Sharp R-5H53 Service Manual

Page 1
R-5H53
SHARP SERVICE MANUAL
s9111 R5H53J::
MICROWAVE OVEN
MODEL
in interests of user-safety the oven shcutd be restored :G .;s ,~rrg,r;d’ condition and oniy manufacturer orlginal svare qarrs -nus; x ~sec:
TABLE OF CONTENTS
Fage
APPEARANCE
VIEW
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . INSIDE
COVER
GENERAL
IMPORTANT
INFORMATION
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . .
. .._.......... I
CAUTION, MICROWAVE RADIATION,WARNING ,,.......,.,..,..,,....,......,,.....,...,...,.,,....................,..,.,....,...... 1
PRODUCT SPECIFICATIONS
. . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2
OPERATION
SEQUENCE
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ......
..
3
FUNCTION
OF IMPORTANT
COMPONENTS
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
..,....
4
SERVICING
. . . . . . . . . . . . . . . . . . . . . . . ..*..............................................................................................................................
5
TEST
PROCEDURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TOUCH
CONTROL
ASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDl MICROWAVE
MEASUREMENT
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
WIRING
DIAGRAM
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PICTORIAL
DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
...............................................................
6
............................................................
16
RE .....................................................
23
............................................................
27
............................................................
28
............................................................
29
CONTROL PANEL CIRCUIT
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
30
PRINTED WIRING DIAGRAM
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
31
PARTS
LIST
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................
32
PACKING
AND
ACCESSORIES
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
38
SHARP CORPORATION
Page 2
R-5H53
APPEARANCE VIEW
1. Ventilation openings
2. Oven lamp
3. Oven door with see through window
4. Coupling
5. Roller Stay
6. Removable turntable
7. Hinges
8. Safety door latches
9. Door open button
10. Touch Control Panel 1 1. Digital readout
12. Waveguide cover
13. Access cover for oven lamp replacement
Touch Control Panel
SENSOR INSTANT ACTION
1
f
I
-SENSOR !&ANT ACTlOb -
PADS
J
Touch once to cook or reheat
4 popular menu.
iRESh ‘VEGETABLES
II
REHEAT
BEVERAGE
1 -NUMBER PADS
k L
I / !=
i­/
& r-
-­I
r=
t
/ 1
I 1
1 /
I 1
/ I
I
/
-I
+-
C r
t
SENSOR COOK PADS
Touch to select Fresh or
Frozen foods In Sensor modes.
( I
SENSOR COOK MENUS~-----l~
EASY DEFRQST PAD
/ i
Touch to defrost entering weight.
MEMORY
Touch to enter one frequently used cooking programme.
Touch to recall the memorized
programme.
I
VARIABLE COOKING CONTROL PADS
power setting. If not touched, HIGH is auto­matically selected.
STOP/CLEAR PAD -------l j
L
Touch to erase during pro­gramming. Touch once to stop operation of oven during cooking: touch twice to cancel cooking pro­gramme.
SENSCG C03K
’ Ross’ bee:
Z qoast lamb
cioast zh1cke.n
1 c
4 Lorned ;nea! 5 Desserts 0 Cake / Pudciric
7 Stewed iruc:
b Preserves
iI
I
9 Bacon
lC Porrlcge
ii 6 1
11 SOUP
It
12 Casserole: ?3 Fish fillets
j/ 7 i
1.4 Fice
!I
J
15 Pasta
16 Frozen o!nners
l? Pastrces
js/
- MEMaRY I
*Place the roller stay on the
coupling in the oven and seat the turntable on the roller stay.
I i­I
Touch to enter cooking times, clock time, weight or quantrty of food, or to select the Sensor Cook menus.
-MORE( I\ 1, LESS{ v 1 PADS
1 1 ! 1
, I i j
I 1 I ;
i 1
Ji
IL
,
1
Touch to increase/decrease the time in one minute incre-
ments during cooking or to
alter the doneness for the Sensor Cook, Sensor instant Action or Easy Defrost modes.
--INSTANT COOK/START PAD
Touch once to cook for 1 minute at HIGH or increase by
1 minute multiples each time this pad is touched during cooking. Touch to start oven after setting programmes.
r
AUTO START/CLOCK PAD
Touch to set clock or Auto
’ Start time.
Page 3
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Page 4
R-5H53
PRODUCT DESCRIPTION
SPECIFICATIONS
ITEM
Power Requirements
240 Volts 50 Hertz
DESCRIPTION
Single phase, 3 wire earthed
-____
Power Consumption
1500w
__----- ---_
___----
Power Output
750 watts nominal of RF microwave energy (2 litre water load) 850 watts (IEC-705 1988) Operating frequency of 2450M Hz
_---
Case Dimensions
Width 616 mm
Height 366 mm Depth 477 mm
Cooking Cavity Dimensions
--____ Control Complement
Width 406 mm
, Height 248 mm
Depth 422 mm
’ Touch Control System
Clock( I:00 - 12:59 )
Timer (0 - 99 min. 99 sec. )
Microwave Power for Variable Cooking
Repetition Rate;
HIGH
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Full power throughout the cooking time
MED
HIGH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
approx. 70% of Full
Power
MED
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
approx. 50% of Full
Power
MED LOW (DEFROST)
. . . . . . . . . . . . . . . . . . . . . . . . . . approx. 30% of Full Power
LOW
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . approx.
10% of Full
Power SENSOR COOK (Fresh 1 -- ‘I 5, Frozen 11 -- 17) INSTANT COOKSTART AUTO START MEMORY
Se! Weig n:
SENSOR INSTANT ACTION EASY DEFROST MORE/LESS pads
Approx. 23 kg
NOTE: Numbers and letters shown after sentences such as “RD44101 U” are for factory use only.
2
Page 5
R-5H53
OPERATION SEQUENCE
ription of component functions
The fo llowing is a desc during oven operation.
OFF CONDITION
(RD7:“O:U;
Closing the oven door activates all the door interlock switches: upper latch switch and lower latch switch. (In this condition,
the monitor switch contacts are opened.) The stop switch is activated by the latch head.
When oven is plugged In, 240 volts A.C. IS supplied to the control unit. But no components in ine oven will operate. (Figure O-l on page 28)
1. The display will show flashing “88:88”,
2. To set any program or set the clock, you must touch
the STOP/CLEAR pad first.
3. The dispiay WIII clear and ” ” appears in :he d;.-;-
play and the time
counts up every minute:.
NOTE:When the door is opened by pushrng the door
open button, the contacts of :he reiav RY -1 sre closed, ther! rhe oven
kmp lights.
MICROWAVE COOKING CONDlTfON
HIGH COOKING
Program desired coctk~ng trme and Variaole Cook+ng Control by touching ?he NUMBER pads and the HiGti pad of the Variabi
e Cooking Cont:ol. When rhe STP?,T
pad is touched,
the foiiowing operations occur:
1. The contacts of reiays closed and components connected to the relays are turned on as foilovds.
(Figure O-2 on page 28’1
~__. I---
Relay
cOcnt?C:ed ccmoGnet77is
__~_ .-._.- --_-- _~-- __ _________
RY-1
Oven lamp,Turncable rrotor Fan motor
RY-2
Power Transformer
-______--
2. 240 volts A.C. is supplied to the primary winding of the power transformer. The voltage is converted to about 3.3 volts AC. output on the filament winding and approximately 2000 volts A.C. high voltage on the secondary winding.
3. The 3.3 volts filament winding voltage heats the magnetron filament and the 2000 volts high voltage is sent to the voltage-doubling circuit, where it is doubled to a negative voltage of approximately
4000 volts D.C.
4. 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.
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 oven door is opened during a cooking cycle, the monitor switch. upper and lower latch switches are activated with the followrng resuits. The crrcuits to the turntable motor, fan motor and
high voltage components are deenergized, the oven lamp remains on,
and the digital readout displays the time still remaining in the cook cycle when the door was opened.
7 The monitor switch IS electrrcally monrtoring the
operation of the upper and !ower latch switches and 6 mec5ts nrcally associated with the door so that !t jNi!i funGion tn the foilowtng sequence.
(1 ) ‘v?ihen the door is opened from a closed posi-
Thor;. the upper larch and lower latch switches operate to open their contacts first, and then Ihe
sontacts of
the monrtor swatch ciosed and
the :contacts of the stop switch open.
t 21 Wheq the door IS closed from the open position,
:ne comacts oi rhe moG:iIor switch should be craned firs: and rhe ,zontac;s of :he stop swatch ar;>
ziosec and ther tipcer !atch and lower
;atc,les are ZiGsee,
/ T’
*
-?cs sf 1,113 ap~?r ap‘-j ;c;Q-~>~: ;aTcjy
di LV
5wttch switches
;a’: wit’r: -:p,eir {be “,o~~tac:s l;i:>~e~:i i,\!ken -,he doOr -
!2
pr.C;n!AA
vyv* i”.A,
T r; e
ccjcn:::zr S\$/iiCh \.A/;ii
form s short c:rc;:i;
Thro!-:cjh ‘h? :‘i!$+ and ihe ‘-!pLy?r _31?c ‘cJ\n/ef ja:ch
ftise
s*jk ctc:?es
i:du~;f-~ :pe fus5 tfj brr~~,y
MED HIGH, MED; MED LOW (DEFROST), LOW COOKING When :iarrabie Cooking - Power 1s programmed, the 240 voits A.C. is supplied to the power transformer rntermittent!y through the contacts of relay! RY -2) which is operared by the control unrt within a 32 sec­ond time base. Microwave power operation IS as fol-
iO\NS:
_.____
VARI-MODE
ON TIME
OFF TIME
-__.
