Sunbeam SBM6500W Microwave Oven Owner’s Manual

: July 10, 2024
: Sunbeam

Table of Contents

SBM6500W Microwave Oven
Specifications
Product Usage Instructions
Safety Precautions
Installations
- FAQ
Q: Can this microwave oven be used for commercial
Q: What should I do if I suspect a malfunction with the
- EV#
- EV#
- EV#
- EV#
- EV#
- EV#
- EV#
- References
- Read User Manual Online (PDF format)
- Download This Manual (PDF format)

SBM6500W Microwave Oven

“`html

Specifications

Model: SBM6500W/SBM6500B
Power Requirement: 120 Volts AC 60 Hz
Power Output: 900 Watts (8.0 A)
Microwave Frequency: 2,450 MHz
Magnetron: 2M213
Timer: 0 ~ 35 min.
Outside Dimensions: 1715/16 (W) x 113/16 (H) x
125/8 (D)
Cavity Dimensions: 123/16 (W) x 731/32 (H) x
115/8 (D)
Net Weight: 24.7 lbs (approx.)
Shipping Weight: 26.9 lbs (approx.)
Control Complement: Mechanical Rotary System
Full Power Cooking

Product Usage Instructions

Safety Precautions

This device should only be serviced by qualified personnel. Read
the safety precautions in the manual before servicing.

Avoid exposure to excessive microwave energy by following these
precautions:

Do not operate the oven with the door open.
Perform safety checks before servicing.

Installations

Before You Begin:

Empty the microwave oven and clean it with a soft, damp
cloth.
Inspect for any damage.
Place the oven on a sturdy surface that can support its
weight.
Avoid blocking the vent and air intake openings.

Make sure the microwave oven legs are in place to ensure proper
airflow.

FAQ

Q: Can this microwave oven be used for commercial

purposes?

A: No, this microwave oven is designed for household use only
and is not recommended for commercial purposes.

Q: What should I do if I suspect a malfunction with the

microwave?

A: If you encounter any issues with the microwave oven, it is
recommended to contact qualified service personnel for
assistance.

“`

This Owner’s Manual is provided and hosted by Appliance Factory Parts.
SUNBEAM SBM6500B Owner’s Manual
Shop genuine replacement parts for SUNBEAM SBM6500B
Find Your SUNBEAM Microwave Parts – Select From 26 Models ——– Manual continues below ——–

website: http://www.lgservice.com e-mail: http://www.lgeservice.com/techsup.html

MICROWAVE OVEN SERVICE MANUAL
MODEL: SBM6500W/SBM6500B
CAUTION
BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

P/NO : 3828W5S2164

Feb., 2002 Printed in Korea

SAFETY PRECAUTIONS
This device is to be serviced only by properly qualified service personnel. Consult the service manual for proper service procedures to assure continued safety operation and for precautions to be taken to avoid possible exposure to excessive microwave energy.
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.

CONTENTS
(Page)
SAFETY PRECAUTIONS – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – Inside front cover SPECIFICATIONS – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – 1-1 CAUTIONS – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – 2-1 INSTALLATIONS – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – 3-1 OPERATING INSTRUCTIONS – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – 4-1
FEATURES- – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – 4-1 OPERATION CHECK – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – 4-1 OPERATING PROCEDURE – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – 4-1 SCHEMATIC DIAGRAM – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – 4-2 CIRCUIT DESCRIPTION – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – 4-3 SERVICE INFORMATION – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – 5-1 TOOLS AND MEASURING INSTRUMENTS – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – 5-1 MICROWAVE LEAKAGE TEST – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – 5-1 MEASUREMENT OF MICROWAVE POWER OUTPUT – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – 5-3 DISASSEMBLY AND ADJUSTMENT – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – 5-3 INTERLOCK CONTINUITY TEST- – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – 5-7 COMPONENT TEST PROCEDURE – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – 5-8 TROUBLE SHOOTING – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – 5-11 EXPLODED VIEW – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – 6-1 REPLACEMENT PARTS LIST – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – 7-1

ITEM
MODEL Power Requirement
Power Output Microwave Frequency Magnetron Timer Outside Dimensions Cavity Dimensions Net Weight Shipping weight Control Complement
Nameplate Location

SPECIFICATIONS
DESCRIPTION
SBM6500W/SBM6500B 120 Volts AC 60 Hz 900 Watts (8.0 A) Single phase, 3-wire grounded 600 Watts full microwave power (IEC60705) 2,450 MHz 2M213 0 ~ 35 min. 1715/16″ (W) x 113/16″ (H) x 125/8″ (D) 123/16″ (W) x 731/32″ (H) x 115/8″ (D) 24.7 lbs (approx.) 26.9 lbs (approx.) Mechanical Rotary System Full Power Cooking
Back Side

Accessories

Owner’s manual & cooking guide Glass turntable Rotating ring

This microwave oven is designed for household use only. It is not recommended for commercial purposes.

