SHARP R508HS Service Manual

SUPPLEMENTAL SERVICE MANUAL

S83M216R508HE

MICROWAVE OVEN

R-508HS

MODEL

R-508HS

R-508HS

This is a supplemental Service Manual for Microwave Oven model R-508HS. This model is quite similar to the base models
R-510HK/R-510HW; (S43M208R510HE).

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

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

TEST PROCEDURE .............................................................................................................................................. 7

TOUCH CONTROL PANEL .................................................................................................................................... 8

COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ..................................................................12

PICTORIAL DIAGRAM ........................................................................................................................................17

CONTROL UNIT CIRCUIT ................................................................................................................................... 18

PRINTED WIRING BOARD ................................................................................................................................. 19

PARTS LIST ........................................................................................................................................................ 20

PACKING AND ACCESSORIES ......................................................................................................................... 24

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-508HS

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.

WARNING 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

R-508HS

Don't Touch !
Danger High Voltage

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-508HS

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-508HS

MICROWAVE OVEN

R-508HS

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-508HS.

The model R-508HS is quite similar to base models R-510HK/R-510HW
(Ref.# S43M208R510HE).

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

TOUCH CONTROL PANEL

COMPONENT REPLACEMENT
AND ADJUSTMENT PROCEDURE

WIRING DIAGRAM

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.

PARTS LIST

SHARP ELECTRONICS CORPORATION

SHARP PLAZA, MAHWAH,

NEW JERSEY 07430-2135

3

R-508HS

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

Cook pads, Defrost pads, Number selection pads, Power Level pad, Timer/Clock
pad,Clear pad, Reheat, Popcorn and Minute Plus, Stop/Clear, Start (Door).

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-508HS

7

9

5

10

1

4

11

8

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-508HS

5

R-508HS

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 CLEAR pad/button. 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.

6

TEST PROCEDURES

R-508HS

PROCEDURE

LETTER

Pin
NO. G1

Pin
NO. G13

Key unit ribbon cable

Key unit (Membrane Switch) front view

COMPONENT TEST

G8 G7 G6 G5 G4 G3 G2 G1

G9

G10G11G12G13

POPCORN

DEFROST

*

Key Unit

K RELAY 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.

4. Disconnect the leads to the primary of the power transformer.

5. Ensure that these leads remain isolated from other components and oven chassis by using insulation
tape.

6. After that procedure, re-connect the power supply cord.

7. Remove the outer case and check voltage between the normal open terminal of the relay RY1 and the
normal open terminal of the relay RY2 on the control unit with an A.C. voltmeter.
The meter should indicate 120 volts, if not check oven circuit.
RY1 and RY2 Relay Test
These relays are operated by D.C. voltage
Check voltage at the relay coil with a D.C. voltmeter during the microwave cooking operation.

DC. voltage indicated ............... Defective relay.

DC. voltage not indicated ......... Check diode which is connected to the relay coil. If diode is good,

control unit is defective.

STOP

MINUTE

*

PLUS

*

CLEAR

*

START

COOK

REHEAT

1

4

7

CLEAR

2

TIMER

5

CLOCK

8

POWER

0

LEVEL

When door is close, key can be operated.

9

3

6

RELAY SYMBOL OPERATIONAL VOLTAGE CONNECTED COMPONENTS

RY1 Approx. 12.0V D.C. Oven lamp / Turntable motor / Cooling fan motor

RY2 Approx. 12.0V D.C. Power transformer

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

9. Open the door and block it open.

10. Discharge high voltage capacitor.

11. Reconnect all leads removed from components during testing.

12. Re-install the outer case (cabinet).

13. Reconnect the power supply cord after the outer case is installed.

14. Run the oven and check all functions.

L COMPU DEFROST TEST

WARNING : The oven should be fully assembled before following procedure.

(1) Open the door.
(2) Place one cup of water in the center of the turntable tray in the oven cavity.
(3) Touch the " DEFROST " pad.
(4) Touch the number pad " 2 ".
(5) Touch the number pad " 5 ".
(6) Close the door.
(7) Touch the "START " pad.
(8) The oven is in Defrost cooking condition.
(9) The oven will operate as follows

MENU 1ST STAGE 2ND STAGE 3RD STAGE

STEAKS/CHOPS LEVEL TIME LEVEL TIME LEVEL TIME

0.5lb 60% 20sec. 40% 20sec. 30% 45sec.

(10) If improper operation is indicated, the control unit is probably defective and should be checked.

7

R-508HS

TOUCH CONTROL PANEL ASSEMBLY

OUTLINE OF TOUCH CONTROL PANEL

The touch control section consists of the following units.

(1) Key Unit
(2) Control Unit (The Control Unit consists of Power Unit and

LSI Unit).

The principal functions of these units and the signals commu­nicated among them are explained below.

