Sharp R-216 (serv.man2) Service Manual ▷ View online
R-216(W)
19
switch is in the upper position.
2. Reconnect wire leads to each switch. Refer to chapter
"Pictorial Diagram".
3. Secure latch hook (with two (2) mounting screws) to
oven flange.
4. Reinstall the control panel assembly to the oven cavity
front flange.
5. Reconnect 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.
chapter "Test Procedure", and Adjustment Procedure
below.
Figure C-5. Latch Switch Removal
1. CARRY OUT 3D CHECKS.
If the monitored latch switch, 2nd. interlock relay control
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, 2nd. interlock relay control
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 2nd. interlock relay control 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 2nd. interlock relay control 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)
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)
MONITORED LATCH SWITCH, 2ND. INTERLOCK RELAY CONTROL SWITCH AND
MONITOR SWITCH ADJUSTMENT
should be less than 0.5mm.
2. The monitored latch switch and 2nd. interlock relay
control switch interrupt the circuit before the door can
be opened.
be opened.
3. The monitor switch contacts close when the door is
opened.
4. The contacts of monitored latch switch and 2nd. inter-
lock relay control switch open within 1.6mm gap be-
tween right side of cavity face plate and door when door
is open.
tween right side of cavity face plate and door when door
is open.
5. Reinstall 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-6. Latch Switch Adjustments
Removal
1. Disconnect the power supply cord.
2. Open the door slightly.
3. Insert a putty knife (thickness of about 0.5mm) into the
1. Disconnect the power supply cord.
2. Open the door slightly.
3. Insert a putty knife (thickness of about 0.5mm) into the
gap between the choke cover and corner portion of door
panel as shown in Figure C-7 to free engaging parts.
panel as shown in Figure C-7 to free engaging parts.
4. Pry the choke cover by inserting a putty knife in order
shown in figure C-7.
5. Release choke cover from door panel.
6. Now choke cover is free.
6. Now choke cover is free.
NOTE: When carrying out any repair to the door, do
not bend or warp the slit choke (tabs on the
door panel assembly) to prevent microwave
leakage.
door panel assembly) to prevent microwave
leakage.
DOOR REPLACEMENT
Figure C-7. Door Disassembly
Putty Knife
Door Frame
Choke Cover
6
7
8
9
10
11
12
1
2
3
4
5
Latch Heads
Latch Hook
Door
Monitor
Switch
Switch
Monitored
Latch
Switch
Latch
Switch
2nd. Interlock
Relay Control
Switch
Relay Control
Switch
Latch Hook
Monitor
Switch
Switch
Monitored
Latch
Switch
Latch
Switch
Pole
Pole
Bar
Outward
Outward
Tab
Tab
2nd. Interlock
Relay Control
Switch
Relay Control
Switch
20
R-216(W)
Sealer film
Backing film
Adhesive tape
7. Release two (2) pins of door panel from two (2) holes
of upper and lower oven hinges by lifting up.
8. Now, door panel is free from oven cavity.
9. Release door panel from ten (10) tabs of door frame
9. Release door panel from ten (10) tabs of door frame
and remove door frame by sliding the door panel
downward.
downward.
10.Now, door panel with sealer film is free.
11.Tear sealer film from door panel.
12.Now, door panel is free.
13.Slide latch head upward and remove it from door frame
11.Tear sealer film from door panel.
12.Now, door panel is free.
13.Slide latch head upward and remove it from door frame
with releasing latch spring from door frame and latch
head.
head.
14.Now, latch head and latch spring are free.
15.Remove door screen from door frame.
16.Now, door screen is free.
15.Remove door screen from door frame.
16.Now, door screen is free.
Reinstall
1. Reinstall door screen to door frame.
2. Reinstall latch spring to the head. Reinstall latch spring
1. Reinstall door screen to door frame.
2. Reinstall latch spring to the head. Reinstall latch spring
to the door frame. Reinstall latch head to the door
frame.
frame.
3. Reinstall door panel to door frame by fitting ten (10)
tabs of door frame to ten (10) holes of door panel.
4. Put sealer film on door panel. Refer to "Sealer Film"
and figure C-9, on how to handle the new film.
5. Catch two (2) pins of door panel on two (2) hole of upper
and lower oven hinges.
6. Reinstall choke cover to door panel by pushing.
Note: After any service to the door;
(A) Make sure that monitored latch switch, 2nd. inter-
Note: After any service to the door;
(A) Make sure that monitored latch switch, 2nd. inter-
lock relay control switch and monitor switch are
operating properly. (Refer to chapter "Test Proce-
dures".).
operating properly. (Refer to chapter "Test Proce-
dures".).
(B) An approved microwave survey meter should be
used to assure compliance with proper micro-
wave radiation emission limitation standards.
wave radiation emission limitation standards.
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 centre of
latch hole.
