R - 419CK
SUPPLEMENTAL SERVICE MANUAL
S100M140R419E
MICROWAVE OVEN
MODEL R-419CK
In the interest of user-safety the oven should be restored to its original condition and only parts identical to those specified should be used.
R-419CK |
WARNING TO SERVICE PERSONNEL: Microwave ovens con- |
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tain circuitry capable of producing very high voltage and |
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current, contact with following parts may result in a severe, |
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possibly fatal, electrical shock. (High Voltage Capacitor, High |
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Voltage Power Transformer, Magnetron, High Voltage Recti- |
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fier Assembly, High Voltage Harness etc..) |
This is a supplemental Service Manual for Microwave Oven model R-419CK. This model is quite similar to the base model R-420CK (S/M# S49M132R420CE).
This supplemental manual must be used in conjunction with the base model service manual for complete operation, service, safety and replacement parts information.
TABLE OF CONTENTS |
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PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO |
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AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY .................... |
INSIDE FRONT COVER |
BEFORE SERVICING ...................................................................................................... |
INSIDE FRONT COVER |
WARNING TO SERVICE PERSONNEL ............................................................................................................... |
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MICROWAVE MEASUREMENT PROCEDURE................................................................................................... |
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FOREWORD AND WARNING ............................................................................................................................. |
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PRODUCT SPECIFICATIONS ............................................................................................................................. |
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GENERAL INFORMATION ................................................................................................................................. |
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OPERATION ........................................................................................................................................................ |
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TEST PROCEDURE ............................................................................................................................................ |
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PICTORIAL DIAGRAM ....................................................................................................................................... |
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LSI UNIT CIRCUIT ............................................................................................................................................. |
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PARTS LIST ....................................................................................................................................................... |
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PACKING AND ACCESSORIES ........................................................................................................................ |
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This document has been published to be used for after
SHARP ELECTRONCS CORPORATION sales service only.
The contents are subject to change without notice.
Service Headquarters: Sharp Plaza, Mahwah, New Jersey, 07430-2135
R-419CK
PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY
(a)Do not operate or allow the oven to be operated with the door open.
(b)Make the following safety checks on all ovens to be serviced before activating the magnetron or other microwave source, and make repairs as necessary: (1) interlock operation, (2) proper door closing, (3) seal and sealing surfaces (arcing, wear, and other damage), (4) damage to or loosening of hinges and latches, (5) evidence of dropping or abuse.
(c)Before turning on microwave power for any service test or inspection within the microwave generating compartments, check the magnetron, wave guide or transmission line, and cavity for proper alignment, integrity, and connections.
(d)Any defective or misadjusted components in the interlock, monitor, door seal, and microwave generation and transmission systems shall be repaired, replaced, or adjusted by procedures described in this manual before the oven is released to the owner.
(e)A microwave leakage check to verify compliance with the Federal Performance Standard should be performed on each oven prior to release to the owner.
BEFORE SERVICING
Before servicing an operative unit, perform a microwave emission check as per the Microwave Measurement Procedure outlined in this service manual.
If microwave emissions level is in excess of the specified limit, contact SHARP ELECTRONICS CORPORATION immediately @1-800-237-4277.
If the unit operates with the door open, service person should 1) tell the user not to operate the oven and 2) contact SHARP ELECTRONICS CORPORATION and Food and Drug Administration's Center for Devices and Radiological Health immediately.
Service personnel should inform SHARP ELECTRONICS CORPORATION of any certified unit found with emissions in excess of 4mW/cm2. The owner of the unit should be instructed not to use the unit until the oven has been brought into compliance.
R-419CK
WARNING TO SERVICE PERSONNEL
Microwave ovens contain circuitry capable of producing very high voltage and current, contact with following parts may result in a severe, possibly fatal, electrical shock.
(Example)
High Voltage Capacitor, High Voltage Power Transformer, Magnetron, High Voltage Rectifier Assembly, High Voltage Harness etc..
Read the Service Manual carefully and follow all
instructions.
Don't Touch ! Danger High Voltage
Before Servicing
1. Disconnect the power supply cord |
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remove outer case. |
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2.Open the door and block it open.
3.Discharge high voltage capacitor.
