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 Microcook HD Ovens 32Z3385 Issue 5
Page 3
SAFETY CODE
This manual is designed to assist engineers who have successfully completed a Merrychef
Service training course. It has been prepared to offer technical guidance for the Merrychef
Microcook HD and Microcook TA 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
The following must be carried out prior to removing the rear cover from the oven :
• 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 mains
isolator switch.
Upon completion of a service on an Microcook 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 three door safety interlocks are secure and mechanically sound.
• The door operation is smooth.
• The door activates all three 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:
• The oven is electrically safe
• 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 (8 & 9).
• Microwave emission is below permissible limit - 5 mW/cm²
(see BS EN 60335-2-90).
• Oven has correct 50mm air gap all round. Air flow should not be restricted.
Page 3 Microcook HD Ovens 32Z3385 Issue 5
Page 4
Product specifications:
Microcook HD Series
Microcook HD1025, HD1425, HD1725, HD1925 & HD2025
Model Number: Model prefix + Type + Voltage + Frequency + UK/Export + Customer
For example: 1925C450UK
Model 1925, Microcook, 230-240V, 50Hz, UK model
Model
Type Frequency UK/Export
Voltage
prefix
1025
1425
1725
C= Cook
V=Vend
2= 220-230V a.c.
4= 230-240V a.c
1925
2025
Power
Requirements
Model HD1025
Model HD1425
Model HD1725
Model HD1925
Model HD2025
TA1725 100%,50%, turbo
TA1925 100%, heat only, turbo
Up to 9 minutes 59 seconds
Up to 3 Programmed cooking stages of up to 9 minutes
59 seconds each ( total 29 minutes 57 seconds)
Page 5 Microcook HD Ovens 32Z3385 Issue 5
Page 6
Installation instructions
Power Supply Requirements
The Microcook HD & Microcook TA ovens 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.
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.
NEVER Install an oven above fryers, grills, griddles or any other major heat
source.
NEVER Stack machines on top of each other
ALWAYS Place containers in the cavity carefully - impact damage may chip the
oven shelf.
A – HD2025 Model
B – HD1025 Model
Note:
The 840mm clearance at the front allows the
complete removal of the door for cleaning
Page 6 Microcook HD Ovens 32Z3385 Issue 5
Page 7
Error codes and diagnostics
The Microcook 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:
All HD & TA Models
Display Fault (frequency) Recommended Action
Door not fully closed
1
(permanent)
Magnetron
2
overheating
(Intermittent)
Membrane panel
1
failure
(permanent)
2
Membrane panel
failure
(Intermittent)
Incorrect time set.
3
( Intermittent )
Check the door is fully closed.
Check the door down LED is illuminated on the control
board.
Check ribbon connector condition and fit.
Ensure the oven has been
installed correctly.
Check the magnetron cooling fan is operating and free
from obstruction.
Replace membrane panel.
Replace membrane panel.
Check correct time is set
ie : 1.00 minute Not 60 seconds
KFC HD Models (with Fibre Optic Magnetron Detection)
Display Fault (frequency) Recommended Action
LH Magnetron Failure
RH Magnetron Failure
Both magnetrons have
failed
Check Power supply
Replace magnetron(s)
TA Models
Display Fault (frequency) Recommended Action
1
Convected hot air
failure (permanent)
2
Intermittent
Microcook TA
Check full / half wave LED
on control board
Check heating element
Page 7 Microcook HD Ovens 32Z3385 Issue 5
Page 8
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 1litre 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 60’seconds.
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 8 Microcook HD Ovens 32Z3385 Issue 5
Page 9
Procedure B - Simplified Power Output 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 on the turntable in the oven and close the door.
4 Turn the oven on.
5 Set the timer to 1:02.
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 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:
a Mains winding between tags
b High Voltage winding
c Filament winding
between terminals
Approx. 1.3 Ω
Approx. 82 Ω
Less than 1 Ω
c
b
5 Using a Megger, test the insulation resistance between:
Primary winding and chassis
Filament winding 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
a
Page 9 Microcook HD Ovens 32Z3385 Issue 5
Page 10
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 10 Microcook HD Ovens 32Z3385 Issue 5
Page 11
Door interlock operation
The door on the Microcook oven is monitored by three microswitches used in the conventional
“Primary, Secondary and Monitor” switch arrangement shown below.
