Sharp R-9200 User manual

SHARP SERVICE MANUAL .

S3201 RSZOOJ//

CONVECTION

MICROWAVE OVEN

MODEL R-9200

In interests of user-safety the oven should be restored to its original

condition and only manufacturer original spare parts must be used.

(RD161OlU)

This is a supplemental Service Manual for Model R-9ZOO.

This model is quite similar to Base Model R-9HlO (Refer No. is S9808R9HlOJ//).

Use this supplemental manual together with the Base Model Service Manual.

Refer to the Base Model Service Manual for complete operation, service information, etc. (RD17101U)

TABLE OF CONTENTS Page

APPEARANCE VIEW ........................................................................................................... Inside front cover

GENERAL IMPORTANT INFORMATION ...................................................................................................... 1

CAUTION, MICROWAVE RADlATlON,WARNING ...................................................................................... 1

PRODUCT SPECIFICATIONS ......................................................................................................................... 2

OPERATION ....................................................................................................................................................... 3

FUNCTION OF IMPORTANT COMPONENTS .............................................................................................. 4

SERVICING ........................................................................................................................................................ 5

TEST PROCEDURE ........................................................................................................................................... 6

TOUCH CONTROL ASSEMBLY .................................................................................................................. 13

COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ..................................................... 21

MICROWAVE MEASUREMENT ................................................................................................................... 22

WIRING DIAGRAM ....................................................................................................................................... 23

PICTORIAL DIAGRAM .................................................................................................................................. 25

CONTROL PANEL CIRCUIT ......................................................................................................................... 26

PRINTED WIRING DIAGRAM ..................................................................................................................... 27

PARTS LIST .................................................................................................................................................... 28

SHARP CORPORATION *

Touch Control Panel

-43

1. Ventilation openings

2. Oven lamp

3. Hinges

4. Safety door latches

5. See through door

6. Door open button

7. Touch Control Panel

8. Digital readout

9. Waveguide cover

lO.Access cover for oven

lamp replacement

ll.Menue Label for Intelli-

gent Sensor

12.Low rack

13.High rack

14.Defrost rack

Convection I CONV AUTOCOOK+j

Fan Symbol

Micro/Defrost

Symbol

MIX SENSORDEFROSTTEMP

Indicator

WEIGHT ADJUST PAD

Press to zero the

your own dishes

INTELLIGENT SENSOR PAD

Press to select 12 popular Mix,

Grill and Micro cooking menu

with weight sensor or AH sensor.

cooking with weight sensor.

with weight sensor.

NUMBER AND TEMPERATURE-

PADS

Press to enter cooking times,

clock time, convection tem-

perature or to select the

Intelligent Sensor menus.

POWER LEVEL PADS

Pressto select microwave

power setting.

If not pressed, HIGH is auto-

matically selected.

STOP/CLEAR PAD

Press to erase during pro-

gramming.

Press once to stop operation

of oven during cooking; press

twice to cancel cooking pro-

gramme.

AUTO

I START/CLOCK PAD

Press to set clock or Auto

Start time.

*SENSOR INSTANT ACTION

PADS

Press once to cook 8 popular

menus.

CONVECTION COOKIN

FUNCTION PADS

Press to cook for each tunc-

tion.

*MORE, LESS PADS

Press to increase/decrease the

time in one minute increments

during cooking or to alter the

doneness for the Sensor Instant

Action, Intelligent Sensor or

Defrost Sensor modes.

IrlNSTANT COOK/START PAD

I Press once to cook for 1 minute

STOP START INSTANT COOK, - at HIGH or increase by 1 minute

CLEAR CLOCK START multiples each time this pad is

\ I

I / pressed during Microwave,

Convection, Grill or Mix cooking.

SERVICE MANUAL

SHARI=

CONVECTION MICROWAVE OVEN

R-9200

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 and base model manual, so they will

be qualified to render satisfactory customer service.

r- (RD36106

CAUTION

MICROWAVE RADIATION

Service engineers should not be exposed to the micro-

wave 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 ener-

gized. (RD36203U)

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.

All the parts marked “+‘I on parts list are used at voltages

more than 250V.

