Sharp R-33ST Service Manual ▷ View online
SHARP CORPORATION
SERVICE MANUAL
In interests of user-safety the oven should be restored to its original
condition and only parts identical to those specified should be used.
condition and only parts identical to those specified should be used.
MICROWAVE OVEN
TABLE OF CONTENTS
Page
CAUTION MICROWAVE RADIATION........................................................................INSIDE COVER PAGE
SERVICING/WARNING ............................................................................................................................... 1
CAUTION/WARNING/PRODUCT DESCRIPTION ...................................................................................... 2
APPEARANCE VIEW .................................................................................................................................. 3
OPERATION DATA ..................................................................................................................................... 4
FUNCTION OF IMPORTANT COMPONENTS ........................................................................................... 5
WIRING/REWIRING .................................................................................................................................... 5
TEST PROCEDURES ................................................................................................................................. 6
DESCRIPTION OF LSI .............................................................................................................................. 10
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ...................................................... 14
MICROWAVE MEASUREMENT ............................................................................................................... 16
SCHEMATIC DIAGRAM ............................................................................................................................ 17
CONTROL PANEL DIAGRAM ................................................................................................................... 18
PRINTED WIRING BOARD DIAGRAM ..................................................................................................... 19
PARTS LIST .............................................................................................................................................. 20
EXPLODED VIEW OF OVEN .................................................................................................................... 22
CONTROL PANEL PARTS/DOOR PARTS ............................................................................................... 23
MISCELLANEOUS / PACKING / ACCESSORIES .................................................................................... 24
SERVICING/WARNING ............................................................................................................................... 1
CAUTION/WARNING/PRODUCT DESCRIPTION ...................................................................................... 2
APPEARANCE VIEW .................................................................................................................................. 3
OPERATION DATA ..................................................................................................................................... 4
FUNCTION OF IMPORTANT COMPONENTS ........................................................................................... 5
WIRING/REWIRING .................................................................................................................................... 5
TEST PROCEDURES ................................................................................................................................. 6
DESCRIPTION OF LSI .............................................................................................................................. 10
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ...................................................... 14
MICROWAVE MEASUREMENT ............................................................................................................... 16
SCHEMATIC DIAGRAM ............................................................................................................................ 17
CONTROL PANEL DIAGRAM ................................................................................................................... 18
PRINTED WIRING BOARD DIAGRAM ..................................................................................................... 19
PARTS LIST .............................................................................................................................................. 20
EXPLODED VIEW OF OVEN .................................................................................................................... 22
CONTROL PANEL PARTS/DOOR PARTS ............................................................................................... 23
MISCELLANEOUS / PACKING / ACCESSORIES .................................................................................... 24
R
R-33ST
S04274R33SEHW
MODELS
10
10
1
MIN
MIN
KG
S
STOP
WATT
1
min
R-33ST
AUTO
COOK
COOK
DEFROST
COOK
CAUTION
MICROWAVE RADIATION
Personnel should not be exposed to the mircowave energy which may radiate from the magnetron or
other microwave generating devices if it is improperly used or connected. All input and output micro-
wave connections, waveguides, flanges and gaskets must be secured. Never operate the device with-
out a microwave energy absorbing load attached.
Never look into an open waveguide or antenna while the device is energised.
other microwave generating devices if it is improperly used or connected. All input and output micro-
wave connections, waveguides, flanges and gaskets must be secured. Never operate the device with-
out a microwave energy absorbing load attached.
Never look into an open waveguide or antenna while the device is energised.
VARNING
MIKROVAGSSTRALING
Personal får inte utsättas för mikrovågsenergi som kan utstrala från magnetronen eller andre
mikrovågsalstrande anordningar om dessa är felanslutna eller används på fel sätt. Alla in-och
utgångsanslutningar för mikrovågor, vagledare, flänsar och packningar måste vara fast anslutna.
Mikrovågsgeneratorn får inte arbeta utan att absorberande belastning är ansluten. Titta aldrig in i en
öppen vågledare eller antenn när mikrovågsgeneratorn är påkopplad eller laddad.
mikrovågsalstrande anordningar om dessa är felanslutna eller används på fel sätt. Alla in-och
utgångsanslutningar för mikrovågor, vagledare, flänsar och packningar måste vara fast anslutna.
Mikrovågsgeneratorn får inte arbeta utan att absorberande belastning är ansluten. Titta aldrig in i en
öppen vågledare eller antenn när mikrovågsgeneratorn är påkopplad eller laddad.