L
Power In
N
The switches operate as follows:
1. Monitor Switch [TopRight]. As the door is closed, the monitor switch is opened.
2. Primary Interlock Switch [ Bottom Left ]. The Primary switch is then closed.
3. Secondary Interlock Switch [ Bottom Right ]. The Secondary Switch then closes.
When the door is opened, the switches operate in the reverse order.
Primary
Door Interlock
Arrangement
Monitor
Secondary
Power
Out
Page 11 Microcook HD Ovens 32Z3385 Issue 5
Page 12
Main features
a c
micro
cook
turbo
aire ll
Vend model (KFC)
d
e
e
f
g
C
C
Description of Features
a. Program Pad
b. On/Off Switch
c. Program Display
d. Program Selection / Time Set Pads
e. Power Selection Pads
HD models:100%, 50% & de-frost
TA models:100%, hot-air & turbo
f. Time Display
g. Cancel / Callback Pad
h. Door
b
h
Page 12 Microcook HD Ovens 32Z3385 Issue 5
Page 13
Rear cover assembly
1
All other models
HD1025 only Rear View
5
Outer View
Inner View
2
1
5
3
7 6
No Description HD1025 HD1425 HD1725 HD1925 HD2025 TA
TA 1725 and TA 1925 Fan control PCB – part no. 11M0261
This board provides a full temperature-control system for the Turboaire Hot Air Fan, this will need
to be set up in accordance with the following procedure once replaced. It also monitors the Fan
Motor performance, and sends a signal to the logic PCB Assembly to indicate that it is functioning
correctly. The status of the various functions are indicated by the monitor LEDs.
Thermocouple Sensor Input
When power is connected to the oven, the “Sensor Error” LED (D6) should not illuminate. If this
happens, there is a bad connection or a broken wire in the thermocouple sensor. Using a suitably
insulated pair of long nose pliers, short the + & - terminals together (D6) should then go out. If this
does not happen the PCB is faulty and requires replacing.
Thermocouple Operation
Using a multimeter set to read in excess of 1V dc ,connect the black lead to the pin marked
“GND” and the red lead to the pin marked “T+”. A reading in millivolts of ten times the nozzle
temperature should be obtained:
If the nozzle is at 22.0 C, then the reading should be 220mV
If the nozzle is at 19.2 C, then the reading should be 192mV
Page 26 Microcook HD Ovens 32Z3385 Issue 5
Page 27
TA 1725 and TA 1925: PCBboard operation during oven use
The operation of this PCB is best tested when the oven is in operation. You will need to have a
pen and paper to hand in order to set up the Nozzle temperature.
(see Adjusting the nozzle temperature below for further details).
Initial Status of PCB Monitor LEDs
When the oven is turned on, the status of the LEDs on the PCB are as follows:
D1 Fan OK Off
D4 Motor On Off
D6 Sensor Error Off
D7 Full / Half On
If any of the LEDs are not as above check all connections to the PCB.
Adjusting the nozzle temperature
Setting the nozzle temperature should be carried out prior to all microwave tests, or should be
carried out on an oven which has been turned off for at least one hour. If this is not possible, or
if the oven does not function in Turbo mode, proceed to the next section.
1. Place a water load of at least 500ml in a suitable heatproof container into the cavity.
2. Measure the voltage between the Set Temp pin and GND pin with a multimeter set to
read at least 10Vdc. Adjust VR1 clockwise until the reading exceeds 7.5V.
3. Program the TA Oven for 3 minutes in Turbo mode on pad 0.
4. Measure the voltage between the T+ pin and GND pin.
This should indicate the ambient temperature.
5. With the meter still attached, press pad 0. When the oven time display indicates 2:48,
note the voltage reading. This should be between 2.0V and 7.5V. Press the Cancel Pad.
6. Measure the voltage between the Set Temp pin and GND pin, and adjust VR1 until the
meter reads the same as the reading obtained above.
7. Press Pad 0 again , and verify that the Half / Full LED (D7) switches on and off during
the cooking cycle.
Note : The above setting up procedure must be carried out on a cold oven , as the
oven will not cook correctly if carried out on a warm oven.
Do not carry out this procedure on a warm oven.
Operation of LEDs during Turbo cooking
On completion of the above procedure, a functional test of the PCB should be made and
operation of the LEDs observed.