(RD5111 Ou)

SHARP CORPORATION

OSAKA, JAPAN

R-9ZOO

““?j PRODUCT DESCRIPTION

\ :‘:;j OPERATING SEQUENCE

- :;--;:;sj

“-”“+$j FUNCTION OF IMPORTANT

COMPONENTS

it< 2 ”

-*: i

-, “, .’ j

I< ” “,

I “s TEST PROCEDURE

i : ”f*

” *“>*

^rt ‘*a$

I^*

‘f TOUCH CONTROL PANEL

8~~9 ASSEMBLY

COMPONENTS

REPLACEMENT AND

ADJUSTMENT PROCEDURE

” “*

* -2. MICROWAVE MEASUREMENT

WIRING DIAGRAM

‘.

PARTS LIST

(RD37201 U)

R-9ZOO

PRODUCT DESCRIPTION

SPECIFICATIONS

ITEM

Power Requirements 240 Volts

50 Hertz

DESCRIPTION

Power Consumption

Power Output

Convection Heating element

Case Dimensions

Single phase, 3 wire earthed

16OOW (Microwave)

1600W (Convection)

800 watts nominal of RF microwave energy (2 litre water load)

900 watts (I EC-705-1 988)

Operating frequency of 2450M Hz

1500 w

Width 627 mm

Height 378 mm

Depth 481 mm

Cooking Cavity Dimensions Width 410 mm

Height 245 mm

Depth 410 mm

Control Complement Touch Control System

Clock( I:00 - 12:59 )

Timer (0 - 99 min. 99 sec. )

Microwave Power for Variable Cooking

Repetition Rate;

HIGH ..*............................. Full power throughout the cooking time

MED HIGH ............................................... approx. 70% of Full Power

MED .........................................................* approx. 50% of Full Power

MED LOW (DEFROST) .......................... approx. 30% of Full Power

LOW .........*................................................ approx. 10% of Full Power

Convection Temperature for Variable Cooking

CONVECTION ............................................ 40 to 250°C Temp. control

LOW M IX( BAKE) ........................ 180°C with 10% microwave power

HIGH MIX( ROAST) m...................

GRILL 200°C with 30% microwave power

............................................................................ 250°C

INTELLIGENT SENSOR pad (preheat)

DEFROST SENSOR pad

WEIGHT ADJUST pad

INSTANT ACTION SENSOR pads

NUMBER and TEMPERATURE pads

POWER LEVEL pads

MORE. LESS pads

STOP/CLEAR pad

Set Weight .

AUTO START/CLOCK pad

1 INSTANT COOK/START pad

Approx. 31 kg

(RD44101 U)

NOTE: Numbers and letters shown after sentences such as “RD44101 U” are for factory use only.

--.r-.w-- -.1---- ,---- -._ _ _

R-9ZOO

OPERATING SEQUENCE

INTELLIGENT SENSOR COOKING CONDI-

TION

The oven cooks foods automatically by using the

weight sensor cooking condition or the absolute hu-

midity sensor (AH sensor) cooking condition.

Weight sensor cooking condition.

1. The oven detects the weight of food automatically

when food is placed into the oven.

2. The oven sets the cooking condition and cooking

time automatically when the food category is

inputted.

3. The oven starts cooking when the start button is

pressed.

AH sensor cooking condition

1. This is the same as Sensor cooking condition of the

base model (R-9HlO)

INSTANT ACTION SENSOR COOKING

CONDITION

This is the same as INTELLIGENT SENSOR cooking

condition. In this condition the oven starts soon when

touching INSTANT ACTION SENSOR pads.

DEFROST SENSOR CONDITION

The oven heats food automatically by using Weight

sensor cooking condition.

SENSING FIRE OPERATION

The oven will stop its operation when there is fire in

the oven cavity in microwave cooking condition.

l LSI measures the voltage across the temperature

measurement circuit intermittently within a 32 sec-

ond time base since the oven is started in micro-

wave cooking condition. The oven will stop its

operation when the difference of the voltage is more

than 0.3 volts in microwave cooking condition.

