How it Works
Sharp
Loading...
R5L16EHW
Schematic
32 pgs416.23 Kb0

Sharp R5L16EHW Schematic

SERVICE MANU AL
S3401R5L16EHW
MICROWAVE OVEN
R-5L16
MODEL
In interests of user-safety the oven should be restored to its original condition and only parts identical to those specified should be used.
TABLE OF CONTENTS
CAUTION, MICROWAVE RADIATION....................................................................................................... 1
WARNING....................................................................................................................................................1
PRODUCT SPECIFICATIONS ................................................................................................................... 2
GENERAL IMPORTANT INFORMATION ...................................................................................................2
APPEARANCE VIEW ................................................................................................................................. 3
TEST PROCEDURE................................................................................................................................... 9
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE..................................................... 15
MICROWAVE MEASUREMENT .............................................................................................................. 20
TEST DATA AT A GLANCE ..................................................................................................................... 21
WIRING DIAGRAM................................................................................................................................... 22
PICTORIAL DIAGRAM ............................................................................................................................. 23
PARTS LIST ............................................................................................................................................. 24
R-5L16
Page
SHARP CORPORATION
R-5L16
CAUTION
MICROWAVE RADIATION
Personnel should not be exposed to the microwave energy which may radiate from the magnetron or other microwave generating devices if it is improperly used or connected. All input and output microwave connections, waveguides, 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.
VARNING
MICKROVAGSSTRALING
Personal får inte utsättas för mikrovågsenergi som kan ustrala 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 ën öppen vågledare eller antenn när mikrovågsgeneratorn är påkopplad eller laddad.
VAROITUS
MIKROAALTOSÄTELYÄ
Käyttäjä ei saa joutua alttiiksi mikroaaltoenergialle, jota voi säteillä magnetronista tai muusta mikroaaltoja kehittävästä laitteesta, jos sitä käytetään tai jos se kytketään väärin. Kaikkien mikroaaltoliitäntöjen sekä syöttö-että ulostulopuolella, aaltoputkien laippojen ja tiivisteiden tulee olla varmistettuja. Mikroaaltouunnia ei koskaan saa käyttää ilman kuormaa jossa mikroaaltoenergiaa kuluu. Avoimeen aaltoputkeen tai antenniin ei koskaan saa katsoa virran ollessa kytkettynä.
ADVARSEL
MIKROBØLGESTRÅLING
Personell må ikke utsettes for mikrobølge-energi som kan utståles 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.
ADVARSEL
MIKROBØLGEBESTRÄLING
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 mikrobølgesabsorberende anordning. Se aldrig ind i en åben bølgeleder eller antenne, mens ovnen er i brug.
SERVICE MANUAL
R-5L16
MICROWAVE OVEN
R5L16
GENERAL IMPORTANT INFORMATION
This Manual has been prepared to provide Sharp Corp. Service engineers with Operation and Service Information.
It is recommended that service engineers carefully study the entire text of this manual, so they will be qualified to render satisfactory customer service.
WARNING
Note: The parts marked "*" are used in voltage more than 250V.
(Parts List) All the parts marked "∆" on the parts list may cause undue
microwave exposure, by themselves, or when they are damaged, loosened or removed.
Anm: Delar märket med "*" har en spänning överstigande
250V. Alla reservdelar som är märkta med "∆" i reservdelslistan
kan förorsaka omåtting mikrovågsstrålning, antingen i sig själva, eller när de har blivit skadade, lösa eller.
Huom: Huolto-ohjeeseen merkitty "tähdella" osat joissa jännite
on yli 250 V. Kaikki varaosaluettelossa ∆:lla merkityt osat voivat
aiheuttaa asiaankuulumatonta mikroaaltosäteilyä; joko sinällään, tai kun ne ovat rikki, löystyneet tai irroitettu.
Bemerk: Deler som er merket "asterisk" er utsatt for spenninger
over 250V til jord. Alle delene som er merkt med "∆" på del-listen kan
forårsake utstrakt mikrobølgestråling, og denne faren øker når de er skadet, løsner eller fjernes.
Bemærk: "Dele mærket med stjerne benyttes med højere spænding
end 250 volt. Alle delene mærket "∆" på delbetegnelsen på medføre udsættelse for mikrobølger, af sig selv eller når de bliver beskadigede, løsnede eller fjernet.
