Sharp R-90GCK (serv.man17) Service Manual ▷ View online
31
R-90GCK
Tabs
Screw
Screw
Panel angl
Panel sub assembly
Bottom side of
panel sub assembly
panel sub assembly
CPU unit
6. Remove the two (2) screws holding the panel angle to
the panel sub assembly.
7. Release the panel angle from the two (2) tabs of the
panel sub assembly first.
8. Pull out the panel angle from the panel sub assembly
and remove it.
9. Remove the twenty-two (22) screws holding the CUP
unit to the panel sub assembly.
10.Now, the CPU unit is free.
NOTE: After the panel angle is removed from the
NOTE: After the panel angle is removed from the
panel sub assembly, it is can be found that the
bottom side of the panel sub assembly is
bottom side of the panel sub assembly is
melted and transformed by heat. But it is not
abnormal and no problem to use the oven.
abnormal and no problem to use the oven.
Figure C-6. Panel Angle Removal
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
Standards.
can be traced to National Physical Laboratory
Standards.
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.
32
R-90GCK
Figure O-2. Oven Schematic-Microwave Cooking Condition
SCHEMATIC
NOTE:
CONDITION
OF OVEN
1.
DOOR CLOSED.
2.
COOKING TIME
ENTERED.
3.
"START" KEY
TOUCHED.
Figure O-1. Oven Schematic-OFF Condition
SCHEMATIC
NOTE:
CONDITION OF
OVEN
1.
DOOR CLOSED.
2.
CLOCK APPEARS ON
DISPLAY.
NOTE: "
" indicates components with potential above 250V.
TOP HEATER
THERMAL
CUT-OUT 170˚C
SIDE HEATER
THERMAL
CUT-OUT 150˚C
MONITOR SWITCH
OVEN LAMP
CONTROL UNIT
A8
A6
A4
A3
A2
E1
A1
D9
THERMISTOR
DOOR SENSING SWITCH
PRIMARY
INTERLOCK RELAY
CONTROL SWITCH
DAMPER MOTOR
DAMPER SWITCH
CONVECTION
MOTOR
CONVECTION MOTOR CAPACITOR
TURNTABLE MOTOR
TOP HEATIMG ELEMENT
SIDE HEATIMG ELEMENT
MAGNETRON
HIGH VOLTAGE TRANSFORMER
WITH 160˚C THERMOSTAT
IN PRIMARY WINDING
H.V. RECTIFIER
CAPACITOR
1.07
µ
AC 2300V
B3
B4
RY5
RY6
SECONDARY INTERLOCK SWITCH
(MONITORED LATCH SWITCH)
3RD.
LATCH
SWITCH
SOLID-STATE RELAY
SOLID-STATE RELAY
PRIMARY
INTERLOCK RELAY
230 - 240V
~
50Hz
COM.
COM.
COM.
COM.
C2
C1
N.O.
N.O.
MAGNETRON
TEMPERATURE
FUSE 150˚C
T/C TRANSFORMER
FUSE
20A
B1
B2
E3
E5
C4
C3
B5
B6
D7
D1
D5
D3
FM
OL
TTM
FAN MOTOR
RY1
RY2
FM
RY4
RY3
DM
CM
H.V. USE
0.75A
COM.
FUSE
F10A
N
L
LINE CROSS CAPACITOR 1.0
µ
/AC275V
NOISE SUPPRESSION COIL
LINE BYPASS CAPACITOR
0.0047
µ
/AC250V
LINE BYPASS CAPACITOR
0.0047
µ
/AC250V
RESISTOR 10M 1/2W
RESISTOR 680K 1/2W
EARTH
BLU
BRN
LIVE
NEUTRAL
G-Y
TOP HEATER
THERMAL
CUT-OUT 170˚C
SIDE HEATER
THERMAL
CUT-OUT 150˚C
MONITOR SWITCH
OVEN LAMP
CONTROL UNIT
A8
A6
A4
A3
A2
E1
A1
D9
DAMPER MOTOR
CONVECTION
MOTOR
CONVECTION MOTOR CAPACITOR
TURNTABLE MOTOR
TOP HEATIMG ELEMENT
SIDE HEATIMG ELEMENT
MAGNETRON
HIGH VOLTAGE TRANSFORMER
WITH 160˚C THERMOSTAT
IN PRIMARY WINDING
H.V. RECTIFIER
CAPACITOR
1.07
µ
AC 2300V
B3
B4
RY5
RY6
3RD.