HIGH
32 sec. 0 sec.
(100% power)
-__
MED HIGH
24 sec. 8 sec.
(approx. 70% power) MED
18 sec. 14 sec.
(approx. 50% power) MED LOW (DEFROST) 12 sec.
20 sec.
(approx. 30% power) LOW 6 sec. 26 sec.
(approx. 10% 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.
(RD71401 U)
3
Page 6
R-5H53
FUNCTION OF IMPORTANT COMPONENTS
DOOR OPEN MECHANISM
The door can be opened by pushing the open button on the control panel, refer to Figure D-l. When the open button is pushed, the open plate on the open device pushes in the door lever on the door, operating the latch head linkage.
The lower and upper latch heads are moved upward, and released from the lower and upper latch hodks. Now, the door can be opened.
(RD72GOl U;
\
UPPER LATCH
LOWER
HEAD
LATCH
HEAO
DOOR
OPEN BUT-TON
Figure D-l.
Door f)pen Mechanism
UPPER AND LOVVER LATCH SWITCHES
The lower latch switch IS mounted in the lower latch hook and the uppe! latch switch is mounted in the uoper latch hook.
They are activated by the latch
heads on the door.
When the door is opened, their
switches interrupt the circuit to all components except the oven lamp and touch contra! panel. A cook cycle can not take piace until the door is firmly closed there by activating both interlock switches.
MONITOR SWITCH
The monitor switch is activated (the contacts opened) by the upper latch head on the door while the door is closed. This switch is intended to render the oven in­operative by means of blowing the fuse when the contacts of the upper latch switch and the lower latch switch fail to open when the door is opened.
Function
1. When the door is opened, the monitor switch con­tacts close (to the ON condition) due to their being normally closed. At this time the upper latch switch and the lower latch 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 opened first and then the con-
tacts of upper and lower latch switches close. (On opening the door, each of these switches operate
\
tnverselv.)
3. If the door is opened and the contacts of the upper
latch switch and lower latch switch fail to open, the fuse blows simultaneously with closing of the monitor switch contacts.
CAUTION: BEFORE REPLACING A BLOWN FUSE,
TEST UPPER LATCH SWITCH, LOWER
LATCH SWITCH, MONITOR SWITCH
AND MONITOR RESISTOR
FOR
PROPER OPERATION.
(REFER TO
CHAPTER “TEST PROCEDURE”).
Figure D-Z Latch Switches and Monitor Switch
MAGNETRON TEMP. FUSE
The temperature fuse located on the cavity top plate near the magnetron to prevent damage to the magnetron if an overheated condition develops in the tube due to cooling fan failure, obstructed air ducts, dirty or blocked air intake, etc. Under normal operation, the temperature fuse remains closed. However, when abnormally high temperatures are reached within the magnetron the temperature fuse will open at 115’C, causing the oven to shut down.
This is a fuse and it does not reset.
OVEN THERMAL CUT-OUT
(‘RD72403U)
The thermal cut-out located on the wall of the steam duct. It is designed to prevent damage to the oven cavity, if foods in the oven catch fire due to over heat­ing produced by improper setting of cooking time or
failure of control unit etc..
Under normal operation, the oven thermal cut-out re-
mains closed.
However, when abnormally high tem­peratures are reached within the steam duct, the oven thermal cut-out will open at 115OC, causing the oven to shut down.
(‘RD72407U)
Page 7
R-5H53
SERVICING
WARNING TO SERVICE PERSONNEL
Microwave ovens contain circuitry capable of producing very high voltage ;;nd current, contac: lowing parts:
yjj;n ;oi -
High voltage capacitor, Power transformer, Magnetron, High voltage re
ctifler assembly, High vo;;age 7a~ness.
REMEMBER TO CHECK JiJ
1) Disconnect the supply.
2) Door opened, and wedged open.
3) Discharge high voltage capacitor ’ WARNING AGAINST THE CHARGE OF THE
HIGH-VOLTAGE CAPACITOR
The high-voltage capacitor remains ,zharged 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 hrgh-voltage rectifier: against the chassis with the use of an insu­lated screwdriver.
Sharp
recommend that
wherever possibie fault-finding is carried out wirh the suppiy discon­nected. It may in, some cases, be necessary to connect the supply after the outer case has been removed, in this event carry out 30 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 3[3, checks and reconnect the leads to the primary of the power transformer.
REMEMBER TO CHECK B
11 Reconnect all teads removeo fro,m car-
: , D (2 :- 2 :? ; c
_-
during testing.
2) Replace the ourer case i,catsl!nel;
3) Reconnect the suppiy a?;
Run the oven Checic ail ftii;ct:cr;s
Microwave ovens should not be ru:; ?rn~:\. T~l -0s~ for the presence of m;Zrovvave 3nerf~v JV::-~~:” s
3
cavltjf, p/aca a czg of CsiC; :~a:?-‘-’
‘2 r
, ‘?~e 3~ ?r~
‘,urc:table, close the dt>or acl:! set Fe ;~s~:~:e~.b,~~+t~
timer for two (2) lmjc:L;les. ~53: r,ble ,qc:-j5r 12~ 1 -;
H iGH and pusi? the ST;;=- z~:tfi=
.iui.
'l',jr‘t! r’?t
T i,‘i; 2
.q:qutes has $iapsed , ‘;j,~e: 3? 7~r5 ~:a:?mii~~ I~-?.::.
.A% -v
rha;
the water 2s new 70: !f :h* :,v&er ;erya;rs 2-i~ carry 0~1 3C checks 3cd s-,3,y~~ire :?,E -:­nections to the corn~o~e:-: 5eifig xstss!
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.
(RD81 GO1 H)
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 be-
cause of a blown fuse in the monitor-upper latch-lower latch switch circut, check the monitor switch, upper and lower latch witches and monitor resistor before reolacina the fuse.
Page 8
R-5H53
TEST PROCEDURE
POSSIBLE CASE AND ~;X'~~TIVE
ONDITION
PROBLEM
)FF :ONDITION
N ONDITION
ENSOR 30KING 3NDITION
Home fuse blows when power supply cord i: plugged into wall receptacle.
FUSE M8A blows when power supply cord is plugged into wall receptacle. (The door is closed]
“88:88” does not appear in display but powel
supply cord is plugged into wall receptacle.
Display does not operate properly wher STOP/CLEAR pad is touched. (An audible signa should sound and time of day should appear or display.
Display appears, but oven lamp does not light with door open.
When the door is opened, fuse M8A blows, Fan motor does not operate.
(Display appears)
Turntable motor assembly does not operate
(Display appears)
Oven lamp does not light. (Display appears)
Home fuse or breaker operates when the IN­STANT COOK/START pad is touched.
oven seems to be operating but little or no heat is produced in oven load. (Microwave cooking control is set at FULL POWER position.)
Oven does not cook properly when programmed for variable cooking powers. (Oven operates properly at FULL POWER)
Oven goes into cook cycle but shuts down before end of cooking cycle.
Oven stop as soon as when the INSTANT COOK/START pad is touched.
Oven does not cook properly when programmed in the EASY DEFROST cooking mode. (Oven op­srates properly by manual cooking mode.)
&en is in the sensor cooking condition or one iouch reheat cooking condition, but AH sensor does not end 1st stage or does not stop cooking cycle or the oven stops soon.
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Page 9
R-5H53
RE = Replace / CK = Check
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7
Page 10
R-5H53
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
MAGNETRON TEST
NEVER TOUCH ANY PART IN THE CIRCUIT WITH YOUR HAND OR AN INSULATED
TOOL WHILE THE OVEN IS IN OPERATION.
I
CARRY OUT 3D CHECKS
Isoiate 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 fil­ament 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 replaced
MICROWAVE OUTPUT POWER (2 liter water load)
(RD82AOl Uj
The following test procedure should be carried out with the microwave oven in a fully assembled conditron (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. calorie is generated.
When P(W) heating works for t(second), approximately P x t/4.2
On the other hand, if the temperature of the water with V(ml) rises AT
(‘C) dunng this microwave heating period, the calorie of the water is V x AT.
-
The formula is as follows;
P x t /’ 4.2 = V x AT
P (W) = 4.2 x V x CIT : t
:Cld:r condition for the water load !s as follows:
Room temperature . . . . . . . . . . . . . . . . . . . . around 20°C
Water load . . . ...2300 mi
Initial temperature
Power supply Voltage . . . . . . . . . . . . . Rated voltage ;
. . . . . IO+1 ‘C
P = 75 x CT
Heating time . . . . . . 1 min. 52 sec. ~
I
Vieeasurin~ method:
Li,‘i Use two i iitre Pyrex beakers with a diameter of approximately of 7 2cms.
51
Place i iitre of 1 O’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. Dj Piace th t e wo beakers as touching each other in the centre of the cavity. E) Set the timer to f minute and 52 seconds at 100% power (the time required to raise the water
temperature 7 0 degrees C.) FI The time must be measured with stopwatch or wristwatch. G) After 1 minute and 52 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
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Temperature after 1 min. 52 set
Tl =lO”C T2=11”C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Temperature difference Cold-Warm
Tl = 20°C T2 = 21 “C
= =
Mean temperature rise AT
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ATI 10°C AT2 10°C
. . . . . . . .
