Sharp R-212M (serv.man2) Service Manual ▷ View online
R-212M 21
1. CARRY OUT 3D CHECKS.
2. Disconnect the wire leads from the switches and con-
2. Disconnect the wire leads from the switches and con-
trol panel.
3. Remove the control panel assembly from the oven
cavity front flange. Referring to chapter "CONTROL
PANEL ASSEMBLY REMOVAL".
PANEL ASSEMBLY REMOVAL".
4. Remove the two (2) screw holding the latch hook to the
oven flange.
5. Remove the latch hook assembly from the oven flange.
6. To remove the switch.
6-1. With pushing outward on the tab that is holding the
6. To remove the switch.
6-1. With pushing outward on the tab that is holding the
switch, turn the switch so that the post is an axis.
6-2. Pull out the switch from the latch hook. Do not break
the post or tab of the latch hook.
6-3. Now the switch is free.
Re-install
1. Re-install each switch in its place. The monitored latch
1. Re-install each switch in its place. The monitored latch
switch is in the lower position and the monitor switch is
in the middle position. The stop switch is in the upper
position.
in the middle position. The stop switch is in the upper
position.
2. Re-connect wire leads to each switch. Refer to chapter
“Pictorial Diagram”.
3. Secure latch hook (with two (2) mounting screws) to
oven flange.
4. Re-install the control panel assembly to the oven cavity
front flange.
5. Re-connect wire leads to the control unit. Refer to
chapter “Pictorial Diagram”.
6. Make sure that monitor switch is operating properly and
check continuity of the monitor circuit. Refer to chapter
“Test Procedure”, and Adjustment Procedure below.
“Test Procedure”, and Adjustment Procedure below.
MONITORED LATCH SWITCH, MONITOR SWITCH AND STOP SWITCH ADJUSTMENT
2. The monitored latch switch and stop switch interrupt
the circuit before the door can be opened.
3. The monitor switch contacts (COM-NC) close when the
door is opened.
4. Re-install outer case and check for microwave leakage
around the door with an approved microwave survey
meter. (Refer to Microwave Measurement Procedure.)
meter. (Refer to Microwave Measurement Procedure.)
Figure C-2. Latch Switch Removal
Figure C-3. Latch Switch Adjustments
1. CARRY OUT 3D CHECKS.
If the monitored latch switch, stop switch and monitor
switch do not operate properly due to a misadjustment,
the following adjustment should be made.
2. Loosen the two (2) screws holding the latch hook to the
If the monitored latch switch, stop switch and monitor
switch do not operate properly due to a misadjustment,
the following adjustment should be made.
2. Loosen the two (2) screws holding the latch hook to the
flange of the oven front face.
3. With the door closed, adjust latch hook by moving it
back and forth and up and down. In and out play of the
door allowed by the upper and lower position of the
latch hook should be less than 0.5mm. The horizontal
position of the latch hook should be adjusted so that
the monitor switch is activated with the door closed.
The vertical position of the latch hook should be
adjusted so that the stop switch and the monitored
latch switch are activated with the door closed.
door allowed by the upper and lower position of the
latch hook should be less than 0.5mm. The horizontal
position of the latch hook should be adjusted so that
the monitor switch is activated with the door closed.
The vertical position of the latch hook should be
adjusted so that the stop switch and the monitored
latch switch are activated with the door closed.
4. Secure the screws firmly.
5. Check the operation of all switches. If each switch has
5. Check the operation of all switches. If each switch has
not activated with the door closed, loosen screw and
adjust the latch hook position.
adjust the latch hook position.
After adjustment, make sure of the following.
1. In and out play of the door remains less than 0.5mm
1. In and out play of the door remains less than 0.5mm
when in the latched position. First check upper position
of latch hook, pushing and pulling upper portion of door
toward the oven face. Then check lower portion of the
latch hook, pushing and pulling lower portion of door
toward the oven face. Both results (play in the door)
should be less than 0.5mm.
of latch hook, pushing and pulling upper portion of door
toward the oven face. Then check lower portion of the
latch hook, pushing and pulling lower portion of door
toward the oven face. Both results (play in the door)
should be less than 0.5mm.
