Panasonic NN-8508 - Page 24

NN-8508, NN-8558
NN-8808, NN-8858
NN-8808P
PROCEDURE FOR MEASURING MICROWAVE ENERGY LEAKAGE
WARNING
Check for radiation leakage after every servicing.
Should the leakage be more than 2 mW/cm (1mW/
cm for Canada) inform the MSC, PHI, PSC or MELCA
immediately. After repairing or replacing any radiation
WARNING
AVOID CONTACTING ANY HIGH VOLTAGE PARTS.
MAGNE TRON
safety device, Keep a written record for future refer-
ence, as required by D.H.H.S and NHW regulation.
This required must be strictly observed. In addition,
the leakage reading must be recorded.on the service
repair ticket while in the customer's home.
NOTE: The U.S. government standard is 5 mW/cti while in the customer's
home. 2mW/cm stated here is our own voluntary standard.
(imw/cni for Canada)
1. Equipment
*Electromagnetic radiation monitor
*Glass thermometer 212°F or 100°C
*600cc glass beaker
2. Procedure for measuring radiation leakage.
Note before measuring
(1) Do not exceed meter full scale deflection. Leakage monitor
should
initially
be
set
to
the
highest
scale.
HIGH
VOLTAGE
HIGH
VOLTAGE
(2)
To
prevent
false
readings
the
test
probe
should
be
held
by
the
TRANSFORMER
CAPACITOR
grip
portion
of the
handle only
and
moved
along
the
shaded
area
shown
in
Fig. 43 no
faster
than
1
inch/sec
(2.5 cm/sec)
(3)
Leakage
with
the
outer
panel
removed:-----less
than
5mW/cat
(4) Leakage for a fully assembled oven with door normally closed:-----
less than 2mW/ent (1mW/en' for Canada)
(5)
Leakage
for
a
fully
assembled
oven
[Before
the
latch
switch
(prim-
ary)
is
interrupted]
while
pulling
the
door
------
less
than
2mW/cni
(A) Pour 275 + 15cc (9ozs + 1/20z) of 20 + SC (68 + 9°F) water in a
beaker which is graduated to 600cc, and place the beaker in the
center of the oven.
(B) Set the radiation monitor to 2450MHz and use it following the manu-
facturer’s recommended test procedure to assure correct results.
(C) When measuring the leakage, always use the 2 inch (5cm) spacer
supplied with the probe.
(D) Press the start pad or turn on the timer and with the magnetron oscil-
lating, measure the leakage by holding the probe perpendicular to
the surface being measured.
(1) Measurement with the outer panel removed.
Whenever you replace the magnetron, measure for radiation leakage
before the outer panel is installed and after all necessary components
are replaced or adjusted. Special care should be taken in measuring
around the magnetron. (Fig. 42)
WARNING
SOF
=——,
Fig. 42
Avoid contacting any high voltage parts.
(2) Measurements with a fully assembled oven. (Fig. 43)
After all components, including the outer panel are fully assembled,
measure for radiation leakage around the door periphery, the door
viewing window, the exhaust opening and air inlet openings.
3. Record keeping and notification after measurement
MOVE PROBE ALONG SHADED AREA ( 7 )
(A) After any adjustment or repair to a microwave oven, a leakage read- AROUND EXHAUST OPENINGS (as shown)
ing must be taken. Record this leakage reading on the repair ticket AND AROUND AIR INLET OPENING
even if it is zero. °
A
copy
of
this
repair
ticket
and
the
microwave
leakage
reading
should
Fig.
43
be kept by repair facility.
(B) Should the radiation leakage be more than 2 mW/cmi (1mW/cm for
Canada) after determining that all parts are in good condition, func-
tioning properly, and genuine replacement parts as listed in this
manual have been used, immediately notify the MSC, PHI, PSC or
MELCA.
4. At least once a year, have the radiation monitor
checked for calibration by its manufacturer.