PRODUCT SPECIFICATIONS
GENERAL INFORMATION
APPEARANCE VIEW
OPERATING SEQUENCE
FUNCTION OF IMPORTANT COMPONENTS
SERVICING AND TROUBLESHOOTING CHART
TEST PROCEDURE
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE
MICROWAVE MEASUREMENT
WARNING
Never operate the oven until the following points are ensured. (A) The door is tightly closed. (B) The door brackets and hinges are not defective. (C) The door packing is not damaged. (D) The door is not deformed or warped. (E) There is not any other visible damage with the oven.
Servicing and repair work must be carried out only by trained service engineers.
SHARP CORPORATION
OSAKA, JAPAN
1
TEST DATA AT A GLANCE
WIRING DIAGRAM
PARTS LIST
R-5L16
PRODUCT DESCRIPTION
SPECIFICATION
ITEM DESCRIPTION
Power Requirements 220-230 Volts
50 Hertz
Single phase, 3 wire earthed Power Consumption 1750 W Approx. 8 A Power Output 1000 W nominal of RF microwave energy (measured by method of IEC 705)
Operating fequency 2450 MHz Case Dimensions Width 520 mm
Height 305 mm including foot
Depth 413 mm Cooking Cavity Dimensions Width 342 mm
Height 193 mm
Depth 368 mm Turntable diameter 325mm Control Complement 30 min. Single-speed timer
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
Set Weight (Approx.) Approx. 17.0 kg
GENERAL INFORMATION
WARNING
THIS APPLIANCE MUST BE EARTHED
IMPORTANT
THE WIRES IN THIS MAINS LEAD ARE COLOURED IN ACCORDANCE WITH THE FOLLOWING CODE:
GREEN-AND-YELLOW : EARTH BLUE : NEUTRAL BROWN : LIVE
2
APPEARANCE VIEW
R-5L16
OVEN
Door Door hinges
Oven lamp
Waveguide cover
Control panel
Coupling
1. Place the roller stay on the floor of the oven cavity.
2. Then place the turntable on it fitting
Door lock opening
to the coupling.
Oven cavity
Door seals and sealing surfaces Safety door latches
Oven lamp access cover Ventilation openings
Turntable
Roller Stay
Coupling
CONTROL PANEL
30
25
Outer cabinet Rear cabinet
Spacer
Power supply cord
START BUTTON
MICROWAVE POWER CONTROL
5
TIMER (0 - 30 mim)
10
15
20
DOOR OPEN BUTTON
3
R-5L16
OPERATION SEQUENCE
OFF CONDITION
1. When the timer knob is at " • ", the oven is OFF condition.
2. Closing the oven door activates the primary latch switch SW1, the 2nd latch switch SW2, and the 3rd latch switch SW3.
IMPORTANT: When the oven door is closed, the contacts
monitor switch
SW5 must be open.
COM-NC of the
Figure O-1 on page 22
3. When the microwave oven is plugged in a wall outlet (220-230V, 50Hz), the noise filter is energized.
4. When the oven door is opened, the oven lamp lights.
MICROWAVE COOKING CONDITION
HIGH COOKING
When the door is closed, the contacts primary latch, 2nd latch and 3rd latch switches + SW3 are activated. When the microwave power control is set to “ HIGH ” position and cooking time is selected by turning the timer and push the start button, the following operations occur: (Figure 0-2)
1. The contacts of the timer motor and vari switch are closed.
2. The contacts (
COM-NO) of the cook switch are closed.
3. Then following components are energized.
COM-NO of the
SW1 + SW2
8. MONITOR SWITCH CIRCUIT The monitor switch
oven door and monitors the operation of the relay
SW5 is mechanically controlled by the
RY1.
8-1. When the oven door is opened during or after a cooking
cycle, the primary latch switch
SW3 must open their contacts (COM-NO) first.
switch After that the contacts (
COM-NC) of the monitor switch
SW1 and the 3rd latch
SW3 can be closed and the 2nd latch switch SW2 must open its contacts (
COM-NO). And then the cook switch
SW4 must open its contacts (COM-NO).
8-2. When the oven door is closed, the contacts (
of the monitor switch
SW5 must be opened.
COM-NC)
8-3. When the oven door is opened and the contacts of the
RY1 remain closed, the fuse F6.3A F1 will blow,
relay because the contacts (
COM-NC) of the monitor switch
SW5 are closed and a short circuit is caused through the
RY1, the monitor resistor R1 monitor switch SW5,
relay and the fuse F6.3A
F1
MEDIUM HIGH, MEDIUM, MEDIUM LOW, LOW COOKING
When the microwave oven is preset for variable cooking power, the 220-230 volts A.C. power is supplied to the high voltage transformer intermittently within a 26.4-second time base through the vari switch. The following levels of micro­wave power are given.
