R-3A54
R-2CC”
SHARP
SERVICE MANUAL
S4202R3A54PJ/
MICXOWAVE OVEN
MODELS
R-3A54
Photo R-3A54
R-3E54
In interests of user-safety the oven should be restored to its original
condition and only manufacturer original spare parts must be used.
(RD16101 U)
TABLE OF CONTENTS
Page
GENERAL
IMPORTANT INFORMATION
......................................................................................................
1
CAUTION, MICROWAVE
RADIATION,WARNING
......................................................................................
1
PRODUCT
SPECIFICATIONS
.........................................................................................................................
2
APPEARANCE
VIEW
........................................................................................................................................
3
OPERATION SEQUENCE
.................................................................................................................................
4
FUNCTION
OF
IMPORTANT COMPONENTS
...............................................................................
......................................................................................................................................
...?
............. 5
SERVICING
............. 7
TEST PROCEDURE
...........................................................................................................................................
9
TOUCH
CONTROL
ASSEMBLY ..................................................................................................................
17
COMPONENT
REPLACEMENT AND ADJUSTMENT
PROCEDURE
.....................................................
22
MICROWAVE
MEASUREMENT
/ WIRING DIAGRAM
.....................................................................
..!..
.........................................
28
.......................................................................................................................................
29
PICTORIAL DIAGRAM . ..................................................................................................................................
30
CONTROL PANEL
CIRCUIT
.........................................................................................................................
31
PRlN-I-ED WIRING
DIAGRAM
.....................................................................................................................
32
PARTS LIST
....................................................................................................................................................
33
PACKlNG
AND ACCESSORIES
...................................................................................................................
38
SHARP CORPORATION
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SERVICE MANUAL
SHARP
MICROWAVE OVEN
R-3A54/ R-3E54
GENERAL IMPORTANT INFORMATION
This Manual has been prepared to provide Sharp Corp. Service
engineers with Operation and Service Information.
It is recommended that service engineers carefully study the
entire text of this manual, so they will be qualified to render
satisfactory customer service.
(RD36106U)
CAUTION
MICROWAVE RADIATION
Service engineers should not be exposed to the micro-
wave energy which may radiate from the magnetron or
other microwave generating devices if it is improperly
used or connected. All input and output microwave
connections, waveguides, flanges and gaskets must be
secured. Never operate the device without a microwave
energy absorbing load attached. Never look into an
open waveguide or antenna while the device is ener-
gized.
(RD36203U)
WARNING
Never operate the oven until the following points are
ensured.
(A)The door is tightly closed.
(B)The door brackets and hinges are not defective.
(C)The door packing is not damaged.
(D)The door is not deformed or warped.
(E) There is not any other visible damage with the oven.
Servicing and repair work must be carried out only by
trained service engineers.
list are used at voltages
All the parts marked 11*11 on parts
more than 250V.
I
(RD5111 Ou)
R-3A54
R-3E54
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PRODUCT SPECIFICATIONS
“4 .
APPEARANCE VIEW
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OPERATING SEQUENCE
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FUNCTION OF IMPORTANT -“
SERVICING AND
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TEST PROCEDURE
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REPLACEMENT AND
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MICROWAVE MEASUREMENT
SHARP CORPORATION
OSAKA, JAPAN
(RD37201 U)
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PRODUCT SPECIFICATIONS
SPECIFICATION
ITEM
Power Requirements
240 Volts
50 Hertz
DESCRIPTION
Power Consumption
Power Output
Case Dimensions
Single phase, 3 wire earthed
I .3kW Approx. 6.0 A
800W (IEC-705-1988), 650W (AS 2895-l 986)
Operating frequency of 2450M Hz
Width 520mm
._ Height 294mm
Depth 388mm
Cooking Cavity Dimensions
Width 350 mm
Height 197 mm
Depth 368 mm
Turntable diameter
Control Complement
325mm
Touch Control System
Clock( I:00 - 12:59 )
Timer (0 - 99 minutes 99 seconds )
Microwave Power for Variable Cooking
Repetition Rate;
HIGH
. . . . . . . . ..*...................... Full power throughout the cooking time
MEDIUM
HIGH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
approx. 70% of Full
Power
MEDIUM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
approx.
50% of Full Power
MEDIUM LOW . . ..*...............*........*.......... approx. 30% of Full Power
LOW
*..................,.................................,.... approx. 10% of Full Power
AUTO COOK (R-3A54 only)
EASY DEFROST
Set Weight
INSTANT COOK/START
LESS/MORE (R-3A54 only)
AUTO START/CLOCK
POWER LEVEL
INSTANT ACTION (8 menu)
NUMBER”
STOP/CLEAR
Approx. 16.0 kg
,PnA*,n, 1 I
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GENERAL INFORMATION
WARNING
THIS APPLIANCE MUST BE EARTHED
IMPORTANT
THE WIRES IN THIS MAINS LEAD ARE COLOURED IN ACCORDANCE WITH THE FOLLOWING CODE:
GREEN-AND-YELLOW
: EARTH
BLUE
: NEUTRAL
BROWN
: LIVE
i
NOTE: Numbers and letters shown after sentences such as “RD44101 U” are for factory use only.
2
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APPEARANCE VIEW
1.
Ventilation
openings 4.
Safety door
latches
2.
Oven lamp
5. See through
door
3.
Hinges
6. Coupling
TOUCH CONTROL PANEL
a-
INSTANT ACnON
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e
1
2xw 3xw 4xw
67890
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R-3A54
7. Door open button
8. Touch control panel
9. Digital readout
10. Wave guide cover
11. Access cover for oven
lamp replacement
12. Power supply cord
a-
d
1
INSN.NT.UTION
h
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2xw 3xw 4xw
67800 “j
R-3E54
a. INSTANT ACTION PADS f. STOP/CLEAR PAD
Press once to cook or reheat 8 popular
j. 4 SERVE QUANTITY PAD
Press to erase during programming. Press
To cook four serves, press this pad prior
menu.
once to stop operation of oven during
to pressing the INSTANT ACTION pad.
b. AUTO COOK
Press to select Auto Cook mode.
c. AUTO COOK MENUS
cooking; press twice to cancel cooking
k. EASY DEFROST PAD
programme.
Press to defrost meat by entering weight
AUTO START/CLOCK PAD
Press to set clock or Auto Start time
d. NUMBER PADS
Press to enter cooking times, clock time,
weight or quantity of food, or to select the
Auto Cook menus.
e. POWER LEVEL PADS
Press to select microwave power setting.
If not pressed, HIGH is automatically se-
lected.
g.
h.
2 SERVE QUANTITY PAD
To cook two serves, press this pad prior
to pressing the INSTANT ACTION pad.
3 SERVE QUANTITY PAD
To cook three serves, press this pad prior
to pressing the INSTANT ACTION pad.
I. MORE(A), LESS(v) PADS
Press to increase/decrease the time in one
minute increments during cooking or to
alter the doneness for Auto Cook, Instant
Action or Easy Defrost modes.
m. INSTANT COOK/START PAD
Press once to cook for 1 minute at HIGH
or increase by 1 minute multiples each
time this pad is pressed during cooking.
Pressed to start oven after setting
programmes.
3
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OPERATING SEQUENCE
OFF CONDITION
Closing the door activates all door interlock switches
(1 st latch switch, 2nd latch switch and stop switch).
IMPORTANT
When the oven door is closed, the monitor switch
contacts (COM -
NC) rnust be open.
When the microwave oven is plugged in a wall outlet.
Rated voltage is supplied to the point A3+ A5 in the
control unit.
1.
3
L.
3.
Figure O-l on page 29
The display flashes “88:88”. -
To set any programmes or set the clock, you must
first touch the STOP/CLEAR key.
11 .
. II appears in the display and the time counts
up every minute.
NOTE: When the oven door is opened, the oven
lamp comes on at this time.
MICROWAVE COOKING CONDITION
HIGH COOKING
Enter a desired cooking time with the touching Number
key and start the oven with touching START key.
Function sequence
1.
2.
3.
4.
5.
Figure O-2 on page 29
CONNECTED COMPONENTS
RELAY
Oven lamp, Fan motor, Turntable motor
RYl
Power transformer
RY2
Rated voltage is supplied to the primary winding of
the power transformer. The voltage is converted to
about 3.3 volts A.C. output on the filament winding
and high voltage of approximately 2000 volts A.C.
on the secondary winding.
The filament winding voltage (3.3 volts) heats the
magnetron filament and the high voltage (2000
volts) is sent to the voltage doubling circuit, where
it is doubled to negative voltage of approximately
4000 volts D.C..
The 2450 MHz microwave energy produced in the
magnetron generates a wave length of 12.24 cm.