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 Micro-
wave Measurement Procedure.)
wave Measurement Procedure.)
Note:
The door on a microwave oven is designed to act
as an electronic seal preventing the leakage of
microwave energy from oven cavity during cook
cycle. This function does not require that door be
air-tight, moisture (condensation)-tight or light-
tight. Therefore, occasional appearance of mois-
ture, light or sensing of gentle warm air movement
around oven door is not abnormal and do not of
themselves, indicate a leakage of microwave en-
ergy from oven cavity.
as an electronic seal preventing the leakage of
microwave energy from oven cavity during cook
cycle. This function does not require that door be
air-tight, moisture (condensation)-tight or light-
tight. Therefore, occasional appearance of mois-
ture, light or sensing of gentle warm air movement
around oven door is not abnormal and do not of
themselves, indicate a leakage of microwave en-
ergy from oven cavity.
Figure C-8. Door Replacement
SEALER FILM
Installation
1. Put the adhesive tape on the backing film of the sealer
1. Put the adhesive tape on the backing film of the sealer
film as shown in Fig. C-9.
2. Tear the backing film by pulling the adhesive tape.
3. Put the pasted side of the sealer film on the door panel
3. Put the pasted side of the sealer film on the door panel
Figure C-9. Sealer film
Pin
Pin
Lower
Oven
Hinge
Oven
Hinge
Lower Oven
Hinge
Hinge
Upper
Oven
Hinge
Oven
Hinge
Upper Oven
Hinge
Hinge
Door Panel
Choke Cover
Slit choke
R-216(W)
21
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
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.
Dotted line indicates the path taken by the leakage detector.
22
R-216(W)
SCHEMATIC
NOTE: CONDITION OF OVEN
1. DOOR CLOSED.
2. COOKING TIME PROGRAMMED.
1. DOOR CLOSED.
2. COOKING TIME PROGRAMMED.
Figure O-2 Oven Schematic-ON Condition
Figure O-1 Oven Schematic-OFF Condition
NOTE: " " indicates components with potential above 250V.
SCHEMATIC
NOTE: CONDITION OF OVEN
1. DOOR CLOSED.
1. DOOR CLOSED.
HIGH VOLTAGE
TRANSFORMER
MAGNETRON
H.V. RECTIFIER
CAPACITOR
0.91
µ
F
AC2100V
TURNTABLE MOTOR
FAN MOTOR
OVEN LAMP
MONITOR SWITCH
CONTROL
UNIT
THERMAL
CUT-OUT
125˚C (OVEN)
CUT-OUT
125˚C (OVEN)
2ND.
INTERLOCK
RELAY
INTERLOCK
RELAY
2ND. INTERLOCK
RELAY CONTROL
SWITCH
RELAY CONTROL
SWITCH
MONITOED LATCH
SWITCH
SWITCH
A5
A3
OL
FM
TTM
THERMAL
CUT-OUT
95˚C (MG)
CUT-OUT
95˚C (MG)
N.O.
RY-1
COM.
A1
RY-2
EARTH
230 - 240V
˜
50Hz
BLU
BRN
LIVE
NEUTRAL
G-Y
FUSE
T6.3A
N
L
LINE CROSS CAPACITOR
0.068
µ
/AC250V
NOISE SUPPRESSION COIL
LINE BYPASS
CAPACITOR
0.0022
µ
/AC250V
LINE BYPASS
CAPACITOR
0.0022
µ
/AC250V
NOISE FILTER
H.V. FUSE
0.6A
B3
B1
HIGH VOLTAGE
TRANSFORMER
MAGNETRON
H.V. RECTIFIER
CAPACITOR
0.91
µ
F
AC2100V
TURNTABLE MOTOR
FAN MOTOR
OVEN LAMP
MONITOR SWITCH
CONTROL
UNIT
THERMAL
CUT-OUT
125˚C (OVEN)
CUT-OUT
125˚C (OVEN)
2ND.
INTERLOCK
RELAY
INTERLOCK
RELAY
2ND. INTERLOCK
RELAY CONTROL
SWITCH
RELAY CONTROL
SWITCH
MONITOED LATCH
SWITCH
SWITCH
A5
A3
OL
FM
TTM
THERMAL
CUT-OUT
95˚C (MG)
CUT-OUT
95˚C (MG)
N.O.
RY-1
COM.
A1
RY-2
EARTH
230 - 240V
˜
50Hz
BLU
BRN
LIVE
NEUTRAL
G-Y
FUSE
T6.3A
N
L
LINE CROSS CAPACITOR
0.068
µ
/AC250V
NOISE SUPPRESSION COIL
LINE BYPASS
CAPACITOR
0.0022
µ
/AC250V
LINE BYPASS
CAPACITOR
0.0022
µ
/AC250V
NOISE FILTER
H.V. FUSE
0.6A
B3
B1
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