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NN-8507, NN-8557
NN-8807, NN-8857
MEASUREMENTS AND ADJUSTMENTS
1. Adjustment of safety switch A, safety switch B and
short switch
(A) When mounting the safety switch A, safety switch B and short switch
to the door hook assembly, mount the safety switch A, safety switch B
and short switch to the door hook assembly as shown in Fig. 37.
NOTE: No specific adjustment during installation of safety switch A, safe-
ty switch B and short switch to the door hook is necessary.
(B) When mounting the door hook assembly to the oven assembly, adjust
the door hook by moving it in the direction of arrow in Fig. 38 so that
the oven door will not have any play in it. Check for play in the door by
pulling the door assembly. Make sure that the latch keys move
smoothly after adjustment is completed. Securely tighten the screws
holding the door hook assembly to the oven assembly.
2. Measurement of microwave output
The power output of the magnetron can be determined by performing
a simple water heating test as described below.
Necessary Equipment:
*Two 1 litre beakers
*Glass thermometer
*Wrist watch or stopwatch
NOTE: Check the line voltage under load. Low voltage will lower the
magnetron output. Take-the temperature readings and heating
time as accurate as possible.
(A) Fill each beaker with exactly one litre of tap water. Stir the water using
the thermometer and record each beaker's temperature (recorded as
T1A and T18).
(B) Place both beakers on the center of glass cook plate.
Set the oven for High power and heat it for exactly two minutes.
(C) Stir the water again and read the temperature of each beaker (re-
corded as T2A and T2B).
(D) Obtain the temperature rise by using the following formula:
;
(T2A + T2B)—(T1A + T1B)
Average temperature rise =
2
The normal temperature rise for these models should be 8.9" to 11°C
at the "High" power selection with the oven operating at the specified
line voltage.
(E) To obtain the power output, multiply the average temperature rise by
70.
Example:
If you find average temperature rise of 10°C, the ovens output is
10 X 70 = 700 watts.
NOTE: This test may be conducted by heating one litre of water for one
minute if only one beaker is available. In this instance you will find
the temperature rise being smaller than the above specifications
due to the microwave absorption characteristic. You may judge
the magnetron to be normal when the temperature rise is greater
than 7.5°C.
DOOR
HOOK
ASSEMBLY
SAFETY
SWITCH
A
DOOR
KEY
A
SWITCH
ACTUATOR
SHORT
LEVER
A
SWITCH
SAFETY
SWITCH
B
SWITCH
ACTUATOR
LEVER
C
SWITCH
ACTUATOR
DOOR
KEY
B
LEVER
B
Please confirm that the gap between the switch housing and switch
actuator levers is no more than 1.0mm when the door is closed.
Fig. 37
DOOR
KEY
A
SAFETY
SWITCH
A
DOOR
HOOK
ASSEMBLY
SHORT
SWITCH
SAFETY
SWITCH
B
Fig. 38
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