This energy is channeled through the waveguide
(transport channel) into the oven cavity, where the
food is placed to be cooked.
When the cooking time is up, a signal tone is heard
and the relays RYI + RY2 go back to their home
position. The circuits to the oven lamp, power
transformer, fan motor and turntable motor are cut
off.
When the door is opened during a cook cycle, the
switches come to the following condition.
CONDITION
DURING
DOOR OPEN
SWITCH
CONTACT
COOKING (NO COOKING)
1st latch switch
COM - NO
Closed
Open
Monitor switch
COM -NC
Open
Closed
2nd latch switch COM - NO
Closed
Open
Stop switch COM - NO
Closed
Open
The circuits to the power transformer, fan motor and
turntable motor are cut off when the 1st latch
switch, 2nd latch switch and stop switch are made
open.
The oven lamp remains on even if the oven door is
opened after the cooking cycle has been inter-
rupted, because the relay RYI stays closed. Shown
in the display is the remaining time.
6. MONITOR SWITCH CIRCUIT
The monitor switch is mechanically controlled by
oven door, and monitors the operation of the 1 st
and 2nd latch switches.
6-l
When the oven door is opened during or after the
cycle of a cooking program, the 1 st latch, 2nd
latch and stop switches must open their contacts
first. After that the contacts (COM - NC) of the
monitor switch can be closed.
6-2
When the oven door is closed, the contacts
(COM -NC) of the monitor switch must be
opened. After that the contacts of the 1st latch,
2nd latch and stop switches are closed.
6-3. When the oven door is opened and the contacts
of the 1st and 2nd latch switches remain closed,
the fuse M8A will blow because the monitor
switch is closed and a short circuit is caused.
MEDIUM HIGH, MEDIUM, MEDIUM LOW,
LOW COOKING
When the microwave oven is preset for variable cook-
ing power, 240 volts A.C. power is supplied to the
power transformer intermittently within a 32-second
time base through the relay contact which is coupled
with the current-limiting relay. The following levels of
microwave power are given.
SETTING
32 sec. ON
HIGH
MEDIUM HIGH
MEDIUM
MEDIUM LOW
LOW
24 sec. ON 8 sec. OFF
18 sec. ON
14 sec. OFF
J-1 Approx. 50%
12 sec. ON 20 sec. OFF
6 sec. ON 26 sec. OFF
J-1 Approx 10%
NOTE: The ON/OFF time ratio does not exactly corre-
spond to the percentage of microwave power,
because approx. 2 seconds are needed for
heating up the magnetron filament.
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FUNCTION OF IMPORTANT COMPONENTS
DOOR OPEN MECHANISM
The door can be opened by pushing the door open
button on the control panel. When the door open but-
ton is pushed, the switch lever is moved upward, op-
erating the latch head.
The latch head is moved
upward, and released from the latch hook. Now, the
door can be opened.
Door--&+
Switch
lever
Stop switch
‘.
‘. .\
*.
‘.
Figure D-l. Door Open Mechanism
IST LATCH, 2ND LATCH AND STOP SWITCHES
1. When the oven door is closed, the contacts (COM
2. When the oven door is opened, the contacts (COM
-NO) must be opened.
-NO) must be closed.
MONITOR SWITCH
1. When the oven door is closed, the contacts
(COM-NC) must be opened.
2. When the oven door is opened, the contacts
(COM - NC) must be closed.
3. If the oven door is opened and the contacts
(COM - NO) of the 1st and 2nd latch switches fail
to open, the fuse M8A blows simultaneously with
closing the contacts (COM -NC) of the monitor
switch.
CAUTION: BEFORE REPLACING A BLOWN FUSE F
M8A TEST THE IST AND 2ND LATCH
SWITCHES, MONITOR SWITCH AND
MONITOR RESISTOR FOR PROPER OP-
ERATION.
MONITOR RESISTOR R 0.8 I2 20W
The monitor resistor prevents the fuse M8A bursting
when the fuse M8A blows due to the operation of the
monitor switch.
ASYMMETRIC RECTIFIER
The asymmetric rectifier is a solid state device that
prevents current flow in both directions. And it pre-
vents the temperature rise of the power transformer by
blowing the fuse M8A when the high voltage rectifier
is shorted.
The rated peak reverse voltage of Dl of the asymmetric
rectifier is 6 KV The rated peak reverse voltage of D2
of the asymmetric rectifier is 1.7 KV. Dl and D2 of the
asymmetric rectifier or high voltage rectifier are shorted
when the each peak reverse voltage goes beyond the
each rated peak reverse voltage. (The process of
blowing the fuse M8A.)
1. The high voltage rectifier is shorted by any causes
when microwave cooking.
2. The peak reverse voltage of D2 of the rectifier goes
beyond the rated peak reverse voltage 1.7 KV in the
voltage doubler circuit.
6. The fuse M8A blows by the large electric currents.
7. The power supply to the all electrical parts is cut
off.
3. D2 of the rectifier is shorted.
4. The large electric currents flow through the high
voltage winding of the power transformer.
5. The large electric currents beyond 6.3A flow
through the primary widing of the power transfor-
mer.
FUSE M8A
1. The fuse M8A blows when the contacts
(COM -NO) of the 1 st latch switch and 2nd latch
switch remain closed with the oven door open and
when the monitor switch closes.
2. The fuse M8A also blows when asymmetric rectifier,
H.V. rectifier, H.V. wire harness, H.V. capacitor,
magnetron or secondary winding of power trans-
former is shorted.
3. If the wire harness or electrical components are
short-circuited, the fuse M8A blows to prevent an
electric shock of fire hazard.
THERMAL CUT-OUT 145°C (MG)
This thermal cut-out protects the magnetron against
overheat. If this temperature goes up higher than
145°C because the fan motor is interrupted, the venti-
lation openings are blocked, the thermal cut-out will
open and the line voltages to the power transformer
will be cut off and the operation of the magnetron will
be stopped.
The defective thermal cut-out must be
replaced with new one.
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THERMAL CUT-OUT 145°C (OVEN)
The thermal cut-out located on the top of the oven
cavity is designed to prevent damage to the oven if the
food in the oven catch fire due to over heating
produced by upper setting of cook time or failure of
control unit. Under normal operation, the oven thermal
cut-out remain closed.
However, when abnormally
high temperatures are reached within the oven cavity,
the oven thermal cut-out will open at 145OC, causing
the oven to shut down. The defective thermal cut-out
must be replaced with new one.
TURNTABLE MOTOR
The turntable motor drives coupling to rotate the
turntable.
FAN MOTOR
The fan motor drives a blade which draws external cool
air. This cool air is directed through the air vanes sur-
rounding the magnetron and cools the magnetron.
This air is channeled 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.
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SERVICING
WARNING TO SERVICE PERSONNEL
Microwave ovens contain circuitry capable of producing very high voltage and current, contact with any part
of the high voltage circuit will result in electrocuition.
REMEMBER TO CHECK 3D
1) Disconnect the supply.
2) Door opened, and wedged open.
3) Discharge high voltage capacitor.
I-
WARNING AGAINST THE CHARGE OF THE
HIGH-VOLTAGE CAPACITOR
The high-voltage capacitor remains charged
about 60 seconds after the oven has been
switched off. Wait for 60 seconds and then
short-circuit
the
connection of
the
high-voltage capacitor (that is, of the con-
necting lead of the high-voltage rectifier)
against the chassis with the use of an insu-
lated screwdriver.
Sharp
recommend
that wherever possible
fault-finding is carried out with the supply discon-
nected. It may in, some cases, be necessary to
connect the supply after the outer case has been
removed, in this event carry out 3lJ checks and then
disconnect the leads to the primary of the power
transformer. Ensure that these leads remain isolated
from other components and the oven chassis. (Use
insulation tape if necessary.) When the testing is
completed carry out 3D checks and reconnect the
leads to the primary of the power transformer.
REMEMBER TO CHECK $lJ
1) Reconnect all leads removed from components
during testing.
2) Replace the outer case (cabinet).
3) Reconnect the supply.
4) Run the oven. Check all functions.
Microwave ovens should not be run empty. To test
for the presence of microwave energy within a
cavity, place a cup of cold water on the oven
turntable, close the door and set the microwave
timer for two (2) minutes. Set the power level to
HIGH and push the START button. When the two
minutes has elapsed (timer at zero) carefully check
that the water is now hot. If the water remains cold
carry out 3lJ checks and re-examine the con-
nections to the component being tested.
When all service work is completed, and the oven is fully assembled, the microwave power output should
be checked and a microwave leakage test carried out.
