Panasonic SR-GA421 Manual de usuario

Service Manual

Order No. PHAT070510C3

Automatic Rice Cooker

SR-GA421/SR-GA281/SR-GA721

EXPORT

is a violation of law.

Specification

Specification subject to change without notice.

Model SR-GA421 SR-GA281 SR-GA721

Detail

Country HK SIN-DBD SIN-RBD MALAYSIA HK MALAYSIA SIN-DBD SIN-RBD USA

Power Source

220 V / 50 Hz 230 V / 50 Hz 220 V / 50 Hz 240 V / 50 Hz 220 V / 50 Hz 240 V / 50 Hz 230 V / 50 Hz 220 V / 50 Hz 208 V / 60 Hz

Power

consumption

Cooking 1400 W 950 W 2500 W

Warming 47.5 W

Cooking capacity 5 ~ 23 L 5 ~ 15 L 3 ~ 7 L

Center thermostat

working temperature 140 °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 300

367

x 295

x 305

248 x 247 x 255

Weight 5.5 kg 3.6 kg 10.1 kg

Power Cord (approx.) 1.0 m

Accessories Measuring cup, Steaming basket Rice scoop

COOK

WARM

Rice Cooking

Keep Warm

SR-928

SR-GA421/SR-GA281 SR-GA721

SR-GA421/SR-GA281/SR-GA721

WARNING

This 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

SR-GA421/SR-GA281/SR-GA721

MICA HEATER ASS’Y

CAST HEATER

LAMP RESIST.

T.F.

INPUT

SWITCH

LAMP RESIST.

KEEP WARM NEON LAMP

(BIG)

(SMALL)

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)

Twist two time

Thermal Fuse Wire (Gray)

Switch Lead Wire (Blue)

Cord Wire Earth (Green)

Silicone Tube (Green)

Silicone Tube (Brown)

Cord Bush

Thermal Fuse Wire (Brown)

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.

Cast Heater

Lamp Resistor

Switch

Keep Warm Neon Lamp

Rice Cooking Neon Lamp

Gray

Input

Blue

Brown

Green

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)

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)

MICA HEATER ASS’Y

CAST HEATER

LAMP RESIST.

SWITCH

LAMP RESIST.

KEEP WARM NEON LAMP

RICE COOKING NEON LAMP

(SMALL)

(MIDDLE)

(BIG)

Green

INPUT

Brown

Blue

T2.

1. SCHEMATIC DIAGRAM & WIRING DIAGRAM

SCHEMATIC DIAGRAM (SR-GA721)

WIRING DIAGRAM (SR-GA721)

SR-GA421/SR-GA281/SR-GA721

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. This puts the micro-switch in the warming position.

2) When the pan is not in place within 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 thermostat 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 button, 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

Center thermostat construction

(Cooking Position) (Warming or Off Position)

Figure 1

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 cases 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

FUNCTION OF CENTER THERMOSTAT AND THERMALFUSE

[B] Forced application of current

Cause

Pan collar or deformed

Foreign matter adhering Body dented or deformed Pan 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.

SR-GA421/SR-GA281/SR-GA721

3. TROUBLESHOOTING GUIDE

Symptom Diagnosis Remedy

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?

● 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?

● 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.

Yes

SR-GA421/SR-GA281/SR-GA721

3. TROUBLESHOOTING GUIDE

Symptom Diagnosis Remedy

● 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?

● Adjust switch lever.

Usage correct?

●

Too small or large in rice quantity.

●

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?

● Adjust switch lever.

● Warming fails (Warm lamp

shown)

No continuity of warming heater?

Yes

● Replace warming heater.

Yes

SR-GA421/SR-GA281/SR-GA721

4. TESTING PROCEDURE

1. Bubbling test

Input 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 is 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. The 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.

Pan (viewed from above)

Pan flange

section

Holes of

tissue paper

Tissue paper

Water Level

Sheathed heater

Center thermostat

Figure 2 Figure 3

Water Level

A B

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.

Checking The 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.)

Adjusting To gain the above relationship, adjust the auxiliary lever by bending it with

long nose pliers.

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