1. Place a water load of at least 500ml in a suitable heatproof container into the cavity.
2. Program the TA oven for 3 minutes in Turbo mode on pad 9.
3. Press pad 9. The oven should begin to cook and the Motor On LED should light.
4. After about 1-2 seconds, the Fan Ok LED should light .This allows the heater element
to work.
5. Within 10 – 20 seconds, the Full / Half LED should go out. This should switch on and
off during the cooking cycle.
6. When the time display shows 0:10 the heater element should switch off, which should
result in a change of pitch in the noise from the fan. This completes the operational
test.
Page 27 Microcook HD Ovens 32Z3385 Issue 5
Page 28
Input wiring details
L2
U
U
Blue
Blue
N
73
68A
68B 68C
Green / Yellow
Brown
101
102
102
Model HD1025
Model HD2025
No Description HD1025 HD1425 HD1725 HD1925 HD2025 TA
103 Menukey Assembly 10C0148
104 Top Panel Extrusion 40M1062
105 MenuKey connection lead 11H0064
106 Diode PCB 11M0364
40
39
38
See Appendix 6 for Logic Board
connections and jumper details
104
103
Top View
49
Page 36 Microcook HD Ovens 32Z3385 Issue 5
Page 37
APPENDIX 2: Capacitors and Magnetrons
Microcook HD & TA Models:
PANASONIC MAGNETRON 30Z1171
Oven Model Capacitor LH Capacitor RH
HD 1025 1.1µF 30Z1242 ( 1 only)
HD 1425 0.88µF 30Z1330 0.75µF 30Z1329
HD 1725
HD 1925 2x 1.1µF 30Z1242
HD 2025 2x 1.1µF 30Z1242
TA 1725 2x 1.0µF 30Z1331
TA 1925 2x 1.1µF 30Z1242
SANYO MAGNETRON
Oven Model Capacitor LH Capacitor RH
HD 1025 1.25µF 30Z1078 ( 1 only)
HD 1425 0.88µF 30Z1330 1.0µF 30Z1331
HD 1725
HD 1925 2x 1.25µF 30Z1078
HD 2025 2x 1.25µF 30Z1078
TA 1725 2x 1.1µF 30Z1242
TA 1925 2x 1.25µF 30Z1078
2x 1.0µF 30Z1331
2x 1.1µF 30Z1242
Page 37 Microcook HD Ovens 32Z3385 Issue 5
Page 38
APPENDIX 3: Cleaning procedure
For the oven to operate at peak efficiency, the cavity, door and the air filters 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 Ease the air filter cover from the top of the rear panel.
2 Wash in clean, warm soapy water, rinse and pat dry. Put
back into position.
DO NOT USE THE OVEN WITHOUT A CLEAN AIR
FILTER IN POSITION
Cleaning the door
1 Lift the door up and out of the channels.
2. Wipe the door and seals with a damp cloth.
NEVER IMMERSE DOOR IN WATER.
3 Examine the door and seals for signs of wear and
damage. Refer to SAFETY INSTRUCTIONS
4 Using both hands slot the door back into its channels and
slide firmly down.
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.
doorse
Air Filter
als
Cleaning the oven cavity
1 Wipe down the sides and the floor of the cavity with a
clean damp cloth.
2 Gently wipe the ceiling. Take care not to press upwards
as this could damage the concealed stirrer fans.
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.
DO NOT USE THE OVEN
WITHOUT A CLEAN AIR
FILTER IN POSITION
Page 38 Microcook HD Ovens 32Z3385 Issue 5
Page 39
APPENDIX 4: MenuKey download procedure
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:
Ensure the power switch is off.
1
Lift the MenuKey cover in the
2
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.
3
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.
example: Key C02
example: 27 Programs
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.
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.
Page 39 Microcook HD Ovens 32Z3385 Issue 5
Page 40
APPENDIX 5: Fitting 30Z1177 20A Anti surge fuse
PROCEDURE FOR REPLACING 13A ANTI-SURGE FUSES WITH 30Z1177 FLM020 Type
Brief description: The change in fuse is due to the manufacturer ceasing to make the 13A anti-surge
fuses Pt. No. 30Z0168 which are unique to our requirements. To overcome this we need to use the
FLM020 fuses Pt. No. 30Z1177 for the Microwave circuit on all Microcook HD1725 & HD1925 ovens.
