Sharp SMD2499FS User manual

1
SMD2499FS
S11M442SMD249
CONVECTION MICROWAVE DRAWER MODEL
SERVICE MANUAL
TABLE OF CONTENTS
Page
PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO
AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY..................... INSIDE FRONT COVER
BEFORE SERVICING ....................................................................................................... INSIDE FRONT COVER
WARNING TO SERVICE PERSONNEL................................................................................................................. 3
MICROWAVE MEASUREMENT PROCEDURE..................................................................................................... 4
FOREWORD AND WARNING ............................................................................................................................... 5
PRODUCT SPECIFICATIONS ............................................................................................................................... 6
SCHEMATICS ...................................................................................................................................................... 12
REMOTE CONNECTION PROBLEMS.................................................................................................................13
TROUBLE SHOOTING GUIDE.............................................................................................................................14
TEST PROCEDURES.......................................................................................................................................... 16
MICROWAVE DRAWER DISASSEMBLY............................................................................................................. 27
WIRING DIAGRAMS ............................................................................................................................................ 41
PARTS LIST ......................................................................................................................................................... 43
PACKING AND ACCESSORIES .......................................................................................................................... 50
This document has been published to be used for after sales service only. The contents are subject to change without notice.
SHARP ELECTRONICS CORPORATION
SMD2499FS
In the interest of user-safety the unit should be restored to its original condition and only parts identical to those specified should
be used.
WARNING TO SERVICE PERSONNEL:
This service manual is intended for use by persons having electrical and mechanical training and a level
of knowledge of these subjects generally considered acceptable in the appliance repair trade. SHARP
ELECTRONICS CORPORATION cannot be responsible, nor assume any liability, for injury or damage of any
kind arising from the use of this manual.

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SMD2499FS
PRECAUTIONS TO BE OBSERVED BEFORE AND
DURING SERVICING TOAVOID POSSIBLE EXPOSURE
TO EXCESSIVE MICROWAVE ENERGY
(a) Do not operate or allow the oven to be operated with the door open.
(b) Make the following safety checks on all ovens to be serviced before activating the magnetron or other microwave
source, and make repairs as necessary: (1) interlock operation, (2) proper door closing, (3) seal and sealing
surfaces (arcing, wear, and other damage), (4) damage to or loosening of hinges and latches, (5) evidence of
dropping or abuse.
(c) Before turning on microwave power for any service test or inspection within the microwave generating compart-
ments, check the magnetron, wave guide or transmission line, and cavity for proper alignment, integrity, and
connections.
(d) Any defective or misadjusted components in the interlock, monitor, door seal, and microwave generation and
transmission systems shall be repaired, replaced, or adjusted by procedures described in this manual before
the oven is released to the owner.
(e) A microwave leakage check to verify compliance with the Federal Performance Standard should be performed
on each oven prior to release to the owner.
BEFORE SERVICING
Before servicing an operative unit, perform a microwave emission check as per the Microwave Measure-
ment Procedure outlined in this service manual.
If microwave emissions level is in excess of the specified limit, contact SHARP ELECTRONICS
CORPORATION immediately @1-800-237-4277.
TO ACCESS INTERNET: http://www.sharpusa.com/Support.aspx
If the unit operates with the door open, service person should 1) tell the user not to operate the oven
and 2) contact SHARP ELECTRONICS CORPORATION and Food and Drug Administration's Center for
Devices and Radiological Health immediately.
Service personnel should inform SHARP ELECTRONICS CORPORATION of any certified unit found with
emissions in excess of 4mW/cm2. The owner of the unit should be instructed not to use the unit until the
oven has been brought into compliance.

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SMD2499FS
WARNING TO SERVICE PERSONNEL
Microwave Oven units contain circuitry capable of producing very high voltage and current,
contact with following parts
may result in a severe, possibly fatal, electrical shock.
(Example)
High Voltage Capacitor, High Voltage Power Transformer, Magnetron, High Voltage Rectifier
Assembly, High Voltage Harness, Heating Elements, etc..
Read the Service Manual carefully and follow all instructions.
Before Servicing
1. Disconnect the power supply cord , and then
remove cabinet.
2. Open the drawer and keep it open.
3. Discharge high voltage capacitor.
WARNING: RISK OF ELECTRIC SHOCK.
DISCHARGE THE HIGH-VOLTAGE
CAPACITOR BEFORE SERVICING.
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 the connecting lead of the
high-voltage rectifier) against the chassis with the use of
an insulated screwdriver.
Whenever troubleshooting is performed the power supply
must be disconnected. It may, in some cases, be necessary
to connect the power supply after the outer case has been
removed, in this event:
1. Disconnect the power supply cord, and then remove
neccessary covers.
2. Open the drawer and keep it open.
3. Discharge high voltage capacitor.
4. Disconnect the leads to the primary of the power
transformer.
5. Ensure that the leads remain isolated from other
components and oven chassis by using insulation tape.
6. After that procedure, reconnect the power supply cord.
When the testing is completed,
1. Disconnect the power supply cord, and then remove
covers.
2. Open the drawer and keep it open.
3. Discharge high voltage capacitor.
4. Reconnect the leads to the primary of the power
transformer.
5. Reinstall the covers.
6. Reconnect the power supply cord.
7. Run the unit and check all functions.
After repairing
1. Reconnect all leads removed from components during
testing.
2. Reinstall the covers.
3. Reconnect the power supply cord.
4. Run the oven and check all functions.
Microwave ovens should not be operated empty. To test for
the presence of microwave energy within a cavity, place a
cup of cold water on the oven tray, close the drawer and
set the power to HIGH and set the microwave timer for two
(2) minutes. When the two minutes has elapsed (timer at
zero) carefully check that the water is now hot. If the water
remains cold carry out Before Servicing procedure and
re-examine the connections 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 should be carried out.