Oven lamp High voltage transformer Timer motor Fan motor . Turntable motor Magnetron Surge relay RY2 Relay RY1
The line voltage is supplied to the primary winding of the high voltage transformer. The voltage is converted to about 3.3 volts A.C. on the filament winding, and approximately 2000 volts A.C. on the secondary winding.
4. The 3.3 volts filament winding voltage heats the magnetron filament and the 2000 volts secondary winding voltage is sent to a voltage doubler circuit, where it is doubled to a negative voltage of approximately DC 4000 volts.
5. The 2450MHz microwave energy produced in the magnetron generates a wave length of 12.24 cm. This energy is changed through the waveguide (transport channel) into the oven cavity, where the food is placed to be cooked.
6. Upon completion of the selected cooking time, the timer bell rings, and contacts of the timer are open, then the activated components as item 2 are de-energized.
7. When the door is opened during a cooking cycle, the switches come to the following positions.
Condition
Switch Contact Durning Oven Door
Cooking Open(No cooking)
primary latch Switch COM-NO Closed Opened
COM-NC Opened Closed 2nd latch switch COM-NO Closed Opened Monitor Switch COM-NC Opened Closed 3rd latch switch COM-NO Closed Opened
SETTING
26.4 sec. ON
HIGH
20.4 sec. ON
MEDIUM HIGH
14.5 sec. ON
MEDIUM
8.6 sec. ON
MEDIUM LOW
4.4 sec. ON
LOW
6 sec. OFF
Approx. 70%
11.9 sec. OFF Approx. 50%
17.8 sec. OFF Approx. 30%
22 sec. OFF
Approx. 10%
Note: The ON/OFF time ratio does not exactly correspond
to the percentage of microwave power, because approx. 3 seconds are needed for heating up the magnetron filament.
4
FUNCTION OF IMPORTANT COMPONENTS
R-5L16
DOOR OPEN MECHANISM
The door can be opened by pushing the door open button on the control panel. When the door open button is pushed, the cook lever is moved upward, operating the latch head. The latch head is moved upward, and released from the latch hook. Now, the door can be opened.
2ND. LATCH
LATCH HOOK
LATCH HEADS
DOOR OPEN BUTTON
SWITCH
PRIMARY LATCH SWITCH
MONITOR SWITCH
3RD. LATCH  SWITCH
OPEN LEVER
Figure D-1. Door Open Mechanism
PRIMARY LATCH SWITCH SW1
1. When the oven door is closed, the contacts (COM-NO) must be closed and the contacts (
COM-NC) must be
opened.
2. When the oven door is opened, the contacts ( must be opened and the contacts (
COM-NC) must be
COM-NO)
closed.
2ND LATCH SWITCH SW2 AND 3RD LATCH SWITCH
SW3
CAUTION: BEFORE REPLACING A BLOWN FUSE
F6.3A TEST THE RELAY SWITCH
SW3 AND MONITOR RESISTOR R1
RY1, MONITOR
F1
FOR PROPER OPERATION. (REFER TO CHAPTER “TEST PROCEDURE.)
MONITOR RESISTOR Rl 4.3Ω 20W
The monitor resistor prevents the fuse F1 F6.3A bursting when the fuse
F1 F6.3A blows due to the operation of the
monitor switch.
TIMER MOTOR (WITH VARI-SWITCH) TM
Timer contacts
1. When the timer is at “ TM are opened.
2. When the timer is turned clockwise from “ contacts of the timer
Vari-contacts (COM-NO):
The vari-contacts are operated by the cam roller. If the variable cooking control is set at MEDIUM HIGH, MEDIUM, MEDIUM LOW or LOW cooking position, the line voltage is supplied to the high voltage transformer intermittently within a 26.4 seconds time base. The following chart shows the vari-contacts (
COM—NO) operation in the various modes.
SETTING
HIGH
MEDIUM HIGH
MEDIUM
MEDIUM LOW
LOW
• “ position, the contacts of the timer
•” position, the
TM are closed.
26.4 sec. ON
20.4 sec. ON
14.5 sec. ON
8.6 sec. ON
4.4 sec. ON
6 sec. OFF
Approx. 70%
11.9 sec. OFF Approx. 50%
17.8 sec. OFF Approx. 30%
22 sec. OFF
Approx. 10%
1. When the oven door is closed, the contacts (COM-NO) must be closed.
2. When the oven door is opened, (
COM-NO) must be
opened.
