Merrychef Mealstream 400 Service Manual

Page 1 400 Series Ovens 32Z3769 Issue 1

CAUTION MICROWAVE EMISSIONS

DO NOT BECOME EXPOSED TO EMISSIONS FROM THE MICROWAVE

GENERATOR OR PARTS CONDUCTING MICROWAVE ENERGY

SERVICE MANUAL

Mealstream 400

SERVICE MANUAL

For all 400 Series models manufactured from February 2009

Part No. 32Z3769 Issue No. 1

SERIES

Merr ychef

Page 2 400 Series Ovens 32Z3769 Issue 1

Merrychef Limited,
Station Road West,
Ash Vale, Aldershot
Hampshire GU12 5XA
United Kingdom

Tel: [phone] Fax: [phone]
Internet address: http://www.merrychef.com

E-mail: [e-mail] or [e-mail]

Table of Contents

Safety Code ...................................................................................................3

Product Specifications ................................................................................... 4

Installation Instructions ..................................................................................5

Electrical Installation ......................................................................................6

Error Codes and Diagnostics.........................................................................7

Main Features................................................................................................8

Electronic Controls.........................................................................................9

Power Output Testing to EN 60335-2-90.....................................................10

Power Transformer Test ..............................................................................10

High Voltage Capacitor Test........................................................................11

High Voltage Rectifier Test ..........................................................................11

Magnetron Test............................................................................................11

Door Interlock Operation........................................................................ 12-14

Casework.....................................................................................................15

Door Mechanism..........................................................................................16

Oven Cavity Components & Hot Air System ...............................................17

Oven Door Assembly ...................................................................................18

Door Interlock RHS, Magnetron & Stirrer motor ..........................................19

Principal components LHS & Rear View .....................................................20

Principal components RHS 1: Models _EE5, _XE5 [CD2] ..........................21

Principal components RHS 2: Models _EE5, _XE5 [CD2] ..........................22

Principal components RHS 3: Models _XX5, _XX52...................................23

Input Wiring, Filters and Fuses 1 .................................................................24

Input Wiring, Filters and Fuses 2 .................................................................25

Control Panel 1: Electronic Controls............................................................26

Control Panel 2: Membrane Panel circuit ....................................................27

Control Panel 3: Manual Control assembly .................................................28

Part No. Identification ........................................................................... 29-30

Appendix 1 MenuKey Download Procedure ................................................31

Appendix 2 Cleaning Procedure ..................................................................32

Recommended Parts List (Spares)........................................................34334

Circuit Diagrams .................................................................................... 35-38

Merrychef and MenuKey™ are registered Trademarks of Merrychef Ltd.

For Service contact:

Page 3 400 Series Ovens 32Z3769 Issue 1

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 Mealstream 400 range of Combination 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 On/Off switch on the oven is not adequate protection against electric shock, as it does

not isolate all of the internal wiring from the Electrical Supply.

Upon completion of a service on a Mealstream 401/403 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, and the arms run freely in the slots.

• The door activates all four of the door interlock switches in the correct order.

• All fuse-holder safety covers are correctly fitted.

• The temperature sensor is correctly connected to the Power PCB.

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 turntable is rotating correctly.

• The power output of the oven is correct (see pages 12 & 13 ).

• Microwave emission is below permissible limit - 5 mW/cm² (see BS EN 60335-2-90).

• Oven has correct 50mm air gap all round and 150mm above.

Air flow should not be restricted.

SAFETY CODE

Page 4 400 Series Ovens 32Z3769 Issue 1

Power
Requirements

See RATING PLATE on rear of oven

Power Output
(IEC 705)

Microwave 100%
Convection
Combination

700W (_EE, _XE)
3000W (_XX5 )
700W + 1500W ( _EE )
700W + 3000W ( _XE )
1000W + 3000W ( _XX5 )

External
Dimensions

Height
Width
Depth

530 mm (Plus 150 mm minimum clearance above)
550 mm (Plus 50 mm minimum clearance each side)
575 mm (Plus 50 mm clearance behind)

Internal
Dimensions

Height
Width
Depth
Turntable
Capacity

315 mm
330 mm
330 mm
300 mm Diameter

34.3 litres

Weight Nett

Gross packed

All models except XX5 45kg, XX5 55kg
All models except XX5 58kg, XX5 68kg

Construction Cavity

Casework

Stainless Steel
304 Stainless Steel
Anodised Aluminium Extrusions

Settings Microwave

Temperature
Timer

100%,75%,50%,25%, Convection only
Off, 175°C, 200°C, 225°C, 250°C, 275°C
Up to 30 minutes

Up to 3 cooking stages of up to 30 minutes each
(Programmed)

Model No.: 1003 + Voltage + Frequency + Current + Controls

Model
prefix

Voltage

Frequency

Current Control

Type

2 = 220-230V a.c.
4 = 230-240V a.c.

5 = 50 Hz
6 = 60 Hz

EE = 13A 5 =

Series 5

controls

1003

XE = 30A
XX = 30A

Supply

Phase

2=

Twin

Phase

MenuKey

MK

Catalytic

converter*

C

ELECTRONIC CONTROLS: ( EC401 & EC403 models )

Model No.: 1003 + Voltage + Frequency + Current

Model prefix Voltage Frequency Current

1003

2 = 220-230V a.c.
4 = 230-240V a.c.

5 = 50 Hz
6 = 60 Hz

CD2 = 13amp
XD2 = 30amp

MANUAL CONTROLS ( CD & XD models )

For example: 100345XE52MK

230-240V, 50Hz, 30A, Series 5 Controls, Twin Phase, MenuKey

Product specifications: Mealstream 401 & 403 models

+ Phase + MenuKey + Catalytic converter

* A Catalytic converter is fitted to Mealstream 403 models only

Page 5 400 Series Ovens 32Z3769 Issue 1

Positioning the Oven

In order to maintain adequate ventilation for air intake and exhaust, and to allow access for
cleaning the air filters, you must allow a minimum of 50mm(2 inches) clearance at the sides
and rear of the oven, and at least 150mm above.
Air intake temperature should not exceed 35°C (95°F).
Excessive temperature will lead to reduced operating duty cycle or premature ageing of
internal components.