Key Unit

The key unit is composed of a matrix, signals generated in the
LSI are sent to the key unit through P20-P27.
When a key pad is touched, a signal is completed through the
key unit and passed back to the LSI through P70, P71, P41,
P45, P47 and AN3 to perform the function that was re­quested.

Control Unit

Control unit consists of LSI, reset circuit, indicator circuit,
power source circuit, relay circuit, buzzer circuit, synchroniz­ing signal circuit and back light circuit.

1) Reset Circuit

This circuit generates a signal which resets the LSI to the
initial state when power is supplied.

2) Indicator Circuit

This circuit consists of 22 segments and 3 common
electrodes using a Liquid Crystal Display.

3) Power Source Circuit

This circuit generates voltages necessary in the control
unit from the AC line voltage.
In addition, the synchronizing signal is available in order
to compose a basic standard time in the clock circuit.

Symbol Voltage Application

VSS -5V LSI(IC1)

4) Relay Circuit

A circuit to drive the magnetron, fan motor, turntable
motor and light the oven lamp.

5) Buzzer Circuit

The buzzer is responsive to signals from the LSI to emit
audible sounds (key touch sound and completion sound).

6) Synchronizing Signal Circuit

The power source synchronizing signal is available in
order to compose a basic standard time in the clock
circuit. It accompanies a very small error because it
works on commercial frequency.

7) Door Sensing Switch

A switch to “tell” the LSI if the door is open or closed.

8) Back Light Circuit

A circuit to drive the back light (Light emitting diodes LD1­LD4).

8

DESCRIPTION OF LSI

A

B

0.1 sec.

2.0 sec.

H : GND

L : -5V

H : GND

L : -5V

D

LSI

The I/O signal of the LSI is detailed in the following table.

Pin No. Signal I/O Description

R-508HS

1-2

VL2-VL1

IN Power source voltage input terminal.

Standard voltage for LCD.

3-6 AN7-AN4 IN

Terminal to change cooking input according to the Model.

By using the A/D converter contained in the LSI, DC voltage in accordance with the Model
in operation is applied to set up its cooking constant.

7 AN3 IN Signal coming from touch key.

When either G13 line on key matrix is touched, a corresponding signal out of P20 - P27
will be input into AN3. When no key is touched, the signal is held at “H” level.

8 AN2 IN

To input signal which communicates the door open/close information to LSI.

Door close "H" level signal (0V). Door Open "L" level (-5V).

9 AN1 IN Terminal not used.

10 AN0 IN Terminal not used.

11-13 P57-P55 OUT Terminal not used.

14 CNTR0 OUT

Signal to sound buzzer (2.0 kHz).

A: key touch sound.

B: Completion sound.

15 P53 OUT Terminal not used.

16 P52 OUT Oven lamp, fan motor and turntable motor driving signal

To turn on and off shut off relay (RY1). The

16.7 msec.

square waveform voltage is delivered to the
RY1 driving circuit and RY2 control circuit.

During cooking

H : GND

L : -5V

17 P51 OUT Terminal not used.

18 P50 OUT Magnetron high-voltage circuit driving signal.

To turn on and off the cook relay (RY2). The
signals holds “L” level during microwave cook-

Maximum
output

ing and “H” level while not cooking. In other
cooking modes (variable cooking) the signal
turns to “H” level and “L” level in repetition

70% of maximum
output

OFF

ON

OFF OFF

ON

according to the power level.

19 P47 IN Signal similar to AN3.

When either G13 line on key matrix is touched, a corresponding signal will be input into
P46.

20 P46 OUT Terminal not used.

21 P45 IN Signal similar to AN3.

When either G12 line on key matrix is touched, a corresponding signal will be input into
P45.

22-23 P44-P43 OUT Terminal not used.

24 INT0 IN Signal synchronized with commercial power source frequency.

This is the basic timing for time processing of LSI.

16.7 msec.

24 sec.

8 sec.

H : GND

L : -5V

H : GND

L : -5V

H : GN

L : -5V

9

R-508HS

Pin No. Signal I/O Description

25 P41 IN Signal similar to AN3.

When either G11 line on key matrix is touched, a corresponding signal will be input into
P41.

26 P40 IN Connected to GND through the pull-down resistor.

27 RESET IN Auto clear terminal.

Signal is input to reset the LSI to the initial state when power is applied.

28 P71 IN Signal similar to AN3.

When either G10 line on key matrix is touched, a corresponding signal will be input into
P71.

29 P70 IN Signal similar to ANI3.

When either G9 line on key matrix is touched, a corresponding signal will be input into P70.

30 XIN IN Internal clock oscillation frequency control input setting.

The internal clock frequency is set by inserting the ceramic filter oscillation circuit with
respect to XOUT terminal.

31 XOUT OUT Internal clock oscillation output.

Output to control oscillation input to XIN.

32 VSS IN Power source voltage : -5.0V.

The power source voltage to the drive LSI is input to VSS terminal.

33 P27 OUT Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to P70, P71, P41, P45, P47
and AN3 terminal while one of G8 line keys on key matrix is touched.