COOK SWITCH SW4
1. When the oven door is closed and the start button is pushed, the contacts (
2. When the oven door is opened, (
COM-NO) must be closed.
COM-NO) must be
opened.
MONITOR SWITCH SW5
1. When the oven door is closed the contacts, (COM-NC) must be opened and the contacts ( closed.
2. When the oven door is opened the contacts, ( must be closed and the contacts ( closed.
3. If the oven door is opened ,and the contacts of the relay RY1 fail to open, the fuse F1 F6.3A blows simultaneously with closing the contacts (
COM-NC) of the monitor switch
SW5
COM-NO) must be
COM-NC)
COM-NO) must be
Note: The ON/OFF time ratio does not exactly correspond
to the percentage of microwave power, because approx. 3 seconds are needed for heating up the magnetron filament.
FUSE Fl F6.3A 250V
1. If the wire harness or electrical components are short­circuited, this fuse blows to prevent an electric shock or fire hazard.
2. The fuse also blows when the relay
RY1 remains closed with the oven door open and when the monitor switch SW5 closes.
SPECIAL FUSE F2
1. If the wire harness or electrical components are short­circuited, this fuse blows to prevent an electric shock or fire hazard.
2. The fuse blows when the asymmetric rectifier, H.V. rectifier, H.V. wire harness, H.V. capacitor, magnetron or secondary winding of high voltage transformer is shorted.
5
R-5L16
THERMAL CUT-OUT 125°C TC1 (MG)
The thermal cut-out protects the magnetron against over­heat. If this temperature goes up higher than 125°C because the fan motor is interrupted, the ventilation openings are blocked, the thermal cut-out TC1 will open and line voltages to the high voltage transformer T will be cut off and the operation of the magnetron MG will be stopped. The defective thermal cut-out TC1 must be replaced with new one.
THERMAL CUT-OUT 125°C TC2 (OVEN)
The thermal cut-out located on the top of the oven cavity is designed to prevent damage to the oven if the foods in the oven catch fire due to over heating produced by improper setting of cook time or failure of control unit. Under normal operation, the oven thermal cut-out remains closed. How­ever, when ab-normally high temperatures are reached within the oven cavity, the oven thermal cut-out will open at 125°C, causing the oven to shut down. The defective thermal cut-out TC2 must be replaced with new one.
TURNTABLE MOTOR
The turntable motor drives the turntable roller assembly to rotate the turntable.
FAN MOTOR
The fan motor drives a blade which draws external cool air. This cool air is directed through the air vanes surrounding the magnetron and cools the magnetron. This air is channelled through the oven cavity to remove steam and vapours given off from the heating foods. It is then exhausted through the exhausting air vents at the oven cavity.
NOISE FILTER
The noise filter prevents the radio frequency interference that might flow back in the power circuit.
SURGE RELAY RY AND SURGE RESISTOR R2
Ω/20W
10
2. After approx, 6msec. the contacts of the surge relay RY2 close and the line voltage is supplied to the high voltage transformer T.
3. If the surge resistor R2 is defective, the home fuse or fuse F2 may break down when the oven is switched on.
4. If the contacts of the surge relay RY2 remains opened after 6msec. since the oven is switched on the temperature of the surge resistor R2 of may rise high and may damage the electric or mechanical parts around the surge resistor R2.
ASYMMETRIC RECTIFIER
The asymmetric rectifier is a solid state device that prevents current flow in both directions. And it prevents the tempera­ture rise of the high voltage transformer by blowing the special fuse F2 when the high voltage rectifier is shorted.
AB
D2 D1
ASYMMETRIC RECTIFIER
HIGH VOLTAGE RECTIFIER
C
The rated peak reverse voltage of D1 of the asymmetric rectifier is 6 KV. The rated peak reverse voltage of D2 of the asymmetric rectifier is 1.7 KV. D1 and D2 of the asymmetric rectifier or high voltage rectifier are shorted when the each peak reverse voltage goes beyond the each rated peak reverse voltage. (The process of blowing the special fuse F2)
1. The high voltage rectifier is shorted by any causes when microwave cooking.
2. The peak reverse voltage of D2 of the rectifier goes beyond the rated peak reverse voltage 1.7 KV in the voltage doubler circuit.