VAROITUS
MIKROAALTOSATEILYA
Käyttäjä ei saa joutua alttiiksi mikroaaltoenergialle, jota voi säteillä magnetronista tai muusta
mikroaaltoja kehittävästä laitteesta, jos sitä käytetään väärin tai jos se kytketään väärin. Kaikkien
mikroaaltoliitäntöjen sekä syöttö-että ulostulopuolella, aaltoputkien laippojen ja tiivisteiden tulee olla
varmistettuja.
Mikroaaltouunia ei koskaan saa käyttää ilman kuormaa jossa mikroaaltoenergiaa kuluu. Avoimeen
aaltoputkeen tai antenniin ei koskaan saa katsoa virran ollessa kytkettynä.
mikroaaltoja kehittävästä laitteesta, jos sitä käytetään väärin tai jos se kytketään väärin. Kaikkien
mikroaaltoliitäntöjen sekä syöttö-että ulostulopuolella, aaltoputkien laippojen ja tiivisteiden tulee olla
varmistettuja.
Mikroaaltouunia ei koskaan saa käyttää ilman kuormaa jossa mikroaaltoenergiaa kuluu. Avoimeen
aaltoputkeen tai antenniin ei koskaan saa katsoa virran ollessa kytkettynä.
ADVARSEL
MIKRØBOLGESTRÅLING
Personell må ikke utsettes for mikrobølge-energi som kan utstråles fra magnetronen eller andre
mikrobølge-generende deler dersom apparatet feilbetjenes eller blir feiltikoplet. Alle inn-og ut-
tilkoplinger i forbindelse med mikrobølge-strålingen, bølgeledere, flenser og tetningsringer/pakninger må
festes ordentlig.
Aldri bruk apparatet med mindre en mikrobålge-absorberende last er plassert i ovnsrommet. Aldri se
direkte inn i en åpen bølgeleder eller antenne imens apparatet er strømførende.
mikrobølge-generende deler dersom apparatet feilbetjenes eller blir feiltikoplet. Alle inn-og ut-
tilkoplinger i forbindelse med mikrobølge-strålingen, bølgeledere, flenser og tetningsringer/pakninger må
festes ordentlig.
Aldri bruk apparatet med mindre en mikrobålge-absorberende last er plassert i ovnsrommet. Aldri se
direkte inn i en åpen bølgeleder eller antenne imens apparatet er strømførende.
ADVARSEL
MIKRØBOLGEBESTRALING
Man bør ikke udsætte sig for mikrobølgebestråling fra magnetronen eller andre
mikrobølgefrembringende anordninger, hvilket kan ske hvis apparatet er forkert tilsluttet eller bruges
forkert. Alle mikrobølgeindgange og-udgange, bølgeledere, flanger og tætningsstrimler må være
forsvarligt udført.
Anvend aldrig ovnen uden en mikrobølgeabsorberende anordning. Se aldrig ind i en åben bølgeleder
eller antenne, mens ovnen er i brug.
mikrobølgefrembringende anordninger, hvilket kan ske hvis apparatet er forkert tilsluttet eller bruges
forkert. Alle mikrobølgeindgange og-udgange, bølgeledere, flanger og tætningsstrimler må være
forsvarligt udført.
Anvend aldrig ovnen uden en mikrobølgeabsorberende anordning. Se aldrig ind i en åben bølgeleder
eller antenne, mens ovnen er i brug.
R33ST - 1
High voltage capacitor, High voltage transformer, Magnetron, High voltage rectifier assembly, High voltage
harness.
harness.
REMEMBER TO CHECK 3D
1)
D
isconnect the supply.
2)
D
oor opened, and wedged open.
3)
D
ischarge 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 using a screwdriver with an insulated handle.
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 using a screwdriver with an insulated handle.
Microwave ovens should not be used without a load. 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 one (1) minute, set the
power level to HIGH (100%) and push the start key. When the one (1) minute has elapsed (timer at zero) carefully check
that the water is now hot.
place a cup of cold water on the oven turntable, close the door and set the microwave timer for one (1) minute, set the
power level to HIGH (100%) and push the start key. When the one (1) minute has elapsed (timer at zero) carefully check
that the water is now hot.
AFTER REPAIR REMEMBER TO CHECK 4R
1)
R
econnect all leads removed from components during testing.
2)
R
eplace the outer case (cabinet).
3)
R
econnect the supply.
4)
R
un the oven. Check all functions.
When all service work is completed, and the oven is fully assembled, the microwave power output should be checked
and microwave leakage test carried out.
and microwave leakage test carried out.