WARNING:RISK OF ELECTRIC SHOCK. DISCHARGE THE HIGH-VOLTAGE CAPACITOR BEFORE SERVICING.
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 highvoltage capacitor (that is the connecting lead of the highvoltage rectifier) against the chassis with the use of an insulated screwdriver.
Whenever troubleshooting is performed the power supply must be disconnected. It may in, some cases, be necessary to connect the power supply after the outer case has been removed, in this event,
1.Disconnect the power supply cord, and then remove outer case.
2.Open the door and block it open.
3.Discharge high voltage capacitor.
4.Disconnect the leads to the primary of the power transformer.
5.Ensure that the leads remain isolated from other components and oven chassis by using insulation tape.
6.After that procedure, reconnect the power supply cord.
When the testing is completed,
1.Disconnect the power supply cord, and then remove outer case.
2.Open the door and block it open.
3.Discharge high voltage capacitor.
4.Reconnect the leads to the primary of the power transformer.
5.Reinstall the outer case (cabinet).
6.Reconnect the power supply cord after the outer case is installed.
7.Run the oven and check all functions.
After repairing
1.Reconnect all leads removed from components during testing.
2.Reinstall the outer case (cabinet).
3.Reconnect the power supply cord after the outer case is installed.
4.Run the oven and 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 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 Before Servicing procedure and reexamine the connections to the component being tested.
When all service work is completed and the oven is fully assembled, the microwave power output should be checked and a microwave leakage test should be carried out.
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R - 4 1 9 C K
MICROWAVE MEASUREMENT PROCEDURE
A. Requirements:
1)Microwave leakage limit (Power density limit): The power density of microwave radiation emitted by a microwave oven should not exceed 1mW/cm2 at any point 5cm or more from the external surface of the oven, measured prior to acquisition by a purchaser, and thereafter (through the useful life of the oven), 5 mW/cm2 at any point 5cm or more from the external surface of the oven.
2)Safety interlock switches Primary interlock relay and door sensing switch shall prevent microwave radiation emission in excess of the requirement as above mentioned, secondary interlock switch shall prevent microwave radiation emission in excess of 5 mW/cm2 at any point 5cm or more from the external surface of the oven.
B. Preparation for testing:
Before beginning the actual measurement of leakage, proceed as follows:
1) Make sure that the actual instrument is operating normally as specified in its instruction booklet.
Important:
Survey instruments that comply with the requirement for instrumentation as prescribed by the performance standard for microwave ovens, 21 CFR 1030.10(c)(3)(i), must be used for testing.
2)Place the oven tray in the oven cavity.
3)Place the load of 275±15 ml (9.8 oz) of tap water initially at 20±5O C (68OF) in the center of the oven cavity.
The water container shall be a low form of 600 ml (20 oz) beaker with an inside diameter of approx. 8.5 cm (3-1/2 in.) and made of an electrically nonconductive 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.
4)Set the cooking control on Full Power Cooking Mode.
5)Close the door and select a cook cycle of several minutes. If the water begins to boil before the survey is completed, replace it with 275 ml of cool water.
C. Leakage test:
Closed-door leakage test (microwave measurement)
1)Grasp the probe of the survey instrument and hold it perpendicular to the gap between the door and the body of the oven.
2)Move the probe slowly, not faster than 1 in./sec. (2.5 cm/sec.) along the gap, watching for the maximum indication on the meter.
3)Check for leakage at the door screen, sheet metal seams and other accessible positions where the continuity of the metal has been breached (eg., around the switches, indicator, and vents).
While testing for leakage around the door pull the door away from the front of the oven as far as is permitted by the closed latch assembly.
4)Measure carefully at the point of highest leakage and make sure that the highest leakage is no greater than 4mW/cm2, and that the secondary interlock switch does turn the oven OFF before any door movement.
NOTE: After servicing, record data on service invoice and microwave leakage report.
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SERVICE MANUAL
MICROWAVE OVEN
R-419CK
FOREWORD
This Manual has been prepared to provide Sharp Electronics Corp. Service Personnel with Operation and Service Information for the SHARP MICROWAVE OVEN, R-419CK.