TROUBLESHOOTING GUIDE
When troubleshooting the microwave oven, it is
helpfull to follow the Sequence of Operation in per-
forming 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 be-
cause of a blown fuse (M8A) in the
1 st latch switch - 2nd latch switch -
monitor switch
- monitor resisitor cir-
cu-it, check the 1st latch switch, 2nd
latch switch, monitor switch and
monitor resistor before replacing the
fuse (M8A).
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RE = Replace / CK = Check
TEST PROCEDURE
P
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:ONDITION
IN
:ONDITION
POSSIBLE
CASE AND
&Xl;ECTIVE
PROBLEM
iome fuse blows when power supply cord is
slugged into wall outlet.
-USE M8A blows when power supply cord is
slugged into wall outlet.
‘88:88” does not appear in display but power
jupply cord is plugged into wall outlet.
3isplay does not operate properly when
STOP/CLEAR key is touched.
3ven lamp does not light at door opened.
: Display appears.)
3ven does not start when the START pad is
ouched. (Display appears)
3ven lamp does not light
:Display appears.)
-an motor does not operate.
(Display appears.)
Turntable motor assembly does not operate.
(Display appears.)
Oven or any electrical parts does not stop
But cooking time is 0 or STOP/CLEAR key
touched
Oven seems to be operating but little or no heat
is produced in oven load. (Microwave power level
is set at HIGH)
-
Oven does not seems to be operating properly
when MEDIUM HIGH, MEDIUM, MEDIUM LOW
or LOW is set. (Oven operates properly at HIGH
and then the STOP/CLEAR pad is touched the
oven stops.)
Oven goes into cook cycle but shuts down before
end of cooking cycle.
Oven stops as soon as when the START pad is
touched.
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TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
A
MAGNETRON TEST
’ NEVER TOUCH ANY PART IN THE CIRCUIT WITH YOUR HAND OR AN INSULATED
TOOL WHILE THE OVEN IS IN OPERATION.
____-- -----_____-_.. __ _____ _ _
CARRY OUT 3D CHECKS
Isolate the magnetron from the high voltage circuit by removing all leads connected to the filament
terminal.
To test for an open circuit filament use an ohmmeter to make a continuity test between the
magnetron filament terminals, the meter should show a reading of less than 1 ohm.
To test for a short circuit filament to anode condition, connect ohmmeter between one of the fil-
ament terminals and the case of the magnetron (ground). This test should be indicated an infinite
resistance. If a low or zero resistance reading is obtained then the magnetron should be re
laced.
(R g 82AOl U)
MICROWAVE OUTPUT POWER (2 LITRE WATER LOAD)
The following test procedure should be carried out with the microwave oven in a fully assembled
condition (with outer case fitted). Microwave output power from the magnetron can be measured
by way of substitution, i.e. it can be measured by using a water load how much it can be absorbed
by the water load. To measure the microwave output power in the microwave oven, the relation
of calorie and watt is used. On the other hand, if the temperature of the water with V(ml) rises
AT (“C) during this microwave heating period, the calorie of the water is V x AT.
The formula is as follows;
p=
8330 x AT
t
Our condition for the water load is as follows:
/
Room temperature
. . . . ..*..................... 23 + 2°C Power supply Voltage . . . . . . . . . . . . . Rated voltage /
Water load
. . . ...2000 ml Initial temperature
. . . . ...23&1 “C Heating time . . . . . . . . 2min. 8 sec. j
P=65xAT
Measuring method:
A) Use two 1 litre Pyrex beakers with a diameter of approximately of 12cms.
B) Place 1 litre of 10°C water in each beaker.
C) Mark Tl on the one beaker and mark T2 on the other one. And stir the water and measure the
temperature of water the thermometer and note them. The graduation of the thermometer must
be scaled by 0.1 “C at minimum and an accurate mercury thermometer is recommended.
D) Place the two beakers as touching each other in the centre of the cavity.
E) Set the timer to 2minute and 8 seconds at 100% power (the time required to raise the water
temperature 10 degrees C.)
F) The time must be measured with stopwatch or wristwatch.
G) After 2minute and 8 seconds stop the oven by opening the door.
H) Remove the two beakers from the oven and measure the temperature of the water by stiring the
water with the thermometer and noting the readings.
Example
Initial temperature
Tl = 10°C
T2 =
...............................................................................
11 “C
Temperature after 2min.
8 sec. ..........................................................
Tl =
20°C T2 = 21 “C
Temperature difference Cold-Warm
........................................... AT1 = 10°C
AT2 = 10°C
Mean temperature rise AT ........
AT = (AT1 +AT2) / 2 - (IOOC + IO’C) / 2 = 10°C
Measured output power
The equation is “P= 65 x AT”
...................................................
P= 65 x 10°C = 650 Watts
NOTE: The measured output power should be at least +I5 % of the rated output
power.
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TEST PROCEDURES (CONT’D)
PROCEDURE
LETTER
COMPONENT TEST
CAUTION: 1 “C CORRESPONDS TO 65 WATTS.
REPEAT MEASUREMENT IF THE POWER IS INSUFFICIENT.
(Tl “C)
(T2 W
(T2 OC,*
Heat up for 2min. 8 sec.
MICROWAVE OUTPUT POWER (1 LITRE WATER LOAD)
(RD82A02J)
The following test procedure should be carried out with the microwave oven in a fully assembled
condition (outer case fitted). Microwave output power from the magnetron can be measured by
way of IEC 705, i.e. it can be measured by using water load how much it can be absorbed by the
water load. To measure the microwave output power in the microwave oven, the relation of cal-
orie and watt is used. When P(W) heating works for t(second), approximately P x t/4.1 87 calorie
is generated. On the other hand, if the temperature of the water with V(ml) rises AT (“C) during
this microwave heating period, the calorie of the water is V x AT.
The formula is as follows;
Pxt/4.‘l87=VxAT P(W)=4.187xVxAT/t
I Our condition for the water load is as follows:
Room temperature... . . . . . . . . . . . . . . . . . . around
20°C
Power supply Voltage . . . . . . . . . . . . . Rated
voltage
Water load . . . . . . . . 1000
g
Initial temperature . . . . . . . 10+2”C
Heating time . . . . . . . . . . . . . . . . 52 sec.
P=80xAT
Measuring condition:
1. Container
The water container must be a cylindrical borosilicate glass vessel having a maximum material
thickness of 3 mm and an outside diameter of approximately 190 mm.
2. Temperature of the oven and vessel
The oven and the empty vessel are at ambient temperature prior to the start of the test.
3. Temperature of the water
The initial temperature of the water is (10 + 2)“C.
4. Select the initial and final water temperature so that the maximum difference between the final
water temperature and the ambient temperature is 5K.
5. Select stirring devices and measuring instruments in order to minimize addition or removal of
heat.
6. The graduation of the thermometer must be scaled by O.l”C at minimum and an accurate
thermometer.
7. The water load must be (1000 f. 5) g.
8. “t” is measured while the microwave generator is operating at full power. Magnetron filament
heat-up time is not included.
NOTE: The operation time of the microwave oven is “t + 2” sec. 2 sec. is magnetron filament
heat-up time.
Measuring method:
1. Measure the initial temperature of the water before the water is added to the vessel.
(Example: The initial temperature Tl, = 11 “C)
2. Add the 1 litre water to the vessel.
3. Place the load on the centre of the shelf.
,
4. Operate the microwave oven at HIGH for the temperature of the water rises by a value A T of
10 + 2°C
5. Stir the water to equalize temperature throughout the vessel.
6. Measure the final water temperature. (Example: The final temperature T2 = 21 “C)
7. Calculate the microwave power output P in watts from above formula.
10
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TEST PROCEDURES (CONT’D)
PROCEDURE
LETTER
COMPONENT TEST
F
THERMAL CUT-OUT TEST
CARRY OUT 30 CHECKS
Disconnect the leads from the terminals of the thermal cut-out. Then using an ohmmeter, make
a continuity test across the two terminals as described in the table below.
CARRY OUT $FJ CHECKS
Table: Temberature Fuse or Thermal Cut-out Test
Parts Name
Temperature of “ON”
Temperature of “OFF”
condition (closed circuit).
condition (open circuit).
Thermal cut-out
(Magnetron) -20°C
I
Thermal cut-out
(Oven)
I
-2ok
Indication of ohmmeter
(When room temperature is
approx. 20°C.)
145Oc Closed circuit
145°C
I
Closed circuit
If incorrect readings are obtained, replace the thermal cut-out.
An open circuit thermal cut-out
(Magnetron) indicates that the magnetron has overheated, this may be due to resistricted venti-
lation, cooling fan failure or a fault condition within the magnetron or HV circuit.
An open circuit thermal cut-out (Oven) indicates that the foods in the oven may catch fire, this
may be due to over heating produced by improper setting of the cooking timer or failure of the
control panel.