34 P26 OUT Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to P70, P71, P41, P45, P47
and AN3 terminal while one of G7 line keys on key matrix is touched.

35 P25 OUT Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to P70, P71, P41, P45, P47
and AN3 terminal while one of G6 line keys on key matrix is touched.

36 P24 OUT Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to P70, P71, P41, P45, P47
and AN3 terminal while one of G5 line keys on key matrix is touched.

37 P23 OUT Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to P70, P71, P41, P45, P47
and AN3 terminal while one of G4 line keys on key matrix is touched.

38 P22 OUT Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to P70, P71, P41, P45, P47
and AN3 terminal while one of G3 line keys on key matrix is touched.

39 P21 OUT Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to P70, P71, P41, P45, P47
and AN3 terminal while one of G2 line keys on key matrix is touched.

40 P20 OUT Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to P70, P71, P41, P45, P47
and AN3 terminal while one of G1 line keys on key matrix is touched.

41 P17 OUT Back light signal. (Light emitting diodes) driving signal

42-46 P16-P12 OUT Terminal not used.

47-50

51-72

SEG25-SEG22

SEG21-SEG0

OUT Terminal not used.

OUT Segment data signal.

10

Pin No. Signal I/O Description

Connected to LCD.

The relation between signals are as follows:

LSI signal (Pin No.) LCD (Pin No.) LSI signal (Pin No.) LCD (Pin No.)
SEG0 (72)

SEG1 (71)
SEG2 (70)
SEG3 (69)
SEG4 (68)
SEG5 (67)
SEG6 (66)
SEG7 (65)
SEG8 (64)
SEG9 (63)
SEG10 (62)

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

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

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

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

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

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

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

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

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

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

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

SEG 0 SEG11 (61)
SEG 1 SEG12 (60)
SEG 2 SEG13 (59)
SEG 3 SEG14 (58)
SEG 4 SEG15 (57)
SEG 5 SEG16 (56)
SEG 6 SEG17 (55)
SEG 7 SEG18 (54)
SEG 8 SEG19 (53)
SEG 9 SEG20 (52)

SEG 10 SEG21 (51)

73 VCC IN Power source voltage : GND(0V).

74 VREF IN A/D converter power source voltage : GND(0V).

The power source voltage to drive the A/D converter. Connected to GND.

75 AVSS IN A/D converter power source voltage : -5.0V.

The power source voltage to drive the A/D converter.

76 COM3 OUT Terminal not used.

77 COM2 OUT Common data signal.

Connected to LCD signal COM1.

78 COM1 OUT Common data signal.

Connected to LCD signal COM2.

79 COM0 OUT Common data signal.

Connected to LCD signal COM3.

80 VL3 IN Power source voltage input terminal.

Standard voltage for LCD. Connected to GND.

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

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

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

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

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

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

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

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

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

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

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

R-508HS

SEG 11
SEG 12
SEG 13
SEG 14
SEG 15
SEG 16
SEG 17
SEG 18
SEG 19
SEG 20
SEG 21

11

R-508HS

OVEN LAMP AND LAMP SOCKET REMOVAL

1.

Disconnect the power supply cord and remove outer case.

2. Open the door and block it open.

3. Discharge high voltage capacitor.

4. Pull the wire leads from the oven lamp socket.

5. Remove the screw from the oven lamp socket.

6. Remove the oven lamp socket from the magnetron duct.

7. Remove the oven lamp from the socket by turning the
oven lamp.

8. Now, the oven lamp and the oven lamp socket are free.

POSITIVE LOCK® CONNECTOR (NO-CASE TYPE) REMOVAL

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. Push the lever of positive lock® connector.

5. Pull down on the positive lock® connector.

Terminal

Oven lamp
socket

Figure C-1. Oven lamp socket

CAUTION: WHEN CONNECTING THE POSITIVE LOCK

CONNECTORS TO THE TERMINALS, CON­NECT THE POSITIVE LOCK® SO THAT THE
LEVER FACES YOU.

CONTROL PANEL ASSEMBLY REMOVAL

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 wire leads from panel components.

5. Remove the one (1) screw holding the control panel
assembly to the oven cavity front plate.

6. Slide the control panel assembly upward and remove it.

7. Now, individual components can be removed.

GRAPHIC SHEET AND MEMBRANE SWITCH REPLACEMENT

®

Figure C-2. Positive lock® connector

NOTE: 1. Before attaching a new key unit, wipe off remaining

adhesive on the control panel frame surfaces
completely with a soft cloth soaked in alcohol.

2. When attaching the key unit to the control panel
frame, adjust the upper edge and right edge of the
key unit to the correct position of control panel
frame.

3. Place the key unit firmly to the control panel frame
by rubbing with soft cloth not to scratch.

Removal

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. Remove the control panel assembly, referring to chapter of CONTROL PANEL ASSEMBLY REMOVAL.

5.

Remove the three (3) screws holding the control unit to the control panel frame. And remove the control unit by releasing
from tabs.

