R-404JK
SUPPLEMENTAL SERVICE MANUAL
S34M232R404JE
MICROWAVE OVEN
MODEL
R-404JK
R-404JK
This is a supplemental Service Manual for Microwave Oven model R-404JK. This model is quite similar to the base models
R408JK/JW; (S24M231R408JE).
This supplemental manual must be used in conjunction with the base model service manual for complete operation,
service, safety and replacement parts information.
In the interest of user-safety the oven should be restored to its original condition and only parts identical to those specified
should be used.
WARNING TO SERVICE PERSONNEL: Microwave ovens contain circuitry capable of producing very high voltage and
current, contact with following parts may result in a severe, possibly fatal, electrical shock. (High Voltage Capacitor,
High Voltage Power Transformer, Magnetron, High Voltage Rectifier Assembly, High Voltage Harness etc..)
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 .............................................................................................................. 1
MICROWAVE MEASUREMENT PROCEDURE .................................................................................................. 2
FOREWORD AND WARNING ............................................................................................................................. 3
PRODUCT SPECIFICATIONS ............................................................................................................................. 4
GENERAL INFORMATION ...................................................................................................................................4
KEY UNIT TEST ....................................................................................................................................................6
CPU UNIT CIRCUIT ...............................................................................................................................................7
PARTS LIST ..........................................................................................................................................................8
PACKING AND ACCESSORIES ......................................................................................................................... 12
SHARP ELECTRONCS CORPORATION
This document has been published to be used for after
sales service only.
The contents are subject to change without notice.
Service Headquarters: Sharp Plaza, Mahwah, New Jersey, 07430-2135
R- 404JK
PRECAUTIONS TO BE OBSERVED BEFORE AND
DURING SERVICING TO AVOID 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
compartments, 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 Measurement 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.
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.
R-404JK
WARNING TO SERVICE PERSONNEL
Microwave ovens 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 etc..
Read the Service Manual carefully and follow all
instructions.
Don't Touch !
Danger High Voltage
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.
Before Servicing
1. Disconnect the power supply cord
remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
, and then
WARNING:RISK OF ELECTRIC SHOCK.
DISCHARGE THE HIGH-VOLTAGE
CAPACITOR BEFORE SERVICING.
After repairing
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 highvoltage capacitor (that is the connecting lead of the highvoltage rectifier) against the chassis with the use of an
insulated screwdriver.
1. Reconnect all leads removed from components during
testing.
2. Reinstall the outer case (cabinet).
3. Reconnect the power supply cord after the outer case is
installed.
4. Run the oven and check all functions.
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
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.
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 turntable, close the door 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 reexamine 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.
1
R-404JK
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/cm2 at 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/cm2 at 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 oven tray in the oven cavity.
3) 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.
4) Set the cooking control on Full Power Cooking Mode.
5) Close the door 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-door leakage test (microwave measurement):
1) Grasp the probe of the survey instrument and hold it perpendicular to the gap between the door 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 door 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 door, pull the door 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.
2
R-404JK
SERVICE MANUAL
PRODUCT DESCRIPTION
MICROWAVE OVEN
R-404JK
GENERAL INFORMATION
FOREWORD
This supplemental Manual has been prepared to provide Sharp Electronics
Corp. Service Personnel with Operation and Service Information for the
SHARP MICROWAVE OVEN, R-404JK.
Model R-404JK, is quite similar to base models R-408JK/JW
(Ref.# S24M231R408JE).
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 no 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 servicing. Service personnel - Do not contact the following parts while the appliance is
energized;
High Voltage Capacitor, Power Transformer, Magnetron, High
Voltage Rectifier 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 damaged, loosened or
removed.