G
MONITOR RESISTOR TEST
CARRY OUT 3D CHECKS.
Disconnect the leads from the monitor resistor or surge resistor.
Using an ohmmeter and set on a low range.
Check between the terminals of the monitor resistor or surge resistor as described in the follow-
ing table.
Table: Resistance
I
Resistor I Resistance I
I
Monitor resistor
I
Approx. 0.8 ohms
I
If incorrect readings are obtained, replace the monitor resistor or surge resistor
CARRY OUT 4R CHECKS.
H
MOTOR WINDING TEST
CARRY OUT 3D CHECKS
Disconnect the leads from the motor. Using an ohmmeter, check the resistance between the two
terminals as described in the table below.
Table: Resistance of Motor
Motors
Resistance
Fan motor
Approximately 326 ohms
Turntable motor
1 Aooroximatelv 16.08 kohms I
If incorrect readings are obtained, replace the motor.
(Also refer to test procedure I)
CARRY OUT @ CHECKS
13
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TEST PROCEDURES (CONT’D)
PROCEDURE
LETTER COMPONENT TEST
I
LIVE TEST FOR MOTOR WINDINGS
CAUTION: The following procedure requires the oven to be connected to the supply
and should only be used if the relevant “cold” checks for the motor un-
der test are inconclusive.
1. CARRY OUT3JCHECKS
2. Disconnect the leads from the primary of the power transformer. Make sure that the leads
remain isolated from other oven components and chassis. (Use insulation tape if necessary,)
3. Connect a voltmeter, set to 250V AC, across the motor terminals. (Refer to the relevant motor
test procedure or pictorial diagram for the correct terminal numbers.)
4. Arrange the meter in a position where it can be read during the test. (Do not touch the meter,
meter leads or oven circuitry while the oven is active.)
5. Close the oven door.
6. Set the relevant timer for about three (3) minutes, set the power level to HIGH and push the
START button.
7. Note the reading on the meter and carefully observe the motor under test to see if it is turning.
8. CARRY OUT 3D CHECKS
9. Remove test meter leads.
1 O.Reconnect the leads to the primary of the power transformer.
If a reading of 240 volts AC was obtained (step 7) but the motor was not turning then it is faulty
and should be replaced. If the meter indicated that no supply was present then the wiring to the
motor should be checked for continuity.
J
BLOWN FUSE F M8A
CARRY OUT 3D CHECKS
1. If the fuse M8A is blown, there could be a shorts or ground in electrical parts or wire harness.
Check them and replace the defective parts or repair the wire harness.
2. If the fuse M8A is blown when the door is opened, check the 1st latch switch, 2nd latch
switch, monitor switch and monitor resistor.
If the fuse M8A is blown by incorrect door switching replace the defective switch(s) and the
fuse M8A.
3. If the fuse M8A is blown, there could be a short in the asymmetric rectier or there could be
a ground in wire harness.
A short in the asymmetric rectifier may have occured due to short
or ground in H.V. rectifier, magnetron, power transformer or H.V. wire. Check them and re-
place the defective parts or repair the wire harness.
CARRY OUT 4J CHECKS
CAUTION: Only replace fuse with the correct value replacement.
K TOUCH 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 di-
vided into two units, Control Unit ‘and Key Unit, and troubleshooting by unit replacement is de-
scribed according to the symptoms indicated.
1. Key Unit.
The following symptoms indicate a defective key unit. Replace the key un t.
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, Replace the COI
2-l In connection with pads.
trol unit.
a) When touching the pads, a certain group of pads do not produce a signal.
14
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TEST PROCEDURES (CONT’D)
PROCEDURE
LETTER
COMPONENT TEST
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 troubles 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.
d) Proper temperature measurement is not obtained.
RELAY TEST
1.
2.
3.
4.
5.
6.
CARRY OUT 3D CHECKS
Disconnect the leads from the primary of the power transfomer. Make sure that the leads re-
main isolated from other oven components and chassis. (Use insulation tape if necessary,)
Close the door.
Reconnect the supply.
Check the voltage between Pin Numbers 3 and 5 of 4-pin connector (A) on the control unit
with an A.C. voltmeter. The meter should indicated 240 volts, if no check oven circuit.
RYI AND RY2 TEST
These are operated by D.C. voltage. Check voltage at 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 di-
ode is good, control unit is defective.
RELAY SYMBOL
OPERATIONAL VOLTAGE
CONNECTED COMPONENTS
RYl
Approx. 26.5V.D.C.
Oven lamp/Turntable motor/Cooling fan motor
-____
RY2
Approx. 25.8V.D.C. Power transformer
15
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TEST PROCEDURES (CONT’D)
PROCEDURE
,
LETTER COMPONENT TEST
M
PROCEDURES TO BE TAKEN WHEN THE FOIL PATTERN ON THE PRINTED WIRING
BOARD (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 trou-
bleshooting guide given below for repair.
Problem: POWER ON, indicator does not light up.
/STEPS I OCCURANCE
CAUSE OR CORRECTION
1 ’
1 The rated AC voltage is not present at POWER ter- Check supply voltage and oven power cord. Please
j minal of CPU connector (CN-A)
use term “Low voltage transformer” when refering to
transformer Tl
2
i
1 The rated AC voltage is present at primary side of low
Low voltage transformer or secondary circuit defec-
i voltage transformer. tive. Check and repair.
‘3
Only pattern at “a” is broken.
“Insert jumper wire Jl and solder.
4
Pattern at “a” and “b” are broken. ‘Insert the coil RCILF2003YAZZ between “c” and
“d”.
I
NOTE:’
At the time of these repairs, make a visual in-
spection of the varistor for burning damage
and examine the transformer with tester for the
presence of layer short-circuit (check primary
coil resistance).
If any abnormal condition is detected, replace
the defective parts.
16
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TOUCH CONTROL PANEL ASSEMBLY
OUTLINE OF TOUCH CONTROL PANEL
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
The key unit is composed of a matrix, signals generated
in the LSI are sent to the key unit through ROo - RO
3, RIO - R13.
When a key pad is touched, a signal is completed
through the key unit and passed back to the LSI
through R23, R30 -
R32 to perform the function that
was requested.
Control Unit
Control unit consists of LSI, power source circuit,
synchronizing signal circuit, ACL circuit, buzzer circuit
and indicator circuit.
‘1)
2)
3)
LSI
This LSI controls the key strobe signal, relay driving
signal for oven function and indicator signal.
Power Source Circuit
This circuit generates voltage necessary in the
control unit.
Symbol Voltage Application
VC
-5v LSI (ICI)
VP -29v Fluorescent display tube : Grid
and anode voltage
VFI 3Vac Filament of fluorescent display
tube
VF2 (VFI to VF2 voltaae)
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 verv small error because it works
4)
ACL Circuit
A circuit to generate a signal which resets the LSI
to the initial state when power is supplied.
(RD919A4U)
5)
Buzzer Circuit
The buzzer responsive to signals from the LSI to
emit noticing sounds (key touch sound and com-
pletion sound).
6)
Door Sensing Switch
A switch to “tell” the LSI if the door is open or
closed.
7)
Relay Circuit
To drive the magnetron, fan motor, turntable motor
and light the oven lamp.
8)
Indicator Circuit
Indicator element is a Fluorescent Display.
Basically, a Fluorescent Display is a triode having
a cathode, a grid and an anode. Usually, the cath-
ode of a Fluorescent Display is directly heated and
the filament serves as cathode.
The Fluorescent Display has 6-digits, 13-segments
are used for displaying figures.
on commercial frequency.
(RD918A2U)
17
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LSI(IZA415DR)
The I/O signals of
DESCRIPTION OF LSI
the LSI(IZA415DR) are detailed in the following table.
PIN NO. / 1
1 SIGNAL 1 DIO
I
I/O
) OUT
Digit selection sianal.
Refer to the touch control panel circuit about the relation between signals and digits.
Normally, one pulse is output in every synchronized signal period, and input to the grid of the fluorescent display.
PIN NO. / 2
1 SIGNAL j D?l
I
I/O
1 OUT
Segment data signals.
Refer to the touch control panel circuit for the relationship between signals and indicators.
Normally, one pulse is output in every synchronized signal period, and input to the anode of the fluorescent display.
PIN NO. 1 3 1 SIGNAL 1 TGI
I
I/O
/ OUT
Signal to sound buzzer.
A: Key touch sound (0.12 sec.).
B: Completion sound (2.4 sec.).
PIN NO. 1 4
1 SIGNAL 1
Vdisp
I
I/O
1 IN
Anode (segment) of Fluorescent Display illumination voltage: -29V
Vp voltage of power source circuit input.