NEVER Install an oven above fryers, grills, griddles or any other major heat source.
NEVER Stack machines on top of each other - always use a double stand.
ALWAYS Place containers in the cavity carefully - impact damage may chip the

vitreous enamel coating.

Installation instructions

Page 6 400 Series Ovens 32Z3769 Issue 1

Models 1003__XE52, 1003__XX52

WARNING

All models ( 30A ) must be connected to a separate electrical supply rated at
30 Amps by a qualified and approved electrician. A suitable 30 amp rated
isolating switch with a 3mm contact gap on both poles should be fitted for each
oven installed.

Establishments with standard ( Type ‘B’ ) circuit breakers are sensitive to ‘surges’ which occur
on switching on freezers, refrigerators and other catering equipment, including microwave
ovens. Because of this, we strongly recommend that a separate Type ‘C’ circuit breaker
( designed specifically for this type of equipment ) must be fitted. An individual, suitably rated
circuit breaker should be fitted for each oven installed.

TWIN PHASE

The Mealstream 401 oven Twin Phase models
should be connected as shown in Diagram 2.
The Circuit Breaker should be rated at 20A per phase
(TypeC).

Electrical installation:

WARNING: This appliance must be earthed.

Failure to do so may result in electric shock and death

Where an approved and fitted moulded plug is
supplied we strongly recommend that this plug is
never removed.
However certain establishments may require a
different plug to be fitted. In this case, the wiring
instructions shown should be observed.

Models 1003__EE5, 1003__CD2
The power outlet used must be individually fused. It
is essential that the socket is properly installed and
earthed. It should be fed from a circuit which is
suitable for high power electrical appliances and it is
important that this circuit is not overloaded.

Models 1003__XE5, 1003__XD, 1003__XX5
When supplied, single phase models are fitted with a
Blue 32Amp Plug approved to BS4343. Wiring cable
colours as shown in Diagram 1

The Circuit Breaker should be rated at 45A (TypeC).

Diagram 1

Diagram 2

Simplified loading Diagram

Page 7 400 Series Ovens 32Z3769 Issue 1

Error codes and diagnostics

Electronic Control Models
The control panel will identify some of the most common problems by flashing an error
message code in the time display window.

Error Message

Possible Cause Service

1

2

Door not fully shut

Possible electrical fault

Close door fully.

Check Microswitch Door Circuit
Check Microswitch Connection to PCB
Check Ribbon Cable
Check Relay PCB & Logic PCB

1
2
3
4

5

No time has been set
Invalid time has been set
Invalid program has been set
Number pad failure

Memory Failure running a Program

Set a time
Set a valid time
Use call-back to check program
(Menukey: no key downloaded)
Membrane key short circuit
Re-Program Pad,
if fault repeats replace Logic PCB

1 Oven is not at correct temperature

to start program

Allow oven to reach correct
Programmed temperature

1 MenuKey removed before the

download is complete
or the process has been
interrupted

Switch oven off and begin the MenuKey
download again

1 Magnetron overheated Air inlet on rear of machine being obstructed.

High air inlet temperature.
Slow running cooling fan, jammed turntable or
broken gearbox
(cooling fan also drives turntable _XE5 models)
Faulty magnetron overheat ‘stat or associated
wiring.

1 Jumper installed incorrectly on

PCB logic board

Check Jumper position

1

2

Magnetron has overheated but
has now recovered
Internal diagnostic fault

Check that magnetron cooling fan and turntable
are working correctly
Check installation, air inlet temperature and air

filters

1 Oven control area is overheating Check air filters.

Check axial fan
Check installation for hot air intake

EPS= External Program System

Error Light Operation

The “Air Filter Blocked” light and “Service” light are triggered by the internal circuitry. If the magnetron
overheats, the error code “E:7” or “E:8” is displayed on the front panel, and both the “Air Filter Blocked”
and the “Service” indicators will light. Once the magnetron has cooled sufficiently to allow the oven to
restart, the “Service” light will remain illuminated until the oven is turned off.

This fault may have been triggered by one of the following causes:

- Air inlet on rear of machine being obstructed.

- High air inlet temperature.

- Slow running cooling fan, jammed turntable or broken gearbox
(note: cooling fan also drives turntable on EE5, CD2 and XE5 models).

- Faulty magnetron overheat ‘stat or associated wiring.

Note that the customer may not have noticed that the oven displayed “E:7” or “E:8”, and so the
reported fault may be misleading.

[Service]

[Air Filter blocked]

Page 8 400 Series Ovens 32Z3769 Issue 1

b VENTS

c TRAY HANDLE RESTS

There is one on each side of the oven for
convenient storage of the tray handle.

d BAFFLE PLATE

Forms the inside rear of the oven and covers the
hot air circulation fan. Removable for cleaning by
unscrewing the four wing nuts which hold it in
place. This must be cleaned on a regular basis,
and kept free of debris.