SHARP ELECTRONICS CORPORATION
SHARP PLAZA, MAHWAH,
NEW JERSEY 07430-2135
3
WIRING DIAGRAM
PARTS LIST
R-404JK
SPECIFICATION
ITEM
DESCRIPTION
PowerRequirements
120 Volts
14.0 Amperes, 1600 watts
60 Hertz
Single phase, 3 wire grounded
Power Output
1100 watts (IEC TEST PROCEDURE)
Operating frequency of 2450MHz
Case Dimensions
Width 21-11/16"
Height 12-3/8"
Depth 17-3/8"
Cooking Cavity Dimensions
Width 15
Height 9-7/16"
Depth 16-3/4"
1.3 Cubic Feet
Control Complement
Touch Control System
Clock ( 1:00 - 12:59 )
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
START, MINUTE PLUS pad, Cook pads, Defrost pads, Number selection pads,
Power Level pad, Timer/Clock pad,Stop/Clear pad, Reheat, Popcorn, Night light
and Short Cuts.
Oven Cavity Light
Yes
Safety Standard
UL Listed
FCC Authorized
DHHS Rules, CFR, Title 21, Chapter 1, Subchapter J
GENERAL INFORMATION
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.
A short power-supply cord is provided to reduce risks of becoming entangled in or tripping over a longer cord.
Where a two-pronged wall-receptacle is encountered, it is the personal responsibility and obligation of the customer to contact
4
R-404JK
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 the extension cord must be used, it should be
a 3-wire, 15 amp. or higher rated cord. Do not drape over a countertop
or table where it can be pulled on by children or tripped over accidentally.
Grounded
Receptacle Box
3-Pronged
Plug
CAUTION: DO NOT UNDER ANY CIRCUMSTANCES CUT OR REMOVE THE ROUND GROUNDING PRONG FROM THIS
PLUG.
Grounding Pin
3-Pronged Receptacle
OVEN DIAGRAM
1. One touch door open button.
Push to open door.
2. Door latches.
The oven will not operate unless the
door is securely closed.
3. Removable turntable support.
4. Removable turntable.
The turntable will rotate clockwise or
counterclockwise.
5. Oven lamp.
It will light when oven is operating or
door is opened.
6. Oven door with see-through window.
7. Ventilation openings. (Rear)
8. Auto-Touch control panel.
9. Time display: Digital display, 99
minutes 99 seconds.
5
6
7
9
11
8
2
10
1
4
3
10. Wave guide cover.
11. Power supply cord
TOUCH CONTROL PANEL
NOTE:
The directed features are disabled after one minute when the
oven is not in use. These features
are automatically enabled when
the door is opened and closed or
the STOP/ CLEAR pad is pressed.
R-404JK
5
R-404JK
TEST PROCEDURES
PROCEDURE
LETTER
J
Disconnect the power supply cord, and then remove outer case.
Open the door and block it open.
Discharge high voltage capacitor.
Using an ohmmeter and referring to the key unit matrix indicated on the control unit circuit, check the
circuit between the pins of the key unit that correspond to the STOP/CLEAR pad. When the pad is
pressed, the ohmmeter should indicate short circuit. When the pad is released, the ohmmeter should
indicate open circuit. If incorrect readings are obtained, the key unit is faulty and must be replaced.
About the other pads, the above method may be used.
Reconnect all leads removed from components during testing.
Re-install the outer case (cabinet).
Reconnect the power supply cord after the outer case is installed.
Run the oven and check all functions.
G7
G6
G5
G4
G3
G2
START
WARM
TIMER
CLOCK
STOP
CLEAR
POWER
LEVEL
9
G1
G11
G10
G9
G8
DEFROST REHEAT
NIGHT
LIGHT
COOK
G12
5.
6.
7.
8.
KEY UNIT TEST
G13
1.
2.
3.
4.
COMPONENT TEST
Pin
NO. G1
SOFTEN
MELT
Pin
NO. G13
Key unit ribbon cable
Key unit (Membrane Switch) front view
6
1
4
7
2
5
8
0
3
6
MINUTE
PLUS
POPCORN
R-404JK
1
2
4
3
5
6
A
B
B
C
C
Figure S-3. Control Unit Circuit
A
D
E
D
E
F
F
G
G
H
H
1
2
4
3
7
5
6
R-404JK
PARTS LIST
∆” may cause undue microwave exposure.