Measured output power
AT = (AT1 +AT2) / 2 = (IO’C + 10°C) / 2 = 10°C
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
1
power.
CAUTION: 1°C CORRESPONDS TO 75 WATTS.
REPEAT MEASUREMENT IF THE POWER IS INSUFFICIENT.
8
Page 11
R-5H53
TEST PROCEDURES (CONT’D)
PROCEDURE
LETTER
COMPONENT TEST
I
q-1 OC)
iT2 OC!
i-r: OCi
o-2 “Cl
Hea: up for I mm. 52 set
MICROWAVE OUTPUT POWER (lEC-705-1988)
The following test procedure should 5e carried out with :he mtc:ob~,ave oven in a fuiiy assembled condition (outer case fitred j I
Microwave output power from the magnetron can be measured by way of IEC 705. i.e. it can be measured by using waIer load how +m:~ch I: car: be absorbed by the water load. To measure the microwave output power !r! the microwave ov?g, the reiatton of [;a;­orie and watt is used. When PtW! heating works for t(second), ar=erox,ma:eiv is generated. On :he other hand
P x t, 4 18: calorie
If :he temperature oi Ihe water JV!T~ 4::~:i‘; VISES AT ; C: durlnc:
this microwave heating per:od, the Calorie *z~f rhe wager is ‘V x AT
The formula is as follows:
Pxt
a,?87 = L, x 2-T
p p/) = 4 18: ,y ‘,I .‘( ‘\T
:
Our condition for the water ioad is as foiiows:
Room temperaturF
.I.. ,.. . . .
arouna 20-G
Waler load
. . . . . . . . SO0 g
?o\,j/er SCCClt ‘joitage
P = 85 x AT
Iriit!ai tempera:l;re . . . . . .I 0 12-C
Heat:ng Lime
~- --- --~--.-- ~~ - --~ --
Rated *image
49 set
Measuring condition:
1. Container The water container must be a cylindrrcal borosilicate glass vessel naving a maxrmum mater!ai 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)X.
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 scaied 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 initiai temperature of the water before the water is added to the vessel (Example: The initial temperature Tl = 11 “C)
2. Add the 7 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 n 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.
Initial temperature
__.-___--
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tl = 11°C
9
Page 12
R-5H53
TEST PROCEDURES (CONT’D)
PROCEDURE
LETTER COMPONENT TEST
Temperature after
(49 + 2) =
51
sec.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
T2 = 21 “C
Temperature difference Cold-Warm
.,.................................................,..........,..... ATI = 10°C
Measured output power
The equation
is “P= 85 x AT” . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
P= 85 x 10°C = 850 Watts
-_____ -___
JUDGMENT: The measured output power should be at least +I5 % of the rated
output power.
CAUTION: 1°C CORRESPONDS TO 85 WATTS. REPEAT MEASUREMENT IF THE POWER IS
INSUFFICIENT.
T2”C
*eal up for 51 sec.
(RD82A03U)
B POWER TRANSFORMER TEST
WARNING: High voltages and large currents are present at the secondary winding
and filament winding of the power transformer. It is very dangerous to work near this part when the oven is on.
NEVER make any voltage measurements of the high-voltage circuits, including the magnetron filament.
:ZkFFk’ 3:-lT
32 CHECKS,
Disconnect the leads to the primary winding of the power transformer. Disconnect the filament and secondary winding connections from the rest of the HV circuitry. Using an ohmmeter, set on a low range, it is possible to check the continurty of al! three windings. The following readings shouid be obtained :-
a. Primary wrnding ----------less than 7 .5 ohms.
5. Secondary winding -------80 ohms.
c. Filament wending ---------less than 2 ohm.
If the reading obtained are not as stated above, then the power transformer is probably faulty and
should be replaced.
CARRY OUT 4J CHECKS
(RD82405J1
c HIGH VOLTAGE RECTIFIER ASSEMBLY TEST
HIGH VOLTAGE RECTIFIER TEST
CARRY OUT 3D CHECKS.
isolate the high voltage rectifier assembly from the HV circuit. The high voltage rectifier can be
tested using an ohmmeter set to its highest range. Connect the ohmmeter across the terminal
B-CC of the high voltage rectifier and note the reading obtained. Reverse the meter leads and note
IO
Page 13
R-5H53
TEST PROCEDURES (CONT’D)
PROCEDURE
LETTER
COMPONENT TEST
this second reading. The normal resistance is infinite in one direction and more than 100 k!2 In the other direction.
CARRY OUT 4R CHECKS ASYMMETRIC RECTIFIER TEST
CARRY OUT 3D CHECKS.
*qzL ‘JOLTAGE
REcT,F,ER
Isolate the high voltage rectifier assembly from the HV circuit. The asymmetric rectifier can be
tested using an ohmmeter set to its highest range.
Connect the ohmmeter zc:oss the :ermlnals ATB of the asymmetric rectifier and note the reading obtained. Reverse the meter leads and note this second reading. If an open circuit is indicated in both directions then the as:/mme:ric rectifier
is good. If an asymmetric rectifier is shorted in either direction, then the :he asymme:r:c ecrliier is probably faultly and must be replaced with the high voltage rectifier.
When the asvmmwic rectifier is defective, check whether magnetron, high voltage rectifier, high voltage sabre or ment winding of the power transformer is shorted.
fila-
CARRY OUT 4R CHECKS NOTE: FOR MEASUREMENT OF THE RESISTANCE OF THE RECTIFiE?, T?E !3&3-E?tzS
OF THE MEASURING INSTRUI\/IENT MUST HA,‘V/E ,A ‘Jc-JLTAGE AT LEAST E i’C~y.5
BECAUSE OTHERWISE AN iNFINITE RESISTANCE MIGHT BE SHC’\/VN iiN BGik DIRECTIONS.
G’-x-“- --
4rOL3’d.‘,
D
HIGH VOLTAGE CAPACITOR TEST
CARRY OUT 30 CHECKS.
A.
B.
C. D.
E.
F.
G.
Isolate the high voltage capacitor from the circuit.
Continuity check must be carried out with measuring instrument which is set io the highesT resistance range. A normal capacitor shows continuity for a short time (kick) and then a resisiance of about 10 MR after it has been charged.
A short-circuited capacitor shows continuity all the time. An open capacitor constantly shows a resistance about 10 MQ because of its internal 10
MQ resistance.
When the internal wire is opened in the high voltage capacitor, the capacitor shows an in­finite resistance
The resistance across all the terminals and the chassis must be infinite when the capacitor
is normal.
If incorrect readings are obtained, the high voltage capacitor must be replaced.
CARRY OUT $J CHECKS
(RD82604J)
E
SWITCH TEST
CARRY OUT D CHECKS. Isolate the switch to be tested and using an ohmmeter check between the terminals as described
in the following table.
Table: Terminal Connection of Switch
Plunger Operation
COM to NO
COM to NC
COM; Common terminal
Released
Open circuit
Short circuit
NO; Normally open terminal
Depressed
Short circuit
Open circuit
NC;
1
Normally closed terminal
If incorrect readings are obtained, make the necessary switch adjustment or replace the switch.
CARRY OUT $J CHECKS.
11
Page 14
R-5H53
TEST PROCEDURES (CONT’D)
PROCEDURE
LETTER
COMPONENT TEST
F
MONITOR SWITCH TEST
CARRY OUT 3D CHECKS.
Before performing this test, make sure that the upper latch switch lower latch switch are oper­ating properly referring to the above Switch Test Procedure. Disconnect the wire leads from the monttor switch (NC) terminal. Check the monitor switch operation by using the ohmmeter as
follows. .
BLACK WIRE
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 me-
ter should indicate an open circuit. If
Improper operation is indicated, re­place the defective switch. After test­ing the monitor switch, re-connect the
wrre lead to the monitor switch (NC) terminal.
CARRY OUT 4R CHECKS
G
~~~~
TEMPERATURE FUSE TEST
CARRY OUT 30 CHECKS A continuity check across the temperalure fuse termrnals should Indicate a closed circuit unless
the temperature of the temp. fuse reaches approxrmatelv
“r ‘I 5’ C. An open the temperature fuse indicates overheating of the magnetron assembfv. If the temperature fuse indicates a open err­cuit, replace the temperature fuse and check for restricted air flow to the magnetron through the opening In the chassis, especrally the air duci ant: fan motor.
CARRY OUT &R CHECKS
THERMAL CUT-OUT TEST
CARRY OUT 3D CHECKS
A continuity check across the thermal cut-out terminals sould indicate a closed circuit. If the temperature of the steam duct reaches approximately 115°C the thermal cut-out opens. (This thermal cut-out reset at below -2O’C) An open thermal cut-out indicates overheating of the oven cavity. Check for restricted air flow to the magnetron through the opening in the chassis, espe­cially the air duct and fan motor.
CARRY OUT Q CHECKS CAUTION IF THE THERMAL CUT-OUT INDICATES OPEN CIRCUIT, REPLACE THE THER-
MAL CUT-OUT.
I
BLOWN FUSE F M8A
CARRY OUT a CHECKS
1. If the fuse M8A is blown, there could be 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, there could be short in the asymmetric rectifier 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 replace the defective parts or repair the wire harness.
3. If the fuse M8A is blown when the door is opened, check the upper latch switch, lower latch switch monitor switch and monitor resistor.