Latch hook
Stop switch
Door
Monitor switch
Monitored
latch switch
latch switch
Latch heads
Latch hook
Tab
Stop switch
Monitor switch
Monitored latch switch
Tab
Tab
MONITORED LATCH SWITCH, MONITOR SWITCH AND LATCH SWITCH REMOVAL
R-212M 22
DOOR REPLACEMENT
10
5
4
12
8
7
9
11
3
2
1
Choke Cover
Door Frame
Putty Knife
6
REMOVAL
1. Disconnect the power supply cord.
2. Open the door slightly.
3. Remove the choke cover taking care not to break
1. Disconnect the power supply cord.
2. Open the door slightly.
3. Remove the choke cover taking care not to break
clips by inserting an iron plate (thickness of about
0.5mm) or flat type screw driver to the gap between
the choke cover and door panel as shown Figure C-
4 to free the engaged parts.
0.5mm) or flat type screw driver to the gap between
the choke cover and door panel as shown Figure C-
4 to free the engaged parts.
4. Release choke cover from door panel.
5. Now choke cover is free.
5. Now choke cover is free.
Figure C-4. Door Disassembly
6. Release two (2) pins of door panel from two (2)
holes of upper and lower oven hinges by lifting up.
7. 1. Remove door assy by removing screws (4).
8. Release door panel from tabs of door frame and
8. Release door panel from tabs of door frame and
remove door frame by sliding the door panel down-
ward.
ward.
9. Now, door panel with inner sealer film is free.
10.Tear inner sealer film from door panel.
11.Now, door panel is free.
12.Slide latch head upward and remove it from door
10.Tear inner sealer film from door panel.
11.Now, door panel is free.
12.Slide latch head upward and remove it from door
frame with releasing latch spring from door frame
and latch head.
and latch head.
13.Now, latch head and latch spring are free.
14.Remove Glass Stopper Screw (noting position
14.Remove Glass Stopper Screw (noting position
of stopper) and slide stopper down while lifting
up.
up.
15.Slide glass towards Glass Stopper position and
then down towards the lower edge of the door
frame.
frame.
16. Lift upper edge of glass, which will now be free
from upper clips and remove from lower clips.
17.Refitting is a reversal of the above when refit-
ting, ensure the glass and the glass stopper is
in the original position.
in the original position.
RE-INSTALL
1. Re-install the outer door glass to the door frame
1. Re-install the outer door glass to the door frame
with the glass stopper.
2. Hold the glass stopper with the one (1) screw.
3. Re-install latch spring to the head. Re-install latch
3. Re-install latch spring to the head. Re-install latch
spring to the door frame. Re-install latch head to the
door frame.
door frame.
4. Re-install door panel to door frame by fitting tabs of
door frame to holes of door panel.
5. Put sealer film on door panel. Refer to “Inner Sealer
Film” and figure C-6, on how to handle the new film.
6. Catch two (2) pins of door panel on two (2) hole of
upper and lower oven hinges.
7. Re-install choke cover to door panel by pushing.
Note: After any service to the door;
(A) Make sure that monitored latch switch, stop
Note: After any service to the door;
(A) Make sure that monitored latch switch, stop
switch and monitor switch are operating prop-
erly. (Refer to chapter “Test Procedures”.).
erly. (Refer to chapter “Test Procedures”.).
(B) An approved microwave survey meter should
be used to assure compliance with proper
Figure C-6. Inner Sealer Film
microwave radiation emission limitation stand-
ards.
ards.
After any service, make sure of the following :
1. Door latch heads smoothly catch latch hook through
1. Door latch heads smoothly catch latch hook through
latch holes and that latch head goes through center
of latch hole.
of latch hole.
