Sharp R-4H10 Service Manual

SHARP SERVICE MANUAL

S8805R4HlOJ//

MICROWAVE OVEN

MODEL R-4H10

In the interests of user-safety the set should be restored to its orIgInal
condition and only parts identical to those specified should be used.

(RDl6101U)

This is a supplemental Service Manual for Model R-4HlO.
This model ia quite similar to Base Model R-4AlO (Refer No. is S7804R4AlOJ//).
The control panel of Model R-4HlO is quite similar to Base Model R-7380 (Refer No. is S7704R7380J//).

Use this supplemental manual togther with the Base Model Service Manual.
Refer to the Base Model Service Manual for comolete ooeration. service information, etc.

TABLE OF CONTENTS

Page

FOREWORD

...................................................................

1

CAUTION, MICROWAVE RADIATION.

................................................

1

PRODUCTDEACRIPTION

..........................................................

2

OPERATION

...................................................................

4

SERVICING

.....................................................................

6

COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE.

.............................

7

PICTORIAL DIAGRAM.

...........................................................

8

CONTROLPANELCIRCUIT

........................................................

9

PRINTEDWIRINGBOARD

........................................................

10

PARTSLIST .................................................................. 11

PACKINGANDACCESSORIES

.....................................................

17

SHARPCORPORATION

R-4HlO

R-4H10

SERVICE MANUAL

SHARF=

MICROWAVE OVEN

R-4HlO

FOREWORD

This Manual has been prepared to provide Sharp Corp. Service
Personnel with complete Operation and Service Information for the
SHARP MICROWAVE oven, R-4HlO.

The Model R-4H 10 is quite similar to Base Model R-4AlO (Refer

No. S7804R4AlOJ//).

it is recommended that service personnel carefully study the
entire text of this manual and Base Model manual, so they will
be qualified to render satisfactory customer service.

Check interlock switches and door seal carefully. Special at­tention should be given to avoid electrical shock and microwave
radiation hazard.