6. Remove the rubber connector from the long slit on the control panel frame.

7. Remove the graphic sheet from the control panel frame. (*See special note)

8. Remove away the membrane switch from the control panel frame. (*See special note)

12

R-508HS

Removal

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. Remove the control panel assembly, referring to chapter of CONTROL PANEL ASSEMBLY REMOVAL.

5. Remove the graphic sheet from the control panel frame. (*See special note)

Installation

1. Remove remaining adhesive on the control panel frame surfaces with a soft cloth soaked in alcohol.

2. Make sure that the LCD sheet and the liquid crystal display in good condition.

3. Remove the backing paper from the new graphic sheet.

4. Adjust the upper edge and right edge of the graphic sheet to the large depression on the surface of the control panel frame.

5. Attach the graphic sheet to the control panel frame by rubbing with a soft cloth not to scratch.

6. Reinstall the control panel frame to the oven.

NOTE:
Do not touch the contact surface of the ribbon cable (edge) and the rubber connector with a finger directly not to be
oxidized.
If display digits are missing or scrambled, remove control unit and make sure that there is not any trash or foreign
substance on the contact surface of the rubber connector. Use an adhesive tape to clean the contact surface of the
rubber connector.
(* Heat gun will soften adhesive.)

Graphic
sheet

Control panel frame

Ribbon cable
of membrane
switch

Contact surface

Contact
surface

Slit

Liquid crystal
display

Long slit

Figure C-XXX Graphic Sheet Replacement

Rubber connector

Control panel frame
(Rear side)

TURNTABLE MOTOR REMOVAL

1. Disconnect the power supply cord.

2. Remove turntable and turntable support from oven cavity.

3. Lay the oven on it's backside. Remove the turntable motor
cover by snipping off the material in four corners.

4. Where the corners have been snipped off bend corner
areas flat. No sharp edges must be evident after removal
of the turntable motor cover.

13

5. Disconnect wire leads from turntable motor.
(See "Positive lock connector removal")

6. Remove one (1) screw holding turntable motor to oven
cavity.

7. Now the turntable motor is free.

8. After replacement, use the one (1) screw provided with the
TTM Kit, to attach the turntable motor cover.

R-508HS

COOLING FAN MOTOR REMOVAL

REMOVAL

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 wire leads from the fan motor.

5. Remove the two (2) screws holding the fan motor to the
oven cavity back plate.

6. Remove the fan blade from the fan motor shaft according
to the following procedure.

7. Hold the edge of the rotor of the fan motor by using a pair
of groove joint pliers.

CAUTION:
* Make sure that no metal pieces enter the gap between

the rotor and the stator of the fan motor because the
rotor is easily shaven by pliers and metal pieces may
be produced.

* Do not touch the pliers to the coil of the fan motor

because the coil may be cut or injured.

* Do not disfigure the bracket by touching with the

pliers.

8. Remove the fan blade from the shaft of the fan motor by
pulling and rotating the fan blade with your hand.

9. Now, the fan blade and the fan motor will be free.

CAUTION:
* Do not reuse the removed fan blade because the hole

(for shaft) may be larger than normal.

INSTALLATION

1. Install the fan blade to the fan motor shaft according to the
following procedure.

2. Hold the center of the bracket which supports the shaft of
the fan motor on the flat table.

3. Apply the screw lock tight into the hole (for shaft) of the
fan blade.

4. Install the fan blade to the shaft of fan motor by pushing
the fan blade with a small, light weight, ball peen hammer
or rubber mallet.

CAUTION:
* Do not hit the fan blade strongly when installed

because the bracket may be disfigured.

* Make sure that the fan blade rotates smooth after

installation.

* Make sure that the axis of the shaft is not slanted.

5. Install the fan motor to the oven cavity back plate with the
two (2) screws.

6. Connect the wire leads to the fan motor, referring to the
pictorial diagram.

Rear View

Side View

DOOR SENSING SWITCH/PRIMARY INTERLOCK SWITCH AND MONITOR SWITCH REMOVAL

1.

Disconnect the power supply cord and remove outer case.

2. Open the door and block it open.

3. Discharge high voltage capacitor.

4. Disconnect wire leads from the switches.

5.

Remove two (2) screws holding latch hook to oven flange.

6. Remove latch hook assembly from oven flange.

7. Push outward on the two (2) retaining tabs holding switch
in place.

8. Switch is now free.
At this time switch lever will be free, do not lose it.

Re-install

1. Re-install each switch in its place. The primary interlock/
monitor switches are in the lower position and the door
sensing switch is in the upper position.

2. Re-connect wire leads to each switch.
Refer to pictorial diagram.

14

R-508HS

3. Secure latch hook (with two (2) mounting screws) to oven
flange.

4. Make sure that the monitor switch is operating properly

DOOR SENSING SWITCH/PRIMARY INTERLOCK SWITCH AND MONITOR SWITCH ADJUSTMENT

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

2. Open the door and block it open.

3. Discharge high voltage capacitor.

If the door sensing switch, primary interlock switch and
monitor switch do not operate properly due to a misadjustment,
the following adjustment should be made.

