Awi 140T User manual

SERVICE MANUAL
AWI 140T and 180T
For Technica For technical assistance please phone
00845 1303292

INDEX
1) SAFETY WARNINGS
2) SPECIFICATIONS
3) INSTALLATION
4) OPERATING INSTRUCTIONS
5) CLEARING MEMORY/OPERATIONS see section 4)7.1and 7.2
6) WIRING DIAGRAM, OVEN
7) WIRING DIAGRAM, PCB,KEY PAD AND RELAY BOARD
8) DECRIPTION OF OPERATION
INCLUDING DOOR SWITCH OPERATION
9) TESTING COMPONENTS/FAULT FINDING
10) POWER TESTING
11) EXPLODED VIEW
12) PART NUMBER IDENTIFICATION
1

SAFETY FIRST
DO NOT ATTEMPT REPAIRS IF YOU ARE NOT A
QUALIFIED MICROWAVE SERVICE ENGINEER
DANGER HIGH VOLTAGE
This manual is designed to assist qualified microwave service
engineers. Do not attempt to repair this machine before you switch it
off and remove the plug from inlet or if the machine is hard wired
switch it off and isolate at the circuit breaker.
Note: H.V circuitry is live whenever the fan motor is operating (via
relay 3 to operate soft/start system).
DO NOT TOUCH WHEN MACHINE IS PLUGGED IN.
1) Ensure H.V. Capacitors (2) are both discharged using a suitably
insulated discharge tool (AWI part number CSP1).
2) Do not attempt to measure High Voltage (C5000VDC) with the
machine operating.
3) After repairing the machine before reconnecting the mains supply
check the following:
a) All connections are correct and securely fitted.
b) Door interlock operation is correct.
c) Correct rating fuses are fitted and secure.
d) Earth connections are secure.
e) Cables are routed correctly and not rubbing on metal edges.
4) When power is connected check the following:
a) Machine does not emit microwaves until operated.
b) All controls are working correctly.
c) Microwave emissions are below maximum allowable of
5mw/cmmeasured at 5cm from the machine. Any leakage
in excess of 2mw/cm@5cm distance should be investigated.
d) Power output is within the rated output range of + or – 10%
at rated voltage.
2

SAFTEY FIRST
5) Before putting the oven back into service ensure the
following:
a) Power supply is correct and earth bonding secure.
b) Location is not detrimental to the machine.
c) Ventilation is adequate with 50mm clear all round the
machine.
REMEMBER
MICROWAVE OVENS ARE HIGH VOLTAGE/LOW IMPEDENECE,
HIGH VOLTAGE AND HIGH CURRENT, THEY CAN BE FATAL.
PLEASE TREAT WITH EXTREME CARE WHEN SERVICING.
3

AWI140T and AWI180T Specification
Power Requirement AWI180t
AWI140T
230-240 ac 50Hz 13.0A Single Phase
Power Output Microwave 100% AWI180T
AWI140T
1800W (IEC 705)
1400W (IEC 705)
External Dimensions Height
Width
Depth
335mm
510mm
415mm
Internal Dimensions Height
Width
Depth
Capacity
210mm
330mm
330mm
23 Litres
Weight Net 30kg
Construction Cavity & Case Stainless Steel
Settings Microwave
Timer
100% 75% 50%
Progressive defrost up to 30 ins.
Up to 3 cooking stages of 9 mins 59 secs
each.
Power Consumption AWI180T
AWI140T
3.1KW
2.5KW
Control System Wipe Clean Touch Pad
Direct Readout of time and powerset
10 Pre-programmed cooking sequences
Safety Features Four door interlock switches
Magnetron and cavity overheat sensors
Additional Features Manual and easy to use multistage programming
Built to increase magnetron life and for faster
activation
Multiple product facility

INSTALLATION
Power Requirement: This model should be connected to a minimum
13A 230volt single phase and earth supply via either the 3 pin plug
supplied, or a switched fused wall box with a type ‘C’ circuit breaker.
The power supply available should be sufficient to sustain the voltage
during switching and operation. Low voltage will result in lower
microwave output and may damage the equipment.
Air Requirement: Good cooling is essential to good microwave
operations. High internal temperatures due to air restriction will result
in lower microwave output and may damage the equipment.
Allow a minimum of 50mm (2 inches) all around the oven.
When stacking 2 ovens allow a minimum of 150mm (6 inches) above
the microwave ovens.
Remember the higher the machines are in the kitchen the higher the
inlet air temperature and consequently the lower the microwave
output.
DO NOT INSTALL AWI 180T ADJACENT TO OR ABOVE FRYERS,
GRIDDLES, CONVENTIONAL OVENS OR ANY OTHER
SUBSTANTIAL HEAT SOURCE.
DO NOT STACK OVENS WITHOUT USING THE ADAPTER.
DO NOT STACK OVENS ANY MORE THAN 2 HIGH
YOU MUST LEAVE A MINIMUM OF 50MM ALL AROUND THE OVEN
THERE MUST BE NO MORE THAN 2 METERS FROM FLOOR LEVEL
TO THE TOP OF THE HIGHEST AWI 140T or AWI180T
5