CATALYTIC CONVERTOR

Allows extraction free cooking. Should be
removed regularly for cleaning. ( Do not spray/
put caustic cleaner directly into the catalytic
converter as this will cause permanent damage )

e RUNNERS

These mounted on each side of the oven cavity
to support the rectangular racks or oven trays,
and are for use in CONVECTION MODE ONLY.

f HOT AIR FAN

Situated behind the baffle plate, and circulates
the hot air through the baffle plate, over the
heating element, and around the edge of the
baffle plate back into the cavity.

g OVEN CAVITY

The oven cavity is stainless steel. It must be kept
clean See CLEANING.

h TURNTABLE TRAY

The vitreous enamelled turntable tray fits onto the
turntable disc in the bottom of the oven cavity,
and rotates during cooking to ensure an even
distribution of microwave energy so that the food
is cooked evenly.

j RATING PLATE

The rating plate is situated on the rear of the
oven, and states the Model, Serial Number,
Electrical Ratings and Manufacturers Tel no.

k DOOR

The door consists of a thermally insulated inner
section, and an additional air gap provided by a
twin skinned door front to lower the surface
temperature.

l ON/OFF SWITCH

This is used to turn the oven On or Off.
IT DOES NOT ISOLATE INTERNAL WIRING
FROM THE ELECTRICAL SUPPLY.

n ELECTRICAL SUPPLY LEAD

p AIR FILTER

Main intake for cooling air for internal
components. Must be clear of obstructions.

q MenuKey

Main features

b

c

d

e

f

g

h

j

k

l

m

p

n

q

rear view of Oven

Page 9 400 Series Ovens 32Z3769 Issue 1

Electronic controls:

a Stage LED's

b Service Indicator

c Air Filter Block Indicator

e Program Display

f Temperature Set Pads

g Time / Program Number Pads

h Cancel/ Callback Pad

i Program Pad

j Convection Pad

k Microwave power Pads

l On/Off switch

m MenuKey socket

i

j

a

b

c

e

f

g

h

k

l

m

Page 10 400 Series Ovens 32Z3769 Issue 1

Procedure B - Simplified Power Output Test for Field Service Use

You will need:

A thermometer capable of reading to ±0.1°C.
A Polypropylene tray approximately 200 mm x 200 mm.
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 on the turntable in the oven and close the door.
4 Turn the oven on.
5 Set the timer to 1:02. ( For Manual controls use a stopwatch set to 1 minute 2 seconds )
6 Press the “100%” power 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 = 70 x T[r]. Power is in Watts.

The power given by the above test should be within ±10% 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 Po wer Transformer has High Voltages presen t

because of the Soft Start circuit. Isolate the oven before testing.

a Mains winding between tags

Approx. 1.3 Ω

b High Voltage winding

Approx. 50-100 Ω

c Filament winding

between terminals

Less than 1 Ω

Primary winding and chassis

Pass if over 10 MΩ

Filament winding and chassis

Pass if over 10 MΩ

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:

5 Using a Megger, test the insulation resistance between:

One end of the High Voltage winding is connected to the

chassis, so this is not tested.

a

c

b

Procedure A - Power Output Test In accordance
with BS EN 60335-2-90 is not used in the field please

Engineers Procedure B.

Page 11 400 Series Ovens 32Z3769 Issue 1

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
measurements at the High Voltage circuits, including the magnetron filament .

WARNING: Even when the oven is not cooking, the High Voltage Rectifier has High Voltages

present because of the Soft Start circuit. Isolate the oven before testing.

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.

5. Using a Megger, test the insulation resistance between the
terminals and the case.

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 &

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.

Between Terminals

Pass if approximately 10 MΩ

Between Terminals and Case Pass if open circuit

Between Terminals and Case

Pass if over 100 MΩ

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.

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.

Open Circuit both ways

FAIL

Conducts one way only

PASS

Short Circuit both ways

FAIL

Conducts one way, leaks the other

FAIL

Page 12 400 Series Ovens 32Z3769 Issue 1

SW2 Primary Interlock— located on the left hand side of the oven. Directly disconnects

the supply to the microwave generating circuit and thereby cuts off the microwave emissions
from the oven when the door is opened.

SW1 Monitored switch—located on the same assembly as the primary. The Monitor

switch will produce a short circuit across the mains supply if the Primary interlock switch is
faulty, thus blowing the microwave fuse and rendering the oven inoperative.

SW3 The Secondary interlock—located on the left hand side of the oven and like the

primary switch will cut off the microwave emission and will do so even if the primary and
monitored interlock have failed open circuit.

Note: If operation of the Monitor switch has caused the Microwave Fuse to blow, the

Primary and Monitor microswitches must be changed, as they may have been
damaged by the high short-circuit currents involved.

SW4 Convection fan switch—located on the same bracket as the control switch.

This switch is wired in series with the convection motor supply and will disconnect when
the door is opened.

SW5 Control switch—located on the top right behind the display connects to the

logic control PCB on a black and white twisted pair of wires. It is this signal that is used by

the control circuit to determine the door position. A closed contact indicates a closed door.

Door interlock operation

The door on the oven is monitored by five 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 and the fifth switches the power to the
convection motor.The switches operate as follows:

Door open position

Fused

Live

Live

LHS

RHS

Control PCB

Convection Fan

Neutral

Neutral

Output

SW2 Primary

SW5

SW4

SW3 Secondary

SW1 Monitor

Page 13 400 Series Ovens 32Z3769 Issue 1

Procedure for Door Interlock and test:

The three interlock Microswitches are located
on the LHS of the oven.
Release the 2 screws retaining each
microswitch assembly just enough to allow
the assembly to move.

The purpose of this procedure is to set the interlock so that when the
door is opened more than 3mm the Oven microwave circuit is switched
OFF.

The door closed position [Microwave circuit ON] is actually set with a
1mm opening to allow for heat expansion when the oven is operating at
full temperature.

WARNING

Before adjusting the microswitch assemblies ensure that the oven has been
isolated from the electrical supply and discharge the HT Capacitors.
Please note the terminals on the microswitches remain live when the oven is

switched off, so complete isolation is essential.

1

To set Microswitches SW1 & SW2 and SW3 to OPEN [OFF] at a

door opening with a 3mm gap:

Slide forward Microswitch assembly to set SW2 to just click CLOSED

and then allow the assembly to move slightly approx. 0.05– 0.10 Inch

(1-2mm) to just allow the switch to return to the OPEN position and

tighten both screws.