4. Loosen the two (2) screws holding latch hook to the oven
cavity front flange.

5. With door closed, adjust latch hook by moving it back and
forth, and up and down. In and out play of the door
allowed by the upper and lower position of the latch hook
should be less than 0.5mm. The vertical position of the
latch hook should be adjusted so that the door sensing
switch and primary interlock switch are activated with the
door closed. The horizontal position of the latch hook
should be adjusted so that the plunger of the monitor
switch is pressed with the door closed.

6. Secure the screws with washers firmly.

7. Check the operation of all switches. If each switch has not
activated with the door closed, loosen screw and adjust
the latch hook position.

After adjustment, check the following.

1. In and out play of door remains less than 0.5mm when in
the latched position. First check upper position of latch
hook, pushing and pulling upper portion of door toward
the oven face. Then check lower portion of the latch

and check continuity of the monitor circuit. Refer to chapter

"Test Procedure" and Adjustment procedure.

hook, pushing and pulling upper portion of door toward
the oven face. Both results (play in the door) should be
less than 0.5mm.

2. The door sensing switch and primary interlock switch
interrupt the circuit before the door can be opened.

3. Monitor switch contacts close when door is opened.

4. Re-install outer case and check for microwave leakage
around door with an approved microwave survey meter.
(Refer to Microwave Measurement Procedure.)

Latch Heads

Door

Switch Lever

Door Sensing
Switch

Monitor Switch

Primary Interlock
Switch

Figure C-3. Latch Switch Adjustments

DOOR REPLACEMENT

REMOVAL

1. Disconnect the power supply cord.

2. Push the open button and open the door slightly.

3. Insert a putty knife (thickness of about 0.5mm) into the
gap between the choke cover and door frame as shown in
Figure C-4 to free engaging parts.

4. Pry the choke cover by inserting a putty knife as shown
Figure C-4.

5. Release choke cover from door panel.

6. Now choke cover is free.

7. Release two (2) pins of door panel from two (2) holes of
upper and lower oven hinges by lifting up.

8. Now, door panel with door frame is free from oven cavity.

Choke cover

Putty knife

Door frame

Figure C-4. Door Disassembly

15

R-508HS

9. Release the door panel from twelve (12) tabs of door
frame.

10.Remove the door panel from the door frame.

11.Now, door panel with sealer film is free.

12.Tear sealer film from door panel.

13.Now, door panel is free.

14.Slide latch head upward and remove it from door frame
with releasing latch spring from door frame and latch head.

15.Now, latch head and latch spring are free.

16.Remove door screen from door frame

17.Now, door frame is free.

RE-INSTALL

1. Re-install door screen to door frame.

2. Re-install the latch spring to the latch head. Re-install the
latch spring to the door frame. Re-install latch head to door
frame.

3. Re-install door panel to door frame by fitting twelve (12)
tabs of door frame to twelve (12) holes of door panel.

4. Put sealer film on door panel. Refer to “Sealer Film” about
how to handle new one.

5. Catch two (2) pins of door panel on two (2) hole of upper
and lower oven hinges.

6. Re-install choke cover to door panel by pushing.

Note: After any service to the door;

(A) Make sure that door sensing switch and primary

interlock switch are operating properly. (Refer to
chapter “Test Procedures”.).

(B) An approved microwave survey meter should be

used to assure compliance with proper microwave
radiation emission limitation standards.

After any service, make sure of the following :

1. Door latch heads smoothly catch latch hook through
latch holes and that latch head goes through center of
latch hole.

2. Deviation of door alignment from horizontal line of cavity
face plate is to be less than 1.0mm.

3. Door is positioned with its face pressed toward cavity face
plate.

4. Check for microwave leakage around door with an approved
microwave survey meter. (Refer to Microwave
Measurement Procedure.)

Note: The door on a microwave oven is designed to act as

an electronic seal preventing the leakage of microwave
energy from oven cavity during cook cycle. This
function does not require that door be air-tight,
moisture (condensation)-tight or light-tight. Therefore,
occasional appearance of moisture, light or sensing
of gentle warm air movement around oven door is not
abnormal and do not of themselves indicate a leakage
of microwave energy from oven cavity.

Pin

Upper Oven
Hinge

Lower
Oven Hinge

Choke Cover

Door assembly

Latch
heads

Upper
Oven Hinge

Lower Oven

Pin

Hinge

Note:

When carring out any repair to the door, do not bend or
wrap the slit choke (tabs on the door panel assembly)
to prevent microwave leakage.