12
Page 15
R-5H53
TEST PROCEDURES (CONT’D)
PROCEDURE
LETTER
COMPONENT TEST
If the fuse M8A is blown by incorrect door switching replace the defective switch(s) and
the fuse M8A. CARRY OUT 4R CHECKS
CAUTION: Only replace fuse M8A with the correct value replacement.
J MONITOR RESISTOR TEST
CARRY OUT 30 CHECKS. Disconnect the leads from the monitor resistor.
Using an ohmmeter and set on a low range. Check between the terminals of the monitor resistor. The resrstance of monitor is aporox. 0.8Q. If incorrect readings are obtained, replace the monitor resistor and check the fuse ~Vl8A. upper
latch switch, lower iatch swatch and wire harness. CARRY OUT @ CHECKS.
TOUCH CONTROL PANEL ASSEMBLY TEST
The touch control panel consists of circurts including semiconductors such as LSI ICs, etc Therefore, unlike conventional microwave ovens, proper maintenance cannot be performec \mitl? only a voltmeter and ohmmeter.
vided into two units, Control
In this service manual, the touch control panel assembly IS do-
Unit and Key Unit, and troubleshooting by unit replacement is de-
scribed according to the symptoms indicated.
1. Key Unrt. The foiiowing symptoms indrcate a defective key unrt. Replace the kev unit. a) When touching the pads, a certain pad produces no signal at ail. 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. Replace the controi unit. 2-l tn 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.
d) Proper temperature measurement is not obtained.
L
EASY 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 “EASY DEFROST” pad.
(3) Touch the number 5 pad to enter weight (0.5 Kg. is set). (4) Touch “START” pad. Now the oven is in EASY DEFROST cooking condition. (5) The oven will operate as follows.
1 ST STAGE
2ND STAGE
LEVEL
TIME
LEVEL
TIME
100?6
75sec.
50%
125sec.
3RD STAGE
LEVEL
TIME
0%
400sec.
4TH STAGE
LEVEL
TIME
30% 160sec.
13
Page 16
R-5H53
TEST PROCEDURES (CONT’D)
PROCEDURE
LETTER COMPONENT TEST
(6) If improper operation is indicated, the control unit is probably defective and should be
checked.
M RELAY TEST
Remove the outer case and check voltage between Pin Nos. 1 and 3 of the 3-pin connector (A)
on the control unit with an A.C. voltmeter. The meter should indicate 240 volts, if not check oven
circuit.
RYI and RYZ 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 unit is defective.
I
RELAY SYMBOL
OPERATIONAL CONNECTED COMPONENTS
VO LTAG E
I
RYI Approx. 13 V.D.C. RY2
ADDrox 14 V. D C.
Oven lamp/Turntabie motor/Cooling fan motor Power transformer
N
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 trou­bieshooting guide given below for repair.
Problem. POWER ON, indicator does not light up.
__--____ ---__
ZTEPC
Lj i .
OCC!JRRENCE CAL’SE OR CORRECTION ---__
7 ‘TL -
-____
I I!e rated vo!tage IS no: apolled to POWER terminal
Check supply voltage and oven main unit
si CPU connector (CN-A)
____--___- _
-,
The rated voltage IS spoiled to pr!mar\ srde of power
Power transformer or secondary cIrcuIt defective.
transfcrmer Check and repair
~--____
3nli ;latterr a; “a’ IS broken
‘inser: lumper wire Jl and solder.
Pa:reri- a: ’ 2”
apd “0” are broker
*insert the coil RCILF2003YAZZ between “c” and
“d”
hJC3T[ L
4+ tpe rime of tpese repairs make a vlsua! IP- spect’on of the varlstor fol burning damage and examine the transformer with tester for the presence of [aver shor?-clrcult (check primary coil resisrance) It anv abnormal conaittoT? IS detected, replace the defective parts.
0
AH SENSOR TEST
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”.
(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.
14
Page 17
R-5H53
TEST PROCEDURES (CONT’D)
PROCEDURE
LETTER
COMPONENT TEST
(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 vapor given of by the spray and turn off before food is properly cooked.
(8) After about 41 minutes if the sensor has not detected the vapor 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 op-
eration. The cabinet should be installed and screws tightened.
(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 SENSOR COOK FRESH pad and number pad 8. Now, the oven is in the sensor
cooking condition and SC-8 will appear in the display.
(5) Touch Start pad.The oven will operate for the first 16 seconds, without generating micro-
wave energy.
NOTE: ERROR will appear if the door is opend or STOP/CLEAR pad is touched during first stage
of sensor cooking.
(6) After approximately 16 seconds, microwave energy is produced, oven should turn off when
water is boiling (bubling).
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-l. 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 SENSOR COOK FRESH pad and number 8 pad. 6-5. Touch Start pad. The control panel is in automatic Sensor operation. 6-6. The oven will turn off automatically when 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 lower portion of 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 SENSOR COOK FRESH pad and number 8 pad. 6-2. The control panel is in the sensor cooking operation. 6-3. After approximately 20 seconds, push plunger of select switch.
This condition is same as judgement by AH sensor. 6-4. After approximately 3 seconds, cooking operation turns off, an audible signal will
sound, and the display will then revert to the time of day.
15
Page 18
R-5H53
TEST PROCEDURES (CONT’D)
PROCEDURE
LETTER COMPONENT TEST
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
I
To Connector (FI on Control Unit
Rl,R2 : 22R &- 1% 1 i2W
R3:lOkQ + 5% 1/4W
R4 : 1 MCI f 5% 1/4W
NC NO
F-l - m
F-Z- rc
Sensor Dummy Resistor Circuit
OUTLINE OF TOUCH CONTROL PANEL
ihe touch control section consists of the foliowing
units as shown rn the touch control panei circuit.
iI> Key Unit (2) Contra! Unit
Tne prrnctpal functions of these units and the signals
communrcated among them are explained beiow.
Key Unit
The ke\f unii is com2osec of a matrix. signals generated : r:
the iSI are sent T#-
; e
P63,P04,P36,PG7, p: 7 P: fBnrP< Jey
unit
thrnugh
LYnen a key pat !s roscned, a signal is c.ompieted
through
:ne kev dni: and passed oack to the LSi
:aroUgh zs-;-?Iz 12 i>erf5:7- the funcirc>T :r,a: n/as ye­ouesied.
Control Unit
Zontroi iintt cons:sis .of iSi. power source circuit, synchronizrng signal crrcurt. ACL circuit, buzzer circurt, temperature measurement clrcu;:,
reheat sensor cfrcuit
and Indicator circuit. ‘I) LSI
This LSI controls tne
temperature measurement signai. reheat sensor signal. key strobe signal. relay driving signai for oven function and indicator sig­nal.
2) Power Source Circuit
This circuit generates contra! unit.
voltage necessary in the
Symbol Voltage Application
----­VC
-5.ov
VP
LSI (ICI), ACL circuit
-26V
Fluorescent display tube : Grid
VF-
3Vac
and anode voltage
Filament of fluorescent display
VF+
----
tube (VF- to VF-C voltage)
3)
4)
5)
fi)
71
8)
9)
Synchronizing Signal Circuit
The power source synchronizing signal is avaiiable
in order to compose a basic ‘standard time in the clock circuit.
It accompanies a very smali error because it works
on commercral frequency.
ACL Circuit
A. circuit to generate a signal which resets the LSI
to ;he inltiai state when power is supplred.
&uzzer Circuit
The buzzer responds to signais from the LSI to emrt noticing sounds (key touch sound and com-
aletion sound).
(RD9; AA1 U/
Reheat Sensor Circuit
This ctrcuit detects moisture of a food which is cooking,to allow its automatic cooking.
Stop Switch
A switch to “tell” the LS! if the door is open or closed.
Relay Circuit
To drive the magnetron, fan motor. turntable motor and light the oven lamp.
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 cath­ode 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.
16
Page 19
R-5H53
LSl(lZA393DR)
DESCRIPTION OF LSI
The I/O signals of the LSl(lZA393DR) are detailed in the following table.
PIN NO. 1
L
SIGNAL VREF
I
l/O
IN
Reference voltage input terminal.
A reference voltage appiied to the A/D converter In the LSI. Connected to GND (OV)
RD(:Ij<Aji
PIN NO.
2-4
-__-
1 SIGNAL IN7-IN5
I
I/O
IN
Heating constant compensation terminal.
+?),G>.-ji:_it
PIN NO 5
-____-- -.--__- ~--__--- ~~
-~
_i
SIGNAL INA
__- --~- - ----~~~ ~~_. ~~ I ~
It 0 / IN
Terminal to change functions according to the model.
Signal in accordance with the model in operation is applied to se? up its function
i-‘
_ ,-A -2
1
_~ >-- ._/
PIN NO. 6 SIGNAL
i rd3
i 0
IN
Input signal which communicates the door open!‘close information to LSI.
Door closed; “H” level signal! OV). / Door opened: “L” level signal(-5V)
- ---
,. L -’
^L ; ‘j
PIN NO. 7
-~._~ .r7YzILS’“!!!~L~ - ‘f“” ~~ - I i cz 129 ~--
Connected to GND.
PIN NO. 8
.---L.
SIGNAL
\r\jl
I-
i ,P
I
2
j p.;
AH sensor input.
This input is an anaiog input ierm;nai iron -.he AH sc?nsor sirc,~,:, 3flG ;~Fc~c:& +:
y--q 1 3
y
converter built into the LSI.