2. Deviation of door alignment from horizontal line of
cavity face plate is to be less than 1.0mm.
3. Door is positioned with its face pressed toward
cavity face plate.
4. Check for microwave leakage around door with an
approved microwave survey meter. (Refer to Mi-
crowave Measurement Procedure.)
crowave Measurement Procedure.)
Note:
The door on a microwave oven is designed to
act as an electronic seal preventing the leak-
age of microwave energy from oven cavity
during cook cycle. This function does not re-
quire that door be air-tight, moisture (conden-
sation)-tight or light-tight. Therefore, occasional
appearance of moisture, light or sensing of
gentle warm air movement around oven door
is not abnormal and do not of themselves,
indicate a leakage of microwave energy from
oven cavity.
act as an electronic seal preventing the leak-
age of microwave energy from oven cavity
during cook cycle. This function does not re-
quire that door be air-tight, moisture (conden-
sation)-tight or light-tight. Therefore, occasional
appearance of moisture, light or sensing of
gentle warm air movement around oven door
is not abnormal and do not of themselves,
indicate a leakage of microwave energy from
oven cavity.
Figure C-5. Door Replacement
IINNER SEALER FILM
Installation
1. Tear away the backing film.
3. Put the pasted side of the inner sealer film on the
1. Tear away the backing film.
3. Put the pasted side of the inner sealer film on the
door panel.
Pin
Pin
Lower
Oven
Hinge
Oven
Hinge
Lower Oven
Hinge
Hinge
Upper
Oven
Hinge
Oven
Hinge
Upper Oven
Hinge
Hinge
Door Panel
Choke Cover
Door film
Finger tab
Backing film
R-212M 23
MICROWAVE MEASUREMENT
After any repair, the microwave oven must be checked for
microwave leakage to ensure continued safe operation.
BS EN 60335-2-25 specifies that the maximum permitted
leakage with a load of 275 ml is 50 W/m
microwave leakage to ensure continued safe operation.
BS EN 60335-2-25 specifies that the maximum permitted
leakage with a load of 275 ml is 50 W/m
2
(equivalent to 5
mW/cm
2
)
at a distance of 5 cm from the oven.
PREPARATION
The following items are required to carry out this test:-
1. A low form of 600 ml beaker made from an electrically
1. A low form of 600 ml beaker made from an electrically
non-conductive material, such as glass or plastic, with
an inside diameter of approximately 8.5 cm. This must
contain 275
an inside diameter of approximately 8.5 cm. This must
contain 275
±
15 ml of water, at an initial temperature
of 20
±
2˚C.
2. A leakage detector which has been calibrated within
the preceding 12 months to a stand whose accuracy
can be traced to National Physical Laboratory Stand-
ards.
can be traced to National Physical Laboratory Stand-
ards.
Recommended instruments are:
Apollo "XI"
Celtec "A100"
Celtec "A100"
Before commencing the test, check that the leakage
detector is functioning and adjusted according to the
manufacturer's instructions, and any spacers are fitted to
ensure that measurement is taken 5cm from the surface of
the oven.
detector is functioning and adjusted according to the
manufacturer's instructions, and any spacers are fitted to
ensure that measurement is taken 5cm from the surface of
the oven.
PROCEDURE
1. Place the beaker containing the water load in the oven
cavity at the centre of the turntable. The placing of this
standard load in the oven is important, not only to
protect the oven, but also to ensure that any leakage
it is not disguised by too large a load absorbing energy.
standard load in the oven is important, not only to
protect the oven, but also to ensure that any leakage
it is not disguised by too large a load absorbing energy.
2. Close the oven door, and with the power level set to
FULL, turn the oven ON with the timer set for a few
minutes operation. Should the water begin to boil
before the test has been completed, it should be
replaced.
minutes operation. Should the water begin to boil
before the test has been completed, it should be
replaced.