Repeat for SW3 rotating clockwise to CLOSED until it just opens then
anti-clockwise slightly to the OPEN position and tighten screws.

Position the door open with a 3mm gap:

Place the two 3mm Spacers over the door seal at the top of the

door on each side at the corner and carefully close the door
ensuring the spacer is on the door seal.

2

3mm Spacers

Door
Seal

Door

Five Microswitches:
SW1, SW2 & SW3 door
interlock Microswitches are
located on the LHS of the
oven.
SW4 & SW5 are located on
the RHS of oven behind the
control panel.
SW4 switches off the
convection fan
SW5 sends a ‘door open‘
signal to the Control Board

SW3

SW1 & SW2

Tools Required: Door Spacer Kit P10H0129, Multimeter

Page 14 400 Series Ovens 32Z3769 Issue 1

3

Remove the 3mm spacers and open and close
the door 2 or 3 times to allow the parts to work
together.

Set a Multimeter Resistance [ Ω ] and connect
the meter to the microswitch terminals 37 &

29.

Check that microswitches SW1,SW2 and SW3 are in the CLOSED [ON]
position and the Multimeter reads a minimal resistance.

If the meter reads Open Circuit, remove the 1mm spacers and repeat steps 1­4 moving the switch assemblies very slightly further down.
This procedure may need to be repeated several times to achieve a
satisfactory arrangement.

4

To confirm the oven operates at a 1mm door open position.

Replace the 3mm spacers with the two 1mm Spacers.

1mm Spacers

0.1

Open Circuit

3mm Spacers

The meter should now read open circuit,
if not repeat steps 1 & 2 adjusting the switch assemblies slightly

upwards, ensuring the Microswitches are in the OPEN [OFF]

position.

Replace the 3mm spacers on the door and over

the corners of the seal as before.

Door
Seal

Door

Door
Seal

Door

Page 15 400 Series Ovens 32Z3769 Issue 1

1 Side Panel (L/H) MC3134

2 Ferrite RMC6773

3 Upper Trim MC3120MC

4 Top Plate RMC6759EMC

6 Rear Panel MC3769MC

7 Air Filter MC3155

8 Side Panel (R/H) MC3145

Principal components: casework

9 Handle Hanger RCK6319

11 Front Lower Panel MC3047

12 Lower Trim MC3122

96 PCB Retainer 40H0084

104 Side Trim LH MC3789MC

105 Side Trim RH MC3121

140 Rubber Base seal long

Rubber Base seal short

40H0259
40H0260

1

2

4

2

6

7

8

9

12

11

96

105

104

3

140

Page 16 400 Series Ovens 32Z3769 Issue 1

Door mechanism

13 Door Stay (R/H) MC3040

14 Hinge Body MC30121X02

15 Hook (A) RMC66171

16 Hook (B) RMC66172

17 Door Spring (B) MC3068X01

18 Hinge Body (L/H) MC30122X01

19 Door Spring (A) MC3067

20 Door Stay (L/H) MC3046

22 Solid Door Assy Silver MC3230MCX02

Page 17 400 Series Ovens 32Z3769 Issue 1

34 Motor Bracket RMC7307X01

137 Thumb nut 31Z4031

37 Convection Motor MC3730MOD

135 Catalytic Converter 31Z1245

136A Vent Plate 40H0236

23 Turntable Disc RMC7340X01

24 Baffle Plate Bolt CP30326

25 Baffle Plate MC3018

26 Fan Fixing Cap RCK7617

27 Convection Fan MC3111

30 Oven Body MC3750MC

31 Gearbox MC3216

32 Shaft RMC7391X01

33 Motor Cooling Fan RMC7310

Oven cavity components and hot air system

136A

25

137

135

Catalytic Converter

Page 18 400 Series Ovens 32Z3769 Issue 1

Oven door assembly

22 Solid Door Assy. MC3230MCX02

38 Door Handle Silver RBR1285048

40 Door Cover Outer 40H0080

41 Inner Panel 40H0081

42 Door Reinforcement RMC70722

43 Door Frame (B) MC3055

44 Insulation Wrap 32Z0001

46 Door Base Silver MC3031X05

47 Door Cover MC3064X01

49 Plate - Door Switch LHS MC0562MC

52 Packing (B) MC3065

53 Door Rear Plate MC3229

48 Plate - Door Switch RHS MC3056

49

Page 19 400 Series Ovens 32Z3769 Issue 1

Door Interlock RHS, Magnetron & Stirrer Motor

129

133

61 Foam Tape 31Z0042

63 Magnetron 30Z1349

64 Magnetron Thermal trip 30Z0088

129 Turntable Motor 11H0110

54 Door Switch Bracket 40H0023

55 Microswitch SW4 30Z0240

56 Microswitch SW5 30Z0240

59 Microswitch Insulator 31Z0115

60 Outlet Duct MC3037

Page 20 400 Series Ovens 32Z3769 Issue 1

Principal Components LHS & Rear view:

57

Microswitches

57 Secondary Microswitch SW3 30Z0240

117 Axial fan 11H0075

138 Primary Microswitch SW2 30Z1396

139 Monitor Microswitch SW1 30Z1395

37 Hot Air Motor MC3730MOD

55 Microswitch SW4 30Z0240

56 Microswitch SW5 30Z0240

69 Thermal cut-out switch 30Z1024

73 Heater Element 240V 40H0009

74 Temperature Sensor 30Z1419

143 Motor Resistor Assembly1 11H0122

142 Exhaust steam pipe MC3773

73

37

69 74

55

138

139

117

56

142

143

Note:

1. The 270Ω Resistor is required to

drop the supply voltage to the
Convection Fan Motor to 208V.

