In the interest of user-safety the oven should be restored to its original condition and
only parts identical to those specified should be used.
This is a supplemental Service Manual for Models R-310A K, R-330A K and R-330AW.
This supplemental service manual is mainly described the touch control panel parts information for the ovens from
January 1997 production. Use this supplemental manual together with the Base Model Service Manual (Refer No.
is S8605R330APK/) for complete operation, service information, etc..
TABLE OF CONTENTS
Page
PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICE TO
AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY ...................INSIDE FRONT COVER
BEFORE SERVICING ......................................................................................................INSIDE FRONT COVER
FOREWORD.....................................................................................................................INSIDE FRONT COVER
TEST PROCEDURE ..............................................................................................................................................1
TOUCH CONTROL PANEL ASSEMBLY ..............................................................................................................3
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ..................................................................9
POWER UNIT CIRCUIT ......................................................................................................................................11
CPU UNIT CIRCUIT ............................................................................................................................................13
PRINTED WIRING BOARD OF POWER UNIT ...................................................................................................15
PARTS LIST FOR CONTROL PANEL ................................................................................................................16
INFORMATION FOR PARTS CHANGING ..........................................................................................................17
SHARP ELECTRONICS CORPORATION
Service Headquarters: Sharp Plaza, Mahwah, New Jersey 07430-2135
Page 2
R-310AK
R-330AK
R-330AW
SERVICE MANUAL
MICROWAVE OVEN
R-310AK/ R-330AK/ R-330AW
FOREWORD
This Manual has been prepared to provide Sharp Electronics Corp. Service Personnel with Operation and Service
Information for the SHARP MICROWAVE OVENS, R-310AK, R-330AK, R-330AW.
It is recommended that service personnel carefully study the entire text of this manual so that they will be qualified to render
satisfactory customer service.
Check the interlock switches and the door seal carefully. Special attention should be given to avoid electrical shock and
microwave radiation hazard.
This supplemental service manual contains update information only. Please refer to base model service manual
(Refer No. is S8605R330APK/) for complete service information.
PRECAUTIONS TO BE OBSERVED BEFORE AND
DURING SERVICING TO AVOID POSSIBLE
EXPOSURE TO EXCESSIVE MICROWAVE ENERGY
(a) Do not operate or allow the oven to be operated with the door open.
(b) Make the following safety checks on all ovens to be serviced before activating the magnetron or other
microwave source, and make repairs as necessary: (1) interlock operation, (2) proper door closing, (3) seal
and sealing surfaces (arcing, wear, and other damage), (4) damage to or loosening of hinges and latches, (5)
evidence of dropping or abuse.
(c) Before turning on microwave power for any service test or inspection within the microwave generating
compartments, check the magnetron, wave guide or transmission line, and cavity for proper alignment,
integrity, and connections.
(d) Any defective or misadjusted components in the interlock, monitor, door seal, and microwave generation and
transmission systems shall be repaired, replaced, or adjusted by procedures described in this manual before
the oven is released to the owner.
(e) A microwave leakage check to verify compliance with the Federal Performance Standard should be performed
on each oven prior to release to the owner.
BEFORE SERVICING
Before servicing an operative unit, perform a microwave emission check as per the Microwave Measurement
Procedure outlined in this service manual.
If microwave emissions level is in excess of the specified limit, contact SHARP ELECTRONICS CORPORATION immediately @1-800-237-4277.
If the unit operates with the door open, service person should 1) tell the user not to operate the oven and
2) contact SHARP ELECTRONICS CORPORATION and Food and Drug Administration's Center for
Devices and Radiological Health immediately.
Service personnel should inform SHARP ELECTRONICS CORPORATION of any certified unit found with
emissions in excess of 4mW/cm2. The owner of the unit should be instructed not to use the unit until the oven
has been brought into compliance.
Page 3
PROCEDURE
LETTER
JTOUCH CONTROL PANEL ASSEMBLY TEST
R-310AK
R-330AK
R-330AW
TEST PROCEDURES
COMPONENT TEST
The touch control panel consists of circuits including semiconductors such as LSI, ICs, etc. Therefore,
unlike conventional microwave ovens, proper maintenance cannot be performed with only a voltmeter
and ohmmeter.
In this service manual, the touch control panel assembly is divided into two units, Control Unit and Key
Unit, and also the Control Unit is divided into two units, CPU Unit and Power Unit, and troubleshooting
by replacement is described according to the symptoms indicated.
1. Key Unit. Note : Check key unit ribbon connection before replacement.
The following symptoms indicate a defective key unit. Replace the key unit.
a) When touching the pads, a certain pad produces no signal at all.
b) When touching a number pad, two figures or more are displayed.
c) When touching the pads, sometimes a pad produces no signal.
2. Control Unit
The following symptoms indicate a defective control unit. Before replacing the control unit, perform
the Key unit test (Procedure K) to determine if control unit is faulty.
2-1 In connection with pads.
a) When touching the pads, a certain group of pads do not produce a signal.
b) When touching the pads, no pads produce a signal.
2-2 In connection with indicators
a) At a certain digit, all or some segments do not light up.
b) At a certain digit, brightness is low.
c) Only one indicator does not light.
d) The corresponding segments of all digits do not light up; or they continue to light up.
e) Wrong figure appears.
f) A certain group of indicators do not light up.
g) The figure of all digits flicker.
2-3 Other possible problems caused by defective control unit.
a) Buzzer does not sound or continues to sound.
b) Clock does not operate properly.
c) Cooking is not possible.
Note: When defective components, the Power Unit or Key Unit are replaced, the defective part or parts
must be properly packed for return in the shipping carton, with its cushion material, in which the
new replacement part was shipped to you.
LRELAY TEST
Remove the outer case and check voltage between Pin No. 3 of the 2 pin connector (A) and the common
terminal of the relay RY2 on the control unit with an A.C. voltmeter.
The meter should indicate 120 volts, if not check oven circuit.
RY1 and RY2 Relay Test
These relays are operated by D.C. voltage
Check voltage at the relay coil with a D.C. voltmeter during the microwave cooking operation.
DC. voltage indicated ............. Defective relay.
DC. voltage not indicated ........ Check diode which is connected to the relay coil. If diode is good, control
RY1Approx. 24.5V D.C.Approx. 14.0 D.C.Oven lamp / Turntable motor / Cooling fan motor
RY2Approx. 24.0V D.C.Approx. 12.8 D.C.Power transformer
unit is defective.
R-330AK/AWR-310AK
1
Page 4
R-310AK
R-330AK
R-330AW
PROCEDURE
LETTER
NPROCEDURES TO BE TAKEN WHEN THE FOIL PATTERN ON THE PRINTED WIRING BOARD
TEST PROCEDURES
COMPONENT TEST
(PWB) IS OPEN
To protect the electronic circuits, this model is provided with a fine foil pattern added to the primary on the
PWB, this foil pattern acts as a fuse. If the foil pattern is open, follow the troubleshooting guide given
below for repair.
Problem: POWER ON, indicator does not light up.
STEPSOCCURRENCECAUSE OR CORRECTION
1The rated AC voltage is not present betweenCheck supply voltage and oven power cord.
Pin No. 3 of the 2-pin connector (A) and the
common terminal of the relay RY2.
2The rated AC voltage is present at primaryLow voltage transformer or secondary circuit defective.
side of low voltage transformer.Check and repair.
3Only pattern at "a" is broken.*Insert jumper wire J1 and solder.
4Pattern at "a" and "b" are broken.*Insert the coil RCILF2003YAZZ between "c" and "d".
XH
CN - A
VH
3
3
NOTE:*At the time of making these repairs,
make a visual inspection of the varistor.
Check for burned damage and examine the transformer with a tester for the
presence of layer short-circuit (check
the primary coil resistance which is approximately 212Ω± 10% (for R-330AK/
AW), 563Ω± 10% (for R-310AK)). If
any abnormal condition is detected,
replace the defective parts.
c
(J1)
a
b
d
(COM)
AC
HVT
RY2
2
Page 5
TOUCH CONTROL PANEL ASSEMBLY
OUTLINE OF TOUCH CONTROL PANEL
R-310AK
R-330AK
R-330AW
The touch control section consists of the following units.
(1) Key Unit
(2) Control Unit (The Control Unit consists of Power Unit and
CPU Unit).
The principal functions of these units and the signals communicated among them are explained below.
Key Unit (R-330AK/AW)
The key unit is composed of a matrix, signals generated in
the LSI are sent to the key unit through P20 - P27.
When a key pad is touched, a signal is completed through
the key unit and passed back to the LSI through P74 - P77
to perform the function that was requested.
Key Unit (R-310AK)
The key unit is composed of a matrix, signals generated in
the LSI are sent to the key unit through P73, P81, P82, P83,
P90 and P91
.
When a key pad is touched, a signal is completed through
the key unit and passed back to the LSI through P60 - P63
to perform the function that was requested.
Control Unit
Control unit consists of LSI, ACL circuit, indicator circuit,
power source circuit, relay circuit, buzzer circuit, synchronizing signal circuit, absolute humidity sensor circuit and back
light circuit.
2) Indicator Circuit (R-310AK)
This circuit consists of 12 segments and 3 common electrodes using a Liquid Crystal Display.
3) Power Source Circuit
This circuit generates voltages necessary in the control
unit from the AC line voltage.
In addition, the synchronizing signal is available in order to
compose a basic standard time in the clock circuit.
SymbolVoltageApplication
VC-5.3VLSI(IC1)
4) Relay Circuit
A circuit to drive the magnetron, fan motor, turntable motor
and light the oven lamp.
5) Buzzer Circuit
The buzzer is responsive to signals from the LSI to emit
audible sounds (key touch sound and completion sound).
6) Synchronizing Signal Circuit
The power source synchronizing signal is available in order
to compose a basic standard time in the clock circuit.
It accompanies a very small error because it works on
commercial frequency.
7) Door Sensing Switch
A switch to “tell” the LSI if the door is open or closed.
1) ACL
This circuit generates a signal which resets the LSI to the
initial state when power is supplied.
2) Indicator Circuit (R-330AK/AW)
This circuit consists of 25 segments and 4 common electrodes using a Liquid Crystal Display.
8) Back Light Circuit
A circuit to drive the back light (Light emitting diodes LD1LD5).
9) Absolute Humidity Sensor Circuit (R-330AK/AW)
This circuit detects moisture of the cooking food to allow its
automatic cooking.
3
Page 6
R-310AK
A
B
0.1 sec.
2 sec.
H : GND
L : -5V
H : GND
L : -5V
R-330AK
R-330AW
DESCRIPTION OF LSI
LSI(IZA757DR) : R-330AK/AW
The I/O signal of the LSI(IZA757DR) is detailed in the following table.
Pin No.SignalI/ODescription
1C1INTerminal not used.
2VL1IN
Power source voltage input terminal.
Standard voltage for LCD.
3-6AN7-AN4IN
Terminal to change cooking constant according to the Model.
By using the A/D converter contained in the LSI, DC voltage in accordance with the Model
in operation is applied to set up its cooking constant.
7AN3OUTTerminal not used.
8AN2IN
To input signal which communicates the door open/close information to LSI.
Door closed; “H” level signal (0V).
Door opened; “L” level signal (-5V).
9AN1IN
AH sensor input.
This input is an analog input terminal from the AH sensor circuit, and connected to the A/D
converter built into the LSI.
10AN0INUsed for initial balancing of the bridge circuit (absolute humidity sensor). This input is an
analog input terminal from the AH sensor circuit, and connected to the A/D converter built into
the LSI.
11-13P57-P55OUTTerminal not used.
14P54OUT
Signal to sound buzzer (2.0KHz).
A: key touch sound.
B: Completion sound.
15-18P53-P50OUTTerminal not used.
19-23P47-P43OUTUsed for initial balancing of the bridge circuit (absolute humidity sensor).
24INT0IN
Signal synchronized with commercial power source frequency.
This is basic timing for time processing of LSI.
16.7 msec.
H : GND
L : -5V
25-26P41-P40OUTTerminal not used.
27P77IN
Signal coming from touch key.
When either G12 line on key matrix is touched, a corresponding signal out of P20 - P27 will
be input into P77. When no key is touched, the signal is held at “H” level.
28P76IN
Signal similar to P77.
When either G11 line on key matrix is touched, a corresponding signal will be input into P76.
29P75IN
Signal similar to P77.
When either G10 line on key matrix is touched, a corresponding signal will be input into P75.
30P74IN
Signal similar to P77.
When either G9 line on key matrix is touched, a corresponding signal will be input into P74.
31P73OUT
32P72OUT
Oven lamp, fan motor and turntable motor driving signal.
To turn on and off shut off relay (RY1). The
16.7 msec.
square waveform voltage is delivered to the
RY1 driving circuit and RY2 control circuit.
Magnetron high-voltage circuit driving signal.
To turn on and off the cook relay (RY2). The
signals holds “L” level during microwave cook-
ing and “H” level while not cooking. In other
cooking modes (variable cooking) the signal
turns to “H” level and “L” level in repetition
according to the power level.
OFF
P-HI
OFFOFF
P-70
4
During cooking
ON
24 sec.
ON
8 sec.
H : GND
L : -5V
H : GND
L : -5V
H : GND
L : -5V
Page 7
Pin No.SignalI/ODescription
33P71OUTTerminal not used.
34P70INConnected to VC.
35RESETIN
Auto clear terminal.
Signal is input to reset the LSI to the initial state when power is applied. Temporarily set to
“L” level the moment power is applied, at this time the LSI is reset. Thereafter set at “H” level.
36-37P81-P80OUTTerminal not used.
38XININ
Internal clock oscillation frequency input setting.
The internal clock frequency is set by inserting the ceramic filter oscillation circuit with
respect to XIN terminal.
39XOUTOUT
Internal clock oscillation frequency control output.
Output to control oscillation input of XOUT.
40VSSIN
Power source voltage : -5.1V.
VC voltage of power source circuit input.
41P27OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P74 - P77 terminal while one
of G8 line keys on key matrix is touched.
42P26OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P74 - P77 terminal while one
of G7 line keys on key matrix is touched.
43P25OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P74 - P77 terminal while one
of G6 line keys on key matrix is touched.
44P24OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P74 - P77 terminal while one
of G5 line keys on key matrix is touched.
45P23OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P74 - P77 terminal while one
of G4 line keys on key matrix is touched.
46P22OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P74 - P77 terminal while one
of G3 line keys on key matrix is touched.
47P21OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P74 - P77 terminal while one
of G2 line keys on key matrix is touched.
48P20OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P74 - P77 terminal while one
of G1 line keys on key matrix is touched.
49-50P17-P16OUTTerminal not used.
51-62
63-66
SEG39-SEG28 OUTTerminal not used.
SEG27-SEG24 OUTSegment data signal.Connected to LCD.
The relation between signals are as follows:
LSI signal (Pin No.)LCD (Pin No.) LSI signal (Pin No.)LCD (Pin No.)
SEG 27 (63) ........................ S0SEG 12 (78).......................... S5
SEG 26 (64) ........................ S1SEG 11 (79).......................... S6
SEG 25 (65) ........................ S2SEG 10 (80).......................... S7
SEG 24 (66) ........................ S3SEG 9 (81)........................... S8
SEG 22 (68) ........................ S4SEG 8 (82)........................... S9
SEG 21 (69) ...................... S26SEG 6 (84)......................... S10
SEG 20 (70) ...................... S25SEG 5 (85)......................... S11
SEG 19 (71) ...................... S24SEG 4 (86)......................... S12
SEG 18 (72) ...................... S23SEG 3 (87)......................... S13
SEG 17 (73) ...................... S22SEG 2 (88)......................... S14
SEG 16 (74) ...................... S21SEG 1 (89)......................... S15
SEG 14 (76) ...................... S20SEG 0 (90)......................... S16
SEG 13 (77) ...................... S19
5
R-310AK
R-330AK
R-330AW
Page 8
R-310AK
R-330AK
R-330AW
Pin No.SignalI/ODescription
67SEG23OUTTerminal not used.