LATCH
SWITCH
SOLID-STATE RELAY
SOLID-STATE RELAY
PRIMARY
INTERLOCK RELAY
230 - 240V
~
50Hz
COM.
COM.
COM.
COM.
C2
C1
N.O.
N.O.
MAGNETRON
TEMPERATURE
FUSE 150˚C
T/C TRANSFORMER
FUSE
20A
B1
B2
E3
E5
C4
C3
B5
B6
D7
D1
D5
D3
FM
OL
TTM
FAN MOTOR
RY1
RY2
FM
RY4
RY3
DM
CM
H.V. USE
0.75A
COM.
FUSE
F10A
N
L
LINE CROSS CAPACITOR 1.0
µ
/AC275V
NOISE SUPPRESSION COIL
LINE BYPASS CAPACITOR
0.0047
µ
/AC250V
LINE BYPASS CAPACITOR
0.0047
µ
/AC250V
RESISTOR 10M 1/2W
RESISTOR 680K 1/2W
EARTH
BLU
BRN
LIVE
NEUTRAL
G-Y
THERMISTOR
DOOR SENSING SWITCH
PRIMARY
INTERLOCK RELAY
CONTROL SWITCH
SECONDARY INTERLOCK SWITCH
(MONITORED LATCH SWITCH)
33
R-90GCK
SCHEMATIC
NOTE:
CONDITION
OF OVEN
1.
DOOR CLOSED.
2.
COOKING TIME
ENTERED.
3.
CONVECTION
TEMPERATURE
SELECTED.
4.
"START" KEY
TOUCHED.
Figure O-3. Oven Schematic-Convection (or Reheat) Cooking Condition
SCHEMATIC
NOTE:
CONDITION
OF OVEN
1.
DOOR CLOSED.
2.
COOKING TIME
ENTERED.
3.
"GRILL" KEY
TOUCHED.
4.
"START" KEY
TOUCHED.
Figure O-4. Oven Schematic-Grill Cooking Condition
TOP HEATER
THERMAL
CUT-OUT 170˚C
SIDE HEATER
THERMAL
CUT-OUT 150˚C
MONITOR SWITCH
OVEN LAMP
CONTROL UNIT
A8
A6
A4
A3
A2
E1
A1
D9
DAMPER MOTOR
CONVECTION
MOTOR
CONVECTION MOTOR CAPACITOR
TURNTABLE MOTOR
TOP HEATIMG ELEMENT
SIDE HEATIMG ELEMENT
MAGNETRON
HIGH VOLTAGE TRANSFORMER
WITH 160˚C THERMOSTAT
IN PRIMARY WINDING
H.V. RECTIFIER
CAPACITOR
1.07
µ
AC 2300V
B3
B4
RY5
RY6
3RD.
LATCH
SWITCH
SOLID-STATE RELAY
SOLID-STATE RELAY
PRIMARY
INTERLOCK RELAY
230 - 240V
~
50Hz
COM.
COM.
COM.
COM.
C2
C1
N.O.
N.O.
MAGNETRON
TEMPERATURE
FUSE 150˚C
T/C TRANSFORMER
FUSE
20A
B1
B2
E3
E5
C4
C3
B5
B6
D7
D1
D5
D3
FM
OL
TTM
FAN MOTOR
RY1
RY2
FM
RY4
RY3
DM
CM
H.V. USE
0.75A
COM.
