SHARF’ SERVICE MANUAL
S8206R4A54PJZ
MICROWAVE OVEN
Photo R-4A54
R-4A54B
In interests of user-safety the oven should be restored to its original
condition and only manufacturer original spare parts must be used.
(RD16701U)
This is a supplemental Service Manual for Modei R-4A54 etc.
Those models are quite similar to Base Model R-4A53 (Refer No. is S7106R3A53PJZ).
Use this supplemental manual together with the Base Model Service Manual.
Refer to the Base Model Service Manual for complete operation, service information, etc.
CRD17101lJ1
TABLE OF CONTENTS
GENERAL IMPORTANT INFORMATION
Page
......................................................................................................
1
CAUTION, MICROWAVE RADlATlON,WARNING
......................................................................................
1
PRODUCT SPECIFICATIONS
......................................................................................................................... 2
APPEARANCE VIEW
........................................................................................................................................ 3
SERVICING ........................................................................................................................................................
4
TEST PROCEDURE
...........................................................................................................................................
5
TOUCH CONTROL ASSEMBLY
COMPONENT
.....................................................................................................................
8
REPLACEMENT AND ADJUSTMENT PROCEDURE .....................................................
WIRING DIAGRAM
13
.......................................................................................................................................
PICTORIAL DIAGRAM
15
..................................................................................................................................
CONTROL PANEL CIRCUIT
17
.........................................................................................................................
PRINTED WIRING DIAGRAM
19
PARTS LIST
..................................................................................................................... 20
....................................................................................................................................................
21
SHARP CORPORATION
R -4A54
R-4A54B
R -4A54
R -4A54B
SERVICE MANUAL
SHARP
MICROWAVE OVEN
R-4A54/ R-4A54B
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 and base model manual, so they will
be qualified to render satisfactory customer service.
fRD36106U)
CAUTION
MICROWAVE RADIATION
-
Service engineers should not be exposed to the microwave 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, fianges 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 energized.
-
(RD36203U)
WARNING
I
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.
I
(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.
I
Servicing and repair work must be carried out only by
’
trained service engineers.
All the parts marked “*‘I
more than 250V.
on parts list are used at voltages
(RD51110u)
SHARP CORPORATION
OSAKA, JAPAN
\\ t ‘.a~ *\T ” ..*mh
“*a* .” ‘-*e ~~~~~~~“~~~~~~~~~~ ; tp :, s % \
.\\ \
c
e&> a$*:.
: . ,>$b!\
;” I. >,
‘%,vltyeg_, ,- “X, “” I #.+>l ,:&~L~^‘~,iig,,
~Wd&tahX wk$%$:*~-~,“*> $- mi y‘;‘ ‘*4+, k”-” I $
*“:*.” i 9
‘,*“-
+
; a.22 :=:
: I” “““AZ *‘,gz 2. +$&g
* 1
a,_ *
$4 “-3% a.b&lv&-,,?$q ,q’*y
a”
:> &a \Q 2:
x p * :r j
p*sT A* I_* b- *7&2~r *?a aad L >“, &< 1 /LI
b **> __ _c
-;c a+,?,~~~~ a <q
,,,‘- b. ,:,y %x$< (‘.
“h-d $: i
-SW $.Pi% I *. %,
\ -
a?<>- ;$p a.+*
,.L
-b&--.:& & ,<< -b&--.:& & ,<<
%gd&:k* %gd&:k*
* * y - y -
.“i:
.“i:
PRODUCT SPECIFICATIONS
PRODUCT SPECIFICATIONS
.%
A”‘$,”
. .%
A”‘$,”
.
*avow *avow
^ c a*, + **s, @,< ” I ,“.;-
‘ +-
--.**$a- 1 --.**$a- 1
@A *y&-a @A *y&-a
’ SERVICING
4
>W,r%=y >W,r%=y
’ SERVICING
4
-w”, * ” -w”, * ”
t&&e* w ‘a* t&&e* w ‘a*
~ 5 ~ 5
*; i :s * * _ ^ c., ->* b * > *; i :s * * _ ^ c., ->* b * >
I* I*
\ \
‘9 ‘9
)‘\ + )‘\ +
‘ j.” ‘ j.”
* Qb\\c ,‘a, * Qb\\c ,‘a,
r r
Ed P ,,1 Ed P ,,1
-‘r r- “, -‘r r- “,
i es “-e+-I.i i es “-e+-I.i
I \__- dh I \__- dh ‘-& \ ‘C’,‘,\ ‘-& \ ‘C’,‘,\
I 1* & I 1* &
“’ “, “’ “,
j j
‘G%+ <“)s&\ ‘G%+ <“)s&\
_‘* _ .’ _‘* _ .’
;e * fi *
“, “,
“* 3 b “* 3 b t t
‘2: ” ‘2: ”
j
j
v*L~*‘rl . Y ‘ * v*L~*‘rl . Y ‘ *
TOUCH CONTROL PANEL
TOUCH CONTROL PANEL
:” $$ $&“J& :” $$ $&“J& ‘3 ‘3
%< - j
. ASSEMBLY
2 ;
ASSEMBLY
f f
~‘*J d
:s: * _ &q %;
- I> .
n-e*” ,“” 9, I * y&q++& :” ‘y\” - ^ c F
”
i
*
\
A$
I ~ \t ,A : .b _ ‘ \ \j ‘ .