3. As shown in the diagram below, move the probe slowly
(not faster than 2.5 cm/sec.);-
a) around the edge of the door following the gap
b) across the face of the door
c) across any vents in the oven's sides, rear or top
b) across the face of the door
c) across any vents in the oven's sides, rear or top
Dotted line indicates the path taken by the leakage detector.
Whilst the maximum leakage permitted in BS EN 60335-2-25 is 50 W/m
2
(equivalent to 5 mW/cm
2
), it is not normal
to detect any significant leakage, and therefore any detected leakage should be investigated.
R-212M 24
NOTE: " " indicates components with potential above 250V.
SCHEMATIC
NOTE: CONDITION OF OVEN
1. DOOR CLOSED.
2. TIMER OFF.
1. DOOR CLOSED.
2. TIMER OFF.
SCHEMATIC
NOTE: CONDITION OF OVEN
1. DOOR CLOSED.
2. MICROWAVE POWER LEVEL HIGH.
3. TIMER ON.
1. DOOR CLOSED.
2. MICROWAVE POWER LEVEL HIGH.
3. TIMER ON.
Figure O-2 Oven Schematic-ON Condition
Figure O-1 Oven Schematic-OFF Condition
HIGH VOLTAGE
TRANSFORMER
WITH 150˚C THERMOSTAT
IN PRIMARY WINDING
TRANSFORMER
WITH 150˚C THERMOSTAT
IN PRIMARY WINDING
MAGNETRON
H.V. RECTIFIER
H.V. CAPACITOR
0.88µF/ AC2100V
0.88µF/ AC2100V
TURNTABLE MOTOR
FAN MOTOR
OVEN LIGHT
STOP
SWITCH
SWITCH
CONTROL UNIT
OVEN THERMAL
CUT-OUT 125˚C
CUT-OUT 125˚C
MONITORED
LATCH SWITCH
LATCH SWITCH
MONITOR
SWITCH
SWITCH
B2
B1
A5
A1
A3
OL
FM
TTM
N.O.
N.O.
N.C.
RY-1
COM.
N.O.
COM.
RY-2
T1
EARTH
230 - 240V
˜
50Hz
BLU
BRN
LIVE
NEUTRAL
G-Y
F: FUSE
F8A
F8A
N
L
0.22µ/AC250V
680K/ 0.5W
10M/ 0.5W
NOISE SUPPRESSION COIL
0.0033µ/ 250V
0.0033µ/ 250V
NOISE FILTER
sw3
sw1
sw2
HIGH VOLTAGE
TRANSFORMER
WITH 150˚C THERMOSTAT
IN PRIMARY WINDING
TRANSFORMER
WITH 150˚C THERMOSTAT
IN PRIMARY WINDING
MAGNETRON
H.V. RECTIFIER
H.V. CAPACITOR
0.88µF/ AC2100V
0.88µF/ AC2100V
TURNTABLE MOTOR
FAN MOTOR
OVEN LIGHT
STOP
SWITCH
SWITCH
CONTROL UNIT
OVEN THERMAL
CUT-OUT 125˚C
CUT-OUT 125˚C
MONITORED
LATCH SWITCH
LATCH SWITCH
MONITOR
SWITCH
SWITCH
B2
B1
A5
A1
A3
OL
FM
TTM
N.O.
N.O.
N.C.
RY-1
COM.
N.O.
COM.
RY-2
T1
EARTH
230 - 240V
˜
50Hz
BLU
BRN
LIVE
NEUTRAL
G-Y
F: FUSE
F8A
F8A
N
L
0.22µ/AC250V
680K/ 0.5W
10M/ 0.5W
NOISE SUPPRESSION COIL
0.0033µ/ 250V
0.0033µ/ 250V
NOISE FILTER
H.V. RECTIFIER
sw3
sw2
sw1
SCHEMATIC
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