FUSE
F10A
N
L
LINE CROSS CAPACITOR 1.0
µ
/AC275V
NOISE SUPPRESSION COIL
LINE BYPASS CAPACITOR
0.0047
µ
/AC250V
LINE BYPASS CAPACITOR
0.0047
µ
/AC250V
RESISTOR 10M 1/2W
RESISTOR 680K 1/2W
EARTH
BLU
BRN
LIVE
NEUTRAL
G-Y
THERMISTOR
DOOR SENSING SWITCH
PRIMARY
INTERLOCK RELAY
CONTROL SWITCH
SECONDARY INTERLOCK SWITCH
(MONITORED LATCH SWITCH)
TOP HEATER
THERMAL
CUT-OUT 170˚C
SIDE HEATER
THERMAL
CUT-OUT 150˚C
MONITOR SWITCH
OVEN LAMP
CONTROL UNIT
A8
A6
A4
A3
A2
E1
A1
D9
DAMPER MOTOR
CONVECTION
MOTOR
CONVECTION MOTOR CAPACITOR
TURNTABLE MOTOR
TOP HEATIMG ELEMENT
SIDE HEATIMG ELEMENT
MAGNETRON
HIGH VOLTAGE TRANSFORMER
WITH 160˚C THERMOSTAT
IN PRIMARY WINDING
H.V. RECTIFIER
CAPACITOR
1.07
µ
AC 2300V
B3
B4
RY5
RY6
3RD.
LATCH
SWITCH
SOLID-STATE RELAY
SOLID-STATE RELAY
PRIMARY
INTERLOCK RELAY
230 - 240V
~
50Hz
COM.
COM.
COM.
COM.
C2
C1
N.O.
N.O.
MAGNETRON
TEMPERATURE
FUSE 150˚C
T/C TRANSFORMER
FUSE
20A
B1
B2
E3
E5
C4
C3
B5
B6
D7
D1
D5
D3
FM
OL
TTM
FAN MOTOR
RY1
RY2
FM
RY4
RY3
DM
CM
H.V. USE
0.75A
COM.
FUSE
F10A
N
L
LINE CROSS CAPACITOR 1.0
µ
/AC275V
NOISE SUPPRESSION COIL
LINE BYPASS CAPACITOR
0.0047
µ
/AC250V
LINE BYPASS CAPACITOR
0.0047
µ
/AC250V
RESISTOR 10M 1/2W
RESISTOR 680K 1/2W
EARTH
BLU
BRN
LIVE
NEUTRAL
G-Y
THERMISTOR
DOOR SENSING SWITCH
PRIMARY
INTERLOCK RELAY
CONTROL SWITCH
SECONDARY INTERLOCK SWITCH
(MONITORED LATCH SWITCH)
34
R-90GCK
NOTE: "
" indicates components with potential above 250V.
Figure O-5. Oven Schematic-Dual1 Cooking Condition
SCHEMATIC
NOTE:
CONDITION
OF OVEN
1.
DOOR CLOSED.
2.
COOKING TIME
ENTERED.
3.
"DUAL1" KEY
TOUCHED.
4.
MICROWAVE
POWER LEVEL
SELECTED.
5.
"START" KEY
TOUCHED.
SCHEMATIC
NOTE:
CONDITION
OF OVEN
1.
DOOR CLOSED.
2.
COOKING TIME
ENTERED.
3.
"DUAL2" KEY
TOUCHED.
4.
MICROWAVE
POWER LEVEL
SELECTED.
5.
CONVECTION
TEMPERATURE
SELECTED.
6.
"START" KEY
TOUCHED.