” ‘. :.&”
I ^ ’ * .vp *
.*-a
*- > _
v”,, &+ *t;.z * I
b L,\.&,- *-s
*
I^ 1 ^,“& ,a;:,
*< 1
,x2 -+ h,?
* *.“.< A/
** ‘?k+ : COMPONENT REPLACEMENT
k
“, ‘,
-<
~‘*J d
:s: * _ &q %;
- I> .
n-e*” ,“” 9, I * y&q++& :” ‘y\” - ^ c F
”
*
\
A$
I ~ \t i ,A : .b _ ‘ \ \j ‘ .
” ‘. :.&”
I ^ ’ * .vp *
.*-a
*- > _
v”,, &+ *t;.z * I
b L,\.&,- *-s
*
I^ 1 ^,“& ,a;:,
*< 1
,x2 -+ h,?
* *.“.< A/
** ‘?k+ : COMPONENT REPLACEMENT
k
“, ‘,
” f r-: \
_ n-et \ AND ADJUSTMENT PROCEDURE : q 2
. *
\
<<
f L
” rT.*” “, *_
b ,
i
~ ‘” ,
WIRING DIAGRAM
* <_ j. \>”
. *
0s _
1 h \
b*
j
* .‘- -hp,y
_* a -
PARTS L,ST
(RD37201 U)
R -4A54
R -4A548
PRODUCT SPECIFICATIONS
SPECIFICATION
ITEM
Power Requirements
Power Consumption
Power Output
Outside Dimensions
Cooking Cavity Dimensions
Turntable diameter
Control Complement
I
DESCRIPTION
/ 240 Volts(Australia)/230-240 Volts(New Zealand)
/ 50 Hertz
I Single phase, 3 wire earthed
/ 1400w
1 750 watts nominal of RF microwave energy (AS 2895 1986)
’ 9OOW watts nominal of RF microwave energy (IEC-705-I 988)
Operating frequency of 2450M Hz
1 Width 550mm
Height 312mm
/ Depth 420mm
/ Width 381 mm
1 Height 211 mm
1 Depth 41 I mm
/ 360mm
I
j Touch Control System
i Ciock( I:00 - 12:59 )
1 Timer (0 - 99 minutes 99 seconds )
i Microwave Power for Variable Cooking
Set Weight
/
Repetition Rate;
HIGH
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Full power throughout the cooking time
MEDIUM
HIGH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
approx. 70% of Full Power
I
MEDIUM
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
approx. 50% of Full
Power
I
MEDIUM LOW
. ..*.................................... approx. 30% of Full Power
!
LOW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
approx. 10% of Full
Power
1 INSTANT ACTION
j SERVE QUANTITY pads
/ NUMBER pads
I EASY DEFROST
i AUTO START /CLOCK
INSTANT COOK/START
/ STOP CLEAR
j POWER LEVEL
j AUTO COOK
j MEMORY
! Approx. 17.0 kg
NOTE:
Numbers and letters shown after sentences such as “RD44101 U” are for factory use only.
2
R -4A54
R-4A540
APPEARANCE VIEW
1. Ventilation
openings
2. Oven lamp
3. Hinges
4. Safety door latches
5. See through door
6. Coupling
7. Door open button
TOUCH CONTROL PANEL
.-a--- _.- _ --.-_. _ _ _-
/‘wrA ,VT A&riO,Y
8. Touch Control Panel
9. Digital readout
10. Waveguide cover
11. Access cover for oven lamp replacement
12. Power supply cord
INSJANJ ACllUN PADS
Press once to cook or reheat 8
popular menu.
Frozen Dinner
AUTO
Press to select Auto Cook
mode.
AUTO COOK MENUS-
NUMBER PADS
Press to enter cooking times,
clock time, weight or quantity
of food, or to select the Auto
Cook menus.
POWER LEVEL PAD
Press to select microwave
power setting.
If not pressed, HIGH is auto-
matically selected.
STOP/CLEAR PAD
Press to erase during
programming.
Press once to stop operation
of oven during cooking; press
twice to cancel cooking pro-
gramme.
1 serve 1 1
G-?
Bacon
1 serve ~
-
I
Rice 8 Pasta
‘12 cup
Reheal Bevecage/Soup
1 cup
Chicken Pieces
1 serve
Casseroles
1 serve
.
I
d
1 Fresh vegetables
2 Frozen vegetabtes
3 Jackel poloto
4 Roasl lamb
5 Seasoned roast
-2 SERVE Q(uARTIT-Y PAD
To cook two serves, press this
pad prior to pressing the INSTANT ACTION pad.
-3 SERVE QUANTITY PAD
Tocookthreeserves. press this
pad prior to pressing the INSTANT ACTION pad.
-4 SERVE QUANTITY PAD
To cook four serves, press this
pad prior to pressing the INSTANT ACTION pad.
-EASY DEFROST PAD
Press to defrost meat by entering weight.