It is recommended that service personnel carefully study the entire text of this manual so that they will be qualified to render satisfactory customer service.
Check the interlock switches and the door seal carefully. Special attention should be given to avoid electrical shock and microwave radiation hazard.
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 no other visible damage with the oven.
Servicing and repair work must be carried out only by trained service personnel.
DANGER
Certain initial parts are intentionally not grounded and present a risk of electrical shock only during servicing. Service personnel - Do not contact the following parts while the appliance is energized;
High Voltage Capacitor, Power Transformer, Magnetron, High Voltage Rectifier Assembly, High Voltage Harness;
If provided, Vent Hood, Fan assembly, Cooling Fan Motor.
All the parts marked “*” on parts list are used at voltages more than 250V.
Removal of the outer wrap gives access to voltage above 250V.
All the parts marked “ ” on parts list may cause undue microwave exposure, by themselves, or when they are damaged, loosened or removed.
SHARP ELECTRONICS CORPORATION
SHARP PLAZA, MAHWAH,
NEW JERSEY 07430-2135
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R-419CK
PRODUCT DESCRIPTION
GENERAL INFORMATION
OPERATION
TROUBLESHOOTING GUIDE AND TEST PROCEDURE
WIRING DIAGRAM
PARTS LIST
R - 4 1 9 C K
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SPECIFICATION |
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ITEM |
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DESCRIPTION |
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Power Requirements |
120 Volts / 13.3 Amperes/1550Watts |
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60 Hertz |
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Single phase, 3 wire grounded |
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Power Output |
1100 watts (IEC-705 TEST PROCEDURE) |
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Operating frequency of 2450MHz |
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Case Dimensions |
Width 21-11/16" |
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Height 12-3/8" |
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Depth 17-3/8" |
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Cooking Cavity Dimensions |
Width |
15" |
1.4 Cubic Feet |
Height |
9-7/16" |
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Depth |
16-3/4" |
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Tray Size 14-1/8" Diameter |
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Control Complement |
Touch Control System |
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Clock ( 1:00 - 12:59 ) |
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Timer (0 - 99 min. 99 seconds) |
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Microwave Power for Variable Cooking |
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Repetition Rate; |
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P-HI ................................................. |
Full power throughout the cooking time |
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P-90 .................................................................... |
approx. 90% of Full Power |
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P-80 .................................................................... |
approx. 80% of Full Power |
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P-70 .................................................................... |
approx. 70% of Full Power |
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P-60 .................................................................... |
approx. 60% of Full Power |
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P-50 .................................................................... |
approx. 50% of Full Power |
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P-40 .................................................................... |
approx. 40% of Full Power |
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P-30 .................................................................... |
approx. 30% of Full Power |
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P-20 .................................................................... |
approx. 20% of Full Power |
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P-10 .................................................................... |
approx. 10% of Full Power |
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P-0 ..................................................... |
No power throughout the cooking time |
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BEVERAGE pad |
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MINUTE PLUS pad, INSTANT ACTION pads |
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COMPU DEFROST pads, Number selection pads |
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Power Level pad, Timer/Clock pad |
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Stop/Clear pad, START pad |
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Oven Cavity Light |
Yes |
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Safety Standard |
UL Listed |
FCC Authorized |
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DHHS Rules, CFR, Title 21, Chapter 1, Subchapter J |
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GENERAL INFORMATION
GROUNDING INSTRUCTIONS
This oven is equipped with a three prong grounding plug. It must be plugged into a wall receptacle that is properly installed and grounded in accordance with the National Electrical Code and local codes and ordinances.
In the event of an electrical short circuit, grounding reduces the risk of electric shock by providing an escape wire for the electric current.
WARNING: |
Improper use of the grounding plug can result in a risk of electric shock. |
Electrical Requirements
The electrical requirements are a 120 volt 60 Hz, AC only,
15 or 20 amp. fused electrical supply. It is recommended that a separate circuit serving only this appliance be provided. When installing this appliance, observe all applicable codes and ordinances.
A short power-supply cord is provided to reduce risks of becoming entangled in or tripping over a longer cord.
Where a two-pronged wall-receptacle is encountered, it is the personal responsibility and obligation of the customer to contact
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