68-74
SEG22-SEG16OUTSegment data signal.
Signal similar to SEG27.
75SEG15OUTTerminal not used.
76-82
SEG14-SEG8OUTSegment data signal.
Signal similar to SEG27.
83SEG7OUTTerminal not used.
84-90
SEG6-SEG0OUTSegment data signal.
Signal similar to SEG27.
91/92
VCC/VREFINConnected to GND.
93AVSSINConnected to VC.
94COM3OUT
Common data signal: COM3.
Connected to LCD (Pin No. C0).
95COM2OUT
Common data signal: COM2.
Connected to LCD (Pin No. C1).
96COM1OUT
Common data signal: COM1.
Connected to LCD (Pin No. C2).
97COM0OUT
Common data signal: COM0.
Connected to LCD (Pin No. C3).
98-99VL3-VL2IN
Power source voltage input terminal.
Standard voltage for LCD.
100C2INTerminal not used.
LSI(IZA758DR) : R-310AK
The I/O signal of the LSI(IZA758DR) is detailed in the following table.
Pin No.SignalI/ODescription
1-12
SEG0-SEG11OUTSegment data signal.
Connected to LCD.
The relation between signals are as follows:
LSI signal (Pin No.)LCD (Pin No.)LSI signal (Pin No.)LCD (Pin No.)
SEG 0 (1) ...................................S12SEG 6 (7) ....................................S6
SEG 1 (2) ...................................S11SEG 7 (8) ....................................S5
SEG 2 (3) ...................................S10SEG 8 (9) ....................................S4
SEG 3 (4) .....................................S9SEG 9 (10) ..................................S3
SEG 4 (5) .....................................S8SEG 10 (11) ................................S2
SEG 5 (6) .....................................S7SEG 11(12) .................................S1
13R60IN
Signal coming from touch key.
When either G12 line on key matrix is touched, a corresponding signal out of R73, R81-R83
and R90-R91 will be input into R60. When no key is touched, the signal is held at "H" level.
14R61IN
Signal similar to R60.
When either G11 line on key matrix is touched, a corresponding signal will be input into R61.
15R62IN
Signal similar to R60.
When either G10 line on key matrix is touched, a corresponding signal will be input into R62.
16R63IN
Signal similar to R60.
When either G9 line on key matrix is touched, a corresponding signal will be input into R63.
17AIN0IN
To input signal which communicates the door open/close information to LSI.
Door close "H" level signal (0V). Door open "L" level (-5V)
18-20
AIN1-AIN3INTerminal to change functions according to the Model.
By using the A/D converter contained in the LSI, DC voltage in accordance with the Model
in operation is applied to set up its function.
level and "L" level in repetition according to the
power level.
23PULSEOUT
Signal to sound buzzer (2.0 kHz).
A: key touch sound.
B: Completion sound.
24R72OUT
Oven lamp, fan motor and turntable motor driving signal
To turn on and off shut off relay (RY1). The
square waveform voltage is delivered to the
RY1 driving circuit and RY2 control circuit.
R-310AK
R-330AK
R-330AW
OFF
P-HI
OFFOFF
P-70
ON
ON
24 sec.
8 sec.
H : GND
L : -5V
H : GND
L : -5V
(ON and OFF times for other power level.)
0.1 sec.
A
2 sec.
B
H : GND
L : -5V
H : GND
L : -5V
25R73OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to R60 - R63 terminal while one
of G8 line keys on key matrix is touched.
26INT2IN
Signal synchronized with commercial power source frequency.
This is the basic timing for time processing of LSI.
27R81OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to R60 - R63 terminal while one
of G7 line keys on key matrix is touched.
28R82OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to R60 - R63 terminal while one
of G6 line keys on key matrix is touched.
29R83OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to R60 - R63 terminal while one
of G5 line keys on key matrix is touched.
30R90OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to R60 - R63 terminal while one
of G4 line keys on key matrix is touched.
31R91OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to R60 - R63 terminal while one
of G3 line keys on key matrix is touched.
32R92OUTTerminal not used.
33XININ
Internal clock oscillation frequency setting input.
The internal clock frequency is set by inserting the capacitor and resistor circuit with respect
to XOUT terminal.
34XOUTOUT
Internal clock oscillation frequency control output.
Output to control oscillation input of XIN.
35RESETIN
Auto clear terminal.
Signal is input to reset the LSI to the initial state when power is supplied. Temporarily set "L"
level the moment power is supplied, at this time the LSI is reset. Thereafter set at "H" level.
36HOLDIN/OUT Connected to GND.
37VLCIN
Signal synchronized with commercial power source frequency.
Signal similar to VSS.
38COM1OUT
Common data signal: COM1.
Connected to LCD (Pin No. C1)
39COM2OUT
Common data signal: COM2.
Connected to LCD (Pin No. C2)
7
Page 10
R-310AK
R-330AK
R-330AW
Pin No.SignalI/ODescription
40COM3OUTCommon data signal: COM1.
Connected to LCD (Pin No. C3)
41COM4OUTTerminal not used.
42VDDIN
Power source voltage input terminal.
Connected to GND.
ABSOLUTE HUMIDITY SENSOR CIRCUIT (R-330AK/AW)
(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.
ventilation opening for sensing
Sensing part
(Open vessel)
Thermistors
Sensing part
(Closed vessel)
(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 two thermistors
and two resistors (R1 and R2).
The output of the bridge circuit is to be amplified by the
operational amplifier.
Each thermistor is supplied with a current to keep it heated
at about 150˚C (302˚F), the resultant heat is dissipated in
the air and if the two thermistors are placed in different
humidity conditions they show different degrees of heat
conductivity leading to a potential difference between them
causing an output voltage from the bridge circuit, the
intensity of which is increased as the absolute humidity of
the air increases. Since the output is very minute, it is
amplified by the operational amplifier.
Absolute humidity vs,
R1
R2
Operational
amplifier
+
-
S : Thermistor
open vessel
C : Thermistor
closed vessel
Output
voltage
Output voltage
C
S
R3
output voltage characterist
Absolute humidity (g/m )
2
(3) Detector Circuit of Absolute Humidity Sensor Circuit
This detector circuit is used to detect the output voltage of
the absolute humidity circuit to allow the LSI to control
sensor cooking of the unit. When the unit is set in the sensor
cooking mode, 16 seconds clearing cycle occurs than the
detector circuit starts to function and the LSI observes the
initial voltage available at its AN1 terminal.
With this voltage given, the switches SW1 to SW5 in the LSI
are turned on in such a way as to change the resistance
values in parallel with R107 ~ R111. Changing the resistance
values results in that there is the same potential at both F3 terminal of the absolute humidity sensor and AN0 terminal
of the LSI. The voltage of AN1 terminal will indicate about
-2.5V. This initial balancing is set up about 16 seconds after
the unit is put in the Sensor Cooking mode. As the sensor
cooking proceeds, the food is heated to generate moisture
by which the resistance balance of the bridge circuit is
deviated to increase the voltage available at AN1 terminal
of the LSI.
Then the LSI observes that voltage at AN1 terminal and
compares it with its initial value, and when the comparison
rate reaches the preset value (fixed for each menu to be
cooked), the LSI causes the unit to stop sensor cooking;
thereafter, the unit goes in the next operation automatically.
When the LSI starts to detect the initial voltage at AN1
terminal 16 seconds after the unit has been put in the
Sensor Cooking mode, if it is not possible to balance, of the
bridge circuit due to disconnection of the absolute humidity
sensor, ERROR will appear on the display and the cooking
is stopped.
1) Absolute humidity sensor circuit
C. Thermistor in
closed vesssl
S. Thermistor in
open vessel
F-1
C
F-3
3.57k
S
F-2
VA : -15V
R112
R105
3.32k
R90
C101
1.8k
R107
R108
R109
R110
R111
R106
0.1
R101
uF
37.4k
47k
C103
+
IC2
-
VA : -15V
620k
300k
150k
75k
R102
360k
0.01uF
C102
0.015uF
R103
10k
VC : -5V
R104
47k
0.01uF
C104
D101
SW1
19
R47
SW2
20
R46
SW3
21
R45
SW4
22
R44
SW5
23
R43
10
AN0
LSI
(IC1)
9
AN1
8
Page 11
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE
CAUTION: DISCONNECT OVEN FROM POWER SUPPLY BEFORE REMOVING OUTER CASE.
DISCHARGE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPONENTS OR WIRING
AFTER REMOVING OUTER CASE.
CONTROL PANEL ASSEMBLY REMOVAL
R-310AK
R-330AK
R-330AW
1. Disconnect oven from power supply and remove outer
case.
2. Discharge high voltage capacitor.
3. Disconnect wire leads from the door sensing switch and the
oven cavity front flange.
4. Disconnect the wire leads from panel components.
5. Make one (1) tab of the oven cavity front plate straight
holding the control panel assembly to the oven flange.
6. Slide the control panel assembly upward and remove it.
7. Now, individual components can be removed.
NOTE: 1. Before attaching a new key unit, wipe off remaining
adhesive on the control panel frame surfaces
completely with a soft cloth soaked in alcohol.
2. When attaching the key unit to the control panel
frame, adjust the upper edge and right edge of
the key unit to the correct position of control panel
frame.
3. Stick the key unit firmly to the control panel frame
by rubbing with soft cloth not to scratch.
CPU UNIT AND POWER UNIT
NOTE: When soldering the CPU unit and the power unit, make
sure both the CPU unit and power unit are parallel, as
shown figure C-9.
CPU unit
Connector
Solder
These should be parallel
Power unit
Figure C-9. Side view of CPU unit and Power unit
Handle the CPU unit carefully so that the ribbon cable
does not come off. Because the ribbon cable is sticked
on the LCD and the printed wiring board only by heated
paste.
Ribbon cable
Liquid Crystal
Display (LCD)
of CPU unit
Printed wiring board
Figure C-10. CPU unit
WARNING FOR WIRING
To prevent an electric shock, take the following manners.
1. Before wiring,
1) Disconnect the power supply.
2) Open the door and wedge the door open.
3) Discharge the high voltage capacitor and wait for 60 seconds.
2. Don’t let the wire leads touch to the following parts;
1) High voltage parts:
Magnetron, High voltage transformer, High voltage capacitor and High voltage rectifier assembly.
2) Hot parts:
Oven lamp, Magnetron, High voltage transformer and Oven cavity.
3) Sharp edge:
Bottom plate, Oven cavity, Weveguide flange, Chassis support and other metallic plate.
4) Movable parts (to prevent a fault)
Fan blade, Fan motor, Switch, Switch lever, Open button.
3. Do not catch the wire leads in the outer case cabinet.
4. Insert the positive lock connector certainly until its pin is locked. And make sure that the wire leads should not come off
even if the wire leads is pulled.
5. To prevent an error function, connect the wire leads correctly, referring to the Pictorial Diagram.
9
Page 12
R-310AK
R-330AK
R-330AW
1
A
BLKBLK
B
OVEN
THERMAL CUT-OUT
C
2
GRN
N
H
BLK
NOTE:
The grounding conductor of
the power supply cord has
been grounded by power
supply cord fixing screw.
The screw must allways be
kept tight.
OUTER CASE
SWITCH (Upper)
N.O.
BLK
WHT
COM.
BLK
3
NOTE:
The neutral (WHT) wire must be
connected to the terminal with "N"
mark on the power supply cord.
POWER SUPPLY
CORD 120V 60Hz
N.O.
COM.
OUTER CASE
SWITCH (Lower)
WHT
WHT
WHT
45
RECTIFIER
H.V.
HIGH VOLTAGE
MAGNETRON
HIGH VOLTAGE COMPONENTS
RED
GRY
GRY
CAPACITOR
POWER
TRANSFORMER
6
A
B
C
D
BLK
WHT
OVEN LAMP
AND SOCKET
E
Hot (BLK) wire must be
NOTE:
F
GRY
N.O.
DOOR
SENSING
SWITCH
G
AH SENSOR ( for R-330AK/AW only)
BLUE MARK
THERMAL CUT-OUT (MG.)
connected to the terminal
with blue mark on the
oven light socket.
GRN
COM.
GRY
BLK
GRN
BLK
CN-A
BLK
1
D
BLK
BLK
GRY
WHT
BLK
BLK
WHT
FAN MOTOR
TURNTABLE
MOTOR
BLK
2
3 WHT
&
FUSE
HOLDER
BLK
RY2 (COM)
BLK
RED
RED
RY2 (N.O.)
RED
WHT
N.C.
COM.
WHT
NO
MONITOR
SWITCH
SECONDARY
GRY
WHT
COM.
INTERLOCK
SWITCH
WHT
one "FW-VZB572WRE0" and both wire harness are
interchangeable.
NOTE: The parts number of the main wire harness is the same as old
E
Figure S-1. Pictorial Diagram
F
G
BLK
RED
WHT
CN-F
123
H
CONTROL UNIT
1
R-330AK/AW
CN-G
CN-F
IC1
1 2 3
SH-A
SH-B
RY1
2
RY2
T1
PRIMARY
INTERLOCK
RELAY
N.O.
1
CN-A
3
COM.
CONTROL UNIT
3
10
SH-A
R-310AK
CN-G
IC1
SH-B
RY1
RY2
T1
PRIMARY
INTERLOCK
RELAY
N.O.
CN-A
1
3
COM.
45
H
6
Page 13
R-310AK
R-330AK
R-330AW
1
A
B
AC
C
D
2
A 3
VRS1
a
b
d
c
1
2
(J1)
3
D1-D4
T1
11ES1
3
D3
4
D4
VR
RY1
LD1-LD5
D1
D2
45
LD1 LD2 LD3 LD4 LD5
WH-1
V
R
R4 27
D5
C1 0.1µ/50v
D6
+
–
Q2 2SA933
R5 4.7k
C2 1000µ/25v
R3 910 1/2w
SP1
C 1
C 2
C 3
C 4
C 5
6
A
B
C
D
TURNTABLE
MOTOR
OVEN LAMP
FAN
MOTOR
E
MICRO
AC
F
G
A 1
N.O.
COM
RY2
D7
R6 3.3k
C 6
C 7
D8
E
C 8
C 9
Q3 KRC243M
F
SH-B
B 1
+
C5
10µ/35v
–
B 2
SH-A
G
J2
VR
H
1
NOTE
Figure S-2(a). Power Unit Circuit (R-310AK)
2
: IF NOT SPECIFIED, 1/4w ± 5%
: IF NOT SPECIFIED, 1SS270A
3
45
11
H
6
Page 14
R-310AK
R-330AK
R-330AW
1
A
B
AC
C
D
2
A 3
VRS1
a
b
d
c
1
2
(J1)
3
T1
3
D3
4
D4
V
R
RY1
D1-D4
11ES1
LD1-LD5
D1
D2
45
LD1 LD2 LD3 LD4 LD5
WH-1
R
V
R4 27
D5
C1 0.1µ/50v
D6
+
–
Q2 2SB1238
R5 4.7k
ZD1
R1 2.4k
C2 1000µ/35v
HZ16-1
Q1
C3 0.1µ/50v
+
–
C4 10µ/35v
R3 510
2SB1238
R2 680 1/2w
SP1
C 1
C 2
C 3
1/2w
C 4
C 5
6
A
B
C
D
TURNTABLE
MOTOR
OVEN LAMP
FAN
MOTOR
E
MICRO
AC
F
G
A 1
N.O.