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SMD2499FS
MICROWAVE MEASUREMENT PROCEDURE
A. Requirements:
1) Microwave leakage limit (Power density limit): The power density of microwave radiation emitted by a microwave
oven should not exceed 1mW/cm2at any point 5cm or more from the external surface of the oven, measured prior to
acquisition by a purchaser, and thereafter (through the useful life of the oven), 5 mW/cm2at any point 5cm or more
from the external surface of the oven.
2) Safety interlock switches:
Primary interlock relay switch shall prevent microwave radiation emission in excess of the requirement as above
mentioned. Secondary interlock relay and door sensing switch shall prevent microwave radiation emission in excess of
5 mW/cm2 at any point 5cm or more from the external surface of the oven.
B. Preparation for testing:
Before beginning the actual measurement of leakage, proceed as follows:
1) Make sure that the actual instrument is operating normally as specified in its instruction booklet.
Important:
Survey instruments that comply with the requirement for instrumentation as prescribed by the performance standard for
microwave ovens, 21 CFR 1030.10(c)(3)(i), must be used for testing.
2) Place the load of 275±15 ml (9.8 oz) of tap water initially at 20±5O C (68OF) in the center of the oven cavity.
The water container shall be a low form of 600 ml (20 oz) beaker with an inside diameter of approx. 8.5 cm (3-1/2 in.)
and made of an electrically nonconductive material such as glass or plastic.
The placing of this standard load in the oven is important not only to protect the oven, but also to insure that any leakage
is measured accurately.
3) Set the cooking control on Full Power Cooking Mode.
4) Close the drawer and select a cook cycle of several minutes. If the water begins to boil before the survey is completed,
replace it with 275 ml of cool water.
C. Leakage test:
Closed-drawer leakage test (microwave measurement):
1) Grasp the probe of the survey instrument and hold it perpendicular to the gap between the drawer and the body of the
oven.
2) Move the probe slowly, not faster than 1 in./sec. (2.5 cm/sec.) along the gap, watching for the maximum indication on
the meter.
3) Check for leakage at the drawer screen, sheet metal seams and other accessible positions where the continuity of the
metal has been breached (eg., around the switches, indicator, and vents).
While testing for leakage around the drawer, pull the drawer away from the front of the oven as far as is permitted by
the closed latch assembly.
4) Measure carefully at the point of highest leakage and make sure that the highest leakage is no greater than 4mW/cm2,
and that the primary interlock switch/secondary interlock relay does turn the oven OFF before any door movement.
NOTE: After servicing, record data on service invoice and microwave leakage report.

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SMD2499FS
SHARP ELECTRONICS CORPORATION
100 PARAGON DRIVE
MONTVALE NJ 07645
http://www.sharpusa.com/
SERVICE MANUAL
CONVECTION MICROWAVE DRAWER
SMD2499FS
FOREWORD
This Manual has been prepared to provide Sharp Electronics Corp. Service Personnel and Service Information for the
CONVECTION MICROWAVE DRAWER.
It is recommended that service personnel carefully study the entire text of this manual so that they will be qualified to
render satisfactory customer service.
Check the interlock switches and the door seal carefully. Special attention should be given to avoid electrical shock and
microwave radiation hazard.
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 personnel.
DANGER
Certain initial parts are intentionally not grounded and present a risk of electrical shock only during servic-
ing. Service personnel - Do not contact the following parts while the appliance is energized;
High Voltage Capacitor, Power Transformer, Magnetron, High Voltage Rectier Assembly, High Voltage
Harness;
If provided, Vent Hood, Fan assembly, Cooling Fan Motor.
All the parts marked “*” on parts list are used at voltages more than 250V.
Removal of the outer wrap gives access to voltage above 250V.
All the parts marked “ ” on parts list may cause undue microwave exposure, by themselves, or when they are dam-
aged, loosened or removed.
∆

