Choke Cover.
DOOR COMPONENTS REMOVAL
Place the Door Assembly [80] on a soft cloth with the Choke Cover [16] facing up.
UPPER AND LOWER OVEN HINGE REMOVAL
1. Remove the Choke Cover, referring to "CHOKE COVER REMOVAL".
2. Release the Door Hinges [14] from the door panel.
DOOR HANDLE REMOVAL
1. Remove the two screws holding the Door Handle [1] to door.
2. Remove the Door Handle from the Door Body.
UPPER AND LOWER DOOR CATCH REMOVAL
1. Remove the Inner Handle [3] from the door assembly.
2. Remove the three screws holding the Door Catch Bracket [8] to the Door Body.
3. Release the Door Spring [11] from the tab of the Door Catch Link Rod [10] and Door
Catch Bracket.
4. Release the Catches [9] from Door Catch Link Rod and Door Catch Bracket.
DOOR OUTER SKIN REMOVAL
1. Set the four tabs of the Door Outer Skin [4] upright.
2. Remove the Door Outer Skin from the Door Body [7].
DOOR GLASS REMOVAL
1. Remove the four screws holding the two Glass Locators [5] to the Door Body [7].
Page 13 MD Series Ovens 32Z3329 Issue 6
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
66d
L
Power In Power Out
N
The switches operate as follows:
1. Monitor Switch [66b , Top ]. As the door is closed, the monitor switch is opened.
2. Primary Interlock Switch [ 66a , Lower Middle ]. The Primary switch is then closed.
3. Secondary Interlock Switch [ 66c , Upper Middle ]. The Secondary Switch then closes.
4. Low voltage Switch [ 66d , Bottom ]. The Low voltage switch operates concurrently with
the Primary and Secondary switches.
When the door is opened, the switches operate in the reverse order.
66a
66c
66b
Page 14 MD Series Ovens 32Z3329 Issue 6
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.
5. When the panel has been tested, re-
assemble and re-test the control housing.
Page 15 MD Series Ovens 32Z3329 Issue 6
Input wiring details
Green/Yellow
Blue
26 Mains Cable Assy 31Z0220
35 Strain Relief Bush 31Z1036
60 Rear Panel 30M0060
67 Fuse Cover 20Z1080
74 16A Mains Filter 30Z0997
75 Fuse Holder 30Z0231
76 Fuse 13A Anti surge 30Z0168
Brown
Page 16 MD Series Ovens 32Z3329 Issue 6
Part number identification chart 1
No Description MD1400 MD1800
Outer Handle 30M0001 30M0001 30M0001 30M4002
1
Handle Bearing (4) 30M0002 30M0002 30M0002 30M0002
2
Inner Handle 30M0003 30M0003 30M0003 30M4003
3
Door Outer Skin 30M0004 30M0004 30M0004 30M0004
4
Glass Locator 30M0005 30M0005 30M0005 30M0005
5
Outer Door Glass 30M0006 30M0006 30M0006 30M0006
6
Door Body 30M0007 30M0007 30M0007 30M0007
7
Door Catch Bracket 30M0008 30M0008 30M0008 30M0008
8
Door Catch (2)// Catch hook 30M0009 30M0009 30M0009 30M4009
9
Door Catch Link Rod 30M0010 30M0010 30M0010 30M0010
10
Door Spring 30M0011 30M0011 30M0011 30M4011
11
Oven Cavity 30M0012 30M0036 30M0036 30M0036
12
Door Catch Crank 30M0013 30M0013 30M0013 30M0013
13
Upper / Lower Hinge Plate 30M0014 30M0014 30M0014 30M0014
14
Inner Door Film 30M0015 30M0015 30M0015 30M0015
15
Choke Cover 30M0016 30M0016 30M0016 30M0016
16
Control Panel Cover ( see note 1) 30M0017 30M0017 30M0017 30M0017
17
Membrane Blue 11M0384 11M0384 11M0384 11M0384
18
Display Screen 30M0019 30M0019 30M0019 30M0019
19
Control Housing Moulding 30M0020 30M0020 30M0020 30M0020
20
Logic PCB Assy 11M0326 11M0326 11M0326 11M0326
21
Housing Support Bracket 30M0022 30M0022 30M0022 30M0022
22
Relay PCB Assy 11M0327 11M0327 11M0327 11M0327
23
10 Way Ribbon Cable Assy 11E0081 11E0081 11E0081 11E0081
24
Insulating Sheet 30M0025 30M0025 30M0025 30M0025
25
Mains Cable Assy 31Z0220 31Z0220 31Z0220 31Z0220