COM
RY2
D7
R6 3.3k
C 6
C 7
E
D8
C 8
C 9
Q3 KRC243M
F
SH-B
B 1
+
C5
10µ/35v
–
B 2
SH-A
G
J2
V
R
H
1
NOTE
Figure S-2(b). Power Unit Circuit (R-330AK/AW)
2
: IF NOT SPECIFIED, 1/4w ± 5%
: IF NOT SPECIFIED, 1SS270A
Outer case cabinet (R330AW)
Foot
Foot
Leg
Control Panel Parts
Cushion
Cushion
MG. air guide
Cushion
Sensor mounting angle
Cushion
Cushion
Door assembly
Door assembly
Screw
Cushion
Screw
Instruction book
Screw
Screw
Screw
Screw
CONTROL PANEL, DOOR AND MISCELLANEEOUS PARTS FOR R-330AK/AW
3-7
A
3-1F
3-4
3-7
3-7
5-11
B
3-3-1
C
D
3-5
3-2
3-3
3-6
5-2
5-5
3-1
5-8
6
A
B
C
5
D
5-9
E
F
G
6-3
H
5-3
5-10
5-4
5-1
6-4
5-6
5-7
(HIGH VOLTAGE TRANSFORMER)
E
F
G
(CAPACITOR)
H
Actual wire harness may be different from illustration.
1
2
6-5
3
22
45
'97 SHARP CORP. (1K4.160E) Printed in U.S.A
6
Page 25
SER VICE MANU AL
S8605R330APK/
MICROWAVE OVEN
R-310AK
R-330AK
R-330AW
MODELS
R-310AK
R-330AK
R-330AW
R-330AW
TABLE OF CONTENTS
PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICE TO
AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY ...................INSIDE FRONT COVER
BEFORE SERVICING ...........................................................................................................................................1
GENERAL INFORMATION................................................................................................................................... 4
TEST PROCEDURE ............................................................................................................................................11
TOUCH CONTROL PANEL .................................................................................................................................17
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ................................................................24
CONTROL PANEL CIRCUIT ...............................................................................................................................31
PARTS LIST FOR R-310AK ................................................................................................................................35
PACKING AND ACCESSORIES FOR R-310AK .................................................................................................39
PARTS LIST FOR R-330AK/AW .........................................................................................................................40
PACKING AND ACCESSORIES FOR R-330AK/AW ..........................................................................................45
In the interest of user-safety the oven should be restored to its original
condition and only parts identical to those specified should be used.
Page
SHARP ELECTRONICS CORPORATION
Service Headquarters: Sharp Plaza, Mahwah, New Jersey 07430-2135
Page 26
R-310AK
R-330AK
R-330AW
PRECAUTIONS TO BE OBSERVED BEFORE AND
DURING SERVICING TO AVOID POSSIBLE
EXPOSURE TO EXCESSIVE MICROWAVE
ENERGY
(a) Do not operate or allow the oven to be operated with the door open.
(b) Make the following safety checks on all ovens to be serviced before activating the magnetron or other
microwave source, and make repairs as necessary: (1) interlock operation (2) proper door closing, (3)
seal and sealing surfaces (arcing, wear, and other damage), (4) damage to or loosening of hinges and
latches, (5) evidence of dropping or abuse.
(c) Before turning on microwave power for any service test or inspection within the microwave generating
compartments, check the magnetron, wave guide or transmission line, and cavity for proper alignment,
integrity, and connections.
(d) Any defective or misadjusted components in the interlock, monitor, door seal, and microwave
generation and transmission systems shall be repaired, replaced, or adjusted by procedures described
in this manual before the oven is released to the owner.
(e) A microwave leakage check to verify compliance with the Federal Performance Standard should be
performed on each oven prior to release to the owner.
R-310AK
Page 27
BEFORE SERVICING
Before servicing an operative unit, perform a microwave emission check as per the Microwave
Measurement Procedure outlined in this service manual.
If microwave emissions level is in excess of the specified limit, contact SHARP ELECTRONICS
CORPORATION immediately @1-800-237-4277.
If the unit operates with the door open, service person should 1) tell the user not to operate the oven
and 2) contact SHARP ELECTRONICS CORPORATION and Food and Drug Administration's
Center for Devices and Radiological Health immediately.
Service personnel should inform SHARP ELECTRONICS CORPORATION of any certified unit found
with emissions in excess of 4mW/cm2. The owner of the unit should be instructed not to use the unit
until the oven has been brought into compliance.
R-310AK
R-330AK
R-330AW
1
Page 28
R-310AK
R-330AK
R-330AW
MICROWAVE MEASUREMENT PROCEDURE
A. Requirements:
1) Microwave leakage limit (Power density limit): The power density of microwave radiation emitted by a microwave oven
should not exceed 1mW/cm2 at any point 5cm or more from the external surface of the oven, measured prior to acquisition
by a purchaser, and thereafter (through the useful life of the oven), 5 mW/cm2 at any point 5cm or more from the external
surface of the oven.
2) Safety interlock switches Primary interlock relay and door sensing switch shall prevent microwave radiation emission in
excess of the requirement as above mentioned, secondary interlock switch shall prevent microwave radiation emission
in excess of 5 mW/cm2 at any point 5cm or more from the external surface of the oven.
B. Preparation for testing:
Before beginning the actual measurement of leakage, proceed as follows:
1) Make sure that the actual instrument is operating normally as specified in its instruction booklet.
Important:
Survey instruments that comply with the requirement for instrumentation as prescribed by the performance standard
for microwave ovens, 21 CFR 1030.10(c)(3)(i), must be used for testing.
2) Place the oven tray in the oven cavity.
3) Place the load of 275±15 ml (9.8 oz) of tap water initially at 20±5˚C (68˚F) in the center of the oven cavity.
The water container shall be a low form of 600 ml (20 oz) beaker with an inside diameter of approx. 8.5 cm (3-1/2 in.)
and made of an electrically nonconductive material such as glass or plastic.
The placing of this standard load in the oven is important not only to protect the oven, but also to insure that any leakage
is measured accurately.
4) Set the cooking control on Full Power Cooking Mode
5) Close the door and select a cook cycle of several minutes. If the water begins to boil before the survey is completed,
replace it with 275 ml of cool water.
C. Leakage test:
Closed-door leakage test (microwave measurement)
1) Grasp the probe of the survey instrument and hold it perpendicular to the gap between the door and the body of the oven.
2) Move the probe slowly, not faster than 1 in./sec. (2.5 cm/sec.) along the gap, watching for the maximum indication on
the meter.
3) Check for leakage at the door screen, sheet metal seams and other accessible positions where the continuity of the metal
has been breached (eg., around the switches, indicator, and vents).
While testing for leakage around the door pull the door away from the front of the oven as far as is permitted by the closed
latch assembly.
4) Measure carefully at the point of highest leakage and make sure that the highest leakage is no greater than 4mW/cm2,
and that the secondary interlock switch does turn the oven OFF before any door movement.
NOTE: After servicing, record data on service invoice and microwave leakage report.
2
Page 29
SERVICE MANUAL
MICROWAVE OVEN
PRODUCT DESCRIPTION
R-310AK
R-330AK
R-330AW
R-310AK / R-330AK / R-330AW
FOREWORD
This Manual has been prepared to provide Sharp Electronics
Corp. Service Personnel with Operation and Service Information for the SHARP MICROWAVE OVENS, R-310AK, R330AK, R-330AW.
It is recommended that service personnel carefully study the
entire text of this manual so that they will be qualified to render
satisfactory customer service.
Check the interlock switches and the door seal carefully.
Special attention should be given to avoid electrical shock and
microwave radiation hazard.
GENERAL INFORMATION
OPERATION
TROUBLESHOOTING GUIDE AND
TEST PROCEDURE
TOUCH CONTROL PANEL
COMPONENT REPLACEMENT
AND ADJUSTMENT PROCEDURE
WIRING DIAGRAM
SHARP ELECTRONICS CORPORATION
SHARP PLAZA, MAHWAH,
NEW JERSEY 07430-2135
PARTS LIST FOR R-310AK
PARTS LIST FOR R-330AK/AW
3
Page 30
R-310AK
R-330AK
R-330AW
SPECIFICATION
ITEMDESCRIPTION
Power Requirements120 Volts / 13.0 Amperes
60 Hertz
Single phase, 3 wire grounded
Power Output 1000 watts (IEC-705 TEST PROCEDURE)
Operating frequency of 2450MHz
Case DimensionsWidth 20-1/2"
Height 11-7/8"
Depth 15-7/8"
Cooking Cavity DimensionsWidth 13-3/4"
Height 8-3/8"
0.9 Cubic FeetDepth 14-7/8"
Control ComplementTouch Control System
Microwave Power for Variable Cooking
Repetition Rate;
P-HI..................................................Full power throughout the cooking time
P-90 ....................................................................approx. 90% of Full Power
P-80 ....................................................................approx. 80% of Full Power
P-70 ....................................................................approx. 70% of Full Power
P-60 ....................................................................approx. 60% of Full Power
P-50 ....................................................................approx. 50% of Full Power
P-40 .....................................................................approx. 40% of Full Power
P-30 .....................................................................approx. 30% of Full Power
P-20 ....................................................................approx. 20% of Full Power
P-10 .....................................................................approx. 10% of Full Power
P-0 .................................................... No power throughout the cooking time
R-330AK/ R-330AWR-310AK
CUSTOM HELP padINSTANT ACTION pads
COMPU DEFROST padCOMPU DEFROST pad
INSTANT SENSOR padNumber selection pads
MINUTE PLUS padPOWER LEVEL pad
COMPU COOK padTIMER/CLOCK pad
SNACKS & REHEAT padSTOP/CLEAR pad
Number selection padsSTART/MINUTE PLUS pad
POWER LEVEL pad
CLOCK pad
KITCHEN TIMER pad
STOP/CLEAR pad
START/TOUCH ON pad
DHHS Rules, CFR, Title 21, Chapter 1, Subchapter J
GENERAL INFORMATION
GROUNDING INSTRUCTIONS
This oven is equipped with a three prong grounding plug. It must be plugged into a wall receptacle that is properly installed
and grounded in accordance with the National Electrical Code and local codes and ordinances.
In the event of an electrical short circuit, grounding reduces the risk of electric shock by providing an escape wire for the
electric current.
WARNING: Improper use of the grounding plug can result in a risk of electric shock.
4
Page 31
R-310AK
R-330AK
R-330AW
Electrical Requirements
The electrical requirements are a 115 -120 volt 60 Hz, AC only,
15 or 20 amp. fused electrical supply. It is recommended that a separate
3-Pronged Plug
Grounded
Receptacle Box
circuit serving only this appliance be provided. When installing this
appliance, observe all applicable codes and ordinances.
A short power-supply cord is provided to reduce risks of becoming
entangled in or tripping over a longer cord.
Where a two-pronged wall-receptacle is encountered, it is the personal
responsibility and obligation of the customer to contact a qualified
Grounding Pin
electrician and have it replaced with a properly grounded three-pronged
wall receptacle or have a grounding adapter properly grounded and
polarized. If an extension cord must be used, it should be a 3-wire, 15
3-Pronged Receptacle
amp. or more cord. Do not drape over a countertop or table where it can
be pulled on by children or tripped over accidentally.
CAUTION: DO NOT UNDER ANY CIRCUMSTANCES CUT OR REMOVE THE ROUND GROUNDING PRONG FROM
THIS PLUG
1. One touch door open button.
Push to open door.
2. Door latches.
The oven will not operate unless the
door is securely closed.
3. Removable turntable support.
4. Removable turntable.
The turntable will rotate clockwise or
counterclockwise.
5. Oven lamp.
It will light when oven is operating.
6. Oven door with see-through window.
7. Ventilation openings. (Rear)
8. Auto-Touch control panel.
9. Time display: Digital display, 99 minutes 99 seconds.
10.Coupling.
11.Wave guide cover.
12.Power supply cord
OVEN DIAGRAM
10
11
2
TOUCH CONTROL PANEL
56
7
9
8
12
1
4
3
COOKLBSSENSORKG DEF HELP
FROZEN
DINNER
RICE
FRESH VEG
SOFT
GROUND
MEAT
COMPU
DEFROST
CLOCK
CUSTOM
HELP
REHEAT
SOUP
FROZEN
VEG
HOT
DOG
MINUTE
PLUS
KITCHEN
TIMER
START
TOUCH ON
Interactive
Smart & Easy Sensor Cooking
POPCORN
BAKED
POTATO
FRESH VEG
HARD
FISH,
SEAFOOD
COMPU
COOK
12345
12345
6789O
6789O
POWER
LEVEL
STOP
CLEAR
Interactive Display:
Words will light in the display to
indicate features and cooking
instructions. Always follow the
instructions.
DEF.LBS.QTY.
ON
INSTANT ACTION
To adjust quantity-touch pad again
POPCORN
DINNER
PLATE
BAKED
POTATO
FRESH
ROLL / MUFFIN
Ground meat
1
Steaks / chops
2
Chicken pieces
3
POWER
LEVEL
STOP
CLEAR
BEVERAGE
REHEAT
CASSEROLE
FRESH
VEGETABLE
FROZEN
ROLL / MUFFIN
COMPU
DEFROST
CLOCK
START
MINUTE PLUS
CHECK
TIMER
Time display
Indicator
R-33AK/ R-330AWR-310AK
5
Page 32
R-310AK
R-330AK
R-330AW
OPERATION
DESCRIPTION OF OPERATING SEQUENCE
The following is a description of component functions during
oven operation.
OFF CONDITION
Closing the door activates door sensing switch and secondary interlock switch. (In this condition, the monitor switch
contacts are opened.)
When oven is plugged in, 120 volts A.C. is supplied to the
control unit. (Figure O-1).
for R-330AK and R-330AW
1. The display will show , , ,
, , , and
.
To set any program or set the clock, you must first touch
the STOP/CLEAR pad. The display will clear, and " : "
will appear.
for R-310AK
1. The display will show flashing "88:88".
To set any program or set the clock, you must first touch
the STOP/CLEAR pad. The display will clear, and " : "
will appear.
COOKING CONDITION
Program desired cooking time by touching the NUMBER
pads. Program the power level by touching the POWER
LEVEL pad and then a Number pad.
When the START pad is touched, the following operations
occur:
1. The contacts of relays are closed and components
connected to the relays are turned on as follows.
(For details, refer to Figure O-2)
RELAYCONNECTED COMPONENTS
RY-1oven lamp/turntable motor/fan motor
RY-2power transformer
2. 120 volts A.C. is supplied to the primary winding of the
power transformer and is converted to about 3.2 volts
A.C. output on the filament winding, and approximately
2150 volts A.C. on the high voltage winding.
3. The filament winding voltage heats the magnetron
filament and the H.V. winding voltage is sent to a voltage
doubler circuit.
4. The microwave energy produced by the magnetron is
channelled through the waveguide into the cavity feedbox, and then into the cavity where the food is placed to
be cooked.
5. Upon completion of the cooking time, the power
transformer, oven lamp, etc. are turned off, and the
generation of microwave energy is stopped. The oven
will revert to the OFF condition.
6. When the door is opened during a cook cycle, monitor
switch, door sensing switch, secondary interlock switch
and primary interlock relay are activated with the following
results. The circuits to the oven lamp, turntable motor,
the cooling fan motor, and the high voltage components
are de-energized, and the digital read-out displays the
time still remaining in the cook cycle when the door was
opened.
7. The monitor switch electrically monitors the operation of
the secondary interlock switch and primary interlock
relay and is mechanically associated with the door so
that it will function in the following sequence.
(1) When the door opens from the closed position, the
primary interlock relay and secondary interlock switch
open their contacts. Then the monitor switch contacts
close.
(2) When the door is closed from the open position, the
monitor switch contacts open first. Then the contacts of
the secondary interlock switch and primary interlock
relay close.
If the secondary interlock switch and primary interlock relay
fail with the contacts closed when the door is opened, the
closing of the monitor switch contacts will form a short circuit
through the monitor fuse, secondary interlock switch and
primary interlock relay, causing the monitor fuse to blow.