Within a 32 second base, first thermistor is ener-

gized for 3 seconds. After 2 seconds since the

thermistor is energized, the voltage across the tem-

perature measurement circuit is measured. And af-

ter 21 seconds since the thermistor is cut off, the

convection motor operates for 6 seconds.

The oven carries out the procedure above again. If

the second voltage is 0.3V higher than the first

voltage, LSI judges it is a fire in the oven cavity and

stops the oven.

When sensor cooking, the sensing fire operation is

not carried out until the oven senses the steam from

food. Because food cannot be cooked well by ro-

tating the convection fan at that time. After sensing

the steam, the sensing fire operation is started.

When LSI judges it is fire in the oven cavity, LSI

will switch off the relays to the power transformer,

fan motor and convection motor and LSI stops

counting down.

that the fresh air

ity.

i f

CONVECTION , ,

MOTOR ; I

ON ;I

And then the damper is closed so

does not come into the oven cav-

2P 3? ?2 (sec.)

t?Osec. i i

! ’ !

ii I

1 1 3 sec. I

THERMISTOR + ;tc- I I

I I

Sensing

Voltage

Sensing the voltage across temperature

measurement circuit.

WEIGHT SENSOR

FUNCTION OF MAIN COMPONENTS

WEIGHT SENSOR ASSEMBLY

Micr-

computer

Weight Sensor - Osilator I WI)

J-U-LI -I

1. When the food is placed on the

turntable, the gap between the

elctrodes increases in direct pro-

portional to the weight of food.

The elctrodes have the function of

a capacitor.

2. The frequency of the

oscilator changes according

to the capacitance of the

weight sensor.

3. The micro-computer meas-

ures the weight of food by

detecting the change in the

oscilating frequency.

R-9ZOO

SERVICING

WARNING TO SERVICE PERSONNEL

Microwave ovens contain circuitry capable of producing very high voltage and current, contact with any part

of the high voltage circuit will result in electrocuition.

REMEMBER TO CHECK 3D

1) Disconnect the supply.

2) Door opened, an.d 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

short-circuit the connection of the

high-voltage capacitor (that is, of the con-

necting lead of the high-voltage rectifier)

~against the chassis with the use of an insu-

i lated screwdriver.

Sharp recommend that wherever possible

fault-finding is carried out with the supply discon-

nected. 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.

REMEMBER TO CHECK 4R

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 microwave

timer for two (2) minutes. Set the power level to

HIGH and push the START button. When the two

minutes has elapsed (timer at zero) carefully check

that the water is now hot. If the water remains cold

carry out 3IJ checks and re-examine the con-

nections 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 carried out.

TROUBLESHOOTINGGUIDE

When troubleshooting the microwave oven, it is helpful

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 be-

cause of a blown fuse M8A in the up-

per latch switch - lower latch switch -

monitor switch - monitor resistor cir-

cuit, check the upper latch switch,

lower latch switch, monitor switch and

monitor resistor before replacing the

fuse M8A.

;

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rsl

---

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TEST PROCEDURE RE J

POSSIBLE

CASE AND

;;l$ETIVE

:ONDITION I PROBLEM

Home fuse blows when power supply cord is

plugged into wall receptacle.

3FF Fuse blows when power supply cord is

CONDITION plugged into wall receptacle.

“88:88” does not appear in display when power

cord is first plugged into wall outlet.

Display does not operate properly when

STOP/CLEAR pad is touched. (An audible sig-

nal should sound and time of day should appear

on display.

Oven lamp does not light with door open.

Oven lamp does not light in cook cycle.

(Does light when door is opened.)

ZOOKING

ZONDTION Oven lamp does not light at all

Oven lamp lights, but turntable motor does not

operate

Cooling fan motor does not operate.

After start pad is touched, the oven stops and

display shows “ADD”, “TURN”, “TABLE”

Oven does not go into cook cycle when START

pad is touched.

Oven seems to be operating but little

MICROWAVE) or no heat is produced in oven load. (Food in-

completely cooked or not cooked at all at end

of cook cycle.)