Page 21 400 Series Ovens 32Z3769 Issue 1

Principal Components RHS 1 : Models _ EE5, _ XE5, [CD2]

128

90

76A

76

60 Outlet Duct MC3037

70 Bridge Rectifier 341520

71 No. 8 Screw 31Z3107

76 HT Capacitor 0.75uF 2500V 30Z1329

76A Capacitor Clip 30Z1261

90 Transformer 208-240 50Hz 30Z1233

117 Axial Fan 11H0075

128 Cooling Fan 240V 50Hz 11H0091

117

60

70

71

Page 22 400 Series Ovens 32Z3769 Issue 1

Principle components RHS 2: _ EE5, _ XE5

75 HV Diode Assembly 11H0010

76 HT Capacitor 0.75uF 2500V 30Z1329

88 HT Transformer Top Bracket MC3127

89 HV Lead Assembly, Ferrite 11H0025

90 Transformer 208-240V 50Hz 30Z1233

91 HT Transformer Bottom Bracket 40H0070

92 Capacitor Band RMC7215

93 Filter Bracket 40H0065

94 HT Transformer Support Bracket MC3024

Page 23 400 Series Ovens 32Z3769 Issue 1

Principle components RHS 3: _ XX5, _XX52

128

140

130

90

90

76A

76

76 HT Capacitor 0.75uF 2500V 30Z1329

76A Capacitor Clip 30Z1261

90 Transformer 208-240 60Hz 30Z1233

117 Axial Fan 11H0075

128 Cooling Fan 208V 50Hz 30Z1128

130 Diode Board 11H0058

140

Potentiometer1

11H0058

117

Note:

1. The

Potentiometer adjusts the cavity set point temperature

Page 24 400 Series Ovens 32Z3769 Issue 1

77 Microwave Mains Filter 16A 30Z1340

78 Heater Mains Filter 16A 30Z1340

79 Fuse Cover 20Z1080

80 Fuse 10A HRC 30Z0217

81 Fuse Holder 1” 30Z0231

82 Fuse 13A 30Z0456

Input wiring, filters and fuses 1

Blue

78

82 79

80 79

81

111 116 113 111 115 112

112a

Green / Yellow

Brown

111 Mains Input Block 31Z0328

112 Cable Gland 31Z1070

112A Cable Gland Nut 31Z1082

115 XE5 Input Cable Assembly 302030

116 Strain Relief Grommet 31Z1036

Model 1003__XE5, XD5

Blue

Green / Yellow

Model 1003__EE5, CD2

81

77

Model:

UK

Cable

Assembly

113 _ EE, _CD2 10H0012

113 _XE5 [Single phase] 10H0011

Europe

113 _XE5 [Single phase] 10H0064

Page 25 400 Series Ovens 32Z3769 Issue 1

Input wiring, filters and fuses 2

Model RMC1003__XX5, XX52

Green / Yellow

Blue

Brown

77 Microwave Mains Filter 16A 30Z1340

78 Heater Mains Filter 16A 30Z1340

80 Fuse 10A HRC 30Z0217

81 Fuse Holder 1” 30Z0231

82 Fuse 13A 30Z0456

78

77

80

81

82

81

L2

Green / Yellow

Blue

L1

111 Mains Input Block 31Z0328

112 Cable Gland 31Z1070

112A Cable Gland Nut 31Z1082

113 Input Cable Assembly 31Z0220

116 Strain Relief Grommet 31Z1036

111 111 115 112

112a

Model:

UK

Cable

Assembly

115 _ XX5 [Single phase] 10H0046

115 _XX52 [Twin phase] 10H0039

Europe

115 _XE5 [Single phase] 10H0065

115 _XX52 [Twin phase] 10H0063

115

Page 26 400 Series Ovens 32Z3769 Issue 1

Control Panel 1: Electronic controls assembly

95 Membrane Assy See table

97 On/Off Switch 30Z0503

98 Logic Assy. See table

99 Support Shield 40H0075

100 M3 x 5 Screw 31Z3106

101 No. 4 x 3/8” Screw 31Z3112

102 220R 50W Resistor 30Z0235

103 Relay Assy See table

107 PCB Stand-off 31Z7010

108 15 Way Ribbon Connector 11Z0298

109

Single 0.25” Blade Tag Connector

309610

110 M3 Nylon Support 31Z0206

131 Menukey Assembly 10H0081

97

102

100

110

110

101

107

107

97

131

98

95

99

98

108

103

109

Model Membrane Assy

EE5, XE5, XX5 11H0060

XX5 Starbucks 11H0024

EE5, XE5, XX5
Menukey

11H0067

95

Model Logic PCB Relay PCB

EE5, 11H0066 11C0286

CD2, XD2 N/A 11H0027

XE5, XX5 11H0066 11H0077

98 103

Page 27 400 Series Ovens 32Z3769 Issue 1

Control Panel 2: Membrane panel circuit

You will need:

A Digital Multi-meter (D.M.M.)

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 Assy.

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.