Note: The parts marked “∆
The parts marked “*” are used in voltage more than 250V. "§" MARK: PARTS DELIVERY SECTION.
REF. NO.
PART NO.
§
DESCRIPTION
1- 1
1- 2
1- 3
1- 4
1- 5
1- 6
1- 7
1- 8
1- 9
1-10
1-11
RC-QZB018MRE0
FH-DZB013MRY0
RLMPTA087WRZZ
RMOTEA346WRE0
FFS-BA019/KIT
QSW-MA085WRE0
QFS-TA014WRE0
RV-MZA323WRZZ
RMOTDA252/KIT
RTRN-B075MRE0
FACCDB003MRE0
M
M
M
M
M
M
M
M
M
M
M
High voltage capacitor
High voltage rectifier assembly
Oven lamp/socket
Fan motor
Monitor switch (V-16G-2C25), C/T fuse (20A 250V AC) & Inst.
Primary interlock switch and door sensing switch (V-5230Q)
Cavity temperature fuse 150OC
Magnetron
Turntable motor
Power transformer
Power supply cord
2- 1
2- 2
2- 3
GDAI-B068MRP0
GLEGPB004MRF0
GCABUB097MRP0
M
M
M
Base plate
Foot
Outer case cabinet
Q'TY CODE
ELECTRIC PARTS
∆
1
1
1
1
1
2
1
1
1
1
1
AQ
AM
AE
AR
AF
AE
AF
BC
AL
BA
AM
1
4
1
AN
AB
AT
CABINET PARTS
CONTROL PANEL PARTS
3- 1
3- 2
3- 3
3- 4
3- 5
3- 6
3- 7
3- 8
3- 9
3-10
3-11
3-12
3-13
CPWBFB091MRU0
HPNLFB010MRF0
FUNTKB403MRE0
JBTN-B173MRT0
MSPRRC045WRE0
XEPSD30P08XS0
HDECQB051MRT0
PCOVPB112MRF0
QCNC-A020WRZZ
HPNLCB179MRF0
PSHEPA900WREZ
RLCDSA107DRZZ
LANGQB060MRP0
M
M
M
M
M
M
M
M
M
M
M
M
M
4- 1
4- 2
4- 3
4- 4
4- 5
4- 6
4- 7
4- 8
4- 9
4-10
4-11
LBNDKB007MRP0
M
LANGTB060MRP0
M
PHOK-B018MRF0
M
MLEVPB016MRF0
M
PDUC-B125MRF0A M
NFANPB001MRE0
M
PDUC-B088MRF0
M
------------M
PCOVPB073MRP0
M
PPACGB014MRF0
M
PCUSUB033MRP0
M
Control unit assy
Control panel sub assembly
Key sheet assy
Open button
Open button spring
Screw; 3mm x 6mm
C/P J-Mold
Night light cover
Rubber connector
Key fixing mold
LED sheet
LCD
PWB support angle
1
1
1
1
1
5
1
1
1
1
1
1
1
BF
AN
AS
AM
AA
AB
AL
AD
AC
AL
AG
AG
AE
OVEN PARTS
H.V. Capacitor band
Chassis support
Latch hook
Switch lever
Magnetron duct
Fan blade
Fan duct
Oven cavity
(Not a replaceable part)
Waveguide cover
Turntable motor packing
Cushion
1
1
1
1
1
1
1
1
1
1
1
AB
AD
AF
AD
AE
AC
AC
-AC
AA
AC
1
1
1
1
1
1
1
1
1
AV
AD
AD
AQ
AE
AG
AA
AN
AX
DOOR PARTS
5 -1
5 -2
5 -3
5 -4
5 -5
5- 6
5- 7
5- 8
5- 9
FCOV-B260MRK0
LSTPPB021MRF0
MSPRTA046WRE0
FDORFB074MRT0
PSHEPB021MRE0
GCOVHB046MRF0
LSTPPB044MRF0
HPNL-B112MRE0
HDECQB050MRT0
M
M
M
M
M
M
M
M
M
Door frame assembly
Latch head
Latch spring
Door panel
Sealer film
Choke cover
Door stopper
Door screen
J-mold
8
R-404JK
REF. NO.
