SHARP R-510HK, R-510HW Service Manual

SER VICE MANUAL

S43M208R510HE

MICROWA VE OVEN

R-510HK
R-510HW

MODELS

R-510HK
R-510HW

R-510HK

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

OPERATION ........................................................................................................................................................ 6

TROUBLESHOOTING GUIDE............................................................................................................................. 9

TEST PROCEDURE ...........................................................................................................................................10

TOUCH CONTROL PANEL ................................................................................................................................18

COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ..................................................................23

PICTORIAL DIAGRAM ........................................................................................................................................30

CONTROL UNIT CIRCUIT ...................................................................................................................................31

PRINTED WIRING BOARD .................................................................................................................................32

PARTS LIST........................................................................................................................................................33

PACKING AND ACCESSORIES .........................................................................................................................37

SHARP ELECTRONCS CORPORATION

Service Headquarters: Sharp Plaza, Mahwah, New Jersey, 07430-2135

This document has been published to be used for after
sales service only.
The contents are subject to change without notice.

R-510HK
R-510HW

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.

W ARNING TO SERVICE PERSONNEL

Microwave ovens contain circuitry capable of pro­ducing very high voltage and current, contact with
following parts
fatal, electrical shock.

(Example)
High Voltage Capacitor, High Voltage Power Trans-

former, Magnetron, High Voltage Rectifier Assem­bly, High Voltage Harness etc..

Read the Service Manual carefully and follow all
instructions.

may result in a severe, possibly

Don't Touch !
Danger High Voltage

R-510HK
R-510HW

Before Servicing

1. Disconnect the power supply cord , and then
remove outer case.

2. Open the door and block 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 high­voltage capacitor (that is the connecting lead of the high­voltage 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
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.

After repairing

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.

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 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.

1

R-510HK
R-510HW

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±5

O

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

SERVICE MANUAL

R-510HK
R-510HW

MICROWAVE OVEN

R-510HK/R-510HW

FOREWORD

This Manual has been prepared to provide Sharp Electronics Corp.
Service Personnel with Operation and Service Information for the SHARP
MICROWAVE OVENS R-510HK and R-510HW.

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.

PRODUCT DESCRIPTION

GENERAL INFORMATION

OPERATION

TROUBLESHOOTING GUIDE AND
TEST PROCEDURE

TOUCH CONTROL PANEL

COMPONENT REPLACEMENT
AND ADJUSTMENT PROCEDURE

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.

WIRING DIAGRAM

PARTS LIST

SHARP ELECTRONICS CORPORATION

SHARP PLAZA, MAHWAH,

NEW JERSEY 07430-2135

3

R-510HK
R-510HW

SPECIFICATION

ITEM DESCRIPTION

Power Requirements 120 Volts

14.3 Amperes, 1700 watts
60 Hertz
Single phase, 3 wire grounded

Power Output 1200 watts (IEC 705 TEST PROCEDURE)

Operating frequency of 2450MHz

Case Dimensions Width 24"

Height 13-3/8"
Depth 19-1/8"

Cooking Cavity Dimensions Width 17-3/8"

Height 10-1/2"

2.0 Cubic Feet Depth 18-5/8"
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 center pads, Defrost center pads, Number
selection pads, Power Level pad, Timer/Clock pad,Stop/Clear pad, Keep warm,
Hot Water, Reheat, Popcorn and Night light.

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

a qualified electrician and have it replaced with a properly grounded

3-Pronged
Plug

Grounded
Receptacle Box

Grounding Pin

3-Pronged Receptacle

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.

CAUTION: DO NOT UNDER ANY CIRCUMSTANCES CUT OR RE-

MOVE THE ROUND GROUNDING PRONG FROM THIS
PLUG.

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.

10.Wave guide cover.

