Sharp Carousel R-7A54 Service-Handbuch - Seite 5

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Sharp Carousel R-7A54 Service-Handbuch
SERVICING
WARNING
TO SERVICE
PERSONNEL
Microwave
ovens
contain
circuitry
capable
of producing
very high
voltage
and current,
contact
with
any part
of the high
voltage
circuit
will
result
in electrocuition.
REMEMBER
TO CHECK
3D
I)
Disconnect
the supply.
2)
Door
opened,
and wedaed
open.
3)
Discharge
high
voltage"capa&tor.
WARNING
AGAINST
THE CHARGE
OF THE
HIGH-VOLTAGE
CAPACITOR
The
high-voltage
capacitor
remains
charged
about
60
seconds
after
the
oven
has been
switched
off.
Wait
for 60 seconds
and
then
short-circuit
the
connection
of
the
high-voltage
capacitor
(that
is, of the
con-
necting
lead
of
the
high-voltage
rectifier)
against
the
chassis
with
the use of an insu-
lated screwdriver.
Sharp
recommend
that
wherever
possible
fault-finding
is carried
out with
the supply
discon-
nected.
It may
in,
some
cases,
be
necessary
to
connect
the
supply
after
the
outer
case
has been
removed,
in this event
carry out 3D checks
and then
disconnect
the
leads
to the
primary
of the
power
transformer.
Ensure
that these
leads remain
isolated
from
other
components
and the oven
chassis.
(Use
insulation
tape
if necessary.)
When
the
testing
is
completed
carry
out 3D
checks
and
reconnect
the
leads to the primary
of the power
transformer.
REMEMBER
TO CHECK
+FJ
1)
Reconnect
all leads
removed
from
components
during
testing.
2)
Replace
the outer
case (cabinet).
3)
Reconnect
the supply.
4)
Run the oven.
Check
all functions.
Microwave
ovens
should
not be run empty.
To test
for
the
presence
of
microwave
energy
within
a
cavity,
place
a cup
of
cold
water
on
the
oven
turntable,
close
the
door
and
set the
microwave
timer
for two
(2)
minutes.
Set the
power
level
to
HIGH
and push the START
button.
When
the two
minutes
has elapsed
(timer
at zero)
carefully
check
that the water
is now
hot.
If the water
remains
cold
carry
out
3D
checks
and
re-examine
the
con-
nections
to the component
being
tested.
When
all service
work
is completed,
and the oven
is fully
assembled,
the microwave
power
output
should
be checked
and a microwave
leakage
test carried
out.
(RD81001
H)