Oven goes into a cook cycle but extremely un-

even heating is produced in open load (food)

I, I

Uven does not cook properly when programmed

for variable cooking powers. (Oven operates I I I I 1

properly at HIGH)

Oven does not cook properly when programmed

in EASY DEFROST cooking mode.

CONV indicator light, but oven does not go into

a cook cycle when START pad is touched.

ZONVECTION) CONV indicator light, but heating element does

not heat

Temperature in the oven cavity is lower or higher

than preset.

Convection cycle runs 1 minute then shuts

down. I I I I I I

Convection cycle runs 3 minutes then shuts 1 1 1 1 1 1

I down. I I I I I I

SENSOR) Oven is in the sensor cooking condition but AH

sensor does not end 1st stage or does not stop

cooking cycle or the oven stops soon.

R-9200

RE = Replace / CK = Check

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R-9ZOO

TEST PROCEDURES

PROCEDURE

LETTER COMPONENT TEST

A MAGNETRON TEST

’ NEVER TOUCH ANY PART IN THE CIRCUIT WITH YOUR HAND OR AN INSULATED

TOOL WHILE THE OVEN IS IN OPERATION. -1

-----

CARRY OUT 3D CHECKS

Isolate the magnetron from the high voltage circuit by removing all leads connected to the filament

terminal.

To test for an open circuit filament use an ohmmeter to make a continuity test between the

magnetron filament terminals, the meter should show a reading of less than 1 ohm.

To test for a short circuit filament to anode condition, connect ohmmeter between one of the fil-

ament terminals and the case of the magnetron (ground). This test should be indicated an infinite

resistance. If a low or zero resistance reading is obtained then the magnetron should be re

(R lz laced.

82AOl U)

MICROWAVE OUTPUT POWER (2 liter water load)

The following test procedure should be carried out with the microwave oven in a fully assembled

condition (with outer case fitted). Microwave output power from the magnetron can be measured

by way of substitution, i.e. it can be measured by using a water load how much it can be absorbed

by the water load. To measure the microwave output power in the microwave oven, the relation

of calorie and watt is used. When P(W) heating works for t(second), approximately P x t/4.2

calorie is generated. On the other hand, if the temperature of the water with V(ml) rises AT

(“C) during this microwave heating period, the calorie of the water is V x AT.

The formula is as follows;

P x t / 4.2 = V x AT P (W) = 4.2 x V x AT/t

Our condition for the water load is as follows:

Room temperature .....................around 20°C Power supply Voltage .............Rated voltage

Water load ......2000 ml Initial temperature .......1O+ 1“C Heating time ...... 1min. 45 sec.

P=80xAT

Measuring method:

A) Use two 1 litre Pyrex beakers with a diameter of approximately of 12cms.

B) Place 1 litre of 10°C water in each beaker.

C) Mark Tl on the one beaker and mark T2 on the other one. And stir the water and measure the

temperature of water the thermometer and note them. The graduation of the thermometer must

be scaled by 0.1“C at minimum and an accurate mercury thermometer is recommended.

D) Place the two beakers as touching each other in the centre of the cavity.

E) Set the timer to 1minute and 45 seconds, at 100% power (the time required to raise the water

temperature 10 degrees C.)

F) The time must be measured with stopwatch or wristwatch.

G) After 1minute and 45 seconds, stop the oven by opening the door.

H) Remove the two beakers from the oven and measure the temperature of the water by stiring the

water with the thermometer and noting the readings.

Example

Initial temperature ............................................................................... Tl = 10°C T2 = 11 “C

Temperature after 1min. 45 set . ........................................................ Tl = 20°C T2 = 21 “C

Temperature difference Cold-Warm s.......................................... AT1 = 10°C AT2 = 10°C

Mean temperature rise AT ........ AT = (AT1 +AT2) / 2 = (IO’C + IO’C) / 2 = 10°C

Measured output power

The equation is “P= 80 x AT” *.........t....*.*................................. P= 80 x 10°C = 800 Watts

NOTE: The measured output power should be at least +I5 % of the rated output

power.

CAUTION: 1“C CORRESPONDS TO 80 WATTS.

REPEAT MEASUREMENT IF THE POWER IS INSUFFICIENT.

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