MEMORY CHECK AUTO MANUAL POWER
COOK X2 X32211
4. Manual operation
Manual operation is a method in which time and power can
be repeatedly adjusted depending on the type and
composition of the food which is being cooked.
4.1 1-stage cooking
Example 1:
2 minutes 15 seconds cooking time with 50% power.
Open door.
Place plate or dish in the oven.
The food should be evenly distributed on the plate in
order to ensure a constant heating process.
Close the door.
Press "Manual/Repeat pad"(C).
Set the correct time using pads (B):"2","1","5".
Press Power Selection pad (F).
(If this pad is not pressed, the oven will work at full(100%)
power).
Press pad "5" in order to work with 50% power.
Press START button(E). The digital display continuously
displays the remaining cooking time.
Interrupting the cooking process
Opening the door will automatically interrupt the cooking
process. The digital display will display the remaining
cooking time. To continue cooking, close door and press
STARTbutton (E).
In order to select a new cooking time/power, press pad
"STOP" (D).
Asignal will be heard at the end of the cooking process. It
will stop as soon as the door is opened.
Remove the food from the microwave oven.
In order to allow the oven to cool off, the fan will continue
running for another minute. Do not disconnect the
Microwave oven from the mains during this time.
6
A
B
C
D
E
F
GHI

4.2 2-stage cooking
Example 2:
Stage 1: 5 minutes 30 seconds cooking time with 70% power..
Stage 2: 3 minutes 10 seconds cooking time with 50% power.
This will result in a continuous cooking time of 8 minutes and
40 seconds.
Open door.
Place plate or dish in the oven.
The food would be evenly distributed on the plate in order
to ensure a constant heating process.
Close the door.
Press "Manual/Repeat"(C).
Set the time for the 1st cooking stage using pads (B):
"5","3","0".
Press Power Selection pad (F).
Press pad "7" in order to operate with 70% power.
Press "Manual/Repeat" pad (C).
Set the time for the 2nd cooking stage using pads (B)
"3","1","0".
Press Power Selection pad (F).
Press pad "5" to operate with 50% power.
Press START button (E).
The digital display and shows which cooking stage
of the programme is currently in progress.
Asignal will be heard at the end of the cooking process. It
will stop as soon as the door is opened.
Remove the food from the microwave oven.
In order to allow the oven to cool off, the fan will continue
running for another minute. Do not disconnect the
microwave oven from the mains during this time.
4.3 Repeat function
For ease of use with the this Microwave Oven, the
same cooking process can be repeated as often as you wish.
Place the plate or dish in the oven.
Close the door.
Press "Manual/Repeat" pad (C).
The digital display will indicate the time/power which was
last set.
Press the "START" button.
7
MEMORY CHECK AUTO MANUAL POWER
COOK X2 X32211
A
B
C
D
E
F
GHI

5. Programmed cooking
The programming function is automatically deactivated on
connecting the microwave oven to the mains.
The pads "Memory"(G),"Test"(H) und "Acoustic signal level" (I)
are inoperative.
5.1 To activate the programme
1. Close the door and press the Stop pad (D) twice.
2. Press Memory pad (G).
3. Press Start pad (E) twice.
4. Press the "0" pad.
5. Press Memory pad (G)
("MEMORY" will blink on the display).
The programming is now activated.
5.2 Deactivating the programme
1.Close the door and press the Stop pad (D) three times.
2.Press the pad "0".
The programming function is now cancelled. No information
can be programmed.
5.3 Using the Programme Memory
Up to 10 different cooking programmes can be stored in the
Memory.
It is possible to set 1 and 2 stage cooking in the Memory.
Example 1:
A 1-stage cooking programme using Memory space 1.
5 minutes cooking time with 70% power.
1. Activate the programming function.
2. Press the desired programme pad (B), in this instance "1".
3. Press "Manual/Repeat" pad (C).
4. Press pads "5","0","0".
5. Press Power Selection pad (F).
6. Press pad "7" for 70% power.
7. Press Memory pad (G).
To cancel a programming error, press Stop pad (D).
Then repeat steps 2-7.
In order to check whether a programme has been correctly
completed, press pad "Test" and then pad "1".
The programme set under this Memory space number
should appear on the display.
Cancel the programming function.
8
MEMORY CHECK AUTO MANUAL POWER
COOK X2 X32211
A
B
C
D
E
F
GHI

Example 2:
Set a 2-stage cooking programme in Memory space 2.
Stage 1: 5 minutes 30 seconds cooking time using 100%
Power.
Stage 2: 3 minutes 10 seconds cooking time using 10%
power.
Active theprogramming function.
Press the Programme pad (B), in the present instance:"2".
Stage 1
Press "Manual/Repeat" pad (C).
Press pads "5", "3","0".
Stage 2
Press "Manual/Repeat" pad (C).
Press pads "3", "1","0".
Press Power Selection pad (F).
Press pad "1" for 10% power.
Press Memory pad (G).
Cancel the programming function.
In order to use the remaining 8 programming spaces, you
repeat the process for the One-stage and Two-stage
programme as described under the above two examples.
Used programme pads can simply be overwritten if required.
5.4 To use the programme function once the microwave has been
programmed follow the instructions below.
Open the door.
Put the food which is to be cooked in the microwave oven
and close the door.
By pressing the desired Programme pad (B) the cooking
process will immediately start up.
An acoustic signal will be given at the end of the cooking
process. The signal continues until the door is opened.
Remove the food from the microwave oven.
In order to allow the oven to cool off, the fan will continue
running for another minute. Do not disconnect the
Microwave oven from the mains during this time.
Interrupting the cooking process
Pressing the Stop pad (D) will interrupt the cooking process.
The remaining cooking time will be shown on the digital
display.
Close the door and press the Start pad (E) to continue the
cooking process.
Cancelling the cooking process
The cooking process will be automatically cancelled by
opening the door. The remaining cooking time is not shown
on the digital display. If you wish to continue select a NEW
PROGRAMME.
9
MEMORY CHECK AUTO MANUAL POWER
COOK X2 X32211
A
B
C
D
E
F
GHI