*MORE (A). LESS (v’) PADS
Press to increase/decrease the
time in one minute increments
during cooking or to alter the
doneness for the Auto Cook,
Instant Action or Easy Defrost
modes.
,INSTANT COOK/START PAD
Press once to cook for 1 minute
at HIGH or increase by 1 minute
multiples each time $his pad is
pressed during cooking.
Press to start oven after setting
programmes.
3
R-4A!i4
R-4AMB
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
:
3
Disconnect the supply.
Door opened, and wedged open.
Discharge high voltage capacitor.
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 connecting lead of the high-voltage rectifier)
against the chassis with the use of an insulated screwdriver.
Sharp recommend that wherever possible
fault-finding is carried out with the supply disconnected. It may in, some cases, be necessary to
connect the supply after the outer case has been
removed, in this event carry out 3D 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 4R
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 3D checks and re-examine the connections 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.
(RD81001 H)
4
R -4A54
R-4A54B
TEST PROCEDURES
PROCEDURE
LETTER COMPONENT TEST
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 ou?er 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 cf 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
Water load
. . . ...2000 ml Initial temperature
Power supply Voltage . . . . . . . . . . . . . Rated voltage
. . . . . . . 23+ 1 “C
Heating time . . . . . . 1 min. 51 sec.
P = 75 x AT
Measuring method:
A) Use two 1 litre Pyrex beakers with a diameter of approximately of 12cms.
B) Place 1 litre of 23°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 I minute and 51 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 1 minute and 51 seconds stop the oven by opening the door.
H) Remove the two beakers from the oven and measure the temperature of the water by stirring
the water with the thermometer and noting the readings.
Example
/
Initial temperature
- . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Tl = 23°C T2 =
Temperature after 1 min. 51 set
24°C
.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I . . . .
Tl = 33°C
T2
= 34°C
I
Temperature difference Cold-Warm
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..*...........
Mean temperature rise AT
AT1 = 10°C AT2 = 10°C
!
I
. . . . . . . .
Measured output power
AT = (AT1 +AT2) /‘2 = (103C + 10°C) / 2 = 10°C
I
/
The equation is “P= 75 x AT”
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
P=
75 x 10°C = 750
Watts
NOTE: The measured output power should be at least +I5 % of the rated output
power.
CAUTION: 1°C CORRESPONDS TO 75 WATTS.
REPEAT MEASUREMENT IF THE POWER IS INSUFFICIENT.
(Tl OC)
(T2 OC)
(T2 OCI
Heat up for 1 min. 51 sec.
MICROWAVE OUTPUT POWER (1 LITRE WATER LOAD)
(RD82AOZJ)
The following test procedure should be carried out with the mi&owave 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-
5
R -4A54
R-4A54B
TEST PROCEDURES (CONT’D)
PROCEDURE
LETTER
COMPONENT TEST
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/4.187=VxAT
P(W)=4.187xVxAT/t
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
. . . . . . . 1 Of2”C Heating time . . . . . . . . . . . . . . . . 47 sec.
P = 90 x AT
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 f 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 5°C.
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 0.1 “C at minimum and an accurate
thermometer.
7. The water load must be (1000 + 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 12 = 21 “C)
7. Calculate the microwave power output p in watts from above formula.
/
Initial temperature
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tl = 11 “C
Temperature after (47 + 2) = 49 sec. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . T2
= 21 “C
I Temperature difference
Cold-Warm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AT1
= 10°C
/
I
Measured output power
The equation is “P=
90 x
AT”
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P= 90 x 10°C = 900 Watts
JUDGMENT: The measured output power should be at least +I5 % of the rated
output power.
CAUTION: .l”C CORRESPONDS TO 90 WATTS. REPEAT MEASUREMENT IF THE POWER IS
INSUFFICIENT.
R-4A54
R-4A54B
TEST PROCEDURES (CONT’D)
PROCEDURE
LETTER COMPONENT TEST
1 ooog
+
T2”C
Heat up for 49 sec.
(RD82u03Ul
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 troubleshooting guide given below for repair.
Problem: POWER ON, indicator does not light up.
/STEPS :
OCCURANCE
1
CAUSE OR CORRECTION
/ 1
/
/
/The rated AC voltage is not present at POWER ter- j Check supply voltage and oven power cord. Please /
j minal of CPU connector (CN-A)
j I
use term “Low voltage transformer” when refering to I
’ transformer Tl
I
j 2
I
/ The rated AC voltage is present at primary srde of low Low voltage transformer or secondary circuit defec- j
1 voltage transformer.
tive Check and repair.
I
I Only pattern at “a” is broken.
; ‘Insert jumper wire Jl and solder.
I
; 4
/ Pattern at “a” and “b” are broken.
I
I ‘Insert the coil RClLF2003YAZZ between “cl’ and
1
/
: “d”.
M
RELAY TEST
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.
1. CARRY OUT 30 CHECKS
2. Disconnect the leads from the primary of the power transfomer. Make sure that the leads remain isolated from other oven components and chassis. (Use insulation tape if necessary.)
3. Close the door.
4. Reconnect the supply.
5. 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.
6. RYl 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
7
Loading...