11.Power supply cord

6

2

3

R-510HK
R-510HW

5

10

4

7

11

9

8

1

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-510HK/HW

TOUCH CONTROL PANEL

5

R-510HK
R-510HW

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 flashing "88:88".
To set any program or set the clock, you must first touch
the STOP/CLEAR pad. The display will clear, and " : "
will appear.

COOKING CONDITION

Program desired cooking time by touching the NUMBER
pads. Program the power level by touching the POWER
LEVEL pad and then a Number pad.
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.
(For details, refer to Figure O-2)

and is mechanically associated with the door so that it will
function in the following sequence.

(1) When the door opens from the closed position, the

secondary interlock relay (RY2) and primary interlock
switch open their contacts. And contacts of the relay
(RY1) remains closed. Then the monitor switch contacts
close.

(2) When the door is closed from the open position, the

monitor switch contacts open first. Then the contacts of
the primary interlock switch and door sensing switch

close. And contacts of the relay (RY1) open.
If the primary interlock switch and secondary interlock relay
(RY2) fail with the contacts closed when the door is opened,
the closing of the monitor switch contacts will form a short
circuit through the C/T fuse, primary interlock switch, relay
(RY1) and secondary interlock relay (RY2), causing the C/T
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-2) which is operated by the
control unit within a 32 second time base. Microwave power
operation is as follows:

RELAY CONNECTED COMPONENTS
RY-1 oven lamp/turntable motor/fan motor
RY-2 power transformer

2. 120 volts A.C. is supplied to the primary winding of the
power transformer and is converted to about 3.3 volts
A.C. output on the filament winding, and approximately
2370 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 doubler
circuit.

4. The microwave energy produced by the magnetron is
channelled 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, the monitor
switch, door sensing switch, primary interlock switch,
relay (RY1) and secondary interlock relay are activated
with the following results. The circuits to the turntable
motor, the cooling fan motor, and the high voltage
components are de-energized, the oven lamp remains on,
and the digital read-out displays the time still remaining in
the cook cycle when the door was opened.

7. The monitor switch electrically monitors the operation of
the primary interlock switch and secondary interlock relay

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
filament.

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R-510HK
R-510HW

SCHEMATIC

NOTE: CONDITION OF OVEN

1. Door Closed

2. CLOCK APPEARS ON DISPLAY

RED

N.O.

C/T
FUSE

(RY1)

OVEN
LAMP
RELAY

ORG
ORG

N.O.

COM.

ORG

OL

GRY

120VAC
60Hz

CAVITY
TEMPERATURE
FUSE

RED

GRN

GND

WHT

Note:* Indicates component

BRN

WHT

WHT

GRY

ORG

OVEN
LAMP

COM.

(RY2)

SECONDARY
INTERLOCK
RELAY

CONTROL UNIT

N.O.

WHT

WHT

PRIMARY
INTERLOCK
SWITCH

BRN

TTM

WHT

COM.

TURN
TABLE
MOTOR

B2

B1

F3

F2

F1

ORG

RED

ORG

FM

WHT

DOOR
SENSING
SWITCH

HUMIDITY

SENSOR

FAN
MOTOR

MONITOR
SWITCH

WHT

N.C.

COM.

WHT

RED

RED

WHT

WHT

POWER
TRANSFORMER

HIGH
VOLTAGE
CAPACITOR

HIGH
VOLTAGE
RECTIFIER

MAGNETRON

Figure O-1 Oven Schematic - Off Condition

SCHEMATIC

NOTE: CONDITION OF OVEN

1. DOOR CLOSED

2. COOKING TIME PROGRAMMED

3. VARIABLE COOKING CONTROL "HIGH"

4. "START" PAD TOUCHED

RED

N.O.

C/T
FUSE

(RY1)

OVEN
LAMP
RELAY

ORG
ORG

BRN

ORG

N.O.

SECONDARY
INTERLOCK
RELAY

ORG

OL

WHT

WHT

CONTROL UNIT

OVEN
LAMP

COM.

GRY

PRIMARY
INTERLOCK
SWITCH

COM.