SEALER FILM

Installation

1. Put the adhesive tape on the backing film of the sealer
film as shown in Fig. C-6.

2. Tear the backing film by pulling the adhesive tape.

3. Put the pasted side of the sealer film on the door panel

Figure C-6. Sealer film

16

R-508HS

1

2

3

45

A

R
O
T

MO

E A
IR
W

H

HIG

VOLTAGE

BRN

CAPACITOR

T

H
W

T
H

W

H.V. RECTIFIER

RMER

ER

TRANSFO

POW

T
H

RED

W

t
us

ER SUPPLY

B

N

H

ED
R

ust always be
m

W

CORD 120V 60Hz

PO

NOTE:

HT
W

C

kept tight.

The screw

supply cord fixing screw.

been grounded by power

the power supply cord has

The grounding conductor of

NOTE:

ED
R

P. FUSE

D

CAVITY TEM

RED

be connected to the terminal with

The neutral (WHT/GRY) wire m

HT
W

on the power supply
ark

cord.

"N" m

RG
O

RG
O

RG
O

HT
W

P

VEN LAM
O

E:
T

NO

KET
C

AND SO

R
O
T

FAN MO

be
t

oven

rminal

us

te
the

wire m
)

to
d

ecte

with blue mark on the

conn

Hot (ORG

E
AG

LT

VO
H

HIG

ON

HIGH VOLTAGE COMPONENTS

ht socket.
lig

NETR

MAG

E

TURNTABL

6

A

B

C

D

E

FUSE

C/T

T

ITCH

SW

T
H

W

RN

PNK

G

N.O.

H

F

G

C

R

IT

SW

SENSING

DOO

COM.

RN
G

ven cavity

to O

RN
G

T
H

W

RN

PNK

G

CN-B

1

2

RY

T1

A
ND

OCK
L

O

R

SEC

INTE

1
Y
R

COM.

N.O.

-B
CN

12

IT)

ER UN
W

(PO

.

.O

N

.

M

O

C

RY2

T

T

H

H

W

W

COM.

R
O
T

NI

N.C.

RED

RED

RELAY

MO

NO

PRIMARY

T

H

H

RY

W

G

W

K
C

INTERLO

ITCH

SW

COM.

RY
G

RG

BRN

O

H

E

Figure S-1. Pictorial Diagram

F

G

H

1

2

3

45

6

17

R-508HS

1

A

NO.

LBS.

CUPS

B

LIQUID CRYSTAL DISPLAY

SEG0

SEG1

KG OZ.

EG2

S
SEG3

AUTO%

SEG4
SEG5

EG6

S
SEG7
SEG8
SEG9

SEG10

SEG11

SENSOR

2

1

SEG

13

SEG

SEG14

15

SEG

6

SEG1

SEG17

SEG18

SEG19

DEFROST

0

SEG2

21

SEG

OM1

C
COM2

3

COM

COOK

0

C

D
N
G

D

E

(J16)

4.7K

(J14)

(J12)

(J10)

C14

1K

R10

11
Q

0.1uF50V

C12

AN7

6
N

3.6K

AN5 A

AN4

0.01uF25V

Q10

ZD10

DTA143EKA

5K

uF/50V

1

4.7K

(J17)

20K

(J15)

4.7K

(J13)

4.7K

(J11)

15K

R11

2SA1037AK

UDZ4.3B

0.01uF25V

C13

1
R12

.

0

2

3

(F)

64

9

EG8

EG

S

S

65

7

SEG
SEG6
SEG5
SEG4
SEG3
SEG2
SEG1
SEG0
VCC
VREF

VSS

A
COM3
COM2
COM1

M0

CO

VL3

VL2

80

VL1

1

15

10K

COM2
COM1
COM

R

14

10K

R

13

10K

R

(F)

6

10

11

1

G

G

EG15

EG

SE

SE

SEG12

SEG13

SEG14

S

S

3

17

18

2

24

G

G

SE

SE

25

G21

G

G

EG22

EG

SEG19

SEG20

SE

S

S

SE

SE

41

12

13

14

15

16

17

P

P

P

P

P

P

IC1

6

5

4

6

AN7

AN

P57

AN

P5

AN

P

A

AN2

AN1

AN0

CNTR0

43EKA

30

TA1

Q

D

5
5

N3

5

T0

50

47

46

4

44

P53

P52

0
2
C

43

P51

P

P

P

P

P

P

IN

24

50V

0.1uF

0
2

Q

A143EKA
T
D

C11

BL

-5V

INT

GND

47uF/16V

F

G

D1 - D4

1N4002x4

C10

3

5

R

R

510

1/2W

Q2

2SA933AS

4.7K 1/4W

2

PER

R

V

5

2

F

00u

2

G471K

IER

M

W

2

JU

C2

1
C

T1

d

PA151D R

10

VRS1

a

.1uF
0

b

5D6
D

50V

4
R

1SS270A x2

(J1)