‘i’,.. ,c 1 -
t-u__r~-
PIN NO. 9
~___
~~ .__7z!G!!lpIN0 .~ ~~_- ~ _ -T=-- IN
Used for initial balancing of the bridge circuit(absoiu:e humidity sensor): This input !s an anal05 *!~i=,-: rermlnai
from the AH sensor circuit, and connected to the A D converter burit into the LS;
PIN NO. IO-14
1
SIGNAL P47-P43
~__-- __.- -~-~-_.-------~-~
L
i/O
OUT
-~ _ ~~
Used for initial balancing of the bridge circuit(absolute humidity sensor)
PIN NO.
15-l 7
~_____.
Terminal not used.
SIGNAL
P42- P40
110 OUT
__- I
PIN NO. 18
1 SIGNAL P37
1
l/O
OUT
---____
Oven lamp driving siqnal.
To turn on and off shut-off relay( RYI ).
I
20 muc
r
The square waveform voltage is delivered to the ‘- - - -
-+
relay( RYl ) driving circuit and relay (RY2) control circuit.
L-L
PIN NO.
/ 19
1 SIGNAL
P36
I
I/O
OUT
Terminal not used. PIN NO.; 20
1 SIGNAL
P35
Maclnetron high-voltage circuit driving signal.
To turn on and off the cook relay(RY2).
l/O
OUT
I
--
In high operation, the signals holds “L” level during
H’GH ?TT____ microwave cooking and “H” level while not cooking, In other cooking modes (MED HIGH, MED, MED LOW,
LOW) the signal turns to “H” level and “L” level in repe-
MED “l”qLm
tition according to the power level.
ME0
17
Page 20
R-5H53
PIN NO.
/ 35
1 SIGNAL R2
I
I/O
/ IN
Siqnal similar to R3.
When any one of G-10 line keys on key matrix is touched, a corresponding signal will be input into R2.
(RD93CA8U)
PIN NO. 36
1 SIGNAL Rl
I
I/O
I IN
Signal similar to R3.
When any one of G-9 line keys on key matrix is touched, a corresponding signal will be input into RI.
(RD93CABU)
PIN NO. 37
RO
1 SIGNAL
I
I/O
IN
-~-____~
Siqnal similar to R3.
When any one of G-8 line keys on key matrix is touched, a corresponding signal will be input into RO.
(RD93CABUi
PIN NO. 38
__-
______ ~___
VP
~~ 1 SiGNAL
I
l/O
IN
Anode (seqment) of Fiuorescent Display light-up voltaqe: -26V.
Vp voltage of power source circuit input.
(RD93GABlJI
PIN NO. 39-40
Terminal not used.
L
SiGNAL P17-PI6
-_lL!!!LOUT!
PIN NO. 41
SIGNAL PI 5
-__
___-
Seqment data siqnais.
The relationship between signals and indicators are as foilows:
I
I/O
OUT
_____-
Signal Segment
Pl 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
..i. . . . . . . LB
PI 4... . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . UB
P13...
. . . . . . . . . . . . . . . . . . . . . . . . . . . . ~ . . . . . .
k
P12 ..,........................
. . . . . . . . . . ‘ . . . j
PII. . . . . . . . . ..*..............~...I.........L,,
I
,
PI0 . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . .
.I.
h
PO7 . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . .
g
Signai
PC6 . .
. . . . , .
Segment
s..........,.
f
PO5
.... ...........
......................
PO4 ............... ...................
:
PO3
., . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . c
PO2 . ..t........... ~ ./.,....................... b
PO?
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
a
moq 1-i
JxrKI:z.
-2w.
PIN NO. 42 1 SIGNAL
PI4
I
I/O
OUT
Seqment data siqnil.
Signal similar to PI 5.
Key strobe siqnai.
Signal applied to touch-key section. A pulse signal is input to RO-R3 terminal
while one of G-l line keys on key matrix is touched.
(RD939A3U1
PIN NO.
i 43
1 SIGNAL PI3
I
I/O
/ OUT
Seqment data siqnal. Signal similar to PI 5.
(RD939AZUl
PIN NO.
/ 44
Segment data signal.
Signal similar to PI 5.
PIN NO. ; 45
Seqment data signal.
Signal similar to PI 5.
SIGNAL 1 PI2
I
l/O
j OUT
Kev strobe siqnal.
Signal applied to touch-key section. A pulse signal is input to RO-R3 terminal
while one of G-2 line keys on key matrix is touched.
(RD939A3U)
SIGNAL
PI 1
I
l/O
/ OUT
Kev strobe siqnal.
Signal applied to touch-key section. A pulse signal is input to RO-R3 terminal while one of G-3 line keys on kev matrix is touched.
(RD939A3U)
PIN NO.
/ 46
1 SIGNAL
PI0
l/O
/ OUT
Seament data siqnal. Signal similar to PI 5.
I
PIN NO.
/ 47
1 SIGNAL
PO7
Seqment data siqnal.
Kev strobe siqnal.
(RD939AZU)
I
I/O
I OUT
Signal similar to PI 5. Signal applied to touch-key section. A pulse signal is input to RO-R3 terminal
while one of G-4 line keys on key matrix is touched.
(RD939A3U)
19
Page 21
R-5H53
PIN NO, 48
_____
Segment data signal.
Signal similar to PI 5.
PIN NO. 49
SIGNAL : PO6
I
I/O
OUT
Kev strobe signal.
Signal applied to touch-key section. A pulse signal is input to RO-R3 terminal while one of G-5 line keys on key matrix is touched.
(RD939A3U)
1 SIGNAL PO5
I
I/O
j OUT
Segment data signal. Signal similar to PI 5.
(RG939A2U)
PIN NO.
50
1 SIGNAL I PO4
I
I/O
1 OUT
Segment data signal.
Signal similar to PI 5.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to RO-R3 terminal while one of G-6 line keys on key matrix is touched.
(RDS39A3Uj
PIN NO. 51
-___--.-
1 SIGNAL / PO3
1 l/O i OUT
Segment data signal. Kev strobe signal.
Signal similar to PI 5.
Signal applied to touch-key section. A pulse signal is input to RO-R3 terminal while one of G-7 line keys on key matrix is touched.
(RD939A3U)
PIN NO. ’ 52-53 1 SIGNAL 1 PO2-PO1
I
l/O I OUT
Segment data signal. Signal similar to PI 5.
(RD939A2U)
PIN NO. 54
- ---_____
1 SIGNAL ’ PO0
I
i/O
OUT
Diqit selection signal.
The relation between digit signal and digit are as follows:
Digit signal
Digit
P23
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1 st.
334 -_
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2nd.
“25 . . . . . . . . . . ..~.,....~................................,.....,
3rd.
PZE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4th.
2?7
LI
pa?;
. . 1 . . ..t... . . . . . . . . . . . .
5th.
., ,
,.. . . . . . . . . . . . . . . . . . . . . . . . . . .._
6th.
P23
P24 -.-J-L---
P26 n
r<?r-,sii\’
ccle [sti!se
ts output in every 13 period, and
7 7, I-
‘p‘.+ L ‘is one gr~ci oi the Fluorescent Display.
P26 e--km.-
P27 --A!--
i-l
-----* (1)10
DIN NO
55-59
SIGNAL P27- P23
I/O OUT
----- -__
I
Binit selection sianal. Signal similar to PI 5.
C RD938A2U)
PIN NO
60-61
SIGNAL
P22- P21
i/o
OUT
Terminal not used.
___~
I
PIN NO. 62
Connected to GND.
1 SIGNAL P20
I
I/O
/ OUT
PIN NO.
63/64
~____-~
Connected to GND.
SIGNAL
AVCC,‘VSS
I
I/O
1 IN
20
Page 22
R-5H53
ABSOLUTE HUMIDITY SENSOR ClRCUlT
(1) Structure of Absolute Humidity Sensor
The absolute humidity sensor includes two thermistors as shown in the illustration. One thermister is housed in the closed vessel filled with dry air while another is in the open vessel. Each sensor is provided with the protective cover made of metal mesh to be protected from the externai airflow.
SeMmg port Sensing pan
(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 !X 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
itself heated at about 150°C (302°F) and :he re-
sultant heat is dissipated in the air and if the two thermistors are placed in different humidity conai­tions they show different degrees of hea: 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 will be amplified by the operational amplifier.
~~~~~ :‘~er~
Absolute humidity (g/m’ I
(3)Detector Circuite of Absolute Humidity
Sensor
This detector circuit is used to detect the output voltage of the absolute humidity circuit to allow the
LSl to control the sensor cooking of the unit.
When the unit is set in the sensor cooking mode,
16 seconds later the detector circuit starts to func-
tion and the LSI observes the initial voltage avail-
able at its IN1 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 R-l. Changing the resistance values results in that there is the same potential at both F-3 terminal of the absolute humidity sensor and IN0 terminal of the LSI. The voltage of IN1 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 cookmg 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 IN? terminal of the LSi. Then the LSI observes that voltage at IN1 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 unrt gets in the next necessary operation automatically When the LSi starts to derect rhe initial voltage at
tN1 terminal 16 seconds after Ihe gnit has been put
.
in the Sensor
Cooking mode, rf :T ;s tmpossrbie tc
take a baiance of ine bridge c!rcuit due to Qiscon-
nection of the absolute humrdity sensor, ERROR
will reappear on the ciispiay and the cxk:ng is
stopped.
Absolute humidity senscr ‘t--ll?