PART NO.
§
DESCRIPTION
Q'TY CODE
MISCELLANEOUS
6666666-
1
2
3
4
5
6
7
FW-VZB217MRE0
FROLPB025MRK0
NTNT-A108WREZ
TCAUAB050MRR0
TCAUAB053MRR0
TINSEB375MRK0
QW-QZB016MRE0
M
M
M
M
M
M
M
Main wire harnes
Turntable support
Turntable tray
Monitor caution label
DHHS/Screw caution label
Operation manual
High voltage wire A
7777777-
1
2
3
4
5
6
7
LX-BZA041WRE0
LX-CZ0052WRE0
XHTSD40P12RV0
XOTSE40P12000
XCBSD30P08000
XHTSD40P08RV0
LX-CZA070WRE0
M
M
M
M
M
M
M
Special
Special
Screw :
Screw :
Screw :
Screw :
Special
1
1
1
1
1
1
1
AT
AN
AM
AA
AB
AD
AC
5
2
1
9
3
3
2
AA
AA
AA
AA
AA
AA
AB
SCREWS,NUTS AND WASHERS
screw
screw
4mm x
4mm x
3mm x
4mm x
screw
12mm
12mm
8mm
8mm
(Torx tamper proof screw)
HOW TO ORDER REPLACEMENT PARTS
To have your order filled promptly and correctly, please furnish the following information.
1. MODEL NUMBER
2. REF. NO.
3. PART NO.
4. DESCRIPTION
Order Parts from the authorized SHARP parts Distributor for your area.
Defective parts requiring return should be returned as indicated in the Service Policy.
9
R-404JK
2
1
4
3
6
5
OVEN AND CABINET PARTS
7-4
A
A
7-4
7-7
2-3
B
B
4-7
7-7
6-5
7-5
1-7
C
C
1-4
4-6
7-3
7-6
1-11
D
D
1-5
4-8
7-6
4-2
7-4
E
1-8
4-9
6-4
E
7-4
7-2
7-2
6-3
1-3
7-4
7-1
1-6
4-3
4-10
4-5
1-9
1-10
F
7-5
2-1
6-2
F
1-5
1-6
7-1
4-4
4-1
1-1
1-2
G
G
7-4
7-4
2-2
2-2
7-4
2-2
4-11
2-2
H
H
1
2
4
3
10
5
6
R-404JK
2
1
4
3
6
5
CONTROL PANEL PARTS
3-2
A
A
3-13
3-1
3-10
3-11
3-9
3-12
3-3
3-6
3-8
3-7
B
B
3-5
3-4
C
C
DOOR PARTS
5-7
5-6
D
D
5-4
E
E
5-8
5-5
5-9
F
F
5-2
MISCELLANEOUS
5-3
G
G
5-1
6-1
6-7
H
1
2
4
3
11
Actual wire harness may be different from illustration.
5
H
6
R-404JK
PACKING AND ACCESSORIES
TOP PAD ASSEMBLY
DOOR PROTECTION SHEET
6-3 TURNTABLE TRAY
PLASTIC BAG
ON TOP OF THE OVEN
TRAY HOLDER
6-6 OPERATION MANUAL
IN
TO
TH
EO
NC
VE
AV
ITY
BOTTOM PAD ASSEMBLY
6-2 TURNTABLE SUPPORT
PACKING CASE
Non-replaceable items
12
R-404JK
NOTES
13
R-404JK
COPYRIGHT © 2004 BY SHARP CORPORATION
ALL RIGHTS RESERVED.
No part of this publication may be reproduced, stored in retrieval systems, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording,
or otherwise, without prior written permission
of the publisher.
2004 SHARP CORP. (4M2.00E) Printed in U.S.A
14