3. D2 of the rectifier is shorted.
4. The large electric currents flow through the high voltage winding of the high voltage transformer.
5. The large electric currents beyond 10A flow through the primary winding of the high voltage transformer.
6. The special fuse F2 blows by the large electric currents.
7. The power supply to the high voltage transformer is cut off.
1. When the oven is switched on the surge current (peak current) flows through the surge resistor R2, for approx. 6msec. The surge resistor R2 puts down the surge current (peak current).
6
R-5L16
SERVICING
WARNING TO SERVICE PERSONNEL
Microwave ovens contain circuitry capable of producing very high voltage and current. Contact with following parts will result in electrocution. High voltage capacitor, High voltage transformer, Magnetron, High voltage rectifier assembly, High voltage harness.
REMEMBER TO CHECK
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 charged about 60 seconds after the oven has been switched off. Wait for 60 seconds and then short­circuit the connection of the high-voltage capacitor (that is, of the connecting lead of the high-voltage rectifier) against the chassis with the use of an insulated screwdriver.
Sharp recommend that wherever possible fault-finding is carried out with the supply disconnected. It may in, some cases, be necessary to connect the supply after the outer case has been removed, in this event carry out 3D checks and then disconnect the leads to the primary of the power transformer. Ensure that these leads remain isolated from other components and the oven chassis. (Use insulation tape if necessary.) When the testing is completed carry out 3D checks and reconnect the leads to the primary of the power transformer.
3D
REMEMBER TO CHECK
1) Reconnect all leads removed from components during testing.
2) Replace the outer case (cabinet).
3) Reconnect the supply.
4) Run the oven. Check all functions.
Microwave ovens should not be run empty. To test for the presence of microwave energy within a cavity, place a cup of cold water on the oven turntable, close the door and set the power level to HIGH. And set the microwave timer for two (2) minutes. When the two minutes has elapsed (timer at zero) carefully check that the water is now hot. If the water remains cold carry out 3D checks and re-examine the connections to the component being tested.
4R
When all service work is completed, and the oven is fully assembled, the microwave power output should be checked and microwave reakage test carried out.
TROUBLESHOOTING GUIDE
When troubleshooting the microwave oven, it is helpfull to follow the Sequence of Operation in performing the checks. Many of the possible causes of trouble will require that a specific test be performed. These tests are given a proce­dure letter which will be found in the "Test Procedure"section.
IMPORTANT: If the oven becomes inoperative because of
a blown fuse switch - monitor resisitor circuit, check the 1relay resistor before replacing the fuse
F1 in the relay RY1 - monitor
RY1, monitor switch and monitor
F1 (F6.3A).
7
R-5L16
CONDITION
OFF CONDITION
TEST PROCEDURE
POSSIBLE CAUSE
AND
DEFECTIVE PARTS
PROBLEM
Home fuse or breaker blows when power cord is plugged into wall outlet.
Fuse (F1) F6.3A blows when the door is opened.
Oven does not operate at all.
ABCDEEEEE FG G GH I JKL M M N
MAGNETRON
HIGH VOLTAGE TRANSFORMER
RECTIFIER ASSEMBLY
H.V. CAPACITOR
PRIMARY LATCH SWITCH
2ND LATCH SWITCH
MONIOTR SWITCH
3RD LATCH SWITCH
COOK SWITCH
THERMAL CUT-OUT 125˚C
TIMER MOTOR
TIMER CONTACT
TIMER VAR. SWITCH
SPECIAL FUSE
FUSE 6.3A
SURGE RELAY RY2
NOISE FILTER
SURGE RESISTOR
POWER SUPPLY CORD
SHORTED WIRE HARNESS
OPENED WIRE HARNESS
WALL OUTLET
FAN MOTOR
OVEN LAMP OR SOCKET
TURNTABLE MOTOR
MISADJUSTMENT SWITCH
RELAY RY1
COOKING CONDITION
Heat is produced in oven load but oven lamp does not light.
Heat is produced in oven load but fan motor does not operate.
Heat is produced in oven load but timer motor does not operate.
Heat is produced in oven load but turn-table motor does not operate.
Oven stops as soon as the oven is started.
Oven seems to be operating but little or no heat is pro­duced in oven load. (Vari­able cooking control is set at "HIGH" position).
Oven does not operate prop­erly in any other position ex­cept "HIGH" position. (Oven operate properly at HIGH).
Oven goes into cook cycle, but shuts down before end of cycle.
Home fuse or breaker blows when the oven is started
Oven lamp lights but the other electrical parts do not operate.
8
Loading...
+ 22 hidden pages
Buy Points How it Works FAQ Contact Us Questions and Suggestions Privacy Policy Cookie Policy Terms of Use