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SMD2499FS
ITEM DESCRIPTION
Power Requirements 120 Volts (USA)
14.2 Amperes (Microwave) / 13.0 Amperes (Convection)
60 Hertz / Single phase, 3 wire grounded
Microwave Power Output 900 watts (IEC 705 Test Procedure)
Operating frequency of 2450MHz
Power Consumption Microwave - 1700 W Convection - 1560 W
Convection Power Output 1450 Watts
Case Dimensions Width 23 12/32" Height 19 20/32" Depth 22 8/32"
Cooking Cavity Dimensions
(1.4 Cubic Feet ) Width 16 30/32" Height 8 24/32" Depth 16 22/32"
Control Complement Touch Control System
Timer (0 - 99 min. 99 seconds)
Microwave Power for Variable Cooking
Repetition Rate;
P-HI........................................... Full power throughout the cooking time
P-90.............................................................. approx. 90% of Full Power
P-80.............................................................. approx. 80% of Full Power
P-70.............................................................. approx. 70% of Full Power
P-60.............................................................. approx. 60% of Full Power
P-50.............................................................. approx. 50% of Full Power
P-40............................................................... approx. 40% of Full Power
P-30 .............................................................. approx. 30% of Full Power
P-20.............................................................. approx. 20% of Full Power
P-10............................................................... approx. 10% of Full Power
P-0.............................................. No power throughout the cooking time
Convection Operation
TOP CONVECTION ................................... 1000 W
GRILL CONVECTION.... ............................ 500 W x 3 - TTL 1500 W
REAR.......................................................... 1500 W
Convection:
Bake/Warm, Roast, Grill/Toast, More Menus, Speed Cook, Air Fry
Microwave:
Popcorn, Reheat, Cook, More Menus, Defrost, Open/Close, Stop/Clear,
Start/+30 sec, Power Level, Timer/Settings, Number Keys with Convection
Temp settings.
Oven Cavity Light LED x 2
Remote Start Wi-Fi connect by way of "Sharp Kitchen" App.
Weight 128 lbs
Safety Standard UL Listed FCC Authorized
DHHS Rules, CFR, Title 21, Chapter 1, Subchapter J
CONVECTION MICROWAVE DRAWER SPECIFICATION

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SMD2499FS
GROUNDING INSTRUCTIONS
This oven is equipped with a three prong grounding plug. It must be plugged into a wall receptacle that is properly installed
and grounded in accordance with the National Electrical Code and local codes and ordinances.
In the event of an electrical short circuit, grounding reduces the risk of electric shock by providing an escape wire for the
electric current.
WARNING: Improper use of the grounding plug can result in a risk of electric shock.
Electrical Requirements
The electrical requirements are a 120 volt 60 Hz, AC only, 15 or 20 amp. fused electrical supply. It is recommended that a
separate circuit serving only this appliance be provided. When installing this appliance, observe all applicable codes and
ordinances.
Where a two-pronged wall-receptacle is encountered, it is the personal responsibility and obligation of the customer to con-
tact a qualified electrician and have it replaced with a properly grounded three-pronged wall receptacle or have a grounding
adapter properly grounded and polarized. If an extension cord must be used, it should be a 3-wire, 15 amp. or higher rated
cord. Do not drape over a counter top or table where it can be pulled on by children or tripped over accidentally.
CAUTION: DO NOT UNDER ANY CIRCUMSTANCES CUT OR REMOVE THE ROUND GROUNDING PRONG FROM THIS PLUG.
ALSO, "DO NOT USE AN EXTENSION CORD".
3
-Pronged
P
lug
Grounded
Receptacle Box
Grounding Pin
3-Pronged Receptacle
GENERAL INFORMATION

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SMD2499FS
NOTE:
The "START/+30 SEC" feature is disabled after 3 minutes when the oven is not in use. This feature is automatically
enabled when the door is opened and closed.
OVEN DIAGRAM
KEY SHEET
3
4
1
2
15
13
14
12
7
5
8
6
10
11
9
The label is located at the bottom left side of the oven face
plate.
6 Drawer sealing surfaces
7 Drawer lights
1 Easy Wave Open indicator
2 Wi-Fi indicator
3 Hidden control panel door
4 Easy Wave Open sensor
5 Nameplate: Open the Convection Microwave Drawer fully.
8 Convection Microwave Drawer guides
9 Hand holes
10 Vent
11 Menu labels
12 Glass touch control
13 Easy Wave Open button
14 Wi-Fi Connect button
15