The operation listed below is to be followed to any service calls where the 13A A/S fuses have blown.
Parts required:
1. Pt. No. 30Z1177 20A littlefuse FLM020 x1
2. Pt. No. 30Z1178 30A fuse holder (FLM Series) x1
3. Pt. No. 31Z2092 Label - 20A FLM fuse x1
4. Pt. No. 31Z2030 Label - 10A fuse x1
5. Pt. No. 31Z3061 No.6x3/8” self tap pan x1
PROCEDURE FOR REPLACING 13A ANTI-SURGE FUSES WITH FLM020 IS AS FOLLOWS:
1. Isolate oven from mains power
supply.
2. Remove rear cover to obtain
access to the side of the oven.
3. Strip back the GSS sleeving over the mains cable approx. 50mm and cable tie back into location.
(A)
4. Strip back the jacket of the mains cable, again approx. 50mm. (B)
A B
Page 40 Microcook HD Ovens 32Z3385 Issue 5
Page 41
5. Remove the blue fuse cover and the 13A fuse, then remove the 10A fuse and place in the 13A
fuse location. (C)
6. Remove the (BROWN) mains wire and the filter wire L2 from the 13A fuse holder. (D)
7. Move the wires from the 10A fuse holder and fit them to the 13A fuse holder. (E)
C
E
D
8. Fit new (10AMP LABEL) Pt. No. 31Z2030 over the old 13AMP label. Remove the old 10AMP
label and fit the new (20AMP LABEL) Pt. No. 31Z2092 into position so it will be visible when
new fuse holder is fitted. (F)
9. Connect the (BROWN) mains wire to the bottom location on the new fuse holder Pt. No.
30Z1178, connect the filter wire L2 to the top location of the fuse holder. (G)
10. Fit the fuse holder into position using Pt. No. 31Z3061 x1 in the upper most hole location,
ensure screw is bias towards the right hand side of the slot. (H)
11. Re-fit the blue cover to the 10AMP fuse holder. And fit the 20AMP fuse Pt. No. 30Z1177 in to
the new fuse holder. (J)
12. Power up the oven and check machine functions correctly. (Care should be taken when powering up ovens with covers removed).
13. Turn off the power and isolate the oven from the mains power supply, then fit the cover.
14. Please ensure that you record TB067 completed on your (SVR).
11M0416 KFC optic Logic PCB with Magnetron Failure Detect
in the event of failure the system will automatically compensate and double the remaining cook
times thus ensuring that the program achieves its target temperature in the food product. At the
end of the cooking cycle the system will display either “E4” = left hand magnetron failure or
“E5”= right hand Magnetron failure. In the event that both Magnetrons fail the system will report
an “EA” error. Once a failure is detected, It takes 4 seconds before the control circuit reacts thus
preventing false triggering
1
4 5 6
Ref. Description
1 Left hand side magnetron monitor enabled / override jumper
2 Right hand side magnetron monitor enabled / override jumper
3 Microwave power and operation jumper
4 Magnetron monitor receive left (fibre optic receive)
5 Magnetron monitor receive right (fibre optic receive)
6 Locking MenuKey cable connector
Jumper Description
1 If the magnetron failure detection is being used:
3
The jumper should be positioned between the enable pin and centre pin.
If not then the jumper should be positioned between override pin and
centre pin.
Please note that if the magnetron failure detection is not being used then
fibre optic cables and diode board 11M0363 are not required. This is
clearly indicated on the PCB itself.
2
2 As Jumper 1
3 01 - NC N/A
02 - 2025 Jumper ON = 2025
03 - 1925 Jumper ON = 1925
04 - 1725 Jumper ON = 1725
05 - 1425 Jumper ON = 1425
06 - 1025 Jumper ON = 1025
07 - 30 prog Jumper always ON
08 - Multi Jumper always ON
09 - Cook Jumper always OFF
10 - Man Jumper OFF = Automatic door
Jumper ON = Manual door
Page 42 Microcook HD Ovens 32Z3385 Issue 5
Page 43
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 (if applicable) - Microcook HD & TA
Description of error
Suggestion for improvement to manual
Please return this form to:
Service Dept.
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: technical.support@merrychef.com
Page 43 Microcook HD Ovens 32Z3385 Issue 5
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