26
Mica Plate and Stirrer Assembly 30M0027 30M0027 30M0027 30M0027
27
28
Decorative Trim LH 30M0029 30M0029 30M0029 30M0029
29
Decorative Trim Top 30M0030 30M0030 30M0030 30M0030
30
Air Inlet Filter 30M0031 30M0031 30M0031 30M0031
31
Chassis 30M0032 30M0032 30M0032 30M0032
32
HV Transformer J1342 30M0035 ———— ———— ————
33
HV Transformer J1338 ———— 30M0033 30M0033 30M0033
Decorative Trim RH 30M0034 30M0034 30M0034 30M0034
34
Strain Relief Bush 31Z1036 31Z1036 31Z1036 31Z1036
35
Lamp Cover Film 30M0037 30M0037 30M0037 30M0037
37
Lamp 30M0038 30M0038 30M0038 30M0038
38
Lamp Holder 30M0039 30M0039 30M0039 30M0039
39
Lamp Bracket 30M0040 30M0040 30M0040 30M0040
40
Air Outlet Duct 30M0041 30M0041 30M0041 30M0041
41
Temp Sensor 30M0042 30M0042 30M0042 30M0042
42
Thermal Fuse 30M0043 30M0043 30M0043 30M0043
43
MD1000
Pre Jan 2007
Part No. Part No. Part No. Part No.
MD1800
From Jan 2007
Note 1. Part 17 supplied as MD 1800, remove label for MD1000 & MD1400
Page 17 MD Series Ovens 32Z3329 Issue 6
Part number identification chart:
No Description MD1400 MD1800
Lamp Cover 30M0044 30M0044 30M0044 30M0044
44
45
46
47
48
49
51
52
56
57
58
60
61
62
63
64
65
66a-d
67
68
69
70
71
72
73
74
75
76
78
79
80
82
83
84
91
92
93
94
95
96
97
98
*Note: Model 0750 (Tesco) uses: HV Capacitor 0.74µF 30M0098 & HV Capacitor 1.0µF 30M0059
Back Case 30M0045 30M0045 30M0045 30M0045
Rear Air Guide 30M0046 30M0046 30M0046 30M0046
Upper Air Duct 30M0047 30M0047 30M0047 30M0047
Cooling Fan Assembly 30M0048 30M0048 30M0048 30M0048
Gold Resistor 30Z0235 30Z0235 30Z0235 30Z0235
Magnetron Thermostat 30M0051 30M0051 30M0051 30M0051
10A Fuse In-line Assembly 11M0330 11M0330 11M0330 11M0330
Fan Scroll 30M0056 30M0056 30M0056 30M0056
Main Capacitor Bracket 30M0057 30M0057 30M0057 30M0057
Capacitor Clamp 30M0058 30M0058 30M0058 30M0058
HV Capacitor 0.74µF ———— 30Z1329 ———— ————
HV Capacitor 0.88µF ———— 30Z1075 ———— ————
59*
HV Capacitor 1.0µF 30M0059 ———— 30M0059 30M0059
HV Capacitor 1.1µF ———— ———— 30Z1242 30Z1242
Rear Panel 30M0060 30M0060 30M0060 30M0060
Magnetron 30M0061 30M0061 30M0061 30M0061
Magnetron Air Splitter 30M0062 30M0062 30M0062 30M0062
Magnetron Cooling Duct 30M0063 30M0063 30M0063 30M0063
Cooling Duct Cover 30M0064 30M0064 30M0064 30M0064
Interlock Holder/ switch holder 30M0065 30M0065 30M0065 30M4065
Microswitch V5S010CB (4) 30Z1176 30Z1176 30Z1176 ————
Fuse Cover 20Z1080 20Z1080 20Z1080 20Z1080
Spring 1 30M0068 30M0068 30M0068 30M4066
Spring 2 30M0069 30M0069 30M0069 30M0069
Top Lever 30M0070 30M0070 30M0070 30M0070
Middle Lever/ Up lever 30M0071 30M0071 30M0071 30M4071
Bottom Lever/ Lower lever 30M0072 30M0072 30M0072 30M4072
Filter Bracket 40M0961 40M0961 40M0961 40M0961
16A Mains Filter 30Z0997 30Z0997 30Z0997 30Z0997
Fuse Holder 30Z0231 30Z0231 30Z0231 30Z0231
Fuse 13A Anti surge 30Z0168 30Z0168 30Z0168 30Z0168
HV Diode Assy 30M0078 30M0078 30M0078 30M0078
Self-Adhesive Foot 30M0079 30M0079 30M0079 30M0079
Door Assembly 11M0334 11M0334 11M0334 11M4334
Oven Shelf 30M0082 30M0082 30M0082 30M0082
HT Lead 1 30M0083 30M0083 30M0083 30M0083
HT Lead 2 ———— 30M0084 30M0084 30M0084
Mains Filter Bracket 40M0961 40M0961 40M0961 40M0961
Filter Shell Clip 30M0092 30M0092 30M0092 30M0092
Filter OIN Clip 30M0093 30M0093 30M0093 30M0093
Microswitch ———— ———— ———— 30M4073
Microswitch ———— ———— ———— 30M4072
Spring ———— ———— ———— 30M4066
Top lever ———— ———— ———— 30M4071
Lower lever ———— ———— ———— 30M4072
MD1000
Pre Jan 2007
Part No. Part No. Part No. Part No.