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SMD2499FS
OPERATION
DESCRIPTION OF OPERATING SEQUENCE
The following is a description of component functions during
oven operation.
OFF CONDITION
Closing the door activates the door sensing switch and
primary interlock switch. (In this condition, the monitor switch
contacts are opened.)
When oven is plugged in, 120 volts A.C. is supplied to the
control unit. (Figure O-1).
1. The display will show "ENJOY YOUR OVEN TOUCH
CLEAR".
To set any program or set the clock, you must first touch the
STOP/CLEAR pad.The display will clear, and " :" will appear.
NOTE: When the door is opened, the oven lamp comes on.
2. A signal is input to the control unit, energizing the coil
of shut-off relay (RY-11 and RY-12). RY-11 and RY-12
contacts close, completing a circuit to the damper motor.
The damper motor now operates moving the damper to the
open position, thereby closing the contacts of the damper
switch inputs a signal to the control unit. The coil of relay
RY-11 and RY-12 is de-energized, opening its contacts,
there by turning off the damper motor.
MICROWAVE COOKING CONDITION
Program desired cooking time Variable Cooking Control by
touching the NUMBER pads and the power level pad.
When the START pad is touched, the following operations
occur:
When the START pad is touched, the following operations
occur:
1. The contacts of relays are closed, and components
connected to the relays are turned on as follows.
RELAY CONNECTED COMPONENTS
RY1 High voltage transformer and all heating elements
RY2 High voltage transformer
RY9 Stirrer motor
RY10 Fan motor
RY14 MG Fan motor
2. 120 volts A.C. is supplied to the primary winding of the
power transformer and is converted to about 3 volts A.C.
output on the filament winding, and approximately 2360
volts A.C. on the high voltage winding.
3.The filament winding voltage heats the magnetron filament
and the H.V. winding voltage is sent to a voltage double
circuit.
4. The microwave energy produced by the magnetron is
channeled through the waveguide into the cavity feedbox,
and then into the cavity where the food is placed to be
cooked.
5.Upon completion of the cooking time, the power transformer,
oven lamp, etc. are turned off, and the generation of
microwave energy is stopped. The oven will revert to the
OFF condition.
6. When the door is opened during a cook cycle, third door
switch (only Canada model), monitor switch, door sensing
switch, the secondary interlock relay and the primary
interlock switch are activated with the following results.
The circuits to the stirrer motor and the high voltage
components are de-energized, the oven lamp remains
on, and the digital read-out displays the time remaining
in the cook cycle when the door was opened.
7. The monitor switch is electrically monitoring the operation
of the secondary interlock relay (RY1) and the primary
interlock switch and is mechanically associated with the
door so that it will function in the following sequence:
(1) When the door opens from a closed position, the door
sensing switch and the primary interlock switch open their
contacts, and then the monitor switch contacts close and then
the third door switch (only Canada model) contacts open.
(2) When the door is closed from the open position, the
monitor switch contacts open, and the third door switch (only
Canada model) contacts close first, and then the contacts of
the primary interlock switch and the door sensing switch close.
If the secondary interlock relay (RY1) and the primary interlock
switch fail with their contacts closed when the door is opened,
the closing of the monitor switch contacts will form a short
circuit through the monitor fuse, the secondary
interlock relay (RY1) and the primary interlock switch, causing
the monitor fuse to blow.
POWER LEVEL P-0 TO P-90 COOKING
When Variable Cooking Power is programmed, the 120 volts
A.C.is supplied to the power transformer intermittently through
the contacts of relay (RY-1). RY-1 is operated by the control
unit within a varying time base. Microwave power operation
is as follows:
VARI-MODE ON TIME OFF TIME
Power 10(P-HI) 32 sec. 0 sec.
(100% power)
Power 9(P-90) 30 sec. 2 sec.
(approx. 90% power)
Power 8(P-80) 26 sec. 6 sec.
(approx. 80% power)
Power 7(P-70) 24 sec. 8 sec.
(approx. 70% power)
Power 6(P-60) 22 sec. 10 sec.
(approx. 60% power)
Power 5(P-50) 18 sec. 14 sec.
(approx. 50% power)
Power 4(P-40) 16 sec. 16 sec.
(approx. 40% power)
Power 3(P-30) 12 sec. 20 sec.
(approx. 30% power)
Power 2(P-20) 8 sec. 24 sec.
(approx. 20% power)
Power 1(P-10) 6 sec. 26 sec.
(approx. 10% power)
Power 0(P-0) 0 sec. 32 sec.
(0% power)
Note: The ON/OFF time ratio does not correspond with the
percentage of microwave power, because approx. 2 seconds
are needed for heating of the magnetron lament.