PIN NO. 1 5
Segment data signal.
Signal similar to Dl 1.
1 SIGNAL 1 ROo
I
I/O
1 OUT
Kev strobe signal.
Signal applied to touch-key section.
A pulse signal is input to R23, R30 -
R32 terminal while one of Gl line keys on key matrix is touched.
PIN NO. / 6
Segment data signal.
Signal similar to Dl 1.
1 SIGNAL /
ROI
I
I/O
/ OUT
Kev strobe signal.
Signal applied to touch-key section. A pulse signal is input to R23, R30 -
R32 terminal while one of G2 line keys on key matrix is touched.
PIN NO. 1 7
Segment data signal.
Signal similar to Dl 1.
1 SIGNAL 1 RO2
I
I/O
1 OUT
Kev strobe sianal.
Signal applied to touch-key section. A pulse signal is input to R23, R30 -
R32 terminal while one of G3 line keys on key matrix is touched.
PIN NO. 1 8
Segment data signal.
Signal similar to Dl 1.
1 SIGNAL ( RO3
I
l/O
1 OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to R23, R30 -
R32 terminal while one of G4 line keys on key matrix is touched.
PIN NO. 1 9
Segment data signal.
Signal similar to Dl 1.
1 SIGNAL 1
RIO
I
I/O
/ OUT
Key strobe signal.
Signal applied to touch-key section.
A pulse signal is input to R23, R30 -
R32 terminal while one of G5 line keys on key matrix is touched.
PIN NO. / 10
Segment data signal.
Signal similar to Dl 1.
1 SIGNAL / RI1
I
I/O
/ OUT
Key strobe signal.
Signal applied to touch-key section.
A pulse signal is input to R23, R30 -
R32 terminal while one of G6 line keys on key matrix is touched.
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PIN NO. 1 11
1 SIGNAL / RI2
I
I/O
j OUT
Seqment data siqnal.
Signal similar to Dl 1.
Kev strobe siqnal.
Signal applied to touch-key section.
A pulse signal is input to R23, R3o -
R32 terminal while one of G7 line keys on key matrix is touched.
PIN NO. 12
Seqment data siqnal.
Signal similar to Dl 1.
SIGNAL RI3
I
I/O
1 OUT
Kev strobe siqnal.
Signal applied to touch-key section.
A pulse signal is input to R23, R3o -
R32 terminal while one of G8 line keys on key matrix is touched.
PIN NO. / 13-15
1 SIGNAL 1 R20- R22
I
I/O
j OUT
Seqment data siqnal. Signal similar to Dll.
(RD939A2U)
PIN NO. 1 16
1 SIGNAL 1 R23
I
l/O
/ IN
Signal cominq from touch kev.
When either one of G9 line keys on key matrix is touched, a corresponding signal out of ROo - ROs, RI o - RI 3
will be input into R23.
When no key is touched, the signal is held at “L” level.
1 SIGNAL / R30
I
I/O
/ IN
PIN NO. j 17
Siqnal cominq from touch kev.
When either one of GIO line keys on key matrix is touched, a corresponding signal will be input into R30.
PIN NO.
1 18
1 SIGNAL 1 R31
1 I/O 1 IN
Siqnal cominq from touch kev.
When either one of Gll line keys on key matrix is touched, a corresponding signal will be input into R31.
1 SIGNAL 1
R32
I
I/O
1 IN PIN NO. 1 19
Siqnal cominq from touch kev.
When either one of G12 line keys on key matrix is touched, a corresponding signal will be input into R32
PIN NO. / 20 1 SIGNAL 1 INT 1
I
I/O
IN
Siqnal svnchronized with commercial source frequencv(50Hz).
This is the basic timing for time processing of LSI.
PIN NO. 1 21 1 SIGNAL 1 GND
Power source voltaqe: -5V
VC voltage of power source circuit input.
I
I/O
1 IN
PIN NO. / 22
Connected to GND.
1 SIGNAL / AVCC
I
I/O
/ IN
PIN NO. 1 23,24
Connected to VC.
1 SIGNAL 1 ANO,ANl
I
I/O
1 IN
PIN NO. 1 25
Terminal not used.
1 SIGNAL 1 AN2
I
I/O
IN
1 SIGNAL / AN3
I
I/O
IN
PIN NO. / 26
Input siqnal which communicates the door open/close information to LSI.
Door closed; “H” level signal.
Door opened;
“L” level signal.
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PIN NO. j 27
1 SIGNAL / AVSS
I
I/O
/ IN
Connected to VC.
PIN NO. 1 28
Auto clear terminal.
1 SIGNAL / RESET
I
l/O
IN
Signal is input to reset the LSI to the initial state when power is supplied.
Temporarily set to “H” level the moment power is supplied, at this time the LSI is set.
Thereafter set at “L” level.
PIN NO. / 29
Connected to GND.
1 SIGNAL 1
TEST
I
I/O
/ IN
PIN NO. 1 30
1 SIGNAL 1 OSCI
I
I/O
1 IN
Internal clock oscillation freauen’cv input setting.
The internal clock frequency is set by inserting the ceramic filter oscillation circuit with respect to OSCI terminal.
PIN NO. / 31 1 SIGNAL j OSC2
Internal clock oscillation frequencv control output.
Output to control oscillation input of OSC2.
I
I/O
1 OUT
PIN NO. 1 32 1 SIGNAL ) VCC
I i/O
1 IN
Power source voltage input terminal.
Connected to GND.
PIN NO.
I 33
1 SIGNAL 1 DO
1 I/O 1 OUT
Terminal not used.
PIN NO. 34 1 SIGNAL / Dl
I
I/O
1 OUT
Magnetron High-voltane circuit drivino signal.
To turn on and off the cook relay.
in high operation, the signals holds “H” level during microwave cooking and “L” level while not cooking. In other
cooking modes (MED. HIGH, MED., MED. LOW, LOW) the signal turns to “H” level and “L” level in repetition
according to the power level.
(RD933Al U)
PIN NO.
I 35
1 SIGNAL 1 D2
1 i/O 1 OUT
Terminal not used.
PIN NO.
1 36
1 SIGNAL 1 D3
1 l/O 1 OUT
Oven lamp, turntable motor and coolina fan motor driving sional. (Square Waveform: 45Hz)
To turn on and off the control relay.
The pulse signal (45Hz) is delivered to the control relay driving circuit and cook relay control circuit.
PIN NO.
I 37
1 SIGNAL 1 D4
1 I/O 1 OUT
Segment data signal. Signal similar to Dll .
(RD939A2U)
PIN NO. 1 38-42 1 SIGNAL 1 D5-D9
1 I/O 1 OUT
Digit selection signal. Signal similar to DIO.
(RD938A2U)
20
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1.
Precautions for Handing Electronic
Components
This unit uses CMOS LSI in the integral part of the
circuits. When handing 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 charged 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 aluminum foil.
Also wrap 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.
. .
J
epprox. 1MR
Ift?Y
7h
2. Shapes of Electronic Components
Transistor
DTAI 14ES
DTAI 43 ES
DTC143ES
DTDl43ES
3. Servicing of Touch Control Panel
We describe the procedures to permit servicing the
touch control panel of the microwave oven and the
cautions you must consider when doing so.
To carry the servicing, power supply to the touch
control panel is available either from the power line
of the oven proper itself of from an external power
SERVDCING
source.
(I) Servicing the touch control panel with
power supply from the oven proper:
CAUTION:
THE HIGH VOLTAGE TRANSFORMER OF
THE MICROWAVE OVEN IS STILL ALIVE
TO GIVE YOU DANGER DURING SER-
VICING.
Therefore, when checking the performance of
the touch control panel,put the outer cabinet
on the oven proper to keep from touching the
high voltage transformer, or unplug the primary
terminal (connector) of the high voltage trans-
former to turn it off; and the end of such con-
nector shall 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 be-
tween the touch control panel and the oven
proper is so short that they can’t be separated
from each other.
For those models, therefore, check and repair
all the controls (with the sensor-related ones
included) of the touch control panel while
keeping it in contact with the oven proper.
B On some models, on the other hand, the power
supply cord between the touch control panel
and the oven proper is so long that they may
be separated from each other. For those mod-
els, therefore, it is allowed 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 stop
switch (on PWB) of the touch control panel
with a jumper, which brings about an opera-
tional state that is equivalent to that with the
oven door being closed.
As to the sensor-related controls of the touch
control panel, their checking is allowed if the
dummy resistor(s) whose resistance is equal to
that of those controls is 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 stop switch (on PWB) of the touch control
panei,which brings about an operational state
that is equivalent with the oven door being
closed. And connect an external power source
to the power input terminal of the touch control
panel, and then it is allowed to check and repair
the controls of the touch control panel;as in the
case of (1) - B above,
it is here also possible to
check the sensor-related controls of the touch
control panel by using the dummy resistor(s).