POWER LEVEL P-0 TO P-90 COOKING
When Variable Cooking Power is programmed, the 120
volts A.C. is supplied to the power transformer intermittently
through the contacts of relay (RY-2) which is operated by the
control unit within a 32 second time base. Microwave power
operation is as follows:
VARI-MODEON TIMEOFF TIME
Power 10(P-HI)32 sec.0 sec.
(100% power)
Power 9(P-90)30 sec.2 sec.
(approx. 90% power)
Power 8(P-80)26 sec.6 sec.
(approx. 80% power)
Power 7(P-70)24 sec.8 sec.
(approx. 70% power)
Power 6(P-60)22 sec.10 sec.
(approx. 60% power)
Power 5(P-50)18 sec.14 sec.
(approx. 50% power)
Power 4(P-40)16 sec.16 sec.
(approx. 40% power)
Power 3(P-30)12 sec.20 sec.
(approx. 30% power)
Power 2(P-20) 8 sec.24 sec.
(approx. 20% power)
Power 1(P-10) 6 sec.26 sec.
(approx. 10% power)
Power 0(P-0) 0 sec.32 sec.
(0% power)
Note: The ON/OFF time ratio does not correspond with
the percentage of microwave power, because
approx. 2 seconds are needed for heating of the
magnetron filament.
SENSOR COOKING CONDITION (for R-330AK/AW)
Using the INSTANT SENSOR function, the foods are
6
Page 33
cooked without figuring time, power level or quantity. When
the oven senses enough steam from the food, it relays the
information to its microprocessor which will calculate the
remaining cooking time and power level needed for best
results. When the food is cooked, water vapor is developed.
The sensor “senses” the vapor and its resistance increases
gradually. When the resistance reaches the value set according to the menu, supplementary cooking is started.
The time of supplementary cooking is determined by experiment with each food category and inputted into the LSI.
An example of how sensor works: (SOUP)
1. Soup at room temperature. Vapor is emitted very slowly.
MICROWAVE
2. Heat Soup. Moisture and humidity is emitted rapidly. You
can smell the aroma as it cooks.
SENSOR
MICROWAVE
R-310AK
R-330AK
R-330AW
3. Sensor detects moisture and humidity and calculates
cooking time and variable power.
Cooking Sequence.
1. Touch one of the INSTANT SENSOR pads.
NOTE: The oven should not be operated on INSTANT
SENSOR immediately after plugging in the unit.
Wait five minutes before cooking on INSTANT
SENSOR.
2. The coil of shut-off relay (RY-1) is energized, the turntable
motor, oven lamp and cooling fan motor are turned on,
but the power transformer is not turned on.
3. After about 16 seconds, the cook relay (RY-2) is
energized. The power transformer is turned on,
microwave energy is produced and first stage is started.
The 16 seconds is the cooling time required to remove
any vapor from the oven cavity and sensor.
NOTE: During this first stage, do not open the door or touch
STOP/CLEAR pad.
4. When the sensor detects the vapor emitted from the
food, the display switches over to the remaining cooking
time and the timer counts down to zero.
At this time, the door may be opened to stir, turn, or
season food.
5. When the timer reaches zero, an audible signal sounds.
The shut-off relay and cook relay are de-energized and
the power transformer, oven lamp, etc. are turned off.
6. Opening the door or touching the STOP/CLEAR pad, the
time of day will reappear on the display and the oven will
revert to an OFF condition.
SCHEMATIC
NOTE: CONDITION OF OVEN
1. DOOR CLOSED
2. CLOCK APPEARS ON DISPLAY
OUTER CASE
SWITCH
120V AC
60 Hz
OUTER CASE
SWITCH
MONITOR
FUSE
THERMAL
CUT-OUT (OVEN)
A3
CONTROL UNIT
OLFM
OVEN
LAMP
SECONDARY
INTERLOCK
SWITCH
THERMAL
CUT-OUT (MG.)
(RY-1)
TTM
TURN-
TABLE
MOTOR
This Circuit is only for R-330AK and R-330AW.
These outer case switches will be used from Oct.
1996 production.
COM.
(RY-2)
PRIMARY
INTERLOCK
RELAY
BA
DOOR
SENSING
SWITCH
FAN
MOTOR
N.O.
F3
F2
F1
MONITOR
SWITCH
AH SENSOR
POWER
TRANSFORMER
CAPACITOR
0.94µF
RECTIFIER
MAGNETRON
Figure O-1. Oven Schematic-Off Condition
7
Page 34
R-310AK
R-330AK
R-330AW
SCHEMATIC
NOTE: CONDITION OF OVEN
1. DOOR CLOSED
2. COOKING TIME PROGRAMMED
3. VARIABLE COOKING CONTROL "HIGH"
4. "START" PAD TOUCHED
This Circuit is only for R-330AK and R-330AW.
These outer case switches will be used from Oct.
1996 production.
120V AC
60 Hz
OUTER CASE
SWITCH
OUTER CASE
SWITCH
A3
THERMAL
CUT-OUT (OVEN)
CONTROL UNIT
MONITOR
FUSE
OLFM
OVEN
LAMP
SECONDARY
INTERLOCK
SWITCH
THERMAL
CUT-OUT (MG.)
(RY-1)
TTM
TURN-
TABLE
MOTOR
COM.
(RY-2)
PRIMARY
INTERLOCK
RELAY
BA
DOOR
SENSING
SWITCH
FAN
MOTOR
N.O.
F3
F2
F1
MONITOR
SWITCH
Figure O-2. Oven Schematic-Cooking Condition
AH SENSOR
POWER
TRANSFORMER
CAPACITOR
0.94µF
RECTIFIER
MAGNETRON
DESCRIPTION AND FUNCTION OF COMPONENTS
DOOR OPEN MECHANISM
The door is opened by pushing the open button on the
control panel, refer to the Figure D-1.
When the open button is pushed, the open button pushes up
the switch lever, and then the switch lever pushes up the
latch head. The latch heads are moved upward and released from latch hook. Now the door will open.
Door
Latch Hook
Latch
Heads
Switch
Lever
Figure D-1. Door Open Mechanism
Door
Sensing
Switch
Monitor
Switch
Secondary
Interlock
Switch
DOOR SENSING AND SECONDARY INTERLOCK
SWITCHES
The secondary interlock switch is mounted in the lower
position of the latch hook and the door sensing switch in the
primary interlock system is mounted in the upper position of
the latch hook. They are activated by the latch heads on the
door. When the door is opened, the switches interrupt the
circuit to all components. A cook cycle cannot take place
until the door is firmly closed thereby activating both interlock switches. The primary interlock system consists of the
door sensing switch and primary interlock relay located on
the control circuit board.
MONITOR SWITCH
The monitor switch is activated (the contacts opened) by the
latch head on the door while the door is closed. The switch
is intended to render the oven inoperative, by means of
blowing the monitor fuse, when the contacts of the primary
interlock relay and secondary interlock switch fail to open
when the door is opened.
Functions:
1. When the door is opened, the monitor switch contact
close (to the ON condition) due to their being normally
closed. At this time the primary interlock relay and
8
Page 35
secondary interlock switch are in the OFF condition
(contacts open) due to their being normally open contact
switches.
2. As the door goes to a closed position, the monitor switch
contacts are first opened and then the door sensing
switch and the secondary interlock switch contacts close.
(On opening the door, each of these switches operate
inversely.)
3. If the door is opened, and the primary interlock relay and
secondary interlock switch contacts fail to open, the
monitor fuse blows simultaneously with closing of the
monitor switch contacts.
CAUTION: BEFORE REPLACING A BLOWN MONITOR
FUSE TEST THE DOOR SENSING SWITCH,
PRIMARY INTERLOCK RELAY, SECONDARY
INTERLOCK SWITCH AND MONITOR
SWITCH FOR PROPER OPERATION. (REFER TO CHAPTER "TEST PROCEDURE").
NOTE: MONITOR FUSE AND MONITOR SWITCH ARE
REPLACED AS AN ASSEMBLY.
OUTER CASE SWITCHES (For the ovens from Oct.
1996 production)
The two outer case switches are mounted near the power
supply cord at the oven cavity rear plate. When the outer
case cabinet is installed with the screws, one of the screws
pushes the actuator and then the actuator pushes the two
plungers of outer case switches and their contacts are
closed. When a cabinet mounting screw which is pushing
the actuator is removed, the two outer case switches interrupt the circuit to the all components.
OUTER CASE
CABINET
OUTER CASE
SWITCHES
This outer case mounting screw is pushing the actuator.
ACTUATER
R-310AK
R-330AK
R-330AW
TURNTABLE MOTOR
The turntable motor rotates the turntable located on the
bottom of the oven cavity, so that the foods on the turntable
cook evenly during cooking. The turntable may turn in either
direction.
COOLING FAN MOTOR
The cooling fan motor drives a blade which draws external
cool air. This cool air is directed through the air vanes
surrounding the magnetron and cools the magnetron. This
air is channelled through the oven cavity to remove steam
and vapors given off from the heating foods. It is then
exhausted through the exhausting air vents at the oven
cavity.
MONITOR FUSE
1. The monitor fuse blows when the contacts (COM-NO) of
the primary interlock relay and secondary interlock switch
remain closed with the oven door open and when the
monitor switch closes.
2. If the wire harness or electrical components are shortcircuited, this monitor fuse blows to prevent an electric
shock or fire hazard.
OVEN THERMAL CUT-OUT
The thermal cut-out, located on the top of the oven cavity, is
designed to prevent damage to the oven by fire. If the foods
load is overcooked, by either error in cook time or defect in
the control unit, the thermal cut-out will open.
Under normal operation, the oven thermal cut-out remains
closed. However, when abnormally high temperatures are
reached within the oven cavity, the oven thermal cut-out will
open at 257˚F(125˚C), causing the oven to shut down.
MAGNETRON THERMAL CUT-OUT
The thermal cut-out located near the magnetron is designed
to prevent damage to the magnetron if an over heated
condition develops in the tube due to cooling fan failure,
obstructed air guide, dirty or blocked air intake, etc.
Under normal operation, the thermal cut-out remains closed.
However, when abnormally high temperatures are reached
within the magnetron, the thermal cut-out will open at
203˚F(95˚C) causing the oven to shut down, when the
magnetron has cooled to 167˚F (75˚C), the thermal cut-out
closes and cook cycle will resume.
TROUBLESHOOTING GUIDE
When troubleshooting the microwave oven, it is helpful to follow the Sequence of Operation in performing the checks. Many
of the possible causes of trouble will require that a specific test be performed. These tests are given a procedure letter which
will be found in the "Test Procedure "section.
IMPORTANT: If the oven becomes inoperative because of a blown monitor fuse, check the monitor switch, primary interlock
relay, door sensing switch and secondary interlock switch before replacing the monitor fuse. If monitor fuse
is replaced, the monitor switch must also be replaced. Use part FFS-BA012WRK0 as an assembly.
9
Page 36
R-310AK
R-330AK
R-330AW
CK = Check / RE = Replace
CONDITION
OFF
CONDITION
COOKING
CONDITION
SENSOR
COOKING
CONDITION
FOR
R-330AK/AW
TEST PROCEDURE
AND
POSSIBLE CAUSE
DEFECTIVE PARTS
PROBLEM
Home fuse or circuit breaker
blows when power cord is plugged
into wall receptacle
Monitor fuse blows when power
cord is plugged into wall receptacle.
All letters and indicators do not
appear in display when power
cord is first plugged into wall outlet.
Display does not operate properly when STOP/CLEAR key is
touched. (Buzzer should sound
and ":" or time of day should appear in display.)
Oven lamp does not light when
door is opened.
Oven lamp does not go out when
door is closed.
Oven lamp does not light in cooking cycle. (Lights when door is
opened.)
Oven lamp lights but fan motor
and turntable motor do not operate.
Oven does not go into cook cycle
when START pad is touched
Oven seems to be operating but
little or no heat is produced in
oven load. (Food incompletely
cooked or not cooked at all at end
of cook cycle.)
Oven goes into a cook cycle but
extremely uneven heating is produced in oven load (food).
Oven does not cook properly
when programmed for Cooking
Power 5 mode. (Operates properly on Cooking Power 10 (HIGH)
mode.)
Oven goes into COMPU DEFROST but food is not defrosted
well.
AH sensor does not end during
Sensor cooking condition. (Oven
does not shut off after a cup of
water is boiling by sensor cooking.
Oven stops at 16 sec. after starting.
RERE A B C D E F F G H RERECK J CKCKCK L K M NI O
SHORT IN POWER CORD
SHORT OR OPENED WIRING
MAGNETRON
POWER TRANSFORMER
H.V. RECTIFIER ASSEMBLY
HIGH VOLTAGE CAPACITOR
THERMAL CUT-OUT
PRIMARY INTERLOCK SYSTEM
SECONDARY INTERLOCK SWITCH
MONITOR SWITCH
MONITOR FUSE
OVEN LAMP OR SOCKET
COOLING FAN MOTOR
TURNTABLE MOTOR
TOUCH CONTROL PANEL
WRONG OPERATION
LOW VOLTAGE
DIRTY OVEN CAVITY
RELAY (RY1)
KEY UNIT
COMPU DEFROST
FOIL PATTERN ON PWB.
OUTER CASE SWITCH
AH SENSOR
10
Page 37
TEST PROCEDURES
R-310AK
R-330AK
R-330AW
PROCEDURE
LETTER
AMAGNETRON ASSEMBLY TEST
HIGH VOLTAGES ARE PRESENT DURING THE COOK CYCLE, SO EXTREME CAUTION SHOULD
BE OBSERVED.
DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPONENTS
OR WIRING.
To test for an open filament, isolate the magnetron from the high voltage circuit. A continuity check across
the magnetron filament leads should indicate less than 1 ohm.
To test for a shorted magnetron, connect the ohmmeter leads between the magnetron filament leads and
chassis ground. This test should indicate an infinite resistance. If there is little or no resistance the
magnetron is grounded and must be replaced.
Power output of the magnetron can be measured by performing a water temperature rise test. This test
should only be used if above tests do not indicate a faulty magnetron and there is no defect in the following
components or wiring: silicon rectifier, high voltage capacitor and power transformer. This test will require
a 16 ounce (453cc) measuring cup and an accurate mercury thermometer or thermocouple type
temperature tester. For accurate results, the following procedure must be followed carefully:
1. Fill the measuring cup with 16 oz. (453cc) of tap water and measure the temperature of the water with
a thermometer or thermocouple temperature tester. Stir the thermometer or thermocouple through
the water until the temperature stabilizes. Record the temperature of the water.
2. Place the cup of water in the oven. Operate oven at POWER 10(HIGH) selecting more than 60
seconds cook time. Allow the water to heat for 60 seconds, measuring with a stop watch, second hand
of a watch or the digital read-out countdown.¡
3. Remove the cup from the oven and again measure the temperature, making sure to stir the
thermometer or thermocouple through the water until the maximum temperature is recorded.
4. Subtract the cold water temperature from the hot water temperature. The normal result should be 34.7
to 64.6˚F(19.3 to 35.9˚C) rise in temperature. If the water temperatures are accurately measured and
tested for the required time period the test results will indicate if the magnetron tube has low power
output (low rise in water temperature) which would extend cooking time or high power output (high
rise in water temperature) which would reduce cooking time. Because cooking time can be adjusted
to compensate for power output, the magnetron tube assembly should be replaced only if the water
temperature rise test indicates a power output well beyond the normal limits. The test is only accurate
if the power supply line voltage is 120 volts and the oven cavity is clean.
COMPONENT TEST
BPOWER TRANSFORMER TEST
DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPONENTS
OR WIRING.
Disconnect the primary input terminals and measure the resistance of the transformer with an ohmmeter.
Check for continuity of the coils with an ohmmeter. On the R x 1 scale, the resistance of the primary coil
should be less than 1 ohm and the resistance of the high voltage coil should be approximately 77.5 ohms
(for R-330AK/AW)/ 86.5 ohms (for R-310AK); the resistance of the filament coil should be less than 1 ohm.