Figure O-6. Oven Schematic-Dual2 Cooking Condition
TOP HEATER
THERMAL
CUT-OUT 170˚C
SIDE HEATER
THERMAL
CUT-OUT 150˚C
MONITOR SWITCH
OVEN LAMP
CONTROL UNIT
A8
A6
A4
A3
A2
E1
A1
D9
DAMPER MOTOR
CONVECTION
MOTOR
CONVECTION MOTOR CAPACITOR
TURNTABLE MOTOR
TOP HEATIMG ELEMENT
SIDE HEATIMG ELEMENT
MAGNETRON
HIGH VOLTAGE TRANSFORMER
WITH 160˚C THERMOSTAT
IN PRIMARY WINDING
H.V. RECTIFIER
CAPACITOR
1.07
µ
AC 2300V
B3
B4
RY5
RY6
3RD.
LATCH
SWITCH
SOLID-STATE RELAY
SOLID-STATE RELAY
PRIMARY
INTERLOCK RELAY
230 - 240V
~
50Hz
COM.
COM.
COM.
COM.
C2
C1
N.O.
N.O.
MAGNETRON
TEMPERATURE
FUSE 150˚C
T/C TRANSFORMER
FUSE
20A
B1
B2
E3
E5
C4
C3
B5
B6
D7
D1
D5
D3
FM
OL
TTM
FAN MOTOR
RY1
RY2
FM
RY4
RY3
DM
CM
H.V. USE
0.75A
COM.
FUSE
F10A
N
L
LINE CROSS CAPACITOR 1.0
µ
/AC275V
NOISE SUPPRESSION COIL
LINE BYPASS CAPACITOR
0.0047
µ
/AC250V
LINE BYPASS CAPACITOR
0.0047
µ
/AC250V
RESISTOR 10M 1/2W
RESISTOR 680K 1/2W
EARTH
BLU
BRN
LIVE
NEUTRAL
G-Y
THERMISTOR
DOOR SENSING SWITCH
PRIMARY
INTERLOCK RELAY
CONTROL SWITCH
SECONDARY INTERLOCK SWITCH
(MONITORED LATCH SWITCH)
TOP HEATER
THERMAL
CUT-OUT 170˚C
SIDE HEATER
THERMAL
CUT-OUT 150˚C
MONITOR SWITCH
OVEN LAMP
CONTROL UNIT
A8
A6
A4
A3
A2
E1
A1
D9
DAMPER MOTOR
CONVECTION
MOTOR
CONVECTION MOTOR CAPACITOR
TURNTABLE MOTOR
TOP HEATIMG ELEMENT
SIDE HEATIMG ELEMENT
MAGNETRON
HIGH VOLTAGE TRANSFORMER
WITH 160˚C THERMOSTAT
IN PRIMARY WINDING
H.V. RECTIFIER
CAPACITOR
1.07
µ
AC 2300V
B3
B4
RY5
RY6
3RD.
LATCH
SWITCH
SOLID-STATE RELAY
SOLID-STATE RELAY
PRIMARY
INTERLOCK RELAY
230 - 240V
~
50Hz
COM.
COM.
COM.
COM.
C2
C1
N.O.
N.O.
MAGNETRON
TEMPERATURE
FUSE 150˚C
T/C TRANSFORMER
FUSE
20A
B1
B2
E3
E5
C4
C3
B5
B6
D7
D1
D5
D3
FM
OL
TTM
FAN MOTOR
RY1
RY2
FM
RY4
RY3
DM
CM
H.V. USE
0.75A
COM.
FUSE
F10A
N
L
LINE CROSS CAPACITOR 1.0
µ
/AC275V
NOISE SUPPRESSION COIL
LINE BYPASS CAPACITOR
0.0047
µ
/AC250V
LINE BYPASS CAPACITOR
0.0047
µ
/AC250V
RESISTOR 10M 1/2W
RESISTOR 680K 1/2W
EARTH
BLU
BRN
LIVE
NEUTRAL
G-Y
SECONDARY INTERLOCK SWITCH
(MONITORED LATCH SWITCH)
THERMISTOR
DOOR SENSING SWITCH
PRIMARY
INTERLOCK RELAY
CONTROL SWITCH
Click on the first or last page to see other R-90GCK (serv.man17) service manuals if exist.