(RD36’02Ul

PRODUCT DESCRIPTION

A

SERVICING

CAUTION

MICROWAVE RADIATION

COMPONENT REPLACEMENT
AND ADJUSTMENT

~~~~~~~~

: ‘j?”

’ *.

PROCEDURE

*<xi;: ?&p

4,: y * $“‘

e&-a w+> &‘&,&

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,fianges

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.

Note( Parts List)

: The parts marked r,*t are used in voltage
more than 25OV.

(R036202U)

SHARPCORPORATtON

OSAKA, JAPAN

PICTORIAL DIAGRAM

PARTS LIST

CR037201 U)

R4HlO

PRODUCT DESCRIPTION

EXPLANATION OF MICROWAVE COOKING

r !>t: 5 na:p Microwave Oven uses microwave energy to

i

:):0(1uct>

Ileat In the food to be cooked. Unlike con-

t,~?‘!iI~111ij~

ovens microwave energy will cook foods

?nf!lhr~;il ;,pplvirtg external heat.

‘VI~crow:‘rves, which are short electromagnetic waves
ut RF (vdio frequency) energy, pass through materials
such ~35 glass. paper, china and most plastics. Materi­;11s such as metal and aiuminum foil tend to reflect
mt::rr,waves and may be used only as recommended In
the cooking rnstructrons.

Materials wtth a high

moisture content, like most foods, w,,, absorb micro­wave energy. As the microwave energy at a frequency
of 2450 Megahertz enters the food, the molecules align
themselves with the energy. Because he microwaves
are changing polarity every half cyck the food moie­cules are changing direction every half cycle or oscil­lating back and forth 4,900,000.000 times per second.
This high speed oscillation causes friction between the
molecules, thereby converting the microwave energy
to heat.

(RD41101U)

ITEM

Power Requirements

Power Consumptron
Power Output

Case Dtmenston5

‘CCiOklfl$j Cavity Dimensions

Confroi Comnlement

Set ‘viieig ht

T­T

c

I

i

1

!
/

7

/
I

i

/
/

I

/

I
1

I
I

i

SPECIFICATION

DESCRIPTION

240 Volts

50 Hertz
Single phase, 3 wire earthed

13oow

650 watts nomrnai of RF microwave energy (2 iiter water load)
Operating frequency of 2450M Hz

Width 520 mm

Height 318 mm including foot
Depth 393 mm

Width 345 mm

Height 217 mm
Depth 364 mm

Touch Control System
Timer (0 - 99 min 99 sec. )

Microwave Power for Variable Cooking

Repetttion Rate;

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

MED HIGH ,... _........ . . . . . . . . . . . . . . . . .._..........

approx. 70% of Full Power

M ED . . .._..__..... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

approx. 50% of Full

Power

MED LOW DEFROST

. . . . . . . . . . . . . . . . . . . . . . . . . . approx. 30% of Full Power

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

AUTO/SENSOR COOK

!NSTANT COOK/START pad
AUTO START/CLOCK pad
EASY DEFROST
ONE TOUCH REHEAT pad
MORE( A )/LESS{ r) pads

Approx. 17.5 kg

(RD44101

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

2

R4HlO

OVEN DIAGRAM

1. Ventilation openings

2. Oven lamp

3. Oven door with see through window

4. Removable turntable

5. Roller Stay

6. Hinges

Touch Control Panel

7. Door latches

8. Door open button

9. Touch Control Panel

10. Digital readout

11. Waveguide cover

12. Access cover for oven lamp replacement

AUTO/SENSOR COOK

AUTO/SENSOR COOK

1. Jacket potatoes

Touch to select Fresh or Frozen foods in Auto/Sensor

10. Vegetables

2. Roast be!

11. Chicken pieces

modes.

3. Roaat iamb

12 Fish fillets

4. Roast chicken

13. Casserole

AUTO/SENSOR COOK MENUS

5. Roast pork

14. Bacon

6. Roast turkey

15. Rce B Pas:a

ONE TOUCH REHEAT PAD

7. Corned meats

8. Scrambled e99s

Touch to start automatic reheat cycle.

9. stewed fruit

Touch to defrost meat by entering weight.

-NUMBER PADS
Touch to enter cooking, clock and memory times, weight
of food, or to select the Auto/Sensor Cook menus.

I

STOP/CLEAR PAD

Touch to erase during programming.
Touch once to stop operation of oven; touch twice to cancel
cooking programme during cooking.

r-

AUTO START/CLOCK PAD

i

Touch to set clock or Auto Start time.

r- VARIABLE COOKING CONTROL PADS

AUTO START

Touch to select microwave power setting.
If not touched, HIGH is automatically selected.

Touch to increase/decrease the time in one minute
increments during cooking or to increase/decrease the time
while programming the Auto/Sensor Cook, Easy Defrost or

MEMORY

0

1-1 One Touch Reheat modes.

INSTANT COOK/START PAD

Touch once to cook for 1

minute at HIGH or increase by

1 minute multiples each time this pad is touched during

cooking.
Touch to start oven after setting programmes.

i

MEMORY

Touch to enter one frequently used cooking programme.
Touch to recall the memorized programme.

3

R-4HlO

SENSOR COOKING CONDITION

Cooking Sequence.

Using the SENSOR COOK function, the foods are
cooked without figuring time, power level or quantity.
When the oven senses enough steam from the food, it
relays the information to its microprocessor which will
calculate the remaining cooking time and power level
needed for best results.

When the food is cooked, water vapor is developed.
The sensor “senses” the vapor and its resistance in­creases gradually. When the resistance reaches the
value set according to the menu, supplementary cook-

ing is started.

The time of supplementary cooking is determined by
experiment with each food category and inputted into
the LSI.
An example of how sensor works:

1. Potatoes at room temperature.

Vapor is emitted very slowly.

2. Heat potatoes. Moisture and humidity is emitted
rapidly. You can smell the aroma as it cooks.

1.

Touch SENSOR COOK pad.
NOTE:The oven should not be operated on SEN-

SOR COOK immediately after slugging in
the unit. Wait five minutes ’

fre cooking

on SENSOR COOK.

2.

Select desired Sensor setting.

3.

Touch START pad.

4.

The coil of shut-off relay (RY-1) is energized, the
oven lamp and cooling fan motor are turned on,
but the power transformer is not turned on.
After about 16 seconds, the cook relay (RY-2) is
energized. The power transformer is turned on,
microwave energy is produced and first stage is
started.
The 16 seconds is the cooling time required to re­move any vapor from the oven cavity and sensor.
NOTE: During this first stage, do not open the door

5.

6.

7.

or touch STOP/CLEAR pad.
When the sensor detects the vapor emitted from the
food, the display switches over to the remaining
cooking time and the timer counts down to zero.
At this time, the door may be opened to stir food,
turn it or season, etc.
When the timer reaches zero, an audible signal
sounds. The shut-off relay and cook relay are
de-energized and the power transformer, oven
lamp, etc. are turned off.
Opening the door or touching the STOP/CLEAR
pad, the time of day will reappear on the display
and the oven will revert to an OFF condition.

( RD71603U)

3. Sensor detects moisture and humidity and calcu­iates cooking time and variable power.