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SMD2499FS
HEATER (BAKE/ROAST/GRILL) COOKING CONDITION
"PREHEATING CONDITION"
Program desired convection temperature by touching the
BAKE/ROAST/GRILL pad and touch “1” key and the
Temperature pad.Program desired cooking time by touching
the Number pads.
(NON-PREHEATING COOKING: touch “2” key and the
temperature pad, and cooking time by touching number
key pads.)
When the START pad is touched, the following operations
occur:
1.The coil of shut-off relays (RY10 and RY14) are energized,
MG cooling fan motor and cooling fan motor are turned
on.Top convection motor is turned on also. But power of
this motor is DC24V. DC motor is not controlled by relay.
2.The coil of relay (RY11/RY12) is energized by the control
unit.The damper is moved to the closed position, closing
the damper switch contacts. The closing of the damper
switch contacts sends a signal to the LSI on the control
unit de-energizing the relay (RY11/RY12) and opening
the circuit to the damper motor.
3. The coil of heater relay (RY1, RY3, RY4 and RY7) is
energized by the control unit and the main supply voltage
is applied to the heating element.
4.When the oven temperature reaches the selected preheat
temperature, the following operations occur:
4-1 The heater relay is de-energized by the control unit
temperature circuit and top convection thermistor,
opening the circuit to the heating element.
4-2. The oven will continue to function for 20 minutes,
turning the heater on and off, as needed to maintain
the selected preheat temperature. The oven will
shut down completely after 20 minutes.
HEATER (BAKE/ROAST/GRILL) COOKING CONDITION
When the preheat temperature is reached, a beep signal will
sound indicating that the holding temperature has been
reached in the oven cavity. Open the door and place the
food to be cooked in the oven.
When the START pad is touched, the following operations
occur:
1. The numbers on the digital read-out start to count down
to zero.
2. The oven lamp, MG cooling fan motor, cooling fan motor
and convection motor are energized.
3.Heater relay (Note1) is energized (if the cavity temperature
is lower than the selected temperature) and the main
supply voltage is applied to the heating element to return
to the selected cooking temperature.
4. Upon completion of the cooking time, the audible signal
will sound, and oven lamp and convection motor are
de-energized. At the end of the convection cycle, if
the cavity air temperature is above 248°F, the circuit to
RY10/RY14 will be maintained (by the thermistor circuit)
to continue operation of the cooling fan motor until the
temperature drops below 221οF, at which time the relay
will be de-energized, turning off the fan motor. However,
as soon as the convection cycle has ended, turning off
the top convection fan motor.
5. At the end of the convection cook cycle, shut-off relay
(RY11/RY12) is energized turning on the damper motor.
The damper is returned to the open position, opening
the damper switch contacts which send a signal to the
control unit, de-energizing shut-off relay (RY11/RY12).
Note 1
Bake RY1, RY3, RY6
Roast RY1, RY3, RY4, RY7, or RY1, RY3, RY6
Grill RY1, RY3, RY5, RY8
SPEED COOKING CONDITION
Touch the Speed Cook pad first. And then program desired
cooking mode by touching the Number pads.
SENSOR COOKING CONDITION
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 increase
gradually. When the resistance reaches the value set
according to the menu, supplementary cooking 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 are emitted rapidly.
You can smell the aroma as it cooks.
3. Sensor detects moisture and humidity and calculates
cooking time and variable power.
MICROWAVE
MICROWAVE
AH SENSOR

11
SMD2499FS
Cooking Sequence.
1. Touch SENSOR COOK pad.
NOTE:
The oven should not be operated on SENSOR
COOK immediately after plugging in the unit.
Wait two minutes before cooking on SENSOR COOK.
2. Select desired Sensor setting.
3. Touch START pad.
The coil of shut-off relay (RY10, RY14) is energized,
the MG fan motor and cooling fan motor are turned on,
but the power transformer is not turned on.
4.After about 16 seconds, the cook relay (RY-1) 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 or touch
STOP/CLEAR pad.
5.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.
6. When the timer reaches zero, an audible signal sound.
The shut-off relay and cook relay are de-energized and
the power transformer, oven lamp, etc. are turned off.
7. 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.
EASY WAVE OPEN
Below are criteria for wave sensor to open drawer.
1. Motion sensor function requires 2 consecutive hand
waves.
2. Each hand wave must completely clear the motion
sensor view.
3. The second hand wave must be less than 2 sec interval
from the first hand wave.
4. The second hand wave must be more than 100ms
interval from the first hand wave.
5. Duration of each hand wave infront of the sensor view
must be less than 250ms.
6. The distance of hand should be less than 4 inches away
from surface of door. The effective distance is reduced
if skin color is darker. (For the best results, use the side
of the hand with the lightest skin pigments/color)