(HIGH VOLTAGES ARE PRESENT AT THE HIGH VOLTAGE TERMINAL, SO DO NOT ATTEMPT TO
MEASURE THE FILAMENT AND HIGH VOLTAGE.)
CHIGH VOLTAGE RECTIFIER TEST
DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPONENTS
OR WIRING.
Isolate the rectifier from the circuit. Using the highest ohm scale of the meter, read the resistance across
the terminals and observe, reverse the leads to the rectifier terminals and observe meter reading. If a
short is indicated in both directions, or if an infinite resistance is read in both directions, the rectifier is
probably defective and should be replaced.
NOTE: Be sure to use an ohmmeter that will supply a forward bias voltage of more than 6.3 volts.
11
Page 38
R-310AK
R-330AK
R-330AW
TEST PROCEDURES
PROCEDURE
LETTER
DHIGH VOLTAGE CAPACITOR TEST
DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPONENTS
OR WIRING.
If the capacitor is open, no high voltage will be available to the magnetron. Disconnect input leads and
check for short or open between the terminals using an ohmmeter.
Checking with a high ohm scale, if the high voltage capacitor is normal, the meter will indicate continuity
for a short time and should indicate an open circuit once the capacitor is charged. If the above is not the
case, check the capacitor with an ohmmeter to see if it is shorted between either of the terminals and case.
If it is shorted, replace the capacitor.
EOVEN THERMAL CUT-OUT
A continuity check across the thermal cut-out terminals should indicate a closed circuit unless the
temperature of the thermal cut-out reaches approximately 257˚F(125˚C).
An open thermal cut-out indicates overheating of the oven, exchange the oven thermal cut-out and check
inside of oven cavity and for improper setting of cooking time or operation of control unit. Check for
restricted air flow through the vent holes of the oven cavity, especially the cooling fan and air guide.
MAGNETRON THERMAL CUT-OUT
A continuity check across the thermal cut-out terminals should indicate a closed circuit. If the temperature
of the magnetron reaches approximately 203˚F(95˚C), the thermal cut-out opens. The thermal cut-out
resets automatically below approximately 167˚F (75˚C). An open thermal cut-out indicates overheating
of the magnetron. Check for restricted air flow to the magnetron, especially the cooling fan air guide.
CAUTION: IF THE THERMAL CUT-OUT INDICATES AN OPEN CIRCUIT AT ROOM TEMPERATURE,
REPLACE THERMAL CUT-OUT.
COMPONENT TEST
FSECONDARY INTERLOCK SWITCH AND DOOR SWITCH TEST
Isolate the switch and connect the ohmmeter to the common (COM.) and normally open (NO) terminal
of the switch. The meter should indicated an open circuit with the door open and a closed circuit with the
door closed. If improper operation is indicated, replace the secondary interlock switch.
PRIMARY INTERLOCK SYSTEM TEST
DOOR SENSING SWITCH
Isolate the switch and connect the ohmmeter to the common (COM.) and normally open (NO) terminal
of the switch. The meter should indicated an open circuit with the door open and a closed circuit with the
door closed. If improper operation is indicated, replace the door sensing switch.
NOTE: If the door sensing switch contacts fail in the open position and the door is closed, the cooling
fan, turntable and oven light will be activated by RY1.
PRIMARY INTERLOCK RELAY
Disconnect two (2) wire leads from the male tab terminals of the Primary Interlock Relay. Check the state
of the relay contacts using a ohmmeter. The relay contacts should be open. If the relay contacts are
closed, replace the circuit board entirely or the relay itself.
GMONITOR SWITCH
Disconnect the oven from power supply. Before performing this test, make sure that the secondary
interlock switch and the primary interlock relay are operating properly, according to the above Switch
Test Procedure. Disconnect the wire lead from the monitor switch (NC) terminal. Check the monitor
switch operation by using the ohmmeter as follows. When the door is open, the meter should indicate
a closed circuit. When the monitor switch actuator is pushed by a screw driver through the lower latch
hole on the front plate of the oven cavity with the door
opened (in this condition the plunger of the monitor
switch is pushed in), the meter should indicate an
open circuit. If improper operation is indicated, the
switch may be defective. After testing the monitor
switch, reconnect the wire lead to the monitor switch
SCREW DRIVER
(NC) terminal and check the continuity of the monitor
circuit.
12
RED
GRY
MONITOR SWITCH
OHMMETER
Page 39
TEST PROCEDURES
R-310AK
R-330AK
R-330AW
PROCEDURE
LETTER
HBLOWN MONITOR FUSE
If the monitor fuse is blown when the door is opened, check the primary interlock relay, secondary
interlock switch and monitor switch according to the "TEST PROCEDURE" for those switches before
replacing the blown monitor fuse.
CAUTION: BEFORE REPLACING A BLOWN MONITOR FUSE, TEST THE PRIMARY INTERLOCK
RELAY, SECONDARY INTERLOCK SWITCH, DOOR SENSING SWITCH AND MONITOR
SWITCH FOR PROPER OPERATION.
If the monitor fuse is blown by improper switch operation, the monitor fuse and monitor switch must be
replaced with "monitor fuse and monitor switch assembly" part number FFS-BA012WRK0, even if the
monitor switch operates normally. The monitor fuse and monitor switch assembly is comprised of a 20
ampere fuse and switch.
IOUTER CASE SWITCH TEST
Isolate the switch and connect the ohmmeter to the common (COM.) and normally open (NO) terminal
of the switch. The meter should indicated an open circuit when its plunger is released and closed circuit
when its plunger is pushed. If improper operation is indicated, replace the outer case switch.
JTOUCH CONTROL PANEL ASSEMBLY TEST
The touch control panel consists of circuits including semiconductors such as LSI, ICs, etc. Therefore,
unlike conventional microwave ovens, proper maintenance cannot be performed with only a voltmeter
and ohmmeter.
In this service manual, the touch control panel assembly is divided into Liquid crystal display, rubber
connector, Control Unit and Key Unit, and troubleshooting by replacement is described according to the
symptoms indicated.
1. Key Unit. Note: Check key unit ribbon connection before replacement.
The following symptoms indicate a defective key unit. Replace the key unit.
a) When touching the pads, a certain pad produces no signal at all.
b) When touching a number pad, two figures or more are displayed.
c) When touching the pads, sometimes a pad produces no signal.
2. Control Panel
The following symptoms indicate a defective control unit. Before replacing the control unit, perform
the Key unit test (Procedure K) to determine if control unit is faulty.
2-1 In connection with pads.
a) When touching the pads, a certain group of pads do not produce a signal.
b) When touching the pads, no pads produce a signal.
2-2 In connection with indicators
a) At a certain digit, all or some segments do not light up.
b) At a certain digit, brightness is low.
c) Only one indicator does not light.
d) The corresponding segments of all digits do not light up; or they continue to light up.
e) Wrong figure appears.
f) A certain group of indicators do not light up.
g) The figure of all digits flicker.
2-3 Other possible problems caused by defective control unit.
a) Buzzer does not sound or continues to sound.
b) Clock does not operate properly.
c) Cooking is not possible.
Note: When defective components, the Control Unit or Key Unit are replaced, the defective part or parts
must be properly packed for return in the shipping carton, with its cushion material, in which the
new replacement part was shipped to you.
COMPONENT TEST
13
Page 40
R-310AK
R-330AK
R-330AW
TEST PROCEDURES
PROCEDURE
LETTER
KKEY UNIT TEST
If the display fails to clear when the STOP/CLEAR pad is depressed, first verify the flat ribbon is making
good contact, verify that the door sensing switch (stop switch) operates properly; that is the contacts are
closed when the door is closed and open when the door is open. If the door sensing switch (stop switch)
is good, disconnect the flat ribbon cable that connects the key unit to the control unit and make sure the
door sensing switch is closed (either close the door or short the door sensing switch connecter). Use the
Key unit matrix indicated on the control panel schematic and place a jumper wire between the pins that
correspond to the STOP/CLEAR pad making momentary contact. If the control unit responds by clearing
with a beep the key unit is faulty and must be replaced. If the control unit does not respond, it is a faulty
and must be replaced. If a specific pad does not respond, the above method may be used (after clearing
the control unit) to determine if the control unit or key pad is at fault.
G12 G11 G10 G 9
LRELAY TEST
COMPONENT TEST
G 8G 7G 6G 5G 4G 3G 2G 1
POPCORN
SOUP
RICE
REHEAT
FROZEN
DINNER
FRESH VEG
SOFT
COMPU
COOK
BAKED
POTATO
FRESH VEG
HARD
FISH
SEA FOOD
54321
09876
MINUTE
KITCHEN
TIMER
START
TOUCH
ON
PLUS
CLOCK
FROZEN
VEG
HOT
DOG
GROUND
MEAT
COMPU
DEFROST
R-330AK/AWR310AK
CUSTOM
HELP
POWER
LEVEL
STOP
CLEAR
G 8G 7G 6G 5G 4G 3G 2G 1
54321
BEVERAGE
BAKED
POTATO
POPCORN
DINNER
PLATE
STOP
CLEAR
09876
START
MINUTE
PLUS
POWER
LEVEL
G12 G11 G10 G 9
COMPU
DEFROST
TIMER
CLOOK
FRESH
CASSEROLE
VEGETABLE
FROZEN
ROLL
/ MUFFIN
/ MUFFIN
REHEAT
FRESH
ROLL
Remove the outer case and check voltage between Pin No. 3 of the 2 pin connector (A) and the common
terminal of the relay RY2 on the control unit with an A.C. voltmeter.
The meter should indicate 120 volts, if not check oven circuit.
RY1 and RY2 Relay Test
These relays are operated by D.C. voltage
Check voltage at the relay coil with a D.C. voltmeter during the microwave cooking operation.
DC. voltage indicated ............. Defective relay.
DC. voltage not indicated ........ Check diode which is connected to the relay coil. If diode is good, control
RELAY SYMBOL
RY1Approx. 24.0V D.C.Approx. 15.5V D.C.Oven lamp / Turntable motor / Cooling fan motor
RY2Approx. 23.0V D.C.Approx. 12.0V D.C.Power transformer
MCOMPU DEFROST TEST
(1) Place one cup of water in the center of the turntable tray in the oven cavity.
(2) Close the door, touch the “ COMPU DEFROST “ pad twice and touch the Number pad “5”. And then
touch the “START” pad. (for R-310AK)
Close the door, touch the “ COMPU DEFROST “ pad and touch the Number pad “2”, and touch
Number pad “5”. And then touch the “START” pad. (for R-330AK/AW)
(3) The oven is in Compu Defrost cooking condition.
(4) The oven will operate as follows
WEIGHT
1ST STAGE2ND STAGE3RD STAGE
LEVELTIMELEVELTIMELEVELTIME
0.5lbs70%40sec.50%38sec.30%43sec.
unit is defective.
OPERATIONAL VOLTAGE
R-330AK/AWR-310AK
CONNECTED COMPONENTS
(5) If improper operation is indicated, the control unit is probably defective and should be checked.
14
Page 41
TEST PROCEDURES
R-310AK
R-330AK
R-330AW
PROCEDURE
LETTER
NPROCEDURES TO BE TAKEN WHEN THE FOIL PATTERN ON THE PRINTED WIRING BOARD
(PWB) IS OPEN
COMPONENT TEST
To protect the electronic circuits, this model is provided with a fine foil pattern added to the primary on
the PWB, this foil pattern acts as a fuse. If the foil pattern is open, follow the troubleshooting guide given
below for repair.
Problem: POWER ON, indicator does not light up.
STEPSOCCURRENCECAUSE OR CORRECTION
1The rated AC voltage is not present betweenCheck supply voltage and oven power cord.
Pin No. 3 of the 2-pin connector (A) and the
common terminal of the relay RY2.
2The rated AC voltage is present at primaryLow voltage transformer or secondary circuit defective.
side of low voltage transformer.Check and repair.
3Only pattern at “a” is broken.*Insert jumper wire J1 and solder.
4Pattern at “a” and “b” are broken.*Insert the coil RCILF2003YAZZ between “c” and “d”.
NOTE: *At the time of making these repairs, make a visual inspection of the varistor. Check for burned
damage and examine the transformer with a tester for the presence of layer short-circuit (check
the primary coil resistance which is approximately 210Ω± 15%(for R-330AK/AW), 540Ω±
20%(for R-310AK)). If any abnormal condition is detected, replace the defective parts.
31
RY1
CN - A
VRS1
d
b
(J1)
c
RY2
1
a
1
a
P
T1
d
(J1)
VRS1
2
b
CN - A
c
RY2
RY1
R-330AK/AWR-310AK
OAH SENSOR TEST (For R-330AK / AW)
Checking the initial sensor cooking condition
(1) The oven should be plugged in at least five minutes before sensor cooking.
(2) Room temperature should not exceed 95˚F (35˚C).
(3) The unit should not be installed in any area where heat and steam are generated. The unit should
not be installed, for example, next to a conventional surface unit. Refer to the “INSTALLATION
INSTRUCTIONS” of the operation manual.
(4) Exhaust vents are provided on the back of the unit for proper cooling and air flow in the cavity. To
permit adequate ventilation, be sure to install so as not to block these vents. There should be some
space for air circulation.
(5) Be sure the exterior of the cooking container and the interior of the oven are dry. Wipe off any moisture
with a dry cloth or paper towel.
(6) The Sensor works with food at normal storage temperature. For example, chicken pieces would be
at refrigerator temperature and canned soup at room temperature.
(7) Avoid using aerosol sprays or cleaning solvents near the oven while using Sensor settings. The
sensor will detect the vapour given of by the spray and turn off before food is properly cooked.
(8) If the sensor has not detected the vapour of the food, ERROR will appear and the oven will shut off.
Water load cooking test
Make sure the oven has been plugged in at least five minutes before checking sensor cook operation.
The cabinet should be installed and screws tightened.
15
Page 42
R-310AK
R-330AK
R-330AW
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
(1) Fill approximately 200 milliliters (7.2 oz) of tap water in a 1000 milliliter measuring cup.
(2) Place the container on the center of tray in the oven cavity.
(3) Close the door.
(4) Touch REHEAT pad of INSTANT SENSOR once. Now, the oven is in the sensor cooking condition
and “REHEAT” will appear in the display.
(5) The oven will operate for the first 16 seconds, without generating microwave energy.
NOTE: ERROR will appear if the door is opened or STOP/CLEAR pad is touched during first stage of
sensor cooking.
(6) After approximately 16 seconds, microwave energy is produced, and the display should start to count
down the remaining cooking time and, oven should turn off after water is boiling (bubbling).
If the oven does not turn off, replace the AH sensor or check the control unit, refer to explanation below.
TESTING METHOD FOR AH SENSOR AND/OR CONTROL UNIT
To determine if the sensor is defective, the simplest method is to replace it with a new replacement
sensor.
(1) Disconnect oven from power supply and remove outer case.
(2) Discharge the high voltage capacitor.
(3) Remove the AH sensor.
(4) Install the new AH sensor.
(5) Re-install the outer case.
(6) Reconnect the oven to the power supply and check the sensor cook operation proceed as follows:
6-1. Fill approximately 200 milliliters (7.2 oz) of tap water in a 1000 milliliter measuring cup.
6-2. Place the container on the center of tray in the oven cavity.
6-3. Close the door.
6-4. Touch REHEAT pad once.
6-5. The control panel is in automatic Sensor operation.
6-6. The display will start to count down the remaining cooking time, and the oven will turn off
automatically after the water is boiling (bubbling).
If new sensor dose not operate properly, the problem is with the control unit.
CHECKING CONTROL UNIT
(1) Disconnect oven from power supply and remove outer case.
(2) Discharge the high voltage capacitor.
(3) Disconnect the wire leads from the cook relay.