525° 350° 400° 440° 480°

Page 28 400 Series Ovens 32Z3769 Issue 1

Control Panel 3: Manual control assembly

Control Board not
shown for clarity

122

121

127

123

124A

124B

124C

124D

125

126

123

97

106

105A

96

96 PCB Retainer LH 40H0084

97 On/Off Switch 30Z0503

105A Side Trim RH MC31212

106 M5 Flat Washer 31Z5004

121 PCB Assembly 11H0027

122 Timer 30Z0991

123 Amber Neon 316031

124A Control Knob Black 313020

124B Control Knob Skirt Red 313160

124B Control Knob Skirt Blue 31Z1216

124C Control Knob Cap Red 313220

124C Control Knob Cap Blue 31Z1217

124D Control Knob Shaft Adaptor 313030

124E Control Knob Assy Black/Red 11C0173

124E Control Knob Assy Blue 11C0406

125 Pushbutton (Start) 31Z0349

126 Red Neon 316030

127 Potentiometer 40C0892

96

122

Page 29 400 Series Ovens 32Z3769 Issue 1

1 SIDE PANEL (L/H) MC3134

2 FERRITE RMC6773

3 UPPER TRIM MC3120MC

4 TOP PLATE RMC6759EMC

6 REAR PANEL MC3769MC

7 AIR FILTER MC3155

8 SIDE PANEL (R/H) MC3145

9 HANDLE HANGER RCK6319

11 FRONT LOWER PANEL MC3047

12 LOWER TRIM MC3122

13 DOOR STAY (R/H) MC3040

14 HINGE BODY MC30121X02

15 HOOK (A) RMC66171

16 HOOK (B) RMC66172

17 DOOR SPRING (B) MC3068X01

18 HINGE BODY (L/H) MC30122X01

19 DOOR SPRING (A) MC3067

20 DOOR STAY (L/H) MC3046

22 SOLID DOOR ASSY MC3230MCX02

23 TURNTABLE DISC RMC7340X01

24 BAFFLE PLATE BOLT CP30326

25 BAFFLE PLATE MC3018

26 FAN FIXING CAP RCK7617

27 FAN MC3111

30 OVEN BODY MC3750MC

31 GEARBOX MC3216

32 SHAFT RMC7391X01

33 COOLING FAN RMC7310

37 HOT AIR MOTOR MC3730MOD

38 DOOR HANDLE SILVER RBR1285048

40 DOOR OUTER 40H0082

34 MOTOR BRACKET RMC7307X01

41 INNER INSULATION PANEL 40H0081

42 DOOR REINFORCEMENT RMC70722

43 DOOR FRAME (B) MC3055

44 INSULATION WRAP 32Z0001
46 DOOR BASE SILVER MC3031X05

47 DOOR COVER MC3064X01

48 PLATE - DOOR SWITCH RHS MC3056

49 PLATE - DOOR SWITCH LHS MC0562MC

52 PACKING (B) MC3065

53 DOOR REAR PLATE MC3229

54 DOOR SWITCH BRACKET 40H0023

55 CONVECTION MOTOR

MICROSWITCH SW4

30Z0240

56 LOW VOLTAGE

MICROSWITCH SW5

30Z0240

57 SECONDARY MICROSWITCH SW3 30Z0240

59 MICROSWITCH INSULATOR 31Z0115

60 OUTLET DUCT MC3037

61 FOAM TAPE 31Z0042

63 MAGNETRON 30Z1349

64 MAGNETRON THERMAL TRIP 30Z0088

69 THERMAL CUT OUT SWITCH 30Z1031

70 BRIDGE RECTIFIER 341520

71 NO. 8 SCREW 31Z3107

72 M5 SCREW 101825

73 240V HEATING ELEMENT 40H0009

74 TEMPERATURE SENSOR 30Z1419

76 HT CAPACITOR 0.75μF 30Z1329

76A CAPACITOR CLIP 31Z1261

Part number identification chart 1

Page 30 400 Series Ovens 32Z3769 Issue 1

Part number identification chart 2

117 80MM AXIAL FAN 11H0075

128 COOLING FAN 208V 50HZ 30Z1128

129 TURNTABLE MOTOR

11H0110

130 DIODE BOARD 11H0058

131 MENUKEY ASSEMBLY 10H0081

133 INLET DUCT MC3793

135 CATALYTIC CONVERTER 31Z1245

136A VENT PLATE 40H0221

137 THUMB NUT 31Z4031

138 PRIMARY MICROSWITCH SW2 30Z1396

139 MONITOR MICROSWITCH SW1 30Z1395

140 RUBBER BASE SEAL LONG

RUBBER BASE SEAL SHORT

40H0259
40H0260

141 POTENTIOMETER 11H0058

142 EXHAUST STEAM PIPE MC3773

143 MOTOR RESISTOR ASSY 11H0122

77 M’WAVE MAINS FILTER 16A

30Z1340

78 MAINS FILTER 16A

81 FUSE HOLDER 30Z1178

82 FUSE 20A 30Z1177

90 TRANSFORMER 208-240V 50Hz 30Z1233

95 MEMBRANE ASSEMBLY See table

96 PCB RETAINER 40H0084

97 ON/OFF SWITCH 30Z0503

98 LOGIC ASSY. See Table

99 SUPPORT SHIELD 40H0075

100 M3 X 5 SCREW 31Z3106

101 NO. 4 X 3/8” SCREW 31Z3112

102 220R 50W GOLD RESISTOR 30Z0235

103 RELAY PCB ASSY See Table

104 SIDE TRIM LH MC3789MC

105 SIDE TRIM RH MC3121

106 M4 FLAT WASHER 31Z5004

107 PCB STAND-OFF 31Z7010

108 15 WAY RIBBON CONNECTOR 11Z0298

109 SINGLE 0.25” CONNECTOR 309610

110 M3 NYLON SUPPORT 31Z0206

111 MAINS INPUT BLOCK 31Z0328

112 CABLE GLAND 31Z1070

112A

CABLE GLAND NUT 31Z1082

113 POWER CABLE ASSEMBLY 11H0115

116 STRAIN RELIEF GROMMET 31Z1036

104 PCB Retainer RH 40H0084

121 PCB Assembly 11H0027

122 Timer 30Z0991

123 Amber Neon 316031

124A Control Knob Black 313020

124B Control Knob Skirt Red 313160

124B Control Knob Skirt Blue 31Z1216

124C Control Knob Cap Red 313220

124C Control Knob Cap Blue 31Z1217

124D Control Knob Shaft Adaptor 313030

124E Control Knob Assy Black/Red 11C0173

124E Control Knob Assy Blue 11C0406

125 Pushbutton (Start) 31Z0349

126 Red Neon 316030

127 Potentiometer 40C0892

CD2 Models

Model Membrane Assy

EE5, XE5, XX5 11H0060

XX5 Starbucks 11H0024

EE5, XE5, XX5
Menukey

11H0067

95

98 103

Logic PCB Relay PCB

EE5, 11H0066 11C0286

CD2, XD2 N/A 11H0027

XE5, XX5 11H0066 11H0077

Model

Page 31 400 Series Ovens 32Z3769 Issue 1

The MenuKey System automatically changes all the cooking programs
on the numbered icon pads with the turn of a key.