12
SMD2499FS SCHEMATIC (OFF CONDITION)

13
SMD2499FS
REMOTE CONNECTION PROBLEMS
Varify connection by performing the following steps:
1) Steps to reconnecting to the oven.
a) Verify that the "Sharp Kitchen" App is still installed on the phone and/or tablet.
1) Reinstall if missing and follow steps to connect to the Convection Microwave Drawer oven.
b) Open the "Sharp Kitchen" App and verify that you see the Convection Microwave Drawer oven connection.
1) Reconnect if you do not see the Convection Microwave Drawer oven
c) Check the Wi-Fi modem status is ok and that there is internet connection.
1) First check if there is internet connection.
2) If there is internet connection, check and see if the phone or tablet is connected to the Wi-Fi. Also, verify that
the correct Wi-Fi is connected.
3) If you do not see the Wi-Fi, try reconnecting and if this fails, you may have to reboot the modem.
d) Final steps to connect
1) If all the above fails, completely uninstall the "Sharp Kitchen" App .
2) Follow steps to connect per Quick Connect and/or Operation Manual.
3) If you still cannot connect by following the steps above, the Wireless Adapter may be defective and will have
to be replaced.
4) Before ordering the Wireless Adapter, contact Sharp Customer Service and explain why you are
having to order a new Wireless Adapter due to non-connection using the "Sharp Kitchen" App.
If the Convection Microwave Drawer is not working remotely, perform the following steps:
Check the Wi-Fi Software to see where the problem may be.
Use the following Test Mode for error check procedure:
Press the following buttons:
Stop/Clear - Timer/Settings - Power Level (2 times) - Start/+30 SEC, then press the #5 key to advance to each display
screen check. (Fig 1)
Each press of #5 key will show the below display in the LED screen when checking (Fig 2).
STEP 1
STEP 2
NOTE FOR TEST MODE: You have to press the #5 to advance to the
next display screen check.
Verify that the Wi-Fi indicator light is solid Blue.
1) If there is no Blue light, then there is a connection problem.
2) Try Step 1 below to see where the connection problem may be.
3) Refer to Page 18 for Indicator Lens and Color legend.
VER 021 Version #
L : 03 (strong), 02 (Middle), 01 (Weak), 00 (out of Service)
R : 00000 (larger this value, the stronger between Wi-Fi adapter & router)
Flash between : 3 00 & 0
Flash between : 0 0 & 0000
Flash between : 3 00 & 4
PC : 00000000 If anything else besides all zero’s - REPLACE WIRELESS ADAPTER PWB
WC : 00000000 If anything else besides all zero’s - ROUTER ERROR
CC : 00000000 If anything else besides all zero’s - CLOUD SERVER ERROR
NOTE: for PC, WC & CC, All ZERO’S EQUAL NO ERROR
Fig 1
Test results
here
Wi-Fi
indicator light
Fig 2
}N/A
Wave/Cooking
indicator light
Example only

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SMD2499FS
TROUBLESHOOTING GUIDE
Never touch any part in the circuit with your hand or an uninsulated tool while the power supply is connected.
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
(A ~ R) which will be found in the "Test Procedure "section (starting on Page 15).
IMPORTANT: If the oven becomes inoperative because of a blown monitor fuse, check the primary switch, and monitor
switch, before replacing the monitor fuse. If the monitor fuse is replaced, the monitor switch must also be
replaced.
IMPORTANT: Whenever troubleshooting is performed with the power supply cord disconnected. It may in, some cases,
be necessary to connect the power supply cord after the outer case has been removed, in this event,
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Disconnect the leads to the primary of the power transformer.
5. Ensure that the leads remain isolated from other components and oven chassis by using insulation tape.
6. After that procedure, reconnect the power supply cord.
When the testing is completed
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Reconnect the leads to the primary of the power transformer.
5. Reinstall the outer case (cabinet).
6. Reconnect the power supply cord after the outer case is installed.
7. Run the oven and check all functions.