(4) Disconnect the sensor connector that is mounted to control panel.
(5) Then connect the dummy resistor circuit (see fig.) to the sensor connector of control panel.
(6) Reconnect the oven to the power supply and check the sensor cook operation proceed as follows:
6-1. Touch REHEAT pad once.
6-2. The control panel is in the sensor cooking operation.
6-3. After approximately 20 seconds, push plunger of select switch for more than 3 seconds. This
conditionis same as judgement by AH sensor.
6-4. After approximately 3 seconds, the display shows “ X X . X X “ which is the remaining cooking
time, and the display count down.
If the above is not the case, the control unit is probably defective.
If the above is proper, the AH sensor is probably defective.
Plunger
NC
NO
COM
NO
NC
F-1
F-2
F-3
To connector (F)
on Control Unit.
CONNECTOR
R1,R2 : 22Ω± 1% 1/2W
R3 : 10kΩ± 5% 1/4W
R4 : 1MΩ± 5% 1/4W
1
2
3
R1
R2
R3R4
COM
Sensor Dummy Resistor Circuit
16
Page 43
TOUCH CONTROL PANEL ASSEMBLY
OUTLINE OF TOUCH CONTROL PANEL
R-310AK
R-330AK
R-330AW
The touch control section consists of the following units as
shown in the touch control panel circuit.
(1) Key Unit
(2) Control Unit
The principal functions of these units and the signals communicated among them are explained below.
Key Unit (R-330AK / AW)
The key unit is composed of a matrix, signals generated in
the LSI are sent to the key unit through P36, P35, P34, P33,
P27, P26, P25 and P24.
When a key pad is touched, a signal is completed through
the key unit and passed back to the LSI through P20 - P23
to perform the function that was requested.
Key Unit (R-310AK )
The key unit is composed of a matrix, signals generated in
the LSI are sent to the key unit through P73, P81, P82, P83,
P90 and P91.
When a key pad is touched, a signal is completed through
the key unit and passed back to the LSI through P60 - P63
to perform the function that was requested.
Control Unit
Control unit consists of LSI, ACL circuit, indicator circuit,
power source circuit, relay circuit, buzzer circuit, synchronizing signal circuit, absolute humidity sensor circuit and
back light circuit.
1) ACL
This circuit generates a signal which resets the LSI to the
initial state when power is supplied.
2) Indicator Circuit (R-330AK / AW)
This circuit consists of 25 segments and 4 common
electrodes using a Liquid Crystal Display.
Indicator Circuit (R-310AK)
This circuit consists of 12 segments and 3 common
electrodes using a Liquid Crystal Display.
3) Power Source Circuit
This circuit generates voltages necessary in the control
unit from the AC line voltage.
In addition, the synchronizing signal is available in order
to compose a basic standard time in the clock circuit.
SymbolVoltageApplication
VC-5VLSI(IC1)
4) Relay Circuit
A circuit to drive the magnetron, fan motor, turntable
motor and light the oven lamp.
5) Buzzer Circuit
The buzzer is responsive to signals from the LSI to emit
audible sounds (key touch sound and completion sound).
6) Synchronizing Signal Circuit
The power source synchronizing signal is available in
order to compose a basic standard time in the clock
circuit.
It accompanies a very small error because it works on
commercial frequency.
7) Door Sensing Switch
A switch to “tell” the LSI if the door is open or closed.
8) Back Light Circuit
A circuit to drive the back light (Light emitting diodes
LD1- LD5).
This circuit detects moisture of the cooking food to allow
its automatic cooking.
17
Page 44
R-310AK
R-330AK
R-330AW
DESCRIPTION OF LSI
LSI(IZA737DR) : R-330AK / AW
The I/O signal of the LSI(IZA737DR) is detailed in the following table.
Pin No.SignalI/ODescription
1-4AN8-AN11INConnected to GND.
5AVSSINConnected to VC.
6TESTINConnected to VC.
7X2OUTTerminal not used.
8X1INConnected to GND.
9VSSIN
10OCS1IN
11OCS2OUT
12RESETIN
13MD0INConnected to GND.
14P20IN
15P21IN
16P22IN
17P23IN
18P24OUT
19P25OUT
20P26OUT
21P27OUT
22P30OUT
Power source voltage : -5.1V.
VC voltage of power source circuit input.
Internal clock oscillation frequency input setting.
The internal clock frequency is set by inserting the ceramic filter oscillation circuit with respect
to OCS1 terminal.
Internal clock oscillation frequency control output.
Output to control oscillation input of OCS2.
Auto clear terminal.
Signal is input to reset the LSI to the initial state when power is applied. Temporarily set to
“L” level the moment power is applied, at this time the LSI is reset. Thereafter set at “H” level.
Signal coming from touch key.
When either G12 line on key matrix is touched, a corresponding signal out of P24 - P27, P33,
P34, P35 and P36 will be input into P20. When no key is touched, the signal is held at “H” level.
Signal similar to P20.
When either G11 line on key matrix is touched, a corresponding signal will be input into P21.
Signal similar to P20.
When either G10 line on key matrix is touched, a corresponding signal will be input into P22.
Signal similar to P20.
When either G9 line on key matrix is touched, a corresponding signal will be input into P23.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P20 - P23 terminal while one
of G8 line keys on key matrix is touched.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P20 - P23 terminal while one
of G7 line keys on key matrix is touched.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P20 - P23 terminal while one
of G6 line keys on key matrix is touched.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P20 - P23 terminal while one
of G5 line keys on key matrix is touched.
Signal to sound buzzer (2.0KHz).
A: key touch sound.
B: Completion sound.
0.1 sec.
A
2 sec.
B
H : GND
L: -5V
H : GND
L: -5V
23-24P31-P32OUTTerminal not used.
25P33OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P20 - P23 terminal while one
of G4 line keys on key matrix is touched.
26P34OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P20 - P23 terminal while one
of G3 line keys on key matrix is touched.
27P35OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P20 - P23 terminal while one
of G2 line keys on key matrix is touched.
18
Page 45
Pin No.SignalI/ODescription
28P36OUTKey strobe signal.
Signal applied to touch-key section. A pulse signal is input to P20 - P23 terminal while one
of G1 line keys on key matrix is touched.
29P37OUTTerminal not used.
30VSSIN
Power source voltage : -5V.
VSS voltage of power source circuit input.
31-33V3-V1IN
Power source voltage input terminal.
Standard voltage for LCD.
34VCCINConnected to GND.
35COM4OUT
Common data signal: COM4.
Connected to LCD (Pin No. 1).
36COM3OUT
Common data signal: COM3.
Connected to LCD (Pin No. 2).
37COM2OUT
Common data signal: COM2.
Connected to LCD (Pin No. 3).
38COM1OUT
Common data signal: COM1.
Connected to LCD (Pin No. 4).
39-50
51SEG13OUT
SEG1-SEG12
OUTTerminal not used.
Segment data signal.
Connected to LCD.
The relation between signals are as follows:
LSI signal (Pin No.)LCD (Pin No.)LSI signal (Pin No.)LCD (Pin No.)
SEG 13 (51)............................. 29P83 (66)................................... 16
SEG 14 (52)............................. 28P84 (67)................................... 15
SEG 15 (53)............................. 27P85 (68)................................... 14
SEG 16 (54)............................. 26P86 (69)................................... 13
SEG 18 (56)............................. 25P87 (70)................................... 12
SEG 19 (57)............................. 24P91 (72)................................... 11
SEG 20 (58)............................. 23P92 (73)................................... 10
SEG 21 (59)............................. 22P93 (74)..................................... 9
SEG 22 (60)............................. 21P94 (75)..................................... 8
SEG 23 (61)............................. 20P95 (76)..................................... 7
SEG 24 (62)............................. 19P96 (77)..................................... 6
Signal similar to SEG 13.
55SEG17OUTTerminal not used.
56-62
SEG 18-SEG24
OUTSegment data signal.
Signal similar to SEG 13.
63SEG25OUTTerminal not used.
64-70P81-P87OUT
Segment data signal.
Signal similar to SEG 13.
71P90OUTTerminal not used.
72-78P91-P97OUT
Segment data signal.
Signal similar to SEG 13.
79VCCINConnected to GND.
80-82P10-P12INTerminal not used.
83-87P13-P17OUTUsed for initial balancing of the bridge circuit (absolute humidity sensor).
88P40OUT
Oven lamp, fan motor and turntable motor driving signal.
To turn on and off shut off relay (RY1). The square waveform voltage is delivered to the RY1
driving circuit and RY2 control circuit.
16.7 msec
H : GND
R-310AK
R-330AK
R-330AW
19
During cooking
L : -5V
Page 46
R-310AK
R-330AK
R-330AW
Pin No.SignalI/ODescription
89P41INTerminal not used.
90P42OUT
91INTIN
Magnetron high-voltage circuit driving signal.
To turn on and off the cook relay (RY2). The
signals holds “L” level during microwave cooking and “H” level while not cooking. In other
cooking modes (variable cooking) the signal
turns to “H” level and “L” level in repetition
according to the power level.
Signal synchronized with commercial power source frequency.
OFF
P-HI
OFFOFF
P-70
ON
ON
24 sec.
8 sec.
This is basic timing for time processing of LSI.
16.7 msec
92AVCCINConnected to GND.
93AN0INUsed for initial balancing of the bridge circuit (absolute humidity sensor). This input is an
analog input terminal from the AH sensor circuit, and connected to the A/D converter built into
the LSI.
94AN1IN
AH sensor input.
This input is an analog input terminal from the AH sensor circuit, and connected to the A/D
converter built into the LSI.
95AN2INConnected to GND.
96AN3IN
To input signal which communicates the door open/close information to LSI.
Door closed; “H” level signal (0V).
Door opened; “L” level signal (-5V).
97-100AN4-AN7IN
Terminal to change cooking constant according to the Model.
By using the A/D converter contained in the LSI, DC voltage in accordance with the Model
in operation is applied to set up its cooking constant.
H : GND
L : -5V
H : GND
L : -5V
H : GND
L : -5V
LSI(IZA738DR) : R-310AK
The I/O signal of the LSI(IZA738DR) is detailed in the following table.
Pin No.SignalI/ODescription
1SEG 0OUT
Segment data signal.
Connected to LCD.
12SEG11The relation between signals are as follows:
LSI signal (Pin No.)LCD (Pin No.)LSI signal (Pin No.)LCD (Pin No.)
SEG 0 (1) ....................................... 4SEG 6 (7) .................................... 10
SEG 1 (2) ....................................... 5SEG 7 (8) .................................... 11
SEG 2 (3) ....................................... 6SEG 8 (9) .................................... 12
SEG 3 (4) ....................................... 7SEG 9 (10) .................................. 13
SEG 4 (5) ....................................... 8SEG 10 (11) ................................14
SEG 5 (6) ....................................... 9SEG 11(12) ................................. 15
13R60IN
Signal coming from touch key.
When either G12 line on key matrix is touched, a corresponding signal out of R73, R81-R83
and R90-R91 will be input into R60. When no key is touched, the signal is held at "H" level.
14R61IN
Signal similar to R60.
When either G11 line on key matrix is touched, a corresponding signal will be input into R61.
15R62IN
Signal similar to R60.
When either G10 line on key matrix is touched, a corresponding signal will be input into R61.
16R63IN
Signal similar to R60.
When either G9 line on key matrix is touched, a corresponding signal will be input into R61.
17AIN0IN
To input signal which communicates the door open/close information to LSI.
Door close "H" level signal (0V). Door open "L" level (-5V)
18-20
AIN1-AIN3
INTerminal to change functions according to the Model.
By using the A/D converter contained in the LSI, DC voltage in accordance with the Model
in operation is applied to set up its function.
20
Page 47
Pin No.SignalI/ODescription
16.7 msec
During cooking
H : GND
L : -5V
21VSSINPower source voltage: -5V
VSS voltage of power source circuit input.
22R70OUT
Magnetron high-voltage circuit driving signal.
To turn on and off the cook relay (RY2). The
signals holds "L" level during microwave cooking and "H" level while not cooking. In other
cooking modes (variable cooking) the signal
turns to "H" level and "L" level in repetition
according to the power level.
(ON and OFF times for other power level.)
23PULSEOUT
Signal to sound buzzer (2.0 kHz).
A: key touch sound.
B: Completion sound.
24R72OUTOven lamp, fan motor and turntable motor driving signal
To turn on and off shut off relay (RY1). The
square waveform voltage is delivered to the
RY1 driving circuit and RY2 control circuit.
25R73OUTKey strobe signal.
Signal applied to touch-key section. A pulse signal is input to R60 - R63 terminal while one
of G8 line keys on key matrix is touched.
26INT2IN
Signal synchronized with commercial power source frequency.
This is the basic timing for time processing of LSI.
OFF
P-HI
OFFOFF
P-70
0.1 sec.
A
B
ON
24 sec.
ON
2 sec.
16.7 msec
8 sec.
R-310AK
R-330AK
R-330AW
H : GND
L : -5V
H : GND
L : -5V
H : GND
L: -5V
H : GND
L: -5V
H : GND
L : -5V
27R81OUTKey strobe signal.
Signal applied to touch-key section. A pulse signal is input to R60 - R63 terminal while one
of G7 line keys on key matrix is touched.
28R82OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to R60 - R63 terminal while one
of G6 line keys on key matrix is touched.
29R83OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to R60 - R63 terminal while one
of G5 line keys on key matrix is touched.
30R90OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to R60 - R63 terminal while one
of G4 line keys on key matrix is touched.
31R91OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to R60 - R63 terminal while one
of G3 line keys on key matrix is touched.
32R92OUTTerminal not used.
33XININ
Internal clock oscillation frequency setting input.
The internal clock frequency is set by inserting the capacitor and resistor circuit with respect
to XOUT terminal.
34XOUTOUT
Internal clock oscillation frequency control output.
Output to control oscillation input of XIN.
35RESETIN
Auto clear terminal.
Signal is input to reset the LSI to the initial state when power is supplied. Temporarily set "L"
level the moment power is supplied, at this time the LSI is reset. Thereafter set at "H" level.
36HOLDIN/OUT Connected to GND.
37VLCIN
Signal synchronized with commercial power source frequency.
Signal similar to VSS.
38COM1OUT
Common data signal: COM1.
Connected to LCD (Pin No. 1)
39COM2OUT
Common data signal: COM2.
Connected to LCD (Pin No. 2)
21
Page 48
R-310AK
R-330AK
R-330AW
Pin No.SignalI/ODescription
40COM3OUTCommon data signal: COM1.
Connected to LCD (Pin No. 3)
41COM4OUTTerminal not used.
42VDDIN
Power source voltage input terminal.
Connected to GND.
ABSOLUTE HUMIDITY SENSOR CIRCUIT (R-330AK / AW)
(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.
Sensing part
(Open vessel)
Sensing part
(Closed vessel)
(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 two
thermistors and two resistors (R1 and R2).
The output of the bridge circuit is to be amplified by the
operational amplifier.
Each thermistor is supplied with a current to keep it
heated at about 150˚C (302˚F), the resultant heat is
dissipated in the air and if the two thermistors are placed
in different humidity conditions they show different
degrees of heat conductivity leading to a potential
difference between them causing an output voltage from
the bridge circuit, the intensity of which is increased as
the absolute humidity of the air increases. Since the
output is very minute, it is amplified by the operational
amplifier.
Absolute humidity vs,
R1
R2
Operational
amplifier
+
S : Thermistor
open vessel
C : Thermistor
closed vessel
Output
voltage
Output voltage
C
S
R3
output voltage characterist
Absolute humidity (g/m )
2
(3)Detector Circuit of Absolute Humidity Sensor Circuit
This detector circuit is used to detect the output voltage
of the absolute humidity circuit to allow the LSI to control
sensor cooking of the unit. When the unit is set in the
sensor cooking mode, 16 seconds clearing cycle occurs
than the detector circuit starts to function and the LSI
observes the initial voltage available at its AN1 terminal.