4. Servicing Tools
Tools required when servicing the touch control
panel assembly.
1) Soldering iron: 30W (To prevent leaking cur-
rent, it is recommended to use a soldering iron with
a grounding terminal.)
2) Oscilloscope:
Single beam, frequency range:
DC - 1 OMHz type or more ad-
vanced model.
3) Others:
Hand tools
5. Other Precautions
1) Before turning on the power source of the
control unit, remove the aluminum foil applied
for preventing static electricity.
2) Connect the connectors of the indicator and
key units to the control unit taking care that the
lead wires are not twisted.
3) After aluminum foil is removed, take extra care
that abnormal voltage due to static electricity
etc. is not applied to the input or output termi-
nals.
4) Attach connectors, electrolytic capacitors, etc.
to PWB, taking care that ail connections are
tight.
5) Be sure to use specified components where
high precision is required.
21
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COMPONENT REPLACEMENT AND ADJUSTMiENT PROCEDURE
Avoid possible exposure to microwave energy. Please follow the
before operating the oven.
1. CARRY OUT 3D CHECKS.
2. Make sure that a definite “click” can be heard when
the microwave oven door is unlatched. (Hold the
door in a closed position with one hand, then push
the door open button with the other, this causes the
latch heads to rise., it is then possible to hear a
“click” as the door switches operate.)
3. Visually check the door and cavity face plate for
damage (dents, cracks, signs of arcing etc.).
2. Door hinge, support or latch hook is damaged.
3. The door gasket or seal is damaged.
4. The door is bent or warped.
5. There are defective parts in the door interlock sys-
tem.
6. There are defective parts in the microwave generat-
ing and transmission assembly.
7. There is visible damage to the oven.
Carry’ out any remedial work that is necessary before
Do not operate the oven:
operating the oven.
-.
1. Without the RF gasket (Magnetron).
Do not operate the oven if any of the following con-
2. If the wave guide or oven cavity are not intact.
ditions exist;
3. if the door is not closed.
1. Door does not close firmly.
4. if the outer case (cabinet) is not fitted.
Please refer to ‘OVEN PARTS, CABINET PARTS, DOOR PARTS’, when carrying out any of the following removal
procedures:
I
(RDAOOOl E)
OUTER CASE REMOVAL
To remove the outer case, proceed as follows.
6. Discharge the H.V. capacitor before carring out any
1. Disconnect oven from power supply.
further work.
2. Open the oven door and wedge it open.
7. Do not operate the oven with the outer case re-
3. Remove the screws from rear and along the side
moved.
edge of case.
N.B.; Step I,2 and 6 form the basis of the 3D checks.
4. Slide the entire case .back about 1 inch (3cm) to
CAUTION: DISCHARGE
HIGH VOLTAGE
free it from retaining clips on the cavity face plate.
CAPACITOR BEFORE TOUCHING ANY
5. Lift the entire case from the oven.
OVEN COMPONENTS OR WIRING.
HIGH VOLTAGE COMPONENTS REMOVAL
(HIGH VOLTAGE CAPACITOR AND HIGH VOLTAGE RECTIFIER ASSEMBLY)
1. CARRY OUT 30 CHECKS.
2. Disconnect the H.V. wire A with the filament lead
of the power transformer from the high voltage
capacitor.
3. Disconnect the H.V. wire of the H.V. rectifier as-
sembly from the power transformer.
4. Remove the single(l) screw holding the capacitor
holder to the back plate of the oven cavity.
5. Remove the single(l) screw holding the earth side
terminal of the high voltage rectifier assembly to the
capacitor holder.
6. Disconnect the H.V. rectifier assembly from the high
voltage capacitor.
7. Now, high voltage capacitor and H.V. rectifier are
free.
CAUT!ON: WHEN REPLACING HIGH VOLTAGE
RECTIFIER ASSEMBLY, ENSURE THAT
THE CATHODE (EARTH) CONNECTION
IS
SECURELY FIXED TO
THE
CAPACITOR
HOLDER
WITH AN
EARTHING SCREW.
POWER TRANSFORMER REMOVAL
1. CARRY OUT 30 CHECKS
2. Disconnect the main harness from the power trans-
former
3. Disconnect the H.V. wire of the H.V. rectifier as-
sembly from the power transformer.
4. Disconnect the filament lead of the power transfor-
mer from the H.V. wire A.
5. Disconnect the filament lead of the power transfor-
mer from the magnetron.
6. Remove the four(4) screws holding the power
transformer to the bottom plate.
7. Remove the trans cushion from the power transfor-
mer.
8. Remove the power transformer from the bottom
plate. Now, it is free.
22
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MAGNETRON REMOVAL
1. CARRY OUT3JCHECKS
5. Remove the magnetron from the waveguide with
2. Disconnect leads from magnetron.
3. Remove the two(2) screws holding air guide to the
magnetron and oven cavity. And remove the air
guide.
4. Carefully remove four(4) screws holding magnetron
to waveguide, when removing the screws hold the
magnetron to prevent it from falling.
care so the magnetron antenna is not hit by any
metal object around the antenna
CAUTION: WHEN REPLACING THE MAGNETRON,
BE SURE THE R.F. GASKET IS IN
PLACE AND THE MAGNETRON
MOUNTING SCREWS ARE TIGHTENED
SECURELY.
CONTROL PANEL REPLACEMENT
Removal
1. CARRY OUT 3D CHECKS.
2. Disconnect the leads from the control panel.
3. Remove the single screw holding the control panel
Installation
1. Put the tabs of the control panel into the holes of
to the oven cavity.
4. Lift up the control panel assembly.
5. Release the control panel from the oven cavity.
6. Now, the control panel assembly is free.
the oven cavity.
2. Push down the control panel.
3. Hold the control panel to the oven cavity with the
single( 1) screw.
4. Connect the leads to the control panel.
OVEN LAMP SOCKET REMOVAL
Own lamp scxkot
1. CARRY OUT 3D CHECKS.
2. Bend the tab of the lamp angle.
3. Lift up the oven lamp socket.
4. Pull the wire leads from the oven lamp socket by
pushing the terminal hole of the oven lamp socket
with the flat type small screw driver.
5. Now, the oven lamp socket is free.
CAUTION: When replacing the oven lamp socket, re-
place it so that the side where the black
dot is put faces upward.
Figure C-l. Oven Lamp Socket
POSITIVE LOCK@tONNECTOR REMOVAL
Terminal
1. Push the lever of positive IockQconnector.
2. Pull down the connector from the terminal.
3. Now, the connector is free.
Note: If the positive locka has a insulation sleeve, first
remove it.
If you do not so, you can not push
the lever of positive locka
CAUTION: THE POSITIVE LOCK @ TERMINAL
CAN NOT BE DISCONNECTED BY
ONLY PULLING.
BECAUSE ONCE
YOU (SERVICE PERSONAL) HAVE
CONNECTED THE POSITIVE LOCK @I
CONNECTOR TO THE TERMINAL,
THE POSITIVE LOCK a CONNECTOR
HAS BEEN LOCKED.
(R DA6001 E)
Positive lock’
Figure C-2. How to release the Positive lock R
connector
23
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FAN MOTOR REPLACEMENT
REMOVAL
1. CARRY OUT 3D CHECKS.
2. Disconnect the wire leads from the fan motor.
3. Remove the two(2) screws (rear side) and the
single(l) screw (top side) holding the fan duct as-
sem bly.
4. Remove the fan blade assembly from the fan motor
shaft according the following procedure.
1)
2.
3.
Hold the edge of the rotor of the fan motor by
using a pair of grove joint pliers as shown Fig-
ure C-l (a)
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 easy to be 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 transform the bracket by
touching with the pliers.
Remove the fan blade from the shaft of the fan
motor by pulling and rotating the fan blade with
your hand.
Now, the fan blade will be free.
CAUTION:
l Do not use this removed fan blade
again. Because the hole(for shaft) of
it may become bigger than a standard
one.
Axis
These are the position
where should be
pinched with pliers.
Figure C-3(b) Side view
INSTALLATION
1. Install the fan motor to the fan duct assembly with
the two(2) screws.
2. Install the fan blade assembly to the fan motor shaft
according the following procedure.
1)
2)
3)
Hold-the center of-the bracket which supports
the shaft of the fan motor on the flat table as
shown in Figure C-4.
Apply the screw lock tight into the hole(for
shaft) of the fan blade.
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:
l Do not hit the fan blade strongly when
installed because the bracket may be
transformed.
l Make sure that the fan blade rotates
smooth after installed.
l Make sure that the axis of the shaft is
not slanted.