;‘I btil
vc:-3v
I
SW,
PO&+--& P-/Q2 P452Jj
P44-/
,Tq
21
Page 23
SERVICING
I. 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 aiuminum 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.
1M.Q
2. Shapes of Electronic Components
9
2. Servicing of Touch CantroE Panel
$;‘e describe the procedures to permit servicing of tne touch
control . panel of ?he microwave oven and :ne precautions you must take when doing so. To perform the servicing, power to the touch con­tro! panel is availabie either from the power line of the oven itself or from an external power source.
(‘I) Servicing the touch control panef with
power supply of the oven:
CAUTION:
-l-HE HIGH VOLTAGE TRANSFORMER OF THE MlCRQWAVE OVEN IS STILL LIVE
DURING SERVICING AND 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 be-
tween the touch control panel and the oven it­self is so short that the two can’t be separated.
For those models, check and repair ail 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 be-
tween the touch control panel and the oven
proper is long enough that they may be sepa-
rated 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 properand 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;
r; is alsc possible to check the sensor-related controls of the touch control panel by using the dummy resistor(s).
4, Servicing Toois
Toois
required to service the touch control panel
assem b!y
.’
: \ Sctdering rron: 30W
[II is recommended to use a soidering iron with a
grounding terminal.)
2) Oscitloscope:
Single beam, frequency range: DC - 10Mti.z type or more ad­vanced model.
3: Others:
Hand tools
5. Other Precautions
7) Before turning on the power source of the control unit, remove the aiuminum foil applied for preventing static electricity.
2) Connect the connector of the key unit to the control unit being sure that the lead wires are not twisted.
3) After aiuminum 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 ail connections are tight.
5) Be sure to use specified components where high precision is required.
22
Page 24
R-5H53
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE
WARNING: Avoid possible exposure to microwave energy.
Please follow the instructions below
before ooeratina 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 inter!ock sys­tern.
6. There are defective parts in the microwave generat­ing 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 (Magnerron’f.
Do not operate the oven if any of the following con-
2. if the wave guide or oven cavity are net !nlac:
ditions exist;
3. If the door is not closed.
I. 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 $oilowing removal procedures:
9
;A,pp”,’ ;
HIGH VOLTAGE COMPONENTS REMOVAL
(HIGH VOLTAGE CAPACITOR AND HIGH VOLTAGE RECTIFIER ASSEMBLY!
To remove the comoonents. oroceed as foilows.
::
3.
4.
5.
CARRY OUT & CHECKS.
Remove one (1) screw holding capacitor hoider to
oven unit.
Remove one (I ) screw holding earth side termfnai
of rectifier ass’y and remove capacitor holder.
Disconnect wire leads and terminal of high voltage rectifier assembly from high voltage capacitor. Now, high voltage rectifier assembly can be re­moved.
TRANS. -
MAG. f-
TRANS. -
Shon
protector
i
CAUTION: WHEN REPLACING HIGH VOLTAGE
Sllicon /
Aoctifior
RECTIFIER ASSEMBLY, EARTH SIDE
4
TERMINAL
MUST BE SECURED
FIRMLY WITH A EARTHING SCREW.
1.
2.
3.
4,
1.
2.
3.
MAGNETRON REMOVAL
CARRY OUT 3D CHECKS. Disconnect wire leads from magnetron.
5. First lower the right-hand side of the magnetron through magnetron duct.
Carefully loosen four (4) screws holding magnetron
7. Magnetron is now free.
to waveguide flange while supporting the
magnetron from below.
CAUTION:
WHEN REPLACING THE MAGNETRON,
Lower magnetron until antenna is clear of the
BE SURE THE R.F. GASKET IS IN
waveguide.
PLACE AND MAGNETRON MOUNTING
SCREWS ARE TIGHTENED SECURELY.
TURNTABLE MOTOR REMOVAL
CARRY OUT 3D CHECKS.
Open the door and remove turntable and roller stay. Turn oven unit upside down and remove two (2) screws holding turntable motor cover to bottom side of oven cavity and base cabinet right.
4. Disconnect wire leads from turntable motor.
5. Remove two(2) screws holding turntable motor and pull it out, at this time O-RING attaching with mo-
tor is removed.
23
Page 25
TURNTABLE COUPLING REMOVAL
1. Remove turntable motor, refer to “Turntable Motor Removal”.
2. Remove turntable coupling following in order on illustration.
TURN TABLE
COUPLING
BOTTOM OVEN CAVITY
T.T. MOTOR
ANGLE
‘O-RING
Turntable Coupling
COOLING FAN MOTOR REMOVAL
1. CARRY OUT 3D CHECKS.
2. Remove wire leads from cooling fan duct.
3. Remove two (2) screws and tab on fan duct hold­ing to top oven cavity.
4. Pull fan blade out of cooling fan motor.
5. Remove two (2) screws and two (2) nuts holding fan motor.
6. Now cooling fan motor is free.
CONTROL PANEL ASSEMBLY AND COMPONENTS REMOVAL
The complete control panel should be removed for re-
placement of the components.
To remove the control panel, proceed as follows:
1. CARRY OUT 3D CHECKS.
2. Disconnect (A) and (b) connectors from the control unit.
3. Remove one (1) screw holding the control panel frame to the oven cavity front flange.
4. Lift up the control panel frame to free the panel hooks from the bottom opening of back piate.
5. Pull the control panel forward.
Replacement of individual component is as follows:
CONTROL UNIT AND/OR PANEL FRAME
7. Push the holder of 12-pin connector (D) inward and then pull it
2, Remove the flat cable of key from the 12-pin con-
nector (G) .;
3 Remove the five (5) screws holding the control unit
to the pane! frame.
4. Panei frame and contra! unrt are now free,, separate
them
UPPER LATCH SWITCH AND MONITOR SWITCH REMOVAL
1 CARRY OUT 3D CHECKS. 2 Disconnen- Lo wire leads from switches.
4 Remove upper latch hook from fiange by moving it
downward
3. Remove one (1 > screw holding the upper latch
5. To remove the switch from upper latch hook, push
hook to the oven cavity flange.
outward two i:2j;
retaining tabs holding individual
switch in place.
LOWER LATCH SWITCH, STOP SWfTCH AND LATCH SWITCH REMOVAL
1. CARRY OUT 3D CHECKS.
2. Disconnect wireleads from switches.
4. Remove lower latch hook from flange by moving it downward.
3. Remove one (I) screw holding the lower latch hook to the oven cavity flange.
5. Push outward two (2) retaining tabs holding stop switch in place.
6. Now switches are free.
UPPER/LOWER LATCH SWITCHES, STOP SWITCH AND
MONITOR SWITCH ADJUSTMENT
If the upper and lower latch switches, latch switch, stop switch and monitor switch do not operate prop­erly due to a mis-adjustment, the following adjustment should be made.
1. Loosen the one (1) screw holding the upper latch hook to the oven cavity front flange and the one (1)
screw holding the lower latch hook to the same flange.
2. With door closed, adjust lower latch hook by mov­ing it back and forth and then adjust the upper latch hook by moving it back and forth, or up and down. In and out play of the door allowed by the upper
and lower latch hooks should be less than 0.5 mm. The vertical position of the upper latch hook should
be placed where the upper latch switch and monitor switch have activated with the door closed. Vertical adjustment of the lower latch hook is not possible.
24
Page 26
-
R-5H53
3. Secure the screws with washers firmly.
4. Make sure of the upper latch switch operation. If the upper latch switch has not activated with the door closed, loose one (1) screw holding upper
iatch hook to oven cavity front flange and adjust upper latch hook position.
HOOU
MONITOR SWITCH
UPPER LATCH
After adjustment, make sure of the following:
1. In and out play of door remains less than 0.5 mm when latched position. First check upper latch hook position, pushing and pulling upper portion of door toward the oven face. Then check the lower latch hook position. pushing and pulling lower portion of door toward the oven face. Both results (plays of the door) should be less than 0.5mm.
2. The upper, lower latch and latch switches interruot the circurt before the door can be opened.
3. The monitor switch contacts close and stop switch contacts open when the door is opened.
SWITCH
LCWER LATCH HOOK
STOP
SWITCH LOWER
LATCH
SWITCH (INSIDE ONE) LATCH
WITCH (OUTSIDE ONE)
4. Re-install outer case and check for microwave leakage around the door with an approved micro­wave survey meter. (Refer to Microwave Measure­ment Procedure.;
Figure C-7. Latch Switch Adjustment
DOOR REPLACEMENT AND ADJUSTMENT
DOOR REPLACEi\/lENi
1. CARRY OUT 30 CHECKS.
2. Remove two (2) screws hoidtng lower oven hinge.
3. Remove the lower oven hinge from ihe door,
4. Remove door assembiy from upper oven hmge.
5. On re-installing door, insert the upper oven hinge into the door hinge pin.
6. Insert the lower oven hinge into the door hrnge pin. Then while holding the door in place secure the lower oven hinge firmly with the two (2) mounting screws.
7. Make sure door is parallel with oven face lines (left and upper side lines) and the door latch heads pass
through the latch holes correctly.
Note: After any service to the door; (A) Make sure that the upper latch switch, lower
latch switch and latch switch are operating properly.