MD1800
From Jan
Page 18 MD Series Ovens 32Z3329 Issue 6
Circuit diagram:
Page 19 MD Series Ovens 32Z3329 Issue 6
APPENDIX 1: Cleaning procedure
For the oven to operate at peak efficiency, the cavity, door and the air filter must be
kept clean.
A daily cleaning routine will ensure that you comply with the required hygiene standards
and will help to maintain and prolong the efficiency of your oven.
Follow the SAFETY INSTRUCTIONS at the beginning of this manual.
• ALWAYS switch off at the electrical supply.
• As required, wipe out spillage's with disposable
paper wipes
• NEVER use steel wool, knives or harsh abrasives on
any part of the oven
As with all electrical appliances, it is wise to have the
electrical connections inspected periodically.
Cleaning the Air Filter
1. Remove the air filter from along the lower edge of the
oven.
2. Wash in clean, warm soapy water, rinse and pat dry.
Put the filter back into position.
Cleaning the oven cavity and door
1. Wipe down the sides and floor of the cavity with a damp
cloth.
2. Gently wipe the ceiling. Take care not to press upwards
as this could damage the stirrer cover.
Faults arising from neglect
or misuse including use
without clean filters in place
are not covered by the
guarantee. Service visits as
a result of such faults will be
chargeable.
DO NOT USE THE OVEN
WITHOUT A CLEAN AIR
FILTER IN POSITION
Cleaning the control panel and exterior surfaces
Wipe down regularly with a damp cloth.
Hints and Tips for stubborn stains in the oven cavity
1. Place a container of water (1.5 litres) into the centre of
the oven cavity.
2. Set timer to 9 minutes.
3. Set microwave power to 100%.
4. At end of steam cycle wipe out cavity with a clean cloth.
Replacing the Light Bulb
WARNING: Disconnect the oven from the electrical
supply before removing the light bulb cover
1 Undo screw on panel on side of the oven and remove
panel
2 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.
Page 20 MD Series Ovens 32Z3329 Issue 6
APPENDIX 2: Door interlock details
Models before January 2007, MD1000, MD1400 & MD1800
No Description Part No.
1 Outer Handle 30M0001
3 Inner Handle 30M0003
9 Door Catch (2) 30M0009
10 Door Catch Link Rod 30M0010
11 Door Spring 30M0011
13 Door Catch Crank 30M0013
65 Interlock/ Switch Holder 30M0065
66 a-d Microswitch V5S010CB 30Z1176
67 Fuse Cover 20Z1080
68 Spring 1 30M0068
69 Spring 2 30M0069
70 Top Lever 30M0070
71 Middle Lever 30M0071
72 Bottom Lever 30M0072
Page 21 MD Series Ovens 32Z3329 Issue 6
Manual corrections and modifications
Whilst every effort has been made to ensure that the information contained in this manual is accurate
and complete, if you believe that an error has been made, or if you have any suggestions for how the
manual could be improved, please fill in and return this form. A review of any forms returned will be
made on a regular basis, and the manual will be updated if required.
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
Page 22 MD Series Ovens 32Z3329 Issue 6
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