1

H-1
W

27 1/4 W

c

2

H-1

W

/4W

1

BZ

3.3K

NL

COM

R6

V

5

3ES

C

10u/35

14

SP1

3

TD

Q

D

0A

S27

S

1

D7

1
Y
R

12D1-1P(M)-R
U
D

M
O

NO

C

0A

S27

S

1

D8

1P(M)-R

-

RY2

DU12D1

NO

45

15K

1

P20

G

P21

P22

P23

P24

P25

P26

P27

5
Vx

0

0pF/5
3

- C64:3

C60

0Kx5
7

- R78:2

R74

5%
±

R60

K

15

2
G

R61

15K

R

3
G

R62

CLEA

15K

4
G

15K

R64

15K

R65

15K

R66

15K

R67

R63

R75

R76

R77

R78

R74

C60

C61

C62

C63

C64

5
G

6
G

7
G

8
G

2

REHEAT

STOP

CLEAR

*

G10

G9

68

69

R

15K

R

15K

P70

P71

W
G

4.00M

ST
C

40

P20
P21
P22

CF1

P23
P24
P25
P26
P27
VSS

XOUT
XIN
P70
P71

RESET

P40
P41

1M

R80

25

(G)

110

15K

R

1uF 25V

0

00.

C4

4.7K

R41

15K

R40

CPU UNIT

M

DOOR

S

A123J

4

T

Q

D

POWER UNIT

:IF NOT SPECIFIED 1/10W

NOTE

SS270A

SS270A

1

1

30

31

D

D

M

1

O

C

2

B-

B-

9

3

TIMER

CLOCK

5

8

1

4

START

*

S
U

PL

MINUTE

*

N

POPCOR

DEFROST

G11

G12

1

70

7

72

R

15K

R

15K

R

P41

P45

6

A

KEY UNIT

6

R

OWE

LEVEL

P

0

n be operated.
a

c
y

7

B

COOK

C

When door is close, Ke

*

G13

D

15K

(G)

E

Figure S-3. Control Unit Circuit

F

G

LD4LD3LD2

LD1

H

1

2

AC(N)

OVEN LAMP

3

TURNTABLE

MOTOR

FAN MOTOR

AC(H)

DOOR

SENSING

POWER

TRANSFORMER

SWITCH

45

6

H

18

R-508HS

1

A

B

C

D

E

2

CN-F

1 2 3

3

J3

R90

D31

CN-B

R6

C5

2

1

E C B

D30

J1

J6

E C B

Q3 Q4

D8

SP1

D5

T1

R4

45

DIP

CHIP
SIDE

C10

C4

LED

R3

D6

R5

J5

Q2

E C B

J2

WH-2

2

DZ1

WH-2

EB

R2

112

Q1

R7

6

A

B

C

D

E

RY2

R8

F

PS

L1

VRS1

G

D1C1D2

D3

D4

F

G

C2

RY1

H

D7

H

Figure S-5 . Printed Wiring Board of Power Unit

1

2

3

45

6

19

R-508HS

PARTS LIST

Note: The parts marked “

The parts marked “*” are used in voltage more than 250V. "§" MARK: PARTS DELIVERY SECTION.

REF. NO. PART NO. § DESCRIPTION Q'TY CODE

1- 1 RC-QZB018MRE0 M High voltage capacitor 1 AQ
1- 2 FH-DZB013MRY0 M High voltage rectifier assembly 1 AM
1- 3 RLMPTA087WRZZ M Oven lamp/socket 1 AD
1- 4 RMOTEA346WRE0 M Fan motor 1 AR
1- 5 FFS-BA019/KIT M
1- 6 QSW-MA085WRE0 M
1- 7 QFS-TA014WRE0 M Cavity temperature fuse 150

∆

1- 8 RV-MZA293WRE0 M Magnetron 1 BC
1- 9 RMOTDA252/KIT M Turntable motor 1 AL
1-10 RTRN-B075MRE0 M Power transformer 1 BA
1-11 FACCDB003MRE0 M Power supply cord 1 AM

2- 1 GDAI-B070MRP0 M Base plate 1 AQ
2- 2 GLEGPB004MRF0 M Foot 4 AB
2- 3 GCABUB130MRP0 M Outer case cabinet 1 BA

3- 1 GPNLCB041/KIT M Control unit assy 1 AZ
3- 2 HPNLFB008MRF0 M Control panel sub assembly 1 AQ
3- 3 PSHEPB128MRR0 M Graphic sheet 1 AF
3- 4 FDECAB046MRK0 M Open button assy 1 AF
3- 5 MSPRCA045WRE0 M Open button spring 1 AA
3- 6 XEPSD30P06XS0 M Screw; 3mm x 6mm 5 AB

∆∆

∆” may cause undue microwave exposure.