4. Re-install outer case ant cneck ior mtc:owa:fe leakage around the door with an approved ,T-I~c:o- wave survey meter.
(Refer to Microwave Measurement Procedure.;
Note: The door on a micro*vvave oven is designee to
act as an electronic seal preventrng the leakage of ;nicrowave energy from the oven cavity during the cook cycle. that
This function does not require
the door be air-tight,
moisture
(condensation)-tight or light-tight. Therefore, the occasional appearance of moisture, light or the sensing of gentle warm air movement around the oven door is not abnormal and do not of themselves, indicate a leakage of microwave en­ergy from the oven cavity. If such were the case, your oven could not be equipped with a vent, the very purpose of which is to exhaust the vapor-laden air from the oven cavity.
(B)
(Refer to chapter “Test Procedures”.). An approved microwave survey meter should be used to assure compliance with proper microwave
radiation
emission limitation
standards.
DOOR ADJUSTMENT
The door can be adjusted by keeping the screws of each hinge loose.
After adjustment, make sure of the following :
1. Door latch heads smoothly catch, the latch hooks through the latch holes, and also the each latch
head goes through the center of the latch hole.
2. Deviation of the door alignment from horizontal line of cavity face plate is to be less than 1 .Omm.
3. The door is positioned with its face depressed to­ward the cavity face plate.
Figure C-2. Door Replacement and Adjustment
25
Page 27
R-5H53
LATCH HEAD REMOVAL AND DOOR DISASSEMBLY
Remove the door assembly, refer to item 1, through 5,
of H Door Replacement”.
1.
2.
3.
4.
5.
6.
Place the door assembly on a soft cloth with facing UP.
lnsert an iron plate (thickness of about 0.5mm) to the gap between the choke cover and the corner portion of door panel as shown figure to free the engaging parts.
Lift up the choke cover.
Now the choke cover is free from the door panel.
Remove the latch spring from the door panel.
Pushing up the latch head, it is now free from door panel.
R
n
FLAT TVCE EcnLw.oaIVEa
.-
IiF
WOlECl l v TAPE
Latch Head Remove and Door Disassembly
.
POSITIVE LOCK@
CONNECTOR (NO-CASE TYPE) REMOVAL
Push the lever of positive lock” connector, Pull down
on the positive lock” connector.
Termicul
CAUTION: WHEN
YOU CONNECTING THE
POSIT-WE LOCK@ CONNECTORS TO THE TERMINALS,
INSTALL THE
POSITWE LOCK@ SO THAT THE LE- VER FACES YOU
Figure C-3. Positive lock @ connector
26
Page 28
R-5H53
MICROWAVE
After adjustment of door latch switches, monitor switch and door are completed individually or collec­tively, 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 bookiet. Important: Survey instruments that comply with the requrre­ment for instrumentations as prescribed by the per-
formance standard for mrcrowave ovens must be
used for testing. Recommended instruments are: NARDA 8100 NAR DA 8200 HOLADAY HI 1500
SIMPSON 380M
2. Place the oven tray into the oven cavity.
3. Place the load of 275&l 5ml of swater initially at 20+ 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
.
MEASUREMENT
an electrically non-conductive 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. 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. Move the probe slowly (not faster that 2.5cm/sec.)
along the gap. The microwave radiation emission should be meas­ured at any point of 5cm or more from the external surface of the oven.
Microwave leakage measurement at 5 cm dis-
tance
(RDEii’3EU)
27
Page 29
R-5H53
____
---___
_.------- --
SCEMATIC
NOTE: CONDITION OF OVEN
1. DOOR CLOSED.
2 CLOCK APPEARS ON DISPLAY.
l-
AH SENSOR
- -1
3 ‘,,i
Id
I
Jl
iJ:j
I
---
w
L.-i
8 I4 ?
+-sj
o-
E=
$
rii
r%
ZE
Figure O-1. Oven Schematic-OFF Condition
SCEMATIC NOTE, CONDITION OF C)VEN 1 DOOR CLOSED 2 COgKiNG TIIME PROGRAMMED 3 VARlABLE COOKING CONTROL “hIGH” i START
%I2 ‘O’JCHIED
SCEMATIC
NOTE: CONDITION OF OVEN
1. DOOR CLOSED. ?
“FRESH” OR “FROZEN” PAD TOUCHED 5 DESIRED SENSOR SETTING NO TOUCHED 4 START PAD TOLlCHED
_____ --
I L
$-+
0 aa i-0 IzL
g 2E
r---
r-1 I
L.3
i----J
8
84
z!
Figure O-2. Oven Schematic-Cooking or Sensor Cooking Condition
28
Page 30
I
I
c)
I
n
I
m
0 0
m
--_____
---
_---------.- .-... - .-- --. I
I b
.- _____
CN-E
II
AH sensor assembly
55
MAIN Touch control unit
CN-E
0
FAN MOTOR
r---j BLK [
7
1
4
MONITOR SWITCH
UPPER
1
I
/
FUSE MBA 6 FUSE HOLDER
0
BLU j--+
CN-
WHT j--
1/
-----d
H.V.C.
WHT )--
-
WHT k
-
I--
II ----
-
4
CAB SIDE
-
- RED
CN-A
-EEI--
-
-
,
1
-
I-
q UUO~ 1 3 !i 7
1
E4
@I
OVEN THERMAL
::MP
---f PNK
CUT-OUT
FUSE
NO
GRN )--
t
OVEN CAVITY SIc)E
-a
- COM
Y
STOP
E
SWITCH
I
2
+
‘%
t
I
t
IU
-------- .-- -----_ __ _
CN-B
CAHTEII- 1
-
I
I
lH.V.RECTIFIER
~~ -~
P4~t.e l.@is Positive lock*connector.
T1.YELLOW lead wire may be Pink.
a
Figure S-l. Pictorial Diagram
-. I
--
---
0
- ---- -.--. -_ .- _I .__
.-
n
m
0 I
----- ---- -------.-.---
C) m
---Y-u YI**-“l.““” 1 LI1”-yyIIY”
b
-II_-
L 1
Page 31
R-5H53
I I ,% I
I I
: i-.i
5
g$
I
L
>
;p g
::
%
1
I
*fZ
1 1 WV 1 “‘I 1
.”
SO
‘W
~
s
t- 0
dp”‘“F2
j IJ
*SE,dOOOl 13
*
?i gi
65, Zi
;I -
h
i ---i
1
2
3 4 5
6
30
Page 32
1
2
3
4
5
6
Cll
Figure S-3. Printed Wiring Board
I
1
I 2 3
I
I
4
I
5
6
31
Page 33
MH53
PARTS LIST
Note : The voltage supplied to the parts n*r are greater than 25OV.
REF. NO. 1 PART NO.
DESCRIPTION
1 O’TY ICODE
ELECTRICAL PARTS
* * * *
l- 1
QACCAA018WREO Power supply cord
1
AQ
;I ;
QFS-CAOlOWREO Fuse M8A
AE
QFSHDA002WREO Fuse holder
i AE
l- 4 QFS-TAOlOWREO Temperature fuse 115°C
1 AG
I.- 5 QSOCLAOOlWREO Oven lamp socket
1
AK
l- 6 QSW-MA007WREO Upper lower latch switches, stop switch
3 AE
(V-5230D-069)
l- 7 RLMPTA029WREO Oven lamp
AK
l- 8
QSW-MAOO9WREO Monitor switch (V-5220D-070)
i AE
l- 9 RMOTEA162WREO Cooling fan motor
1
AW
l-10 RMOTDA055WREO Turntable motor
AR
l-11 RTRN-A246WREO Power transformer
:. BM
l-12
RC-QZA075WREO High voltage capacitor
AU
l-13 FH-DZA005WREO High voltage rectifier ass'y
i AP
l-14
RV-MZA089WREO Magnetron
1 BG
l-16 RTHM-A015WREO Thermal cut-out
115°C
1 AF
l-17
RR-WZA003WREO Monitor resistor 0.8n 20W
AF
1-18
FDTCTA123WRKO AH sensor assembly
t AY
CABINET PARTS
;I ;
GCABUA260WRPO Outer case cabinet
BA
GDAI-A138WRWO Base plate (Right)
i AP
-4
z- 5
LANGK0243WRPO Capacitor holder GLEGP0021WREO Foot
2'
AC AB
2- 6
LSTPP0065WRFO Cord anchorage (Upper)
1 AA
2- 7
LSTPP0066WRFO Cord anchorage (Lower)
AA
2- 8 LANGQ0382WRMO Earth angle
t AB
2- 9 PCUSGAlGOWREO Vibration proof cushion
1 AD
2-10
PCUSGA24OWRPO Vibration cushion
1
AD
CONTROL PANEL PARTS
3- 1 CPWBFA470WRKO Control unit (Not Replaceble Item)
1
3- 1A QCNCMA23ODREO 4-pin connector (A)
BQ
3- 1B QCNCMA275DREO 2-pin connector (B) 3- 1c
QCNCMA145DREO 3-pin connector (F)
3- 1D
QCNCWA030DREO 12-pin connector (G)
3- 1E RV-KXA009DREO Fluorescent display tube
Cl
RC-KZA087DREO Capacitor
O.lvF 50V
c2
VCEAB31VW108M Capacitor
1OOOpF 35V
c3 VCEAB31EW476M Capacitor
47pF 25V
c4
VCKYBllEX153N Capacitor
0.015pF 25V
c5
VCEAB31CW476M Capacitor
47pF 16V
C6,7,20,VCKYDllCY103N Capacitor
O.OlpF 16V
C60
C8
RC-KZA031DREO Capacitor
O.lpF 25V
c21 VCTYF31HF103Z Capacitor
O.OlpF 50V
C80
VCEAB31HW474M Capacitor
0.47pF 50V
C81 VCEAB31HW335M Capacitor
3.3pF 50V CFl RCRS-AOlODREO Ceramic resonator CST4.00MGW Dl-5
VHDlSR139-11B Diode (lSR139)
D60-61, VHDlSS270A/-1Diode (lSS270A)
D81-82, D84-85, D91-97
ICl
RH-IZA393DREO LSI
IC2
RH-IZA31ODREO IC
g:o,40
VS2SB793///-4 Transistor (2SB793) VSDTA143ES/lB Transistor (DTA143ES)
Q30
RH-TZA063DREO Transistor (2SA933S)
AC t AB 1
AB 1 AE
AW t AA 1 AF
AA i AA
AA ii AA
1 AA 1AA
AA t AA
AD 5' AA
13 AA
1 AV 1 AL
AC
2' AA 1 AB
32
-
Page 34
R-5H53
Vote :
The voltage supplied to the parts rr*n are greater than 250V.
