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Panasonic Rice Cooker Sr Ga721 Srga281 Srga421 Operating Instructions

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    Service Manual
    Order No. PHAT070510C3
    Automatic Rice Cooker
    SR-GA421/SR-GA281/SR-GA721
    EXPORT
    ©  2007  Panasonic  Home  Appliance  (Thailand)  Co.,Ltd 
    All  rights  reserved.  Unauthorized  copying  and  distrbution  
    is a violation of law. 
    Specification 
    Specification subject to change without notice. 
    ModelSR-GA421SR-GA281SR-GA721Detail
    CountryHKSIN-DBDSIN-RBDMALAYSIAHKMALAYSIASIN-DBDSIN-RBDUSA
    Power Source220 V / 50 Hz 230 V / 50 Hz220 V / 50 Hz240 V / 50 Hz220 V / 50 Hz240 V / 50 Hz230 V / 50 Hz 220 V / 50 Hz208 V / 60 Hz
    Powerconsumption 
    Cooking1400 W950 W2500 W
    Warming
    47.5 W
    Cooking capacity5 ~ 23 L5 ~ 15 L3 ~ 7 L
    Center thermostatworking temperature140 °C
    Keep warm temperature More than equal to 80 °C (After 1 Hr. keep warm)
    Thermal fuse specification 113  
    169 °C
    Dimension (mm)Width x Depth x Height 429 x 369 x 300367x 295x 305248 x 247 x 255
    Weight
    5.5 kg3.6 kg10.1 kg
    Power Cord (approx.)1.0 m
    AccessoriesMeasuring cup, Steaming basket Rice scoop
    COOKWARM
    Rice Cooking
    Keep WarmSR-928
    SR-GA421/SR-GA281SR-GA721 
    						
    							
    2
    SR-GA421/SR-GA281/SR-GA721
    
    WARNINGThis service information is designed for experienced repair technicians only and is not designed for use by the general public.It does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product.
    Products powered by electricity should be serviced or repaired only by experienced professional technicians. Any attempt to service or 
    repair the product or products dealt with in this service information by anyone else could result in serious injury or death.
    There are special components used in this equipment which are important for safety . These parts are marked by 
     in the Schematic
    Diagrams, Circuit Board Diagrams, Exploded Views and Replacement Parts List. It is essential that these critical parts should 
    be replaced with manufacturer’s specified parts to prevent shock, fire or other hazards. Do not modify the original design without 
    permission of manufacturer.
    IMPORTANT SAFETY NOTICE
    CONTENTS
    1.SCHEMATIC DIAGRAM & WIRING DIAGRAM .....................................................................3-4
    2.FUNCTION OF CENTER THERMOSTAT AND THERMAL FUSE .........................................
    5-6
    3.TROUBLE SHOOTING GUIDE  ...............................................................................................7-8
    4.TESTING PROCEDURE .........................................................................................................9-10
    5.EXPLODED VIEW & PACKING VIEW (SR-GA421/SR-GA281)  ............................................11-12
    6.REPLACEMENT OF PARTS LIST & PACKING LIST
     (SR-GA421/SR-GA281)  ....................13-14
    7.EXPLODED VIEW & PACKING VIEW (SR-GA721) ..............................................................15-16
    8.REPLACEMENT OF PARTS LIST & PACKING LIST
     (SR-GA721) .......................................17-18
    Page 
    						