GRY

120VAC
60Hz

CAVITY
TEMPERATURE
FUSE

RED

GRN

GND

WHT

Figure O-2 Oven Schematic - Cooking Condition

(RY2)

N.O.

WHT

WHT

TTM

BRN

WHT

COM.

TURN
TABLE
MOTOR

B2

B1

F3

F2

F1

ORG

RED

ORG

FM

WHT

DOOR
SENSING
SWITCH

HUMIDITY

SENSOR

FAN
MOTOR

MONITOR
SWITCH

WHT

N.C.

COM.

WHT

RED

RED

WHT

WHT

POWER
TRANSFORMER

HIGH
VOLTAGE
CAPACITOR

HIGH
VOLTAGE
RECTIFIER

MAGNETRON

7

R-510HK
R-510HW

DESCRIPTION AND FUNCTION OF COMPONENTS

DOOR OPEN MECHANISM

The door is opened by pushing the open button on the control
panel, refer to the Figure D-1. When the open button is
pushed, the open button pushes up the switch lever, and
then the switch lever pushes up the latch head. The latch
heads are moved upward and released from latch hook.
Now the door will open.

Latch Heads

Door

Switch Lever

Door Sensing
Switch

Monitor Switch

Primary Interlock
Switch

Figure D-1. Door Open Mechanism

DOOR SENSING AND PRIMARY INTERLOCK

SWITCHES

The primary interlock switch is mounted in the lower position
of the latch hook and the door sensing switch in the second­ary interlock system is mounted in the upper position of the
latch hook. They are activated by the latch heads on the door.
When the door is opened, the switches interrupt the power to
all high voltage components. A cook cycle cannot take place
until the door is firmly closed thereby activating both interlock
switches. The secondary interlock system consists of the
door sensing switch and secondary interlock relay located on
the control circuit board.

MONITOR SWITCH

The monitor switch is activated (the contacts opened) by the
latch head on the door while the door is closed. The switch
is intended to render the oven inoperative, by means of
blowing the C/T fuse, when the contacts of the secondary
interlock relay (RY2) and primary interlock switch fail to open
when the door is opened.

Functions:

1. When the door is opened, the monitor switch contact close
(to the ON condition) due to their being normally closed. At
this time the secondary interlock relay (RY2) and primary
interlock switch are in the OFF condition (contacts open)
due to their being normally open contact switches.

2. As the door goes to a closed position, the monitor switch
contacts are first opened and then the door sensing switch
and the primary interlock switch contacts close. (On opening
the door, each of these switches operate inversely.)

3. If the door is opened, and the secondary interlock relay
(RY2) and primary interlock switch contacts fail to open,
the C/T fuse blows simultaneously with closing of the
monitor switch contacts.

CAUTION: BEFORE REPLACING A BLOWN C/T FUSE

TEST THE DOOR SENSING SWITCH, SEC­ONDARY INTERLOCK RELAY (RY2), RELAY
(RY1), PRIMARY INTERLOCK SWITCH AND
MONITOR SWITCH FOR PROPER OPERA­TION. (REFER TO CHAPTER "TEST PROCE­DURE").

NOTE: C/T FUSE AND MONITOR SWITCH ARE

REPLACED AS AN ASSEMBLY.

TURNTABLE MOTOR

The turntable motor rotates the turntable located on the
bottom of the oven cavity, so that the foods on the turntable
cook evenly during cooking. The turntable may turn in either
direction.

COOLING FAN MOTOR

The cooling fan motor drives a blade which draws external cool
air. This cool air is directed through the air vanes surrounding
the magnetron and cools the magnetron. This air is channeled
through the oven cavity to remove steam and vapors given off
from the heating foods. It is then exhausted through the
exhausting air vents at the oven cavity.