With this voltage given, the switches SW1 to SW5 in the
LSI are turned on in such a way as to change the
resistance values in parallel with R3 ~ R7 of IC2. Changing
the resistance values results in that there is the same
potential at both F-3 terminal of the absolute humidity
sensor and AN0 terminal of the LSI. The voltage of AN1
terminal will indicate about -2.5V. This initial balancing
is set up about 16 seconds after the unit is put in the
Sensor Cooking mode. As the sensor cooking proceeds,
the food is heated to generate moisture by which the
resistance balance of the bridge circuit is deviated to
increase the voltage available at AN1 terminal of the LSI.
Then the LSI observes that voltage at AN1 terminal and
compares it with its initial value, and when the comparison
rate reaches the preset value (fixed for each menu to be
cooked), the LSI causes the unit to stop sensor cooking;
thereafter, the unit goes in the next operation
automatically.
When the LSI starts to detect the initial voltage at AN1
terminal 16 seconds after the unit has been put in the
Sensor Cooking mode, if it is not possible to balance, of
the bridge circuit due to disconnection of the absolute
humidity sensor, ERROR will appear on the display and
the cooking is stopped.
1) Absolute humidity sensor circuit
C. Thermistor in
closed vesssl
S. Thermistor in
open vessel
F-1
C
F-3
3.57k
S
F-2
VA : -15V
11
3.32k
10
R50
IC2(IZA495DR)
R3
R4
R5
R6
R7
R8
47k
+
0.1
uF
-
1.8k
0
VA : -15V
620k
300k
150k
75k
37.4k
360k
12
0.01uF
0.015uF
10k
VC : -5V
4
5
6
7
8
3
0.01uF
2
47k
1
SW1
9
P97
SW2
8
P96
SW3
7
P95
SW4
6
P94
SW5
5
P93
11
AN0
LSI
(IC1)
12
AN1
22
Page 49
SERVICING
R-310AK
R-330AK
R-330AW
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 impedance 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 sometimes it is not fully
protected by the built-in protection circuit.
In order to protect CMOS LSI.
1) When storing and transporting, thoroughly wrap them in
aluminium foil. Also wrap all PW boards containing them
in aluminium foil.
2) When soldering, ground the technician as shown in the
figure and use grounded soldering iron and work table.
approx. 1M ohm
2. Shapes of Electronic Components
Transistor
2SA933S
C
B
DTA123ES
DTA143ES
KRA101M
KRC243M
Transistor
2SB1238
B
C
E
E
3. Servicing of Touch Control Panel
We describe the procedures to permit servicing of the
touch control panel of the microwave oven and the
precautions you must take when doing so. To perform
the servicing, power to the touch control panel is available
either from the power line of the oven itself or from an
external power source.
(1)Servicing the touch control panel with power supply of
the oven:
CAUTION:
THE HIGH VOLTAGE TRANSFORMER OF THE
MICROWAVE OVEN IS STILL LIVE DURING
SERVICING PRESENTS A HAZARD.
Therefore, when checking the performance of the touch
control panel, put the outer cabinet on the oven to avoid
touching the high voltage transformer, or unplug the
primary terminal (connector) of the high voltage
transformer to turn it off; the end of such connector must
be insulated with an insulating tape. After servicing, be
sure to replace the leads to their original locations.
A. On some models, the power supply cord between the
touch control panel and the oven itself is so short that the
two can’t be separated. For those models, check and
repair all the controls (sensor-related ones included) of
the touch control panel while keeping it connected to the
oven.
B. On some models, the power supply cord between the
touch control panel and the oven proper is long enough
that they may be separated from each other. For those
models, therefore, it is possible to check and repair the
controls of the touch control panel while keeping it apart
from the oven proper; in this case you must short both
ends of the door sensing switch (on PWB) of the touch
control panel with a jumper, which brings about an
operational state that is equivalent to the oven door
being closed. As for the sensor-related controls of the
touch control panel, checking them is possible if dummy
resistor(s) with resistance equal to that of the controls
are used.
(2)Servicing the touch control panel with power supply from
an external power source:
Disconnect the touch control panel completely from the
oven proper, and short both ends of the door sensing
switch (on PWB) of the touch control panel, which brings
about an operational state that is equivalent to the oven
door being closed. Connect an external power source to
the power input terminal of the touch control panel, then
it is possible to check and repair the controls of the touch
control panel it is also possible to check the sensorrelated controls of the touch control panel by using the
dummy resistor(s).
4. Servicing Tools
Tools required to service the touch control panel
assembly.
1) Soldering iron: 30W
(It is recommended to use a soldering iron with a
grounding terminal.)
2) Oscilloscope: Single beam, frequency range: DC-10MHz
type or more advanced model.
3) Others: Hand tools
5. Other Precautions
1) Before turning on the power source of the control unit,
remove the aluminium foil applied for preventing static
electricity.
2) Connect the connectors of the key unit to the control unit
being sure that the lead wires are not twisted.
3) After aluminium foil is removed, be careful that abnormal
voltage due to static electricity etc. is not applied to the
input or output terminals.
4) Attach connectors, electrolytic capacitors, etc. to PWB,
making sure that all connections are tight.
5) Be sure to use specified components where high precision
is required.
23
Page 50
R-310AK
R-330AK
R-330AW
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE
CAUTION: DISCONNECT OVEN FROM POWER SUPPLY BEFORE REMOVING OUTER CASE.
DISCHARGE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPONENTS OR WIRING
AFTER REMOVING OUTER CASE.
OUTER CASE REMOVAL
To remove the components, procedure as follows.
1. Disconnect oven from power supply.
2. Remove four(4) screws from rear and one (1) screws
along the right side of case.
3. Slide the entire case back out about 1 inch(3 cm) to free
POWER TRANSFORMER REMOVAL
it from retaining clips on the cavity face plate.
4. Lift entire case from the unit.
CAUTION: DISCONNECT OVEN FROM POWER SUP-
PLY BEFORE REMOVING OUTER CASE.
1. Disconnect oven from power supply and remove outer
case.
2. Discharge high voltage capacitor.
3. Disconnect wire leads from power transformer,
magnetron and capacitor terminals.
4. Remove four (4) screws holding transformer to bottom
plate right.
5. Remove transformer from bottom plate right.
6. Remove the one (1) terminal insulator and tube from
filament lead (longer one) of power transformer.
Re-install
1. Install the terminal insulator to receptacle of filament
TERMINAL INSULATOR REPLACEMENT
1. Open covers of the terminal insulator by using small flat
type screw driver.
2. Remove the receptacle from the terminal insulator.
3. Now, the terminal insulator is free.
Terminal
insulator
Flat type
screw driver
lead (longer one) of power transformer.
2. Rest transformer on the bottom plate right with its primary
terminals toward the oven face plate.
3. Secure transformer with four screws to bottom plate
right.
4. Re-connect wire leads (primary and high voltage) to
power transformer and filament leads of transformer to
magnetron and high voltage capacitor. Refer to
"PICTORIAL DIAGRAM" on page 29 or 30.
5. Re-install outer case and check that oven is operating
properly.
Installation
1. Insert the receptacle into terminal insulator.
2. Close covers of the terminal insulator, as shown below.
COVERS
RECEPTACLE
MAGNETRON REMOVAL
Removal
1. Disconnect oven from power supply and remove outer
case.
2. Discharge high voltage capacitor.
3. Disconnect wire leads from magnetron.
4. Remove the one (1) screw holding chassis support to
magnetron.
5. Remove the chassis support from oven.
6. Remove the one (1) screw holding the magnetron air
guide to the magnetron.
7. Carefully remove the two (2) screws holding magnetron
to waveguide flange.
8. Lift up magnetron with care so that magnetron antenna
is not hit by any metal object around antenna.
9. Now, the magnetron is free.
Re-install
1. Re-install the magnetron to waveguide flange with the
two (2) screws diagonally as shown in Figure C-1.
2. Re-install the magnetron air guide to magnetron with the
one (1) screw.
3. Insert the two (2) tabs of the chassis support to the oven
cavity front plate and the back plate.
4. Re-install the chassis support to magnetron with the one
(1) screw.
5. Reconnect the wire leads to the magnetron. Refer to
"PICTORIAL DIAGRAM" on page 29 or 30.
6. Re-install outer case and check that the oven is operating
properly.
CAUTION: WHEN REPLACING MAGNETRON, BE SURE
THE R.F. GASKET IS IN PLACE AND MOUNTING SCREWS ARE TIGHTENED SECURELY
SCREWS
MAGNETRON
WAVEGUIDE
FLANGE
Figure C-1. Magnetron replacement
24
Page 51
HIGH VOLTAGE RECTIFIER AND HIGH VOLTAGE CAPACITOR REMOVAL
R-310AK
R-330AK
R-330AW
1. Disconnect oven from power supply and remove outer
case.
2. Discharge high voltage capacitor.
3. Disconnect the high voltage wire B from the high voltage
capacitor.
4. Disconnec t he high voltage wire of high voltage rectifier
assembly from the magnetron.
5. Remove one (1) screw holding capacitor holder to oven
cavity rear plate.
6. Disconnect rectifier terminal from capacitor.
OVEN LAMP AND LAMP SOCKET REMOVAL
1. Disconnect oven from power supply and remove outer
case.
2. Discharge high voltage capacitor.
3. Bend the tab of the partition angle holding the lamp
socket.
4. Lift up the oven lamp socket.
5. Pull the wire leads from the oven lamp socket by pushing
the terminal hole of the oven lamp socket with the small
flat type screw driver.
6. Now, the oven lamp socket is free.
POSITIVE LOCK® CONNECTOR (NO-CASE TYPE) REMOVAL
Push the lever of positive lock® connector. Pull down on the
positive lock® connector.
CAUTION: WHEN YOU CONNECTING THE POSITIVE
LOCK® CONNECTORS TO THE TERMINALS,
INSTALL THE POSITIVE LOCK® SO THAT
THE LEVER FACES YOU
High voltage rectifier assembly is now free.
7. Remove one (1) screw holding high voltage rectifier
assembly to capacitor holder.
8. Remove capacitor holder. Capacitor is now free.
CAUTION: WHEN REPLACING HIGH VOLTAGE RECTI-
FIER AND HIGH VOLTAGE CAPACITOR,
GROUND SIDE TERMINAL OF THE HIGH
VOLTAGE RECTIFIER MUST BE SECURED
FIRMLY WITH A GROUNDING SCREW.
Oven lamp
socket
Terminal
Wire lead
Terminal hole
Flate type small
screw driver
Figure C-2. Oven lamp socket
Terminal
Positive lock®
connector
Lever
1
Push
CONTROL PANEL ASSEMBLY REMOVAL
1. Disconnect oven from power supply and remove outer
case.
2. Discharge high voltage capacitor.
3. Disconnect wire leads from the door sensing switch and
the oven cavity front flange.
4. Disconnect the wire leads from panel components.
5. Make one (1) tab of the oven cavity front plate straight
holding the control panel assembly to the oven flange.
6. Slide the control panel assembly upward and remove it.
7. Now, individual components can be removed.
TURNTABLE MOTOR REMOVAL
1. Disconnect oven from power supply.
2. Remove turntable and turntable support from oven cavity.
3. Lay the oven on it's backside. Remove the turntable
motor cover by snipping off the material in four corner.
4. Where the corners have been snipped off bend corner
areas flat. No sharp edge must be evident after removal
of the turntable motor cover.
2
Pull down
Figure C-3. Positive lock® connector
NOTE: 1. Before attaching a new key unit, wipe off remaining
adhesive on the control panel frame surfaces
completely with a soft cloth soaked in alcohol.
2. When attaching the key unit to the control panel
frame, adjust the upper edge and right edge of
the key unit to the correct position of control panel
frame.
3. Stick the key unit firmly to the control panel frame
by rubbing with soft cloth not to scratch.
5. Disconnect wire leads from turntable motor.
(See "Positive lock connector removal")
6. Remove two (2) screws holding turntable motor to oven
cavity.
7. Now the turntable motor is free.
8. After replacement use the one (1) screw to fit the
turntable motor cover.
25
Page 52
R-310AK
R-330AK
R-330AW
COOLING FAN MOTOR REMOVAL
1. Disconnect oven from power supply and remove outer
case.
2. Discharge high voltage capacitor.
3. Disconnect the wire leads from the fan motor.
4. Remove one (1) screw holding the chassis support to
magnetron. And remove chassis support.
5. Release the snap of the main wire harness from the fan
duct.
6. Remove one (1) screw holding the fan duct assembly to
oven cavity.
7. Release the main wire harness from the hole of the fan
duct.
8. Release the fan duct from the waveguide flange.
9. Release the fan duct assembly from the oven cavity.
10.Remove the fan blade from the fan motor shaft according
the following procedure.
1) Hold the edge of the rotor of the fan motor by using a pair
of grove joint pliers.
CAUTION:
* Make sure that any pieces do not enter the gap
between the rotor and the stator of the fan motor
because the rotor is easily shaven by pliers and
metal pieces may be produced.
* Do not touch the pliers to the coil of the fan motor
because the coil may be cut or injured.
* Do not disfigure the bracket by touching with the
pliers.
2) Remove the fan blade from the shaft of the fan motor by
pulling and rotating the fan blade with your hand.
3) Now, the fan blade will be free.
CAUTION:
* Do not reuse the removed fan blade because the
hole (for shaft) may be larger than normal.
Coil
11.Remove the two (2) screws holding the fan motor to the
fan duct.
12.Now, the fan motor is free.
INSTALLATION
1. Install the fan motor to the fan duct with the two (2)
screws.
2. Install the fan blade to the fan motor shaft according the
following procedure.
1) Hold the center of the bracket which supports the shaft
of the fan motor on the flat table.
2) Apply the screw lock tight into the hole (for shaft) of the
fan blade.
3) Install the fan blade to the shaft of fan motor by pushing
the fan blade with a small, light weight, ball peen hammer
or rubber mallet.
CAUTION:
* Do not hit the fan blade strongly when installed
because the bracket may be disfigured.
* Make sure that the fan blade rotates smooth after
installation.
* Make sure that the axis of the shaft is not slanted.
3. Catch three holes of fan duct on three tabs of the
waveguide flange.
4. Install the fan duct assembly to the oven cavity with the
one (1) screw.
5. Insert the snap of the main wire harness to the hole of the
fan duct and insert the main wire harness into the hole of
the fan duct.
6. Install one (1) tab of the chassis support to oven cavity
front plate and install another tab of it to rear plate. And
then screw chassis support to magnetron with one (1)
screw.
7. Connect the wire leads to the fan motor, referring to the
pictorial diagram.
Stator
Gap
Bracket
Rotor
Groove joint pliers
Axis
Shaft
Stator
Rotor
These are the position
where should be
pinched with pliers
Table
Shaft
Center of
bracket
Side ViewRear View
DOOR SENSING SWITCH/SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH REMOVAL
1. Disconnect oven from power supply and remove outer
case.
2. Discharge high voltage capacitor.
3. Disconnect wire leads from the switches.
4. Remove two (2) screws holding latch hook to oven
flange.
5. Remove latch hook assembly from oven flange.
6. Push outward on the two (2) retaining tabs holding switch
in place.
7. Switch is now free.
At this time switch lever will be free, do not lose it.
Re-install
1. Re-install each switch in its place. The secondary
interlock/monitor switches are in the lower position and
the door sensing switch is in the upper position.
2. Re-connect wire leads to each switch.
Refer to pictorial diagram.
3. Secure latch hook (with two (2) mounting screws) to
oven flange.
4. Make sure that the monitor switch is operating properly
and check continuity of the monitor circuit. Refer to
chapter "Test Procedure" and Adjustment procedure.