15
SMD2499FS
TROUBLESHOOTING CHART
DISPLAY UNIT
during
ON

16
SMD2499FS
TEST PROCEDURES
PROCEDURE
LETTER COMPONENT TEST
A MAGNETRON ASSEMBLY TEST
HIGH VOLTAGES ARE PRESENT DURING THE COOK CYCLE, SO EXTREME CAUTION SHOULD BE
OBSERVED.
DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPONENTS OR
WIRING.
To test for an open filament, isolate the magnetron from the high voltage circuit. A continuity check across the
magnetron filament leads should indicate less than 1 ohm.
To test for a shorted magnetron, connect the ohmmeter leads between the magnetron filament leads and
chassis ground. This test should indicate an infinite resistance. If there is little or no resistance the magnetron
is grounded and must be replaced.
Power output of the magnetron can be measured by performing a water temperature rise test. This test should
only be used if above tests do not indicate a faulty magnetron and there is no defect in the following components
or wiring: silicon rectifier, high voltage capacitor and power transformer.This test will require a 16 ounce (453cc)
measuring cup and an accurate mercury thermometer or thermocouple type temperature tester. For accurate
results, the following procedure must be followed carefully:
1. Fill the measuring cup with 16 oz.(453cc) of tap water and measure the temperature of the water with
a thermometer or thermocouple temperature tester.Stir the thermometer or thermocouple through the
water until the temperature stabilizes. Record the temperature of the water.
2. Place the cup of water in the oven.Operate oven at POWER HI(HIGH) selecting more than 60 seconds
cook time.Allow the water to heat for 60 seconds, measuring with a stop watch, second hand of a watch
or the digital read-out countdown.
3. Remove the cup from the oven and again measure the temperature, making sure to stir the thermometer
or thermocouple through the water until the maximum temperature is recorded.
4. Subtract the cold-water temperature from the hot water temperature. The normal result should
be 22 to 43°F (12.2 to 23.8°C) rise in temperature. If the water temperatures are accurately
measured and tested for the required time period the test results will indicate if the magnetron tube has
low power output (low rise in water temperature) which would extend cooking time or high power output
(high rise in water temperature) which would reduce cooking time.Because cooking time can be adjusted
to compensate for power output, the magnetron tube assembly should be replaced only if the water
temperature rise test indicates a power output well beyond the normal limits. The test is only accurate
if the power supply line voltage is 117 volts and the oven cavity is clean.
B POWER TRANSFORMER TEST
DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPONENTS OR
WIRING.
Disconnect the primary input terminals and measure the resistance of the transformer with an ohmmeter. Check
for continuity of the coils with an ohmmeter. On the R x 1 scale, the resistance of the primary coil should be
less than 1 ohm and the resistance of the high voltage coil should be approximately 79.5 ohms; the resistance
of the filament coil should be less than 1 ohm.
(HIGH VOLTAGES ARE PRESENT AT THE HIGH VOLTAGE TERMINAL, SO DO NOT ATTEMPT TO
MEASURE THE FILAMENT AND HIGH VOLTAGE.)
C HIGH VOLTAGE RECTIFIER TEST
DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPONENTS OR
WIRING.
Isolate the rectifier from the circuit. Using the highest ohm scale of the meter, read the resistance across the
terminals and observe, reverse the leads to the rectifier terminals and observe meter reading. If a short is
indicated in both directions, or if an infinite resistance is read in both directions, the rectifier is probably defective
and should be replaced.

17
SMD2499FS
TEST PROCEDURES
PROCEDURE
LETTER COMPONENT TEST
D SENSOR
1. Make sure the Easy Wave Open (motion sensor function) is activated. When activated, the blue LED
indicator light unit turns ON when drawer door is closed.
2. Check sensor lens for foreign material.
3. Check if the control panel door is defective and sagging down lower than normal when open, which
could block the view of the sensor. Close the control panel door to ensure the control panel door is
not blocking the sensor and test again.
4. Check the connector and harness to the sensor to ensure they are secured properly and not broken.
5. Check for electrical parameters in the table below. If those conditions are met, then the display unit
is working properly.
(NOTE: If the voltage is uncertain, change display unit)
6. Check for electrical parameters in the table below. If those conditions are met, then the sensor and
display unit are working properly
With Sensor Unplugged EASY WAVE OPEN Activated or Not Activated
Connector pin connected to Sensor [VDC] - Approx.
Pin # 4 to Case
Ground 1.1 - 1.5 V
Pin # 5 to Case
Ground 1.1 - 1.5 V
Pin # 6 to Case
Ground 1.1 - 1.5 V
Pin # 7 to Case
Ground 0
With Sensor plugged in EASY WAVE OPEN Activated-With object infront of sensor
Connector pin connected to Sensor [VDC] - Approx.
Pin # 4 to Case
Ground 4.65 VDC for 2 seconds and returns back to 1.46 VDC
Pin # 5 to Case
Ground 4.9 VDC for 2 seconds and returns back to 1.5 VDC
Pin # 6 to Case
Ground 4.89 VDC for 2 seconds and returns back to 1.5 VDC
Pin # 7 to Case
Ground 0

18
SMD2499FS
DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPONENTS
OR WIRING.
If the capacitor is open, no high voltage will be available to the magnetron. Disconnect input leads and
check for short or open between the terminals using an ohmmeter.
Checking with a high ohm scale, if the high voltage capacitor is normal, the meter will indicate
continuity for a short time and should indicate approximately 10 MΩonce the capacitor is charged.
If the above is not the case, check the capacitor with an ohmmeter to see if it is shorted between either
of the terminals and case. If it is shorted, replace the capacitor.
INDICATORS LENS AND COLOR LEGEND
Isolate the switch and connect the ohmmeter to the common (COM.) and normally open (NO) terminal
of the switch. The meter should indicate an open circuit with the door open and a closed circuit with
the door closed. If improper operation is indicated, replace the switch.
DOOR SENSING SWITCH
Isolate the switch and connect the ohmmeter to the common (COM.) and normally open (NO) terminal
of the switch. The meter should indicate an open circuit with the door open and a closed circuit with
the door closed. If improper operation is indicated, replace the door sensing switch.
SECONDARY INTERLOCK RELAY
Disconnect two (2) wire leads from the tab terminal of the secondary interlock relay (RY1). Check the
state of the relay contacts using a ohmmeter. The relay contacts should be open. If the relay contacts
are closed, replace the circuit board entirely or the relay itself.
E HIGH VOLTAGE CAPACITOR TEST
F PRIMARY INTERLOCK SWITCH AND THIRD DOOR SWITCH TEST (CANADA MODELS ONLY)
G SECONDARY INTERLOCK SYSTEM TEST