    							
    3
    SR-GA421/SR-GA281/SR-GA721
    
    L
    N
    MICA HEATER ASS’YCAST HEATER
    LAMP RESIST
    .
    T.F.
    INPUT SWITC
    H
    LAMP RESIST.
    KEEP W ARM NEON LAMP 
    (BIG)
    (SMALL
    )
    E
    Green
    RICE COOKING NEON LAMP 
    Lamp Lead Wire A (Orange) Lead Wire (Orange)
    Lamp Lead Wire C (Brown) 
    Twist one time
    Lamp Lead Wire B (Gray) 
    Lever Earth Lead Wire (Green)
    Silicone Tube (Blue)
    N
    T
    wist two time
    Thermal Fuse Wire (Gray)Switch Lead Wire (Blue)
    Cord Wire Earth (Green)Silicone Tube (Green)
    Silicone Tube (Brown)
    Cord Bush10˚±5˚
    Thermal Fuse Wire (Brown)
    N
    Cord Bush
    Silicone Tube (Blue)Silicone Tube (Brown)
    After ass’ y, Mica Heater Ass’ y must not overlie
    the Outer Case of Center Thermostat.
    Water guard
    Cord Wire Earth (Green)Silicone Tube (Green)
    Thermal Fuse Wire (Blue) Lever Earth Lead Wire (Spiral Green)
    Wiring Lead Wire (Brown
    ) Lamp Lead Wire A (Red)Lamp Lead Wire C (Brown
    )
    Twist one time Thermal Fuse Wire (Gray)Lamp Lead Wire B (Gray)After assembly Mica Heater case
     
    Must no touch the terminal of cast heat.
    Glass tape 20 x 20 mm
    .
    After ass’y, gap between terminal and mica heater case must be more than 4 mm.
    10˚±5˚
    Cast Heater
    Lamp Resistor
    Lamp Resistor
    SwitchKeep W arm Neon Lamp
    Rice Cooking Neon Lam
    p
    Gra
    y
    Input Blue
    Brown
    N
    L
    E
    Gree
    n
    Mica Heater Ass’y
    T.F.
    T.F.
    
    1. SCHEMATIC DIAGRAM & WIRING DIAGRAM
    SCHEMATIC DIAGRAM (SR-GA421)WIRING DIAGRAM (SR-GA421)
    SCHEMATIC DIAGRAM 
    (SR-GA281)WIRING DIAGRAM (SR-GA281) 
    						
    							
    4
    SR-GA421/SR-GA281/SR-GA721
    
    Cord Wire Earth (Green)
    Cord Wire Blue (N) Cord Wire Brown (L)Heater lead wire B (grey)
    Thermal fuse lead wire (Blue) Thermal fuse lead wire (Grey
    )
    User position Heater lead wire C (Brown)
    Heater lead wire A (Red) Grey
    Brown
    Red
    Cathode lead wire (Brown
    )
    Keep warm lamp lead (Red
    )
    10˚±5˚
    MICA HEATER ASS’Y
    CAST HEATER
    LAMP RESIST.
    SWITCH
    LAMP RESIST.
    KEEP WARM NEON LAMP 
    RICE COOKING NEON LAMP 
    (SMALL)
    (MIDDLE)
    (BIG)
    E
    GreenINPUT
    L
    N
    Brown
    Blu
    e
    1.F.T2.F.T
    
    1. SCHEMATIC DIAGRAM & WIRING DIAGRAM
    SCHEMATIC DIAGRAM (SR-GA721)
    WIRING DIAGRAM (SR-GA721) 
    						
    							
    5
    SR-GA421/SR-GA281/SR-GA721
    
    2. FUNCTION OF CENTER THERMOSTAT AND THERMALFUSE
    A. Center Thermostat
    The center thermostat senses when the bottom of the rice cooker pan reach 134°C ± 6°C. 
    And it’s action turns off the cooking cycle, and starts the warming cycle.
    Refer to these figures showing the center thermostat construction and cooking position.  As 
    the metal is heated, its ability to be attracted by the magnet decreases.
    Finally, the inner spring pressure becomes stronger than the magnetic pull and the metal 
    and magnet will pop apart. The rod activates the switch lever which causes the auxiliary lever to 
    press the micro-switch button into the warming cycle.
    B. Switch-On Preventive System
    This is design to prevent the rice cooker from being turned on without the pan placed into 
    position.
    1) Normally when the pan is inserted properly into the rice cooker , the pan will depress the 
    center thermostat. The center thermostat outer spring will be compressed. In this case when 
    the switch button is depressed, the following will happen:
    a. The auxiliary lever will release the micro-switch button. This puts the micro-switch in the 
    cook position.
    b. The switch lever will push the rod which will allow the magnet to meet with the metal.
    c. When the rice is cooked and the proper temperature has been reached 134°C ± 6°C, the 
    metal and magnet will pop apart as described in the center thermostat operation above.
    d. The rod will push the switch lever and cause the auxiliary lever to depress the micro-
    switch button. Th
    is puts the micro-switch in the warming position.
    2) When the pan is not in place w ithin the rice cooker, the center thermostat is not depressed.
    a. In this condition, the outer spring is not compressed within the center thermostat 
    preventing the metal from reaching its normal operating position.
    b. When the switch button is depressed, the switch lever and auxiliary lever work as above 
    but the magnet cannot come in contact with the metal to hold the switch lever in the cook 
    position. This happens because the switch lever hits the t
    hermostat case and cannot push 
    the rod, with the magnet attached, all they way up to meet with the metal.
    c. When the pressure is taken off the switch butto
    n, the switch lever releases immediately to 
    the open or warm positions.
    Metal 
    Magnet
      Inner spring 
    Cooking heater
     
