Sharp R930cs Service Manual

29
R-930CS
(1) Structure of Absolute Humidity Sensor
The absolute humidity sensor includes two thermistors
as shown in the illustration. One thermistor is housed in
the closed vessel filled with dry air while another in the
open vessel. Each sensor is provided with the protective
cover made of metal mesh to be protected from the
external airflow.
(2) Operational Principle of Absolute Humidity Sensor
The figure below shows the basic structure of an absolute
humidity sensor. A bridge circuit is formed by...

30
R-930CS
1. Precautions for Handling Electronic Components
This unit uses CMOS LSI in the integral part of the circuits.
When handling these parts, the following precautions should
be strictly followed. CMOS LSI have extremely high imped-
ance at its input and output terminals. For this reason, it is
easily influenced by the surrounding high voltage power
source, static electricity charge in clothes, etc. and some-
times it is not fully protected by the built-in protection circuit.
In order to protect...

31
R-930CS
To remove the outer case, proceed as follows.
1. Disconnect the power supply cord.
2. Open the oven door and block it open.
3. Remove the two (2) screws from the lower portion of the
rear cabinet using a T20H Torx type or GTXH20-100
screw driver.4. Remove the remaining two (2) screws from rear and one
(1) screw along the right side of outer case.
5. Slide the entire outer case back out about 1 inch (3 cm)
to free it from retaining clips on the cavity face plate.
6. Lift entire outer case from...

32
R-930CS
1. Disconnect the power supply cord and then remove
outer case.
2. Open the oven door and block it open.
3. Discharge high voltage capacitor.
4. Disconnect the high voltage wire leads and rectifier
HIGH VOLTAGE CAPACITOR REMOVAL HIGH VOLTAGE RECTIFIER ASSEMBLY REMOVAL
5. Disconnect the rectifier assembly from the capacitor and
magnetron.
CAUTION: WHEN REPLACING THE SILICON RECTIFIER
ASSEMBLY, THE GROUND SIDE TERMINAL
MUST BE SECURED FIRMLY WITH A
GROUNDING SCREW. 1. Disconnect the power supply...

33
R-930CS
1. Disconnect the power supply cord.
2. Remove the turntable tray, and the turntable support out
of the oven cavity.
3. Turn the oven upside down and remove one (1) screw
holding the turntable motor cover to the base plate and
take off the turntable motor cover.
TURNTABLE MOTOR REMOVAL
4. Disconnect wire lead from the turntable motor.
5. Remove the two (2) screws holding the turntable motor
and coupling mounting plate to the oven cavity bottom.
6. Turntable motor, Coupling mounting plate and...

34
R-930CS
CONTROL PANEL ASSEMBLY AND CONTROL UNIT REMOVAL
To remove the control panel, procedure as follows:
1. Disconnect the power supply cord and then remove
outer case.
2. Open the oven door and block it open.
3. Discharge high voltage capacitor.
4. Disconnect connector CN-A, CN-E and CN-F from the
control unit.
5. Disconnect the wire leads from the relays RY1, RY2 and
RY3.
6. Remove one (1) screw holding the control panel back
plate to the chassis support.
7. Remove two (2) screws holding the...

35
R-930CS
DOOR SENSING SWITCH/SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH REMOVAL
1. Disconnect the power supply cord and then remove
outer case.
2. Open the oven door and block it open.
3. Discharge high voltage capacitor.
4. Remove the control panel assembly, refer to Control
Panel Removal.
5. Disconnect wire leads from each of the switches and
fuse holder.
6. Remove two (2) screws holding latch hook to oven
flange.
7. Remove latch hook assembly from oven flange.
8. Push outward on the one (1)...

36
R-930CS
RE-INSTALL
RE-INSTALL
LOWER OVEN HINGEUPPER OVEN HINGE
DOOR ASSEMBLY
LATCH
HEADS
DOOR REPLACEMENT AND ADJUSTMENT
REMOVAL
1. Disconnect the power supply cord and then remove
outer case.
2. Open the oven door and block it open.
3. Discharge high voltage capacitor.
4. Remove turntable tray and turntable support from oven
cavity.
5. Remove three (3) screws holding lower oven hinge.
6. Remove the lower oven hinge from oven cavity bottom
flange.
7. Remove door assembly from upper oven hinge on the...

37
R-930CS
Remove door assembly, refer to Door Replacement.
Replacement of door components are as follows:
CHOKE COVER
1. Place door assembly on a soft cloth with latches facing
up.
Note: As the engaging part of choke cover and door panel
are provided at several places, do not force any particular
part.
2. Insert an putty knife (thickness of about 0.5mm) into the
gap between the choke cover and corner portion of door
panel as shown Figure C-6 to free engaging parts.
3. Lift up choke cover.
4. Now choke...

38
R-930CS
6
45
12
3
6
45
12
3 A
B
C
D
E
F
G
HA
B
C
D
E
F
G
H
Figure S-1. Pictorial Diagram
TURNTABLE 
MOTOR
GRY
BRN ORG
GRN
RED BLK
DAMPER 
MOTORCOOLING
FAN 
MOTOR
REDBLK OVEN
THERMAL
CUT-OUT MAGNETRON
TEMPERATURE
FUSE
GRY
IC-1
RED1 2 3 4 5 6
PNK
RED
GRN
WHTPPL1
2
3
4
5
6
7
8
9ORG
RY1 RY2 RY3 CN-FCN-E
CN-ACN-A
N.O.
COM COM
CN-E
ORG
BLK BLKAH SENSOR
RED
WHT 1
2
3CN-F
SECONDARY
INTERLOCK
SWITCH
G
R
Y

CONTROL PANEL
HEATING
ELEMENT MONITOR
SWITCH
CONVECTION MOTOR
POWER SUPPLY CORD
120V...