REF. NO. 1 PART NO.
I
DESCRIPTION Q’T’
-
t
i
3
Y c
:ODE
AB AC AC AA AA
Q80 Q81
z2
R2,5,85
VSDTA114YS/-3 Transistor
VSDTD143ES/-3 Transistor
RH-TZA097DREO Transistor VRD-B12EF432J Resistor VRD-B12EF102J Resistor
VRD-B12HF621J Resistor
VRD-B12HF751J Resistor
VRD-B12EF153J Resistor
VRD-B12EF332J Resistor
(DTA114YS) (DTD143ES) (DTB143ES)
4.3kn 1/4W lkn 1/4W
62022 1/2W 75ofl 1/2w 15kfl 1/4W
3.3kn 1/4w
1
AA AA AA AA
R3 R4 R6,20 R40,
R91-97
RlOO-10 R51 R60
R61
R62
VRS-B13AA331J VRD-B12EF512J VRD-B12EF103J VRD-B12EFlOlJ
AA AA AA AA
Resistor 33of2 1w Resistor 5.lkn 1/4w Resistor
lOk0 1/4W
Resistor loon 1/4w Resistor 2OOQ 1/4w
Resistor
18D 1/4W
Resistor l.OMf-l 1/4W Relay (OJ-SH-112LM) Relay (VS14MB)
Buzzer (PKM22EPT-CA THAI) Transformer
Varistor (TNR15G471K)
Zener diode (HZ6A-3) Zener diode (HZ16-1)
i
1 1
1
i
i 1
i
i 1
1
:: 1
5
-
1 1
:: 1
AA AA AA AH AK
R81 VRD-B12EF201J R82
VRD-B12EF180J
R200
VRD-B12EF105J RYl RRLY-AO20DREC RY2 RRLY-A059DREC
SP40 RALM-A007DREC Tl RTRNPA067DREC VRSl RH-VZAOlODREO ZDl
VHEHZGA3///-1 ZD2 VHEHZlGl///-1
AF AR AE AC AA
AA AK AX AD AA
ZD3 RH-EZA105DREO Zener diode (RD4.3ESB2)
3-
2 HPNLCA901WRFO
Control panel frame
3-
3 DUNTKA491WRKO
Key unit assembly
3-
4 JBTN-A710WRFO
Open button
3-
5 MSPRDA003WREO
Open button spring
3-
6 XEPSD30PlOXSO
Screw;Control unit mounting
OVEN PARTS
AA
BN AN AV AF AA
AC AB AD AD AD
AD AA AM AH AH
AE AA AE AM AK
AB
AA AB AB AD
AA
4- 1 4- 2 4- 3 4- 4 4- 5
DOVN-A171WRTO Oven cavity FROLPA036WRKO Roller stay NTNT-AOOlWRFO Turntable tray PCOVP0279WREO Waveguide cover PCLICQOOlYBEO Clip
NCPL-A015WRFO Turntable coupling PPACGA017WREO O-ring MHNG-A121WRMO Oven hinge (upper) PHOK-A032WRFO Upper latch hook PHOK-A033WRFO Lower latch hook
4- 6 4- 7 4- 8 4- 9 4-10
t
1 1 1
1
t 1 1
i
; 1
4-11 4-12 4-13 4-14 4-15
MLEVPA096WRFO Door open lever MSPRTOlOOWREO Button spring FDUC-A154WRYO Steam duct PDUC-A474WRFO Fan duct PDUC-A473WRFO Magnetron duct
FFANJ0031WRKO Fan blade assv LSTY-0030WRE0 Fan retainer ­PCOVPA130WRPO Turntable motor cover FDAI-AO61WRKO Base plate (left) assy GDAI-A088WRWO Base plate (left)
GLEGP0021WREO Foot PCUSGA154WRPO Cushion GFTARAOOlWRWO Oven lamp access cover PFILWA027WRPO Oven lamp filter
MHNG-A122WRMO Oven hinge (lower)
4-16 4-16A 4-17 4-18 4-18A
4-18B 4-19 4-20 4-21 4-22
I I
2
4-23
PCUSGAOGlWRPO Leader cushion
DOOR PARTS
CDORFA524WRKO Door assembly, complete. DDORFA442WRYO Door panel FCOVAA049WRKO Door screen assembly GCOVHA241WRFO Choke cover FANGKA068WRYO Latch angle
1 BP 1 BB
BB
i AH 1 AL
:- 1 5- 2 5- 3 5- 4
33
Page 35
R-5H53
Note : The voltage supplied to the parts “*1 are greater than 250V.
REF. NO.
5- 5 5- 6
;I ; 5- 9
PART NO. DESCRIPTION
LSTPPA097WRFO Upper latch head LSTPPA098WRFO Lower latch head MLEVFA008WRPO Latch lever MLEVPA178WRFO Head lever MSPRT0059WREO Latch sprint
GWAKPA132WREO Door frame
$C! ; PSHE-A022WREO Door panel sheet (L) PSHE-A023WREO Door panel sheet (S)
S-10 5-11 5-12
* *
6- 1 6- 2 6- 3 6- 4 6- 5
6- 6 6- 7 6- 8 6- 9
7- 1
2
;I 3
4
;I 5 7- 6
7- 7 7- 8 7- 9 7- 10
7- 11 7- 12 7- 13 7- 14 I- 15
7- 16 7- 17 7- 18 7- 19 7- 20
MISCELLANEOUS
QW-QZA066WREO High voltage wire A QW-QZA067WREO High voltage wire B TCADCA226WRRO Cook book FW-VZA770WREO Main wire harness TINSEA557WRRO Operation manual
TSPCNB586WRRO Name plate TCAUHAO95WRRO Caution label FW-VZB113WREO Stop switch harness QTANN0033WREO cord connector
SCREW, NUT AND WASHER
LX-CZA020WREO Special screw LX-EZA042WREO Special screw XOTSD40P12000 Screw; M4 x 12 LX-EZA004WREO Special screw LX-BZ0174WREO Special screw
XFPSD30P14000 Screw;
M3 x 14 zinc plated steel
XFPSD40PlOOOO Screw;
M4 x 10 zinc plated steel
XHTSD40P08RVO Screw; M4 x
8 zinc plated steel XFPSD40PlOKOO Screw; M4 x 10 zinc plated steel XNESD40-32000 Nut;
M4 x 3.2 zinc plated screw
XHPSD40P08KOO Screw; m4 x
8 zinc plated steel XWWSDSO-06000 Washer;
MS x 0.6 zinc plated steel LX-BZA036WREO Special screw XOTSD40P12RVO Screw;
M4 x 12 zinc plated steel
XBPSD40P25000 Screw; M4 x 25 zinc plated steel XHPSD30PlOXOO Screw;
M3 x 10 zinc plated steel
XHPSD40P22000 Screw;
M4 x 22 zinc plated steel LX-BZA064WREO Special screw XFPSD30PlOOOO Screw: M3 x 10 zinc plated steel XFPSD30P08000 Screw; M8 x
8 zinc plated steel
HOW TO ORDER REPLACEMENT PARTS
4 2
z 1
1
2
; 3
41
z 1
1 5 1 2
AA AB AA AA AA
AA AA AA AA AA
AA AA AA AA AA
AA AA AA AA AA
To have your order filled promptly and correctly, please furnish the following information.
1. MODEL NUMBER
2. REF. NO.
3. PART NO. 4. DESCRIPTION
(RDP1303Ll)
\
34
Page 36
R-5H53
1 I 2 3 4
5 6
’ OVEN PARTS
/
1
2
3
4
/
5
6
35
Page 37
R-5H53
I
B
I
I
i
,
cl
/
I
D
E
F
G
H
i
1
2
3
4
5
6
__--__
-
CABINET PARTS
1
/
2
3
-
4
5
6
36
Page 38
R-5H53
1
/
2
I
3 I 4 5 6
/ CONTR
. I
OL PANEL PARTS
C
0
3-4
,-----
-.
DOOR ASSEMBLY
/
\
/
\
/
/
/
/H
/
\ /--
/
1 /
I
2
/ 3 4
/
5 6
37
Page 39
R-5H53
MISCELLANEOUS
P
(Capacitor)
I Capacitor) (Transformerj
l Actual wire harness may be different than illustration.
PACKING AND ACCESSORIES
l TRAY HOLDER
(SPADFA075WRE
---- .---___I_
jH.RAY PACKING FORM i 1
(SPADPAi 28WREO) ’
l Not replaceable items
‘91 0 SHARP CORP. (9k0.55E) Printed in Australia
38
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