Specifications

32
Service & Parts Manual original Instructions
Part Number 32Z3839 GB
Issue 5
Service & Parts Manual original Instructions
Part Number 32Z3839 GB
Issue 5
33
TESTING
COMPONENTS
TESTING
COMPONENTS
A
C
B
A
17.4 OVEN TESTS
17.4.1 Enter Service mode (Servicing section).
17.4.2 Select the down arrow to display the
individual Oven tests (A) for the oven to perform.
17.5 Microwave Power Test
Measuring the power output.
Note: The power output is established under IEC
705 standard method which is only workable in
Laboratory controlled conditions. Power output is also
aected by line voltage under load, so this test is an
approximation only.
17.5.1 Ensure the oven is cold, then enter Service
mode to bypass oven preheating.
17.5.2 Select Visual View (B) to check the oven cavity
temperature reading is as close to 0°C as possible.
1 Fill a microwave safe container (glass or plastic)
with one litre (1.78 pints) of tap water at about
20°C (68°F).
2 Measure and record the water temperature in
the container using a thermometer capable of
reading ±0.1 degree increments.
3 Place the container centrally inside the oven.
4 Select ‘Microwave Power Test’ (C) from the
service mode tests. (Microwave power 100% for
63 seconds, fan minimum).
5 When the countdown has nished, remove the
container from the oven, immediately stir with
a plastic implement and measure the water
temperature.
6 Calculate the temperature rise of the water (end
temperature minus the start temperature).
If the temperature rise is outside these limits:
● Check the microwave circuit and components,
(Testing Components section).
The Temperature Rise should be:
e2 14.3°C (58°F) ±5%
17.6 Microwave Leakage Test
Note before measuring.
● Make sure that the survey meter you are
using has been calibrated and is suitable for
measuring frequencies of 2,450 MHz.
● Do not exceed meter full scale deection,
leakage meter should initially be set to
the highest scale, then adjusted down as
necessary to ensure that low readings are
measured on the most sensitive range.
● To prevent false readings, hold the probe on
the grip provided and move at 2.5cm/second.
● Always hold the probe at right angles to the
oven and point of measurement, ensuring the
probe is reading 50mm from the test area.
● The leakage should not exceed 5mW/cm².
Procedure
17.6.1 Add 275ml of cold water into a 600ml
microwave safe container.
17.6.2 Place the 600ml container in the centre of
oven and close the door.
17.6.3 Enter Service mode and select ‘Microwave
leakage test’ (A) from the oven tests.
17.6.4 Set the leakage meter to the appropriate
scale/range.
17.6.5 Move the survey meter probe across all
casework joins and vent areas including those
marked in yellow, shown opposite.
17.6.6 When the Magnetron circuit stops after 30
seconds, change the water and re-select the test to
continue.
17.6.7 Select the red ‘X’ on the display to stop the
test at any time.
17.6.8 Readings must be below 5mW/cm². If a level
greater than 5mW/cm² is observed, this should
be reported to the Merrychef Service Department
immediately, and the oven should not be used.
17.6.9 Notes should be kept of any leakage that
is observed in terms of the level and position on
the oven. This information should be kept with the
service documentation.