∆∆

ELECTRIC PARTS

Monitor switch (V-16G-2C25), C/T fuse (20A 250V AC) & Inst.
Primary interlock switch and door sensing switch (V-5230Q)

O

C 1AF

CABINET PARTS

CONTROL PANEL PARTS

1AF
2AE

OVEN PARTS

4- 1 LBNDKB007MRP0 M H.V. Capacitor band 1 AB
4- 2 LANGTB059MRP0 M Chassis support 1 AG
4- 3 PHOK-B018MRF0 M Latch hook 1 AF
4- 4 MLEVPB016MRF0 M Switch lever 1 AD
4- 5 PDUC-B125MRF0A M Magnetron duct 1 AE
4- 6 NFANPB006MRE0 M Fan blade 1 AC
4- 7 PDUC-B088MRF0 M Fan duct 1 AC
4- 8 ------------- M Oven cavity (Not a replaceable part) 1 -­4- 9 PCOVPB085MRP0 M Waveguide cover 1 AV
4-10 PPACGB014MRF0 M Turntable motor packing 1 AA
4-11 PCUSU0464MRE0 M Cushion 1 AC

DOOR PARTS

5 -1 CDORFB344MRK0A M Door assembly 1 BE
5 -2 FCOV-B250MRK0 M Door frame assembly 1 BC
5 -3 LSTPPB021MRF0 M Latch head 1 AE
5 -4 MSPRTA046WRE0 M Latch spring 1 AB
5 -5 FDORFB075MRT0 M Door panel 1 AX
5- 6 PSHEPB016MRE0 M Sealer film 1 AD
5- 7 GCOVHB047MRF0 M Choke cover 1 AG
5- 8 LSTPPB045MRF0 M Door stopper 1 AA
5- 9 JBTN-B152MRF0 M Button (start/stop/minute) 3 AD
5-10 MSPRTB022MRE0 M Button spring 3 AC

20

REF. NO. PART NO. § DESCRIPTION Q'TY CODE

MISCELLANEOUS

6- 1 FW-VZB125MRE0 M Stop switch harness 1 AF
6- 2 FW-VZB217MRE0 M Main wire harnes 1 AU
6- 3 FROLPB025MRK0 M Turntable support 1 AN
6- 4 NTNT-A099WRE0 M Turntable tray 1 AT
6- 5 TCAUAB050MRR0 M Monitor caution label 1 AA
6- 6 TCAUAB038MRR0 M DHHS/Screw caution label 1 AB
6- 7 TINSEB361MRK0 M Operation manual 1 AD
6- 8 QW-QZB016MRE0 M High voltage wire A 1 AC

SCREWS,NUTS AND WASHERS

7- 1 LX-BZA041WRE0 M Special screw 5 AA
7- 2 LX-CZ0052WRE0 M Special screw 2 AA
7- 3 XHTSD40P12RV0 M Screw : 4mm x 12mm 1 AA
7- 4 XOTSE40P12000 M Screw : 4mm x 12mm 12 AA
7- 5 XCBSD30P08000 M Screw : 3mm x 8mm 3 AA
7- 6 XHTSD40P08RV0 M Screw : 4mm x 8mm 3 AA
7- 7 LX-CZA070WRE0 M Special screw (Torx tamper proof screw) 2 AB
7- 8 XOTSE40P12000 M Special screw 4 AA

R-508HS

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.

21

R-508HS

1

OVEN AND CABINET PARTS

A

B

C

2

3

45

6

7-4

A

7-4

7-7

2-3

7-8

B

4-7

7-7

7-5

1-7

6-6

C

1-4

7-8

4-6

1-11

7-3

7-6

D

4-8

7-6

1-5

D

4-2

7-4

E

4-9

6-5

1-8

7-4

E

7-2

6-4

4-10

1-9

F

6-3

7-5

2-1

1-10

7-4

7-2

4-3

7-1

4-4

1-6

1-6

1-5

7-1

1-3

4-5

F

4-1

1-1

G

1-2

G

7-4

2-2

7-4

2-2

2-2

7-4

4-11

2-2

H

1

2

3

45

6

H

22

R-508HS

1

CONTROL PANEL PARTS

A

B

C

3-3

2

3

45

6

A

3-2

3-1

3-6

B

3-5

DOOR PARTS

3-4

C

5-1

5-8

5-6

D

5-2

5-5

E

5-3

5-4

5-9

5-10

F

5-7

D

E

F

MISCELLANEOUS

Items 5-9 & 5-10 are not included with assembly 5-1 or 5-2

6-1

G

6-2

G

6-8

Actual wire harness may be different from illustration.

H

1

2

3

45

6

H

23

R-508HS

PACKING AND ACCESSORIES

DOOR PROTECTION SHEET

6-4 TURNTABLE TRAY

ON

TOP

OF

TH

E O

TOP PAD ASSEMBLY

PLASTIC BAG

V

EN

TRAY HOLDER

6-7 OPERATION MANUAL

6-3 TURNTABLE SUPPORT

NT

I

PACKING CASE

O THE OV

N CAVITY

E

BOTTOM PAD ASSEMBLY

n-replaceable

o

N

tem

i

s

24

R-508HS

COPYRIGHT © 2003 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.

25

2003 SHARP CORP. (4M2.00E) Printed in U.S.A