CAVITY TEMPERATURE FUSE

The cavity temperature fuse located on the top of the oven
cavity, is designed to prevent damage to the oven by fire. If the
food load is overcooked, by either error in cook time or defect
in the control unit, the cavity temperature fuse will open.
Under normal operation, the cavity temperature fuse remains
closed. However, when abnormally high temperatures are
reached within the oven cavity, the cavity temperature fuse will
open at 302OF(150OC) causing the oven to shut down.
NOTE: This is fuse. It does not reset.

C/T TEMPERATURE FUSE

The C/T fuse located near the magnetron is designed to prevent
damage to the magnetron if an over heated condition develops
in the tube due to cooling fan failure, obstructed air guide, dirty
or blocked air intake, etc.
Under normal operation, the C/T fuse remains closed. How­ever, when abnormally high temperatures are reached within
the magnetron, the C/T fuse will open at 302OF(150OC) causing
the oven to shut down.

1. The C/T fuse blows when the contacts (COM-NO) of the
secondary interlock relay (RY2) and primary interlock
switch remain closed with the oven door open and when
the monitor switch closes.

2. If the wire harness or electrical components are short­circuited, this monitor fuse blows to prevent an electric
shock or fire hazard.

NOTE: This is fuse. It does not reset.

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R-510HK
R-510HW

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 which
will be found in the "Test Procedure "section.

IMPORTANT: If the oven becomes inoperative because of a blown C/T fuse, check the monitor switch, relay (RY1) secondary

interlock relay (RY2), door sensing switch and primary interlock switch before replacing the C/T fuse. If the
C/T fuse is replaced, the monitor switch must also be replaced. Use part FFS-BA019/KIT as an assembly.

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.

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R-510HK
R-510HW

CK = Check / RE = Replace

CONDITION

OFF
CONDITION

COOKING
CONDITION

TEST PROCEDURE

AND

POSSIBLE CAUSE

DEFECTIVE PARTS

PROBLEM

Home fuse or circuit breaker blows
when power cord is plugged into wall
receptacle

C/T fuse blows when power cord is
plugged into wall receptacle.

All letters and indicators do not ap­pear in display when power cord is
first plugged into wall outlet.

Display does not operate properly
when STOP/CLEAR key is touched.
(Buzzer should sound and ":" or time
of day should appear in display.)

Oven lamp does not light when door
is opened.

Oven lamp does not go out when
door is closed.

Oven lamp lights but fan motor and
turntable motor do not operate.

Oven does not go into cook cycle
when START pad is touched

Oven seems to be operating but little
or no heat is produced in oven load.
(Food incompletely cooked or not
cooked at all at end of cook cycle.)

Oven goes into a cook cycle but
extremely uneven heating is pro­duced in oven load (food).

Oven does not cook properly when
programmed for Cooking Power P­50 mode. (Operates properly on
Cooking P-HI (HIGH) mode.)

Oven goes into COMPU DEFROST
but food is not defrosted well.

RE RE

ABCDEEF FGH

SHORT IN POWER CORD

SHORT OR OPENED WIRING

MAGNETRON

POWER TRANSFORMER

H.V. RECTIFIER ASSEMBLY

RE RE CKICK CK CK

HIGH VOLTAGE CAPACITOR

CAVITY TEMPERATURE FUSE

C/T FUSE

SECONDARY INTERLOCK SYSTEM

PRIMARY INTERLOCK SWITCH

MONITOR SWITCH

C/T FUSE

OVEN LAMP OR SOCKET

COOLING FAN MOTOR

TURNTABLE MOTOR

TOUCH CONTROL PANEL

WRONG OPERATION

LOW VOLTAGE

JKLM

DIRTY OVEN CAVITY

KEY UNIT

RELAY (RY1)

COMPU DEFROST

FOIL PATTERN ON PWB.

PROCEDURE

LETTER

A MAGNETRON ASSEMBLY TEST

1. Disconnect the power supply cord, and then remove outer case.

2. Open the door and block it open.

3. Discharge high voltage capacitor.

TEST PROCEDURES

COMPONENT TEST

10