    Rod 
    10mm  Outer spring 
    Switch lever  Cook switch button 
    Micro switch 
    Thermostat case
     
    Thermostat surface 
    Auxiliary lever 
    Metal 
    Magnet
      Inner spring 
    Cooking heater
     
    Rod  Inner spring  Outer  
    spring  Switch lever
     Cook switch button 
    Micro switch
     
    NC 
    C 
    Center thermostat construction
    (Cooking Position) (Warming or Off Position)Figure 1 
    						
    							
    6
    SR-GA421/SR-GA281/SR-GA721
    
    C. Thermal Fuse
    The thermal fuse is used to open the circuit to the cooking heater when the temperature has 
    gone unusually high. This happens in case
    s such as incomplete contact between the heater 
    and pan or if the switch buttons is forced to stay on keeping the heater energized abnormally .
    This fuse is not a resetting device and must be replaced after openning.
    Whenever replacing the fuse make sure the protective cover is placed over all exposed wiring.
    Cause of Fusion
    [A] Improper contract between heater and pan
    2. FUNCTION OF CENTER THERMOSTAT AND THERMALFUSE
    [B] Forced application of current
    Cause
    Pan collar or deformed
    Foreign matter adheringBody dented or deformedPan bottom dented or 
    deformed
    Heater surface deformed 
    or corroded
    Remedy
    Remove foreign matter 
    by of (-) screw-driver, 
    etc., and then polish with 
    = 320 water paper while 
    wetting it with water.Repair or replace body.
    Replace pan.
    Replace cooking heater.
    Cause
    Chopstick,  wooden 
    piece, etc. inserted onto 
    cooking button. (continu-
    ous application of current)
    Switch lever deformed 
    or maladjusted, causing 
    continuous application of 
    current.
    Remedy
    Inserted to prevent ear-
    lier turning off? Refer to 
    cause in (a) above.
    Repair or replace parts.
    When fusion takes place, check the cause, set right the faulty section, and be sure to use 
    replacement parts.  
    						
    							
    7
    SR-GA421/SR-GA281/SR-GA721
    
    3. TROUBLESHOOTING GUIDE
    SymptomDiagnosisRemedy
    Cooking function
    ● Cooking fails (Cooking 
    lamp is not shown)
    No continuity of cord?Yes ● Replace AC cord. 
    No continuity of thermal fuse? Yes
     
    ● Locate cause for fusing and 
    replace fuse. 
    No continuity of micro switch?
    Yes
     
    ● Replace 
    Frame ass’y. 
    Center thermostat is broken?
    (Checked evaporation test) Yes
     
    ● Replace center thermostat. 
    Switch lever properly adjust?
    No 
    ● 
    Adjust Switch lever. 
    ● Cooking fails (Cooking 
    lamp is not shown)No continuity of sheathed heater? Yes
     
    ● Replace sheathed heater. 
    ● Thermal fuse blown
    Forced application of current?
    Yes
     
    ● Explain correct usage. 
    ●  Rice burns (Brown color)
    Center thermostat defective?
    (Check with evaporation test) Yes
     
    ● Replace center thermostat. 
     Switch lever has been properly adjusted?
    No 
    ● Adjust Lever. 
    Usage correct?
    ● Rice is not rinced well enough?
    ● Using with low rated voltage?
    ● 
    Too much water input for cooking? Yes
     