5. Remove the two(2) screws holding the fan motor
to the fan duct assembly.
6. Now, the fan motor is free.
3. Install the fan duct assembly to the oven cavity with
the two(2) screws (rear side) and single(l) screw
(top side).
4. Connect the wire leads to the fan motor, referring
to the pictorial diagram.
Table
\
Center of
bracket
Figure C-3(a) Rear view
Figure C-4.
24
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R-3A54
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4.
5.
6.
7.
8.
Shut the door (close the contacts of latch
switches).
Make sure upper and lower oven hinges are inserted
into the upper and lower door hinge pins.
Make sure the door is parallel with oven face lines
(left and upper side lines) and door latch heads
pass through latch holes correctly.
Secure three (3) screws holding the lower oven
hinge and the base plate (Left) to the bottom side
of oven cavity.
Secure two (2) screws holding the upper oven
hinge to the top of the oven cavity.
Note:After any service to the door;
(A) Make sure that all switches are operat-
ing properly.
(Refer to chapter
“Switches Adjustment”.)
(B) An approved microwave survey meter
should be used to assure compliance
with proper microwave radiation emis-
sion limitation standards. (Refer to
Microwave Measurement Procedures.)
DOOR ADJUSTMENT
The door can be adjusted by keeping screws of each
hinge loose.
After adjustment, make sure of the following :
1.
2.
3.
4.
Door -latch heads smoothly catch latch hook
through latch holes and that latch head goes
through center of latch hole.
Deviation of door alignment from horizontal line of
cavity face plate is to be less than 1 .Omm.
Door is positioned with its face pressed toward
cavity face plate.
Re-install outer case and check for microwave
leakage around door with an approved microwave
survey meter. (Refer to Microwave Measurement
Procedure.)
Note:The door on a microwave oven is designed
to act as an electronic seal preventing the
leakage of microwave energy from oven
cavity during cook cycle.
This function
does not require that door be air-tight,
moisture (condensation)-tight
or
light-tight.
Therefore, occasional
apperance of moisture, light or sensing of
gentle warm air movement around oven
door is not abnormal and do not of them-
selves, indicate a leakage of microwave
energy from oven cavity.
Figure C-IO. Door Replacement and adjustment
DOOR DISASSEMBLY
Remove door assembly, refer to “Door Replacement”.
Replacement of door components are as follows:
I. Place door assembly on a soft cloth with latches
facing up.
Note:As the engaging part of choke cover and
door panel are -provided at 18 places, do
not force any particular part.
2.
3.
4.
5.
6.
Insert an putty knife (thickness of about 0.5mm)
into the gap between the choke cover and corner
portion of door panel as shown Figure C-l 1 to free
engaging parts.
Lift up choke cover.
Now choke cover is free from door panel.
Remove four (4) screws holding the door frame to
the gutter for choke cover.
Remove the door frame with pulling the upper door
hinge pin.
7.
Release the latch spring from the door panel.
Figure C-l 1. Door Disassembly’
8. Remove the latch head from the door panel.
9. Now the door panel is free.
27
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MICROWAVE MEASUREMENT
After adjustment of door latch switches, monitor
switch and door are completed individually or collec-
tively, the following leakage test must be performed
with a survey instrument and it must be confirmed that
the result meets the requirements of the performance
standard for microwave oven.
REQUIREMENT
The safety switch must prevent microwave radiation
emission in excess of 5mW/cm2 at any point 5cm or
more from external surface of the oven.
PREPARATION FOR TESTING:
Before beginning the actual test for leakage, proceed
as follows;
1. Make sure that the test instrument is operating
normally as specified in its instruction booklet.
Important:
Survey instruments that comply with the require-
ment for instrumentations as prescribed by the per-
formance standard for microwave ovens must be
used for testing.
Recommended instruments are:
NARDA 8100
NARDA 8200
HOLADAY HI 1500
SIMPSON 380M
2. Place the oven tray into the oven cavity.
3. Place the load of 275&l 5ml of water initially at
20f 5°C in the centre of the oven tray. The water
container should be a low form of 600 ml beaker
with inside diameter of approx. 8.5cm and made of
an electrically non-conductive material such as
glass or plastic.
The placing of this standard load in the oven is im-
portant not only to protect the oven, but also to in-
sure that any leakage is measured accurately.
4. Close the door and turn the oven ON with the timer
set for several minutes. If the water begins to boil
before the survey is completed, replace it with
275ml of cool water.
5. Move the probe slowly (not faster that 2.5cm/sec.)
along the gap.
6. The microwave radiation emission should be meas-
ured at any point of 5cm or more from the external
surface of the oven.
(RDBllOSU)
Microwave leakage measurement at 5 cm distance
28
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Figure O-l. Oven Schematic-OFF Condition
SCEMATIC
NOTE: CONDITION OF OVEN
I
1. DOOR CLOSED.
2. COOKING TIME PROGRAMMED.
3. START KEY TOUCHED.
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29
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R-3A54
R-3E54
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R-3E54
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R -3A54
R-3E54
1
A
B
C
D
E
F
G
H
1
2
3
4
5
6
Figure S-3. Printed Wiring Board
I
1
2
3
4
5
6
,
32
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R-3A54
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PARTS LIST
Note :
The voltage supplied to the parts “*O are greater than 250V.
REF. NO. 1 PART NO.
I
DESCRIPTION
1 CYTY ICODE
-
*
*
-*
*
ELECTRICAL PARTS
l- 1
QFS-CAOlOWREO Fuse M8A
1 AE
l- 2
QFSHDA002WREO Fuse holder
1 AE
l- 3
QSW-MA009WREO Monitor switch (V-5220D-070)
AF
l- 4
QSW-MA051WREO 1st. 2nd.
latch and stop switches (V-5230D-600)
; AF
l- 5
RTHM-A075WREO Thermal cut-out 145°C
2
AQ
l- 6
QACCAAOllWREO Power supply cord
1
AQ
l- 7
FW-QZA070WRKO H.V.
rectifier assembly
1 AY
l- 8
RC-QZA148WREO H.V. capacitor
1
AX
l- 9
RMOTEA258WREO Fan motor
1
BB
l-10
RV-MZA162WREO Magnetron
m
1
BL
l-11
QSOCLAOllWREO Oven lamp socket
1
AH
l-12
RLMPTA029WREO Oven lamp
1 AK
l-13
RMOTDA169WREO Turntable motor
1
AW
l-14
RTRN-A347WREO Power transformer
1
BR
l-15
RR-WZA003WREO Monitor resistor 0.8f2/2OW
1 AG
CABIN ET PARTS
FFTASA035WRKO Oven lamp access cover assembly
PCUSGA306WRPO Cushion
PSLDPA005WRPO Lamp reflector
GCABUA373WRPO Outer case cabinet
1 AN
1 AA
I I I
1 AD
1
BG
CONTROL PANEL PARTS
3- 1
CPWBFA493WRKO Control unit(Not Replacement Item)
3- 1A
QCNCMA230DREO 4-pin connector (A)
;r ;;
QCNCMA275DREO 2-pin connector (B)
QCNCWA030DREO 12-pin connector (G)
3- 1D RV-KXA037DREO Fluorescent display tube
Cl
RC-KZA087DREO Capacitor
O.lpF 50V
c2 VCEAB31VW477M Capacitor
470j~F 35V
c3
VCEAB31HW335M Capacitor 3.3pF 50V
c4 VCEAB31CW476M Capacitor
47pF 16V
c5
VCEAB31CWlOGM Capacitor
1OpF 16V
C6,7,11,VCKYDllCY103N Capacitor
O.OlpF 16V
c40
c10,12 VCTYF31HF103Z Capacitor
O.OlpF 50V
Cl3 VCEAB31VWlOGM Capacitor 10pF 35V
c30 VCEAB31HW104M Capacitor O.li,lF 50V
c31 VCEAB31VW475M Capacitor 4.7/.1F 35V
C80
RMPTEA009DREO Capacitor array B5RC0122-33N (330pFx4)
CFlOO RCRS-A012DREO Ceramic resonator (CST4.00MGW)
Dl-4 VHDllESl///-1 Diode (11ESl)
D20,31, VHDlSS270A/-1Diode (lSS270A)
--
1 BP
1 AC
1
AB
1
AE
1 AU
1
AB
1 AC
1 AA
1 AA
1
AA
4 AH
2 AB
1 AB
1 AM
1 AA
1 AE
AD
4' AB
13 AA
D32,40,
D41,60-
D67
ICl
RH-IZA415DREO LSI
81
VSDTC143ES/-3 Transistor (DTC143ES)
8%
VSDTA143ES/-3 Transistor (DTA143ES)
VSDTA114ES/-3 Transistor (DTA114ES)
Q31,32
VSDTD143ES/-3 Transistor (DTD143ES)
Rl
VRD-B12HF432JResistor
R2
4.3kn 1,'2W
VRD-B12HF102J Resistor lkn 1/2W
R3
VRD-B12HF122J Resistor
R4,31
1.2kn 1/2W
VRD-B12EF471J Resistor
47of2 1/4w
R5,10,30VRD-B12EF153JResistor
R12
15kf2 1/4W
VRD-B12EF133J Resistor
13kn 1/4W
R20
VRD-B12EF102J Resistor
lkS2 1/4W
R21,
VRD-B12EF332JResistor 3.3kn 1/4W
R60-71
AS
: AB
1
AB
1 AB
2 AC
1 AH
1
AA
1 AA
2
AA
3 AA
1 AA
1 AA
13 AA
33
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R-3A54
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Note : The voltage supplied to the parts s*” are greater than 250V.