IMPORTANT:
If the oven becomes inoperative because of a blown fuse F1 in the 1st latch switch - monitor switch
circuit, check the 1st latch switch and monitor switch before replacing the fuse F1.
circuit, check the 1st latch switch and monitor switch before replacing the fuse F1.
Sharp recommend that wherever possible, fault-finding is carried out with the supply disconnected. In some
cases, it may be necessary to connect the supply with the cover removed to carry out fault investigation in the
control circuitry. In such cases, the high voltage circuit should be disabled as described below to reduce the
hazards:-
cases, it may be necessary to connect the supply with the cover removed to carry out fault investigation in the
control circuitry. In such cases, the high voltage circuit should be disabled as described below to reduce the
hazards:-
•
Carry out 3D checks (see above).
•
Disconnect the supply leads from the high voltage transformer, making a note of the polarity. Insulate the
connectors, ensuring they are positioned away from the transformer and fastened there.
connectors, ensuring they are positioned away from the transformer and fastened there.
•
Connect any relevant test equipment e.g. voltmeter.
•
Reconnect the oven to the supply, then close the door.
•
Note the results of the test, taking care to keep clear of the operational oven.
•
Carry out 3D checks (see above).
•
Reconnect the leads to the transformer. Take care to observe correct polarity.
•
Carry out 4R checks (see below).
WARNING TO SERVICE PERSONNEL
Microwave ovens contain circuitry capable of producing very high voltage and current. Contact with following parts
will result in electrocution:-
will result in electrocution:-
SERVICING
R33ST - 2
WARNING
Servicing and repair work must be carried out only by
trained service engineers.
trained service engineers.
The parts marked '*' on the parts list and schematic
diagram have voltages in excess of 250V.
diagram have voltages in excess of 250V.
Removal of the outer wrap gives access to potential
above 250V.
above 250V.
All the parts marked "
∆
" on the parts list may cause undue
microwave exposure, by themselves, or when they are
damaged, loosened or removed.
damaged, loosened or removed.
CAUTION
MICROWAVE RADIATION
Do not become exposed to radiation from the
magnetron or other parts conducting microwave
energy. All input and output microwave
connections, waveguides, flanges and gaskets must
be secured. Never operate the device without a
microwave energy absorbing load attached. Never
look into an open waveguide or antenna while the
device is energized.
magnetron or other parts conducting microwave
energy. All input and output microwave
connections, waveguides, flanges and gaskets must
be secured. Never operate the device without a
microwave energy absorbing load attached. Never
look into an open waveguide or antenna while the
device is energized.
WARNING
THIS APPLIANCE MUST BE EARTHED
.
THE WIRES IN THIS MAINS LEAD ARE COLOURED IN
ACCORDANCE WITH THE FOLLOWING CODE:
GREEN-AND-YELLOW : EARTH BLUE : NEUTRAL BROWN : LIVE
GREEN-AND-YELLOW : EARTH BLUE : NEUTRAL BROWN : LIVE
If the mains lead is replaced, only part number QACCVAD54WRE4 should be used
SPECIFICATION
Power Requirements
230 Volts 50 Hertz Single phase, 3 wire earthed
Power Consumption
1.45kW
Power Output
900 watts nominal of RF microwave energy
Operating frequency of 2450 MHz
Operating frequency of 2450 MHz
Case Dimensions
Width 520 mm Height 305 mm including foot Depth 413 mm
Cooking Cavity Dimensions
Width 342 mm Height 207 mm Depth 368 mm
Turntable diameter
325 mm
Control Complement
Simple Touch Control System
Clock (1.00 - 12.59 or 0.00 - 23.59)
Microwave Power for Variable Cooking
Repetition Rate:
Clock (1.00 - 12.59 or 0.00 - 23.59)
Microwave Power for Variable Cooking
Repetition Rate:
HIGH
Full power throughout the cooking time
MEDIUM HIGH
approx. 70% of FULL Power
MEDIUM
approx. 50% of FULL Power
MEDIUM LOW
approx. 30% of FULL Power
LOW
approx. 10% of FULL Power
EXPRESS COOK keys
TIMER key
EXPRESS DEFROST keys
POWER LEVEL key
AUTO COOK key
TIME keys
LESS/MORE keys
STOP key
CLOCK key
WEIGHT DECREASE/INCREASE key
Set Weight
Approx. 17 kg
+1MIN/START key
PRODUCT DESCRIPTION
CAUTION / WARNING
As part of our policy of continuous improvement, we reserve the
right to alter design and specifications without notice
right to alter design and specifications without notice