To change the menus on the oven:

APPENDIX 1: MenuKey™ Download Procedure

Ensure the power switch is off.

Lift the MenuKey cover in the
front panel of the oven and
put the key in the keyhole
Turn the key clockwise to the
stop ( ¼ turn ).

Do not remove the key at this

stage.

Switch the power switch on.

The oven will now go through the
program download sequence by
displaying the following:

The Key Code

The number of programs and each
program number on the key.

When the display shows 00:00
remove the key and close the cover.
The oven is now ready to use with the
new programs.

To confirm the download is successful

Switch off the oven.
Switch on and the display briefly will show the following:

1. The new key code

2. 00:00 (oven ready to use)

If the download is not successful the key number will not be
displayed and if the program pads are pressed an E3 error will
display.

EPS - FAIL - REDO
External Program
System ERROR.

If the key is removed
before the download is
complete or the process is
interrupted the display
shows “EPS” then “FAIL”
then “REDO”. Switch the
oven off and begin the
MenuKey download again.

1

2

3

example: Key C02

example: 27 Programs

Page 32 400 Series Ovens 32Z3769 Issue 1

Follow the SAFETY INSTRUCTIONS at the beginning of this manual.

Cleaning the control panel and exterior surfaces

Wipe down regularly with a damp cloth.

Hints and Tips for stubborn stains in the oven cavi ty

1. Switch on oven with microwave power only (without heat).

2. Place a container of water 2.5 Pints (1.5 litres) into the centre of the oven cavity.

3. Set microwave power to 100%.

4. Set timer to 30 minutes and press start button.
At end of steam cycle, wipe out cavity with a clean cloth.

APPENDIX 2: Cleaning Procedure

2. Remove food particles from between the inside edge of the door and
the front of the oven floor using a clean, dry brush ( Location A ).
Apply non-caustic oven cleaner to interior surfaces except door seals
and leave for the recommended time. Wash off using a clean cloth
and plenty of clean, warm water. Dry using a fresh, clean cloth.

3. Wipe hinges with a clean, damp cloth.
DO NOT apply lubricating oil to hinges.

4. Wipe door seals carefully with a clean damp cloth.
Examine for signs of wear or damage.

5. Replace the Catalytic Converter and cover plate

ensuring the face of the converter with the spacing
edge is facing outwards to allow air to pass efficiently through the
filter.Tighten up the three thumb nuts.

6. Replace all the parts and ensure the clean air filter is in place

• ALWAYS switch off at the electrical supply and allow oven to

cool for at least 20 minutes before cleaning

• As required, remove carousel and wipe out spillages 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 wi se to have the electrical
connections inspected periodically.

Cleaning the air filter oven cavity, and door

DO NOT SPRAY ANY CLEANING FLUID DIRECTLY INT O
THE CATALYTIC CONVERTER VENT HOLES AT THE
REAR OF THE OVEN CAVITY, THIS WOULD CAUSE
PERMANENT DAMAGE TO THE CATALYTIC
CONVERTER

1. Remove trays, racks, turntable and turntable disc from the oven
cavity and air filter ( on the rear panel) . Clean using non-caustic
oven cleaner. Wash off using a clean cloth and plenty of clean,
warm water. Dry using a fresh, clean cloth.

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

To remove the catalytic converter at the rear of the cavity undo the

three thumb nuts to release the cover plate and carefully lift out.

Wash the catalytic converter in CLEAN HOT WATER only, do not

use cleaning products which could cause permanent damage to the
filter. Leave to dry.
Clean the cover plate in non-caustic oven cleaner and dry using a
fresh clean cloth.

A

If the door seals are

damaged ,the oven

must be repaired by

an approved

Service Engineer

Merrychef recommends the use
of approved Merrychef Oven
Cleaner and Merrychef Oven
Protector.

spacing

edge

Thumb
Nut x3

Catalytic converter

rear of
oven cavity

Page 33 400 Series Ovens 32Z3769 Issue 1

RECOMMENDED PARTS LIST: 240V 50Hz Models _EE5, _XE5, CD2,

Page 34 400 Series Ovens 32Z3769 Issue 1

RECOMMENDED PARTS LIST: 240V 50Hz Models _XX5, XX52

Page 35 400 Series Ovens 32Z3769 Issue 1

Circuit Diagram: Models _ EE5

Issue 10

HEATER ELEMENT

SOFT START

RESISTOR

470 R GOLD

240

LOW

VOLTAGE

FUSE 1

10 AMP

HEATER

MEMBRANE

LOGIC BOARD

CON 2

T

MAINS

SWITCH

T1

FUSE 2

13 AMP

FILTER

FILTER

N(3) L(1)

U(4) U(2)

N(3)

U(2)

N

RL5 RL7

RL1 RL2

DOOR SWITCH

RL6

XE VERSION USE CN13

EE VERSION USE BRIDGE AND CN11

JP1 JP3JP2

SHORTING LINK

11C0286

TOP RIGHT

14 13 11 12

2

33 34 35 36

1

19 30 29 28 18 20 21 22

4

865

23

7

10 24 25

3

64

CAVITY

SENSOR

74

MAGNETRON CUT-OUT

56

LIVE

NEUT

EARTH

HOT

AIR

FAN

AXIAL

FAN

BLOWER

ASSY

TRANSFORMER

L(1)