1 REF. NO. PART NO. DESCRIPTION
Q’TY
CODE
R40
VRD-B12EFlOlJ Resistor 1000 1/4w
AA
R41
VRD-B12EF512J Resistor 5.lkn 1/4W
R80
RR-DZA089DREO Resistor array (RGLD4X104J)
1 AA
1
AB
RlOO
VRD-B12EF105J Resistor
1Mn 1/4W
1
AA
RYl
RRLY-A080DREO Relay (OJ-SH-124LM)
1
AG
RRLY-A079DREO Relay (OMI-SH-124LM)
1
AH
RALM-A014DREO Buzzer (PKM22EPT-CA)
AG
RTRNPA064DREO Transformer
1 AS
RH-VZAOlODREO Varistor (TNR15G471K)
1
AE
VHEHZGA3///-1 Zener diode (HZ6A3)
1 AA
RY2
SP20
Tl
VRSl
ZDl
ZD2
ZD3
3- 2
VHEHZ5C2///-1 Zener diode (HZ5C-2)
VHEHZ5A2///-1 Zener diode (HZ5A-2)
FPNLCA931WRKO Control panel frame with key unit (R-3A54)
FPNLCA930WRKO Control panel frame with key unit (R-3E54)
JBTN-A763WRFO Open button
MSPRCA050WREO Open button spring
XEPSD30PlOXSO Screw; Control unit mts.
4- 1
PHOK-A065WRFO Latch hook
4- 2
LBNDKA087WRPO Capacitor holder
4- 3
PFILWA041WREO Lamp filter
4- 4 PPACGA084WRFO Turntable packing
4- 5
PCUSUA292WRPO Cushion
4- 6
;I ;
:11;
PDUC-A459WRWO Air guide
FOVN-A252WRTO Oven cavity
FDAI-A154WRYO Bottom plate (Right) assembly
GDAI-A208WRWO Bottom plate (Left)
GLEGPA035WREO Foot
4-11
4-12
4-13
4-14
4-15
4-17
4-18
4-19
4-20
4-21
LSUB-A066WRPO Magnetron angle
MHNG-A290WRTO Lower oven hinge
MHNG-A270WRTO Upper oven hinge
MLEVPA194WRFO Switch lever
NCPL-A039WRFO Coupling
PCOVPA245WRTO Motor cover
PCOVPA271WREO Waveguide cover
PCUSUA166WRPO Cushion
PCUSUA329WRPO Cushion
PPACGA073WREO Rubber cushion B
4-22
4-22-l
4-23
4-24
4-25
4-26
4-27
4-28
4-29
4-30
FFANJA018WRKO Fan blade assembly
MSPRP0038YBEO Fan retainer clip
FDUC-A235WRTO Fan duct assembly
LANGFA154WRPO L support angle
LANGQA327WRPO Lamp angle
LSTPPA069WRFO Cord anchorage (Upper)
LSTPPA070WRFO Cord anchorage (Lower)
PCUSGA312WRPO Cushion
PCUSGA345WRPO Cushion
PCUSGA351WRPO Cushion
4-31
PCUSGA353WRPO Cushion
4-32 PCUSUA173WRPO Cushion
OVEN PARTS
DOOR PARTS
1
1
1
1
1
1
1
1
4'
1
t
1
1
1
t
1
1
1
1
1
1
1
1
1
1
:
1
1
AL
AM
AA
AB
AF
AM
BN
AY
AP
AF
AL
AM
AM
AK
AM
AP
AS
AG
AH
AD
AE
AB
AU
AK
AN
AD
AC
AB
AK
AG
AH
AC
DDORFA544WRKO
FDORFA224WRTO
GCOVHA268WRFO
GWAKPA224WRRO
HPNL-A398WRRO
LSTPPA107WRFO Latch head
MSPRTA081WREO Latch spring
PSHEPA382WREO Sealer film
XUPSD30P04000 Sscrew; 3mm x 4mm
Door assembly complete. (Not Replacement Item)
Door panel
Choke cover
Door frame
Door screen
1
i
1
BP
BG
AQ
AW
BA
AK
AA
AH
AB
34
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Note :
The voltage supplied to the parts r’*r are greater than 250V.
REF. NO. 1 PART NO.
DESCRIPTION
107~ ICODE
MISCELLANEOUS
6- 1 FROLPA059WRKO Roller Stay
6- 2 NTNT-A046WRFO Turntable tray
t AS
AW
6- 3 TINS-A307WRRO Operation manual (R-3A54) 1 AN
TINS-A305WRRO Operation manual (R-3E54)
1 AN
6- 4 TCADCA422WRRO Cookbook 1 AS
6- 5 FW-VZB121WREO Main wire harness ; AZ
6- 6 FW-VZB122WREO Switch harness AP
6- 7 TCAUHAOSSWRRO Caution label
6- 8 PZET-A013WREO Terminal insulator
; AF
AC
6- 9 QW-QZA169WREO High voltage wire A 1 AM
6-10 TSPCNB652WRRO Name plate (R-3E54) 1 AH
TSPCNB653WRRO Name plate (R-3A54)
AH
6-11
QTANP0020YBEO Connector CE-230
; AA
6-12 PTUBUA003WREO Tube 1 AG
SCREWS AND WASHERS
7- 1
XHTSD40P08RVO Screw; 4mm x 8mm
AA
7- 2 LX-CZA038WREO Special screw : AA
;I ;
LX-CZ0052WREO Special screw
2 AA
XFPSD30PlOOOO Screw; 3mm x 1Omm
AA
7- 5
XFPSD40P08KOO Screw; 4mm x 8mm
3' AA
;I ;
XFPSD40P08000 Screw; 4mm x 8mm
5
AA
XHPSD30PlOXSO Screw; 3mm x 1Omm
1 AA
7- 8 XHTSD40R12RVO Screw (LHSTIX LR-4) 3 AA
;110"
XOTSD40P12RVO Screw; 4mm x 12mm
8 AA
XOTSD40P12000 Screw; 41nm x 12mm
9 AA
7-11 XBBWW30P06000 Screw; 3mm x 6mm
2 AA
7-12 XHSSE40P08000 Screw; 4mm x 8mm
1 AA
7-13
XBTUW40P08000 Screw; 4mm x 8mm
2 AA
7-14 XFPSD30P06000 Screw; 3mm x 6mm
5 AA
7-15 XFPSD40P06000 Screw; 4mm x 6mm 2
7-16 XFTSD40P30000 Screw; 4mm x 30mm 1
7-17 LX-NZ0024YBEO Nut 2 AA
HOW TO ORDER REPLACEMENT PARTS
To have your order filled promptly and correctly, please furnish the following information.
1. MODEL NUMBER
2. REF. NO.
3. PART NO.
4. DESCRIPTION
(RDPI 303U)
35
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1 2 3 4 5 6
----I
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6
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4.7
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.A
L
E
7.13
x2
4.18
ff!ff 4.9
4 10
x2
b
1
2
3
4 5
6
36
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R-3A54
R-3E54
All manuals and user guides at all-guides.com
R -3A54
R-3E54
1
2
3
4
5
6
MISCELLANEOUS
l Actual wire harness may be different than illustration.
PACKING AND ACCESSORIES’
l PACKING PAD KIT
MICROWAVE OVEN
EKING CASE
(SPAKCB694WREO: R-3E54)
(SPAKCB896WREO: R-3A54)
a
TuRNlAsu
TRAY
a
‘i
‘\.--’
&
m
o?EMTloN
MANUAL
ROLLER STAY
INTOTHE
l Not Replaceable Items.
I
1
2
3
4
5
6
A
B
C
D
E
F
G
IH
4
‘92 SHARP CORP. (4K0.93E) Printed in Australia
38
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