View Sharp R-752M (serv.man2) Service Manual online
will result in electrocution.
High voltage capacitor, High voltage transformer, Magnetron, High voltage rectifier assembly, High voltage harness.
3) Reconnect the supply.
4) Run the oven. Check all functions.
the presence of microwave energy within a cavity, place
a cup of cold water on the oven turntable, close the door
and set the power to HIGH and set the microwave timer
for two (2) minutes. 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 connections to the component being tested.
2) Door opened, and wedged open.
3) Discharge high voltage capacitor.
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 connecting lead of the high-voltage recti-
fier) against the chassis with the use of an insu-
is carried out with the supply disconnected. 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.
and a microwave leakage test carried out.
trained service engineers.
voltages more than 250V.
are damaged, loosened or removed.
microwave energy which may radiate from the
magnetron or other microwave generating de-
vices if it is improperly used or connected. All
input and output microwave connections,
waveguides, flanges and gaskets must be se-
cured. Never operate the device without a micro-
wave energy absorbing load attached. Never
look into an open waveguide or antenna while the
device is energized.
detect any significant leakage, and therefore any detected leakage should be investigated.
GREEN-AND-YELLOW : EARTH BLUE : NEUTRAL BROWN : LIVE
Grill cooking 1.25 kW Approx. 5 A
Dual cooking 2.75 kW Approx. 12 A
(measured by way of IEC 705) Operating frequency of 2450 MHz
Timer (0-99 minutes 90 seconds)
Microwave Power for Variable Cooking Repetition Rate;
MEDIUM HIGH approx. 70% of Full Power
MEDIUM approx. 50% of Full Power
MEDIUM LOW approx. 30% of Full Power
LOW ... approx. 10% of Full Power
When the oven door is closed, the monitor switch contacts
COM - NC must be open.
come to the following condition.
monitored latch switch SW1 remain closed, the fuse F8A
3. When cooking in dual mode the microwave power is
STOP SWITCH SW3
to open, the fuse F8A blows simultaneously with
closing the contacts (COM-NC) of the monitor
LATCH SWITCH SW1, MONITOR
details of how to carry out this
procedure can be found in the Sharp Technical Training notes which is available from
Sharp Parts Centre
(part number SERV-LITMW01).
be used to establish the actual/rated output power. If the true output power is
required, then the IEC-705 test method must be used.
water temperature as T2.
R.F. Power Output = (T2 - T1) x 70.
adjustment, following the procedure described in the Sharp Technical Training notes
(part number SERV-LITMW01). The maximum leakage permitted in BS EN 60335-2-
25 is 50W/m
Physical Laboratories are used.