FULL/HALF

SOFT MICRO

-WAVE

95

U(4)

ALL HEATER CIRCUIT

USES RED WIRE

AND STEEL CRIMPS

31Z0425

2787324

CAVITY oh

FAN

AXIAL

pb

pb

RHS TOP MOTOR SWITCH

SW1

LHS TOP REAR MONITOR

LHS BOTTOM BACK SECONDARY

SW3

LHS TOP FRONT PRIMARY

SW2

ACACAC

AC

142

3

1

3

2

Page 36 400 Series Ovens 32Z3769 Issue 1

Circuit Diagram: Models _ XE5

Issue 11

HEATER

ELEMENT

470 R GOLD

FUSE 1

HEATER

MEMBRANE

LOGIC

BOARD

CON 2

T

MAINS

SWITCH

FUSE 2

FILTER

FILTER

N(3) L(1)

U(4) U(2)

N(3)

U(2)

RL5

RL1

RL2

DOOR

SWITCH

RL6

JP1 JP3

11H0077

TOP

RIGHT

14

13

33 34 35 19 30 29 28 18 20 21 22 8 6 5 23 7 10 24 25

64

CAVITY

SENSOR

74

MAGNETRON

CUT-OUT

56

LIVE

NEUT

DOOR

OPEN

POSITION

EARTH

HOT

AIR

FAN

AXIAL

FAN X2

L(1)

SOFT MICRO

-WAVE

95

U(4)

T1

SOFT

START

LIVE

2

2

MAG

FAN

COOL

240

LOW

VOLTAGE

N

TRANSFORMER

RESISTOR 270 OHMS

RHS TOP MOTOR SWITCH

36

CAVITY OVERHEAT SWITCH

1

Or

2Ph

1Ph

LHS TOP REAR MONITOR

LHS BOTTOM BACK SECONDARY

SW1

SW3

LHS TOP FRONT PRIMARY

SW2

1

3

2

Page 37 400 Series Ovens 32Z3769 Issue 1

Circuit Diagram: Models CD2

Issue 06

11H0027 CD2 CONTROL PCB

J1 DOOR

LHS TOP PRIMARY

LHS TOP REAR MONITOR

TOP RIGHT

DOOR

MAINS SWITCH

DOOR MICROSWITCHES

TEMP SET

HEATER ON

POWER SET

COOKING

TIMER

M

12

POWER

START

80mm AXIAL FAN

CONVECTION FAN

COOLING FAN /

T/TABLE MOTOR

CAVITYSENSOR

HEATER

MAG STAT

LIVE

NEUTRAL

EARTH

LIVE

LIVE

LIVE

LIVE

LIVE

LIVE

LIVE

LIVE

Not used post feb 2009

LIVE

LIVE

LIVE

LINK FOR 30ABRIDGE FOR 13A

EARTH

NEUTRAL

NEUTRAL

NEUTRAL

NEUTRAL

NEUTRAL

NEUTRAL

NEUTRAL

NEUTRAL

NEUTRAL

RETURN

LIVE

RETURN

RETURN

VR1

VR2

J2 CAVITYTEMP

ALL HEATER CIRCUIT

USES RED WIRE

31Z0425

AND STEEL CRIMPS

31Z0511

CAVITY OVERHEAT SWITCH

L(1)

N(3)

U(2)

U(4)

RESISTOR 270 OHM

LHS BOTTOM BACK SEC

TOP RIGHT

MOTOR SWITCH

L(1)

U(2)

N(3)

U(4)

1111

RL3

FULL

RL3

FULL

ACACAC

AC

1

4

2

3

1414

2222

22

1

2

44

1717

tt

2727

S?

SW PUSHBUTTONS?SW PUSHBUTTON

2626

1 2

EARTHEARTH

HT1HT1

33

123

1515

1 2

99

2525

123

470R470R

2424

66

2222

RL1

START

RL1

START

1616

OPTO

START

OPTO

START

77

1818

2020

RL5

HEAT

RL5

HEAT

2828

1212

1 2

11

RL4RL4

3030

55

2121

RL6

HALF

RL6

HALF

2929

1919

1313

1010

123

RL2

SOFT

RL2

SOFT

88

Page 38 400 Series Ovens 32Z3769 Issue 1

Circuit Diagram: Models _ XX5, _XX52

Issue 05

HEATER ELEMENT

470 R GOLD

FUSE 1

10 AMP

HEATER

MEMBRANE

LOGIC BOARD

CON 2

T

MAINS

SWITCH

FUSE 2

13 AMP

FILTER

FILTER

N(3) L(1)

U(4) U(2)

N(3)

U(2)

RL5

RL1

RL2

DOOR SWITCH

RL6

JP1 JP3

11H0077

TOP RIGHT

14

13

33 34 35 19 30 29 28 18 20 21 22 8 6 5 23 7 10 24 25

64

CAVITY

SENSOR

74

MAGNETRON CUT-OUT

56

LIVE

NEUT

DOOR OPEN

POSITION

EARTH

HOT

AIR

FAN

AXIAL

FAN X2

L(1)

SOFT MICRO

-WAVE

95

U(4)

T1

T2

SOFT

START

470 R GOLD

SOFT

START

9

LIVE 2

2

MAG

FAN

COOL

26

T/TABLE

MOTOR

Or

2Ph

1Ph

240

LOW

VOLTAGE

N

TRANSFORMER

RESISTOR 270 OHMS

36

CAVITY OVERHEAT SWITCH

1

LHS TOP FRONT PRIMARY

SW2

LHS TOP REAR MONITOR

LHS BOTTOM BACK SECONDARY

SW1

SW3

RHS TOP MOTOR SWITCH

33A

1

3

2