26
Page 53
R-310AK
R-330AK
R-330AW
DOOR SENSING SWITCH/SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH ADJUSTMENT
If the door sensing switch, secondary interlock switch and
monitor switch do not operate properly due to a
misadjustment, the following adjustment should be made.
1. Loosen the two (2) screws holding latch hook to the oven
cavity front flange.
2. With 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 vertical position of the
latch hook should be adjusted so that the door sensing
switch and secondary interlock switch are activated with
the door closed. The horizontal position of the latch hook
should be adjusted so that the plunger of the monitor
switch is pressed with the door closed.
3. Secure the screws with washers firmly.
4. Check the operation of all switches. If each switch has
not activated with the door closed, loosen screw and
adjust the latch hook position.
After adjustment, check the following.
1. In and out play of 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 the door
toward the oven face. Both results (play in the door)
should be less than 0.5mm.
2. The door sensing switch and secondary interlock switch
interrupt the circuit before the door can be opened.
3. Monitor switch contacts close when door is opened.
4. Re-install outer case and check for microwave leakage
around door with an approved microwave survey meter.
(Refer to Microwave Measurement Procedure.)
Door
Latch Hook
Latch
Heads
Switch
Lever
Door
Sensing
Switch
Monitor
Switch
Secondary
Interlock
Switch
Figure C-4. Latch Switch Adjustments
OUTER CASE SWITCHES REPLACEMENT (for the ovens from October 1996 production)
Removal
1. Disconnect the oven from the power supply and remove
the outer case.
2. Discharge high voltage capacitor.
3. Remove the one (1) screw holding the switch holder to
the oven cavity rear plate.
4. Release the two (2) tabs of the switch holder from the two
(2) holes of the oven cavity plate.
5. Release the one (1) snap of the main wire harness from
the hole of the switch holder.
6. Disconnect the wire leads from the outer case switches.
7. Remove the switch holder (outer case switch assembly)
from the oven cavity rear plate.
8. Push on the one (1) retaining tab holding the outer case
switch.
9. Turn the outer case switch clockwise around the pole.
10.Now, the outer case switch is free.
NOTE: Do not lose the actuator because it will be free after
the outer case switches are removed.
Re-install
1. Re-install the actuator to the switch holder by inserting
the tab of the actuator into the square hole on the switch
holder, as shown in Figure C-5.
2. Re-install the outer case switches to the switch holder,
as shown in Figure C-5.
3. Re-connect the wire leads to the outer case switches,
referring to the Pictorial diagram.
4. Re-install the one (1) snap of the main wire harness to
the hole of the switch holder.
5. Catch the two (2) tabs of the switch holder to the two (2)
holes of the oven cavity rear plate.
6. Re-connect the switch holder (outer case switch
assembly) to the oven cavity rear plate with the one (1)
screw.
7. Re-install the outer case cabinet and check that the oven
is operating properly.
Outer case switch
Pole
Tab
Actuater
Switch holder
Outer case switch
Figure C-5. Outer case switches replacement
DOOR REPLACEMENT
REMOVAL
1. Disconnect oven from power supply.
2. Push the open button and open the door slightly.
3. Insert an putty knife (thickness of about 0.5mm) into the
gap between the door stopper and the choke cover to
free engaging parts as shown in Figure C-6
4. Try the principles of the lever and lift up the door stopper.
5. Now, the door stopper is free from the door assembly.
6. Insert an putty knife (thickness of about 0.5mm) into the
gap between the choke cover and door frame as shown
in Figure C-6 to free engaging parts.
7. Try the principles of the lever and lift up the choke cover
27
Page 54
R-310AK
R-330AK
R-330AW
by inserting a putty knife as shown Figure C-6.
8. Release choke cover from door panel.
9. Now choke cover is free.
Door stopper
1
Choke Cover
11
12
10
9
8
13
7
6
2
3
4
5
Door Frame
Putty Knife
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 airtight, moisture (condensation)-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-6. Door Disassembly
10.Release two (2) pins of door panel from two (2) holes of
upper and lower oven hinges by lifting up.
11.Now, door panel with door frame is free from oven cavity.
12.Release door panel from nine (9) tabs of door frame by
sliding door panel downward.
13.Now, door panel with sealer film is free.
14.Tear sealer film from door panel.
15.Now, door panel is free.
16.Slide latch head upward and remove it from door frame
with releasing latch spring from door frame and latch
head.
17.Now, latch head and latch spring are free.
18.Remove door screen from door frame by releasing two
(2) tabs.
19.Now, door screen is free.
RE-INSTALL
1. Re-install door screen to door frame by fitting two (2) tabs
of door frame to two (2) holes of door screen.
2. Re-install the latch spring to the latch head. Re-install the
latch spring to the door frame. Re-install latch head to
door frame.
3. Re-install door panel to door frame by fitting nine (9) tabs
of door frame to nine (9) holes of door panel.
4. Hold the door panel to the door frame by sliding the door
panel upward.
5. Put sealer film on door panel. Refer to "Sealer Film"
about how to handle new one.
6. Re-install choke cover to door panel by pushing.
7. Catch two (2) pins of door panel on two (2) hole of upper
and lower oven hinges.
8. Re-install the door stopper to the door assembly.
Note: After any service to the door;
(A) Make sure that door sensing switch and secondary
interlock switch are operating properly. (Refer to
chapter "Test Procedures".).
(B) An approved microwave survey meter should be
used to assure compliance with proper microwave
radiation emission limitation standards.
After any service, make sure of the following :
1. Door latch heads smoothly catch latch hook through
latch holes and that latch head goes through center 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 Microwave
Pin
Upper oven hinge
Door panel
Lower oven
hinge
Pin
Lower
oven
hinge
Door
stopper
Choke cover
Figure C-7. Door Replacement
SEALER FILM
Installation
1. Put the adhesive tape on the backing film of the sealer
film as shown in Fig. C-8.
2. Tear the backing film by pulling the adhesive tape.
3. Put the pasted side of the sealer film on the door panel
Sealer film
Backing film
Adhesive tape
Figure C-8. Sealer film
28
Page 55
R-310AK
R-330AK
R-330AW
1
A
B
BLKBLK
OVEN
THERMAL CUT-OUT
C
2
GRN
N
H
BLK
NOTE:
The grounding conductor of
the power supply cord has
been grounded by power
supply cord fixing screw.
The screw must allways be
kept tight.
WHT
3
POWER SUPPLY CORD
120V 60Hz
WHT
NOTE:
The neutral (WHT) wire must be
connected to the terminal with "N"
mark on the power supply cord.
45
RECTIFIER
H.V.
HIGH VOLTAGE
CAPACITOR
MAGNETRON
HIGH VOLTAGE COMPONENTS
RED
GRY
GRY
POWER
TRANSFORMER
6
A
B
C
WHT
OVEN LAMP
AND SOCKET
D
E
F
N.O.
DOOR
SENSING
G
ORG
BLUE MARK
NOTE:
Hot (ORG) wire must be
connected to the terminal
with blue mark on the
oven light socket.
GRY
GRN
COM.
SWITCH
BLK
GRY
BLK
GRN
CN-A
BLK
1
D
BLK
BLK
GRY
GRY
BLK
ORG
WHT
E
BLK
&
FUSE
HOLDER
FAN MOTOR
BLK
GRY
RED
N.C.
COM.
TURNTABLE
MOTOR
WHT
NO
MONITOR
SWITCH
SECONDARY
GRY
WHT
COM.
INTERLOCK
SWITCH
F
WHT
Figure S-1(a). Pictorial Diagram for the ovens until September 1996 production
G
BLK
RED
2
3 WHT
RY2 (COM)
RED
RY2 (N.O.)
AH SENSOR ( for R-330AK/AW only)
H
BLK
RED
WHT
CN-F
123
1
LSI
R-330AK/AW
CONTROL UNIT
CN-G
2
AB
123
CN-F
N.O.
COM.
CN-A
3
RY1
1
3
29
RY2
PRIMARY
INTERLOCK
RELAY
COM.
PRIMARY
INTERLOCK
RELAY
N.O.
RY2
RY1
1
3
CN-A
R-310AK
A
B
LSI
CONTROL UNIT
CN-G
45
H
6
Page 56
R-310AK
R-330AK
R-330AW
1
A
BLKBLK
B
OVEN
THERMAL CUT-OUT
C
2
GRN
N
H
BLK
NOTE:
The grounding conductor of
the power supply cord has
been grounded by power
supply cord fixing screw.
The screw must allways be
kept tight.
BLK
OUTER CASE
SWITCH (Upper)
N.O.
BLK
WHT
COM.
WHT
3
NOTE:
The neutral (WHT) wire must be
connected to the terminal with "N"
mark on the power supply cord.
POWER SUPPLY
CORD 120V 60Hz
N.O.
COM.
OUTER CASE
SWITCH (Lower)
WHT
WHT
45
RECTIFIER
H.V.
HIGH VOLTAGE
CAPACITOR
MAGNETRON
POWER
HIGH VOLTAGE COMPONENTS
RED
GRY
GRY
6
A
B
TRANSFORMER
C
D
OVEN LAMP
AND SOCKET
E
F
DOOR
G
ORG
WHT
BLUE MARK
Hot (ORG) wire must be
connected to the terminal
with blue mark on the
oven light socket.
NOTE:
GRY
GRN
N.O.
COM.
SENSING
SWITCH
BLK
GRY
BLK
GRN
CN-A
BLK
1
D
BLK
BLK
GRY
GRY
BLK
ORG
WHT
FAN MOTOR
TURNTABLE
MOTOR
BLK
2
3 WHT
&
FUSE
HOLDER
BLK
RY2 (COM)
BLK
RED
RY2 (N.O.)
RED
RED
GRY
N.C.
COM.
WHT
NO
MONITOR
SWITCH
SECONDARY
GRY
WHT
COM.
INTERLOCK
SWITCH
WHT
E
F
Figure S-1(b). Pictorial Diagram for the ovens from October 1996 production
7- 1XFPSD40P08K00Screw : 4mm x 8mm7AA
7- 2XFPSD30P06000Screw : 3mm x 6mm1AA
7- 3XHTSD40P08RV0Screw : 4mm x 8mm4AA
7- 4XHTSD40P12RV0Screw : 4mm x 12mm1AA
7- 5XOTSD40P12RV0Screw : 4mm x 12mm8AA
7- 6XOTSD40P12000Screw : 4mm x 12mm12AA
7- 7XOTSF40P08000Screw : 4mm x 8mm1AA
36
Page 63
HOW TO ORDER REPLACEMENT PARTS
To have your order filled promptly and correctly, please furnish the following information.
1. MODEL NUMBER2. REF. NO.3. PART NO.4. DESCRIPTION
Order Parts from the authrized SHARP parts Distributor for your area.
Defective parts required return should be returned as indicated in the Service Policy.
R-310AK
R-330AK
R-330AW
1
A
B
C
D
E
2
PACKING AND ACCESSORIES (R-310AK)
DOOR PROTECTION SHEET
SPADPA204WRE0
6- 8 INSTRUCTION BOOK
& PRINTING MATTER
6- 2 TURNTABLE TRAY
6- 1 TURNTABLE SUPPORT
3
45
TOP PAD ASSEMBLY
FPADBA341WRK0
CABINET COVER
SPAKHA003WRE0
PLASTIC BAG
SSAKHA034WRE0
BOTTOM PAD ASSEMBLY
FPADBA342WRK0
6
A
B
C
D
E
F
G
H
INTO THE
OVEN CAVITY
1
Not replaceable items.
2
TRAY PACK
SPADFA397WRE0
3
37
PACKING CASE
SPAKCC831WRE0
45
F
G
H
6
Page 64
R-310AK
R-330AK
R-330AW
1
2
OVEN AND CABINET PARTS (R-310AK)
A
4-18
1-11
B
4-9
1-4
C
4-17
6-7
1-10
3
7-5
7-3
4-10
7-2
1-13
4-19
45
2-1
7-1
6-9
1-8
4-16
6
7-5
A
7-5
B
7-7
C
6-6
D
4-7
E
4-12
4-14
F
2-2
G
7-6
2-4
1-12
4-22
7-1
4-11
7-5
7-5
4-15
4-3
4-13
1-1
1-1
1-14
1-2
1-1
1-3
4-21
7-6
1-1
7-6
7-5
1-9
4-20
1-5
7-3
for the oven from
Oct./ 1996 production
4-1
4-2
4-4
7-1
1-7
7-4
4-6
4-5
1-6
4-8
7-3
D
E
7-1
7-3
F
6-2
G
7-6
H
1
2-5
7-6
7-6
2
7-6
7-6
7-6
2-4
3
38
2-3
6-1
45
H
6
Page 65
R-310AK
5-8
5-2
5-5
5-1
5-4
5-3
5-6
5-7
Actual wire harness may be different from illustration.
6-4
6-5
6-3
(HIGH VOLTAGE TRANSFORMER)
(CAPACITOR)
3-2
3-6
3-5
3-3
3-1
3-4
3-9
3-7
3-8
3-2-1
3-1
Before attaching Control unit to
Control panel, Foil side of
Control unit must be cleaned by
ethyl-alcohol.
5-9
R-330AK
R-330AW
CONTROL PANEL, DOOR AND MISCELLANEOUS PARTS (R-310AK)
7- 1XFPSD40P08K00Screw : 4mm x 8mm7AA
7- 2XFPSD30P06000Screw : 3mm x 6mm2AA
7- 3XHTSD40P08RV0Screw : 4mm x 8mm4AA
7- 4XHTSD40P12RV0Screw : 4mm x 12mm1AA
7- 5XOTSD40P12RV0Screw : 4mm x 12mm10AA
7- 6XOTSD40P12000Screw : 4mm x 12mm12AA
7- 7XOTSF40P08000Screw : 4mm x 8mm [R-330AK]1AA
7- 7XOTSE40P08000Screw : 4mm x 8mm [R-330AW]1AA
HOW TO ORDER REPLACEMENT PARTS
To have your order filled promptly and correctly, please furnish the following information.
1. MODEL NUMBER2. REF. NO.3. PART NO.4. DESCRIPTION
Order Parts from the authrized SHARP parts Distributor for your area.
Defective parts required return should be returned as indicated in the Service Policy.
42
Page 69
R-310AK
R-330AK
R-330AW
1
2
OVEN AND CABINET PARTS (R-330AK/AW)
A
4-18
1-11
B
7-2
1-15
C
4-23
4-17
4-9
1-4
6-7
7-5
7-5
3
7-5
1-10
7-2
1-13
4-10
7-3
4-19
45
2-1
7-1
6-9
1-8
4-16
6
7-5
A
7-5
B
7-7
C
6-6
D
4-7
6-10
E
4-12
4-14
F
2-2
G
7-6
2-4
1-12
4-22
7-1
7-5
4-11
7-5
4-15
4-3
4-13
1-1
1-1
1-14
1-2
1-1
1-3
4-21
7-6
1-1
7-6
1-9
7-5
4-20
1-5
7-3
for the oven from
Oct./ 1996 production
4-1
4-2
4-4
7-1
1-7
7-4
4-6
4-5
1-6
4-8
7-3
D
E
7-1
7-3
F
6-2
G
7-6
H
1
2-5
7-6
7-6
2
7-6
7-6
7-6
2-4
3
43
2-3
6-1
45
H
6
Page 70
R-310AK
R-330AK
R-330AW
1
2
3
45
CONTROL PANEL, DOOR AND MISCELLANEOUS PARTS (R-330AK/AW)
A
3-1
3-3
3-5
3-4
3-9
3-2
B
C
3-2-1
3-6
3-1
Before attaching Control unit to
Control panel, Foil side of Control
unit must be cleaned by ethylalcohol.
D
5-5
6
A
B
C
5-8
D
E
F
G
3-7
5-9
3-8
5-2
5-1
E
5-4
5-3
F
5-6
G
5-7
H
Actual wire harness may be different from illustration.