19
SMD2499FS
J MONITOR SWITCH
TEST PROCEDURES
PROCEDURE
LETTER COMPONENT TEST
Disconnect the oven from power supply.
Before performing this test, make sure that the primary interlock switch and the secondary interlock
relay are operating properly, according to the above Test Procedures. Disconnect the wire lead from
the monitor switch (NC) terminal. Check the monitor switch operation by using the ohmmeter as follows.
When the door is open, the meter should indicate a closed circuit. When the monitor switch actuator
is pushed by a screw driver through the lower latch hole on the front plate of the oven cavity with the
door opened (in this condition the plunger of the monitor switch is pushed in), the meter should indicate
an open circuit. If improper operation is indicated, the switch may be defective. After testing the monitor
switch, re-connect the wire lead to the monitor switch (NC) terminal and check for continuity of monitor
circuit.
Ohmmeter
Screw Driver
Primary
Interlock
Switch
Monitor
Switch
Disconnect the leads from the terminals of the thermal cut-out. Then using an ohmmeter, make a
continuity test across the two terminals as described in the below.
K THERMAL CUT OUT TEST
Parts Name
Temperature of "ON"
condition (closed circuit).
(˚C)
Temperature of "OFF"
condition (open circuit).
(˚C)
Indication of ohmmeter
(When room temperature
is approx. 20˚C.)
Top convection Thermal
cut-out 210˚C
(On the top convection duct)
This is not resettable type Above 210˚C Closed circuit
Rear convection Thermal
cut-out 145˚C
(On the rear convection duct)
This is not resettable type Above 145˚C Closed circuit
Grill Thermal cut-out 145˚C
(On the cavity top plate front)
This is not resettable type Above 145˚C Closed circuit
Oven Thermal cut-out 125˚C
(On the exhaust duct)
This is not resettable type Above 125˚C Closed circuit
MG Thermal cut-out 125˚C
(On the magnetron)
This is not resettable type Above 125˚C Closed circuit
Table: Thermal Cut-out Test
If incorrect readings are obtained, replace the thermal cut-out.
An open circuit thermal cut-out (MG) indicates that the magnetron has overheated, this may be due
to redistricted ventilation, cooling fan failure.
An open circuit thermal cut-out (Grill ) indicates that the oven cavity has overheated, this may be due
to oven thermistor failure.
An open circuit thermal cut-out (Top convection) indicates that the top convection duct has overheated,
this may be due to top convection motor failure or top convection thermistor.
An open circuit thermal cut-out (Rear convection) indicates that the rear convection duct has overheated,
this may be due to rear convection motor failure or oven thermistor.
An open circuit thermal cut-out (Oven) indicates that the oven cavity has overheated, this may be due
to ignition in the cooking chamber.

20
SMD2499FS
Disconnect the leads from the terminals of the Noise Filter.
Using an ohmmeter, check between the terminals as described in the following table.
IF CORRECT READINGS ARE OBTAINED, REPLACE NOISE FILTER UNIT.
M NOISE FILTER TEST
If the fuse 20A is blown when the door is opened, check the primary interlock sw itch secondary
interlock relay and monitor switch.
If the monitor fuse (FUSE 20A) is blown by improper switch operation, the monitor fuse
and monitor switch must be replaced even if the monitor switch operates normally
CAUTION: Only replace fuse with the correct value replacement.
TEST PROCEDURES
PROCEDURE
LETTER COMPONENT TEST
L BLOWN MONITOR FUSE F20A
L(min) Cx ± 20% Cy ± 20%
1.0mH 1.0µF 0.0022µF
MEASURING POINTS INDICATION OF OHMMETER
Between N and L Open circuit
Between terminal N and WHITE Short circuit
Between terminal L and BLACK Short circuit
NOISE FILTER UNIT
NOISE SUPPRESSION COIL
LINE CROSS CAPACITOR 1.0 µF 275V
RESISTOR 470 K Ω 1/2W
LINE BYPASS CAPACITOR
LINE BYPASS CAPACITOR
0.0022 µF/ 250v
0.0022 µF/ 250v
TO LOAD TO LOAD
H
N
MONITOR
FUSE
“TO SOURCE” “TO SOURCE”