    ● Explain correct usage. 
    When receiving the cooker to be repaired, be sure to always take charge of not only the 
    cooker body but also the pan and the lid, and ask for details as to the symptom of the trouble.
    Furthermore, when making troubleshooting of each part, be sure to remove the power plug from 
    the socket.
    No 
    No 
    No 
    No 
    No 
    Yes  
    						
    							
    8
    SR-GA421/SR-GA281/SR-GA721
    
    3. TROUBLESHOOTING GUIDE
    SymptomDiagnosisRemedy
    ● Earlier Switching-off
    ● Poor cooking finish
    Too hard
    Too soft
    Half-boiled
    Poor contact between pan and sheathed 
    heater? (Check with bubbling test)Yes 
    ● Replace pan or sheathed 
    heater.
     
    Center thermostat defective?
    (Check with evaporation test) Yes
     
    ● Replace Center thermostat. 
    Switch lever has been properly adjusted?
    No 
    ● Adjust switch lever. 
    Usage correct?
    ● Too small or large in rice quantit
    y.
    ● Too small or large in water quantity.
    ● Switched off once by hand in cooking 
    process.
    ● Switched off by shocks given in cooking 
    process.
    ● Rice not untied.
     
    ● Explain correct usage. 
    Keep warm function
    ● Warming fails (Warm lamp 
    not shown)Micro switch change contact to NO (Warm 
    mode) after cooking is done?
    No 
    ● Adjust switch lever. 
    ● Warming fails (Warm lamp 
    shown)
    No continuity of warming heater? Yes
     
    ● Replace warming heater. 
    No 
    No 
    Yes  
    						
    							
    9
    SR-GA421/SR-GA281/SR-GA721
    
    4. TESTING PROCEDURE
    1. Bubbling testInput the pan in the main body, and lightly rotate the pan clockwise and counter clockwise 
    to set the pan on the heating plate properly.
    1.  Fill water until the center area of the pan bottom is dipped, and close the lid.  Then turn 
    on the boiling switch.
    2. When it beings boiling to produce steam, remove the lid and immediately check the 
    bubbling condition on the pan bottom.
    3. Bubbling condition is shown in figure 3.
    A. Bubbles generate through out the circumference of the pan bottom ............... Proper
    B. Bubbles does not generate on more than one quater part of the pan bottom 
    circuference .................................................................................................. Improper
    If it is improper, it may result from the insfficient contact between the pan bottom and 
    the sheathed heater.
     Check the pan bottom and the sheathed heater for foreign material 
    remained. Clean up the foreign materials or replace the parts.
    2. Evaporation test
    1. After satisfactory bubbling i s confirmed, remove the lid and put a weight on the cooker.
    2. Cover the entire pan bottom with 2 or 3 pieces of tissue paper (or gauze), and turn on 
    the switch subsequently.
    3. Th
    e cooker is considered acceptable if the timing when steam generation comes to 
    a stop after water of the pan bottom has evaporated, is within 1 minute before and 
    after the cooking switch is turned off. If these requirements are not satisfied, check the 
    center  thermostat as well as the contacted condition between the pan bottom and the 
    cooking heater, and then repair or replace the parts.
    COOK
    WARM
    5 cm.
    .mc 04
    Pan (viewed from above)  Pan flange 
    section 
    Holes of 
    tissue paper 
    Tissue paper
     
    Water Level
    Sheathed heaterCenter thermostat
    Figure 2Figure 3
    Water Level
    AB 
    						
    							
    10
    SR-GA421/SR-GA281/SR-GA721
    
    4. TESTING PROCEDURE
    3. Boiling control lever adjustment
    Such a mechanical operation as center thermostat goes up and down is used to turn on 
    and off the micro
    -switch. Check and adjust this relationship  as shown below.
     When the boiling switch is turned on. When the boiling switch is turned off.
     
    CheckingThe auxiliary lever presses the push-
    button (The “WARM” lamp comes on.)The auxiliary lever does not press 
    the push-button (The “COOK” lamp 
    comes on.)
    AdjustingTo gain the above relationship, adjust the auxiliary lever by bending it with 
    long nose pliers. 
    						
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