Sharp R-4H10 User 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 at-
tention 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*$“‘
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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 ~35glass. 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 micro-
wave 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 moie-
cules are changing direction every half cycle or oscil-
lating 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
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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. Roastturkey 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 in-
creases 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 re-
move 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 calcu-
iates cooking time and variable power.

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SERVICING
TROUBLESHOOTING GUIDE
When troubleshooting the microwave oven, It IS
helpful1 to follow the Sequence of Operatton in per- IMPORTANT. If the oven becomes erative be-
forming the checks. Many of the possible causes of cause of a blown moniror fuse tn tne
trouble will require that a specific test be performed. monitor switch and upper latch switch
ctrcuit, check the monitor SVL,I:C~ and
These tests are given a procedure letter which will be
found in the “Test Procedure”section.
upper latch switch befr 2 repiacing the
monitor fuse. firJ2-.P’
i _
PROBLEM POSSIBLE CAUSE TEST PROCEDURE OR
CORRECTION
I
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I COOKING CONDITION
/ EASY DEFROST condition touch-
j ing INSTANT COOK/START pad, Programmed incorrectly, EASY DEFROST
/ “ERROR” appears. i operate on a speclfirllje,ihn:Y
j Range for each food cate-
’ gory. See steps for EASY
1 DEFROST in operation man- 1
Defective control unit.
i ual.
I
j Procedure I.
SENSOR COOKING CONDITION
/ Oven is in the sensor cooking or Defective control unit. /
: ONE TOUCH REHEAT condition, : Procedure I.
but AH sensor does not stop AH SenSOr open and/or short, ’ Procedure J.
cooking cycle.
I Open or loose wire condition to the above 1 Check and repair wrrtng
components. I

FWHlO
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE
WP FINING: To avoid possible exposure to microwave
energy;
Before operating oven
1. Make sure that unlatching door slowly is ac-
companied by a click indicating actuation of
monitor switch and latch switch.
2. Check visually door seal for arcing and damage.
B. Do not operate oven until after repair if any of fol-
lowing conditions exist;
1. Door does not close firmly against front of ap-
pliance.
2.
3.
4.
5.
C. DC
1.
2.
There is a broken door hinge or support.
The door is bent or warped.
There is any defective parts in the latch, oven
door or microwave generating and transmission
assembly.
There is any other visible damage to oven.
not operate oven
Without the RF gasket.
If door is not closed. (RDA1204U)
POWER TRANSFORMER REMOVAL
1. Disconnect oven from power supply and remove 4. Disconnect filament leads from magnetron and high
outer case. voltage capacitor.
2. Discharge high voltage capacitor.
3. Disconnect wire leads from power transformer
5
6
Remove two (2) screws holding transformer to unit
chassis.
Remove power transformer.
NOTE:WHITE & BLUE WIRES (NEUTRAL) MUST BE
CONNECTED TO THE CABINET-SIDE TERMINAL
OF POWER TRANSFORMER.

FMHlO
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