1-1

CAUTIONS

Unlike other appliances, the microwave oven is high-voltage and high-current equipment. Though it is free from danger in ordinary use, extreme care should be taken during repair.
· DO NOT operate on a 2-wire extension cord during repair and use.
· NEVER TOUCH any oven components or wiring during operation.
· BEFORE TOUCHING any parts of the oven, always remove the power plug from the outlet.
· For about 30 seconds after the oven stops, an electric charge remains in the high voltage capacitor. When replacing or checking, you must discharge the high voltage capacitor by shorting across the two terminals with an insulated screwdriver.

MICROWAVE RADIATION
Personnel should not be exposed to the microwave energy which may radiate from the magnetron or other microwave generating device if it is improperly used or connection. All input and output microwave connections, waveguide, flange, and gasket must be secure never operate the device without a microwave energy absorbing load attached. Never look into an open waveguide or antenna while the device is energized.
· Proper operation of the microwave oven requires that the magnetron be assembled to the waveguide and cavity. Never operate the magnetron unless it is properly installed.
· Be sure that the magnetron gasket is properly installed around the dome of the tube whenever installing the magnetron.

· Remove your watches whenever working close to or replacing the Magnetron.
· NEVER operate the oven with no load. · NEVER injure the door seal and front plate of the oven
cavity. · NEVER put iron tools on the magnetron. · NEVER put anything into the latch hole and the
interlock switches area.

ANTENNA

Gasket

FILAMENT TERMINALS

COOLING FIN
MAGNETRON CHASSIS GROUND
MAGNETRON

THE OVEN IS TO BE SERVICED ONLY BY PROPERLY QUALIFIED SERVICE PERSONNEL.

2-1

INSTALLATIONS

BEFORE YOU BEGIN, READ THE FOLLOWING INSTRUCTIONS COMPLETELY AND CAREFULLY.

INSTALLING
1. Empty the microwave oven and clean inside it with a soft, damp cloth. Check for damage such as misaligned door, damage around the door or dents inside the cavity or on the exterior.
2. Put the oven on a counter, table, or shelf that is strong enough to hold the oven and the food and utensils you put in it. (The control panel side of the oven is the heavy side. Use care when handling.)
3. Do not block the vent and the air intake openings. Blocking vent or air intake openings can cause damage to the oven and poor cooking results. Make sure the microwave oven legs are in place to ensure proper air flow.
4. The oven should not be installed in any area where heat and steam are generated, because they may damage the electronic or mechanical parts of the unit. Do not install the oven next to a conventional surface unit or above a conventional wall oven.
5. Use microwave oven in an ambient temperature less than 104°F (40°C).
6. Place the microwave oven on a sturdy and flat surface at least 10 cm (4 inches) from the wall.
7. Place the microwave oven as far away as possible from TV, RADIO, COMPUTER, etc., to prevent interference.
10cm

GROUNDING INSTRUCTIONS
For personal safety, this appliance must be fully grounded at all times. In the event of an electrical short circuit, grounding reduces the risk of electrical shock. The plug must be plugged into an outlet that is properly installed and grounded.
WARNING
Improper use of the grounding plug can result in a risk of electric shock. Do not, under any circumstances, cut or remove the third ground prong from the power cord plug.
PREFERRED METHOD
ENSURE PROPER GROUND EXISTS BEFORE USE
TEMPORARY METHOD (ADAPTER PLUGS NOT PERMITTED IN CANADA) ALIGN LARGE PRONGS/SLOTS

ENSURE PROPER GROUND AND FIRM CONNECTION BEFORE USE

3-1

OPERATING INSTRUCTIONS
FEATURES

Oven Front Plate Window Door Screen
Door Seal

Power Knob Timer Knob
Safety Door Lock System Turntable Rotating Ring

WARM

LOW

HIGH

MEDIUM

OPERATION CHECK

After unpacking this appliance, examine the new oven for evidence of shipping damage. This is most important since a damaged oven may allow the escape of microwave energy. Make sure you remove all packing from the microwave cavity. Check the oven operation when unpacking the unit and any time the oven is not working properly.
1. Plug the power cord into an earthed electrical socket.

2. Place the glass tray inside the oven cavity. 3. Place a cup of water (at room temperature) inside
the oven, on the glass tray. 4. Close the door securely. 5. Set the Timer for 3 to 4 minutes (note : microwave
activity starts). 6. When the cooking time has elapsed, the signal will
sound (note: all microwave activity stops). 7. If the oven is operating normally, the water will be
hot.

OPERATING PROCEDURE

The microwave oven is designed to be simple and easy to operate. Please follow these instructions carefully.
1. Place the food in a suitable cooking utensil. Open the microwave oven door and place the utensil in the center of the oven on the glass tray.
2. Close the oven door. 3. Turn the TIMER KNOB clockwise to set the
cooking time. 4. When the TIMER reaches OFF, the signal sounds
and the oven will automatically shut off. 5. Open the door and remove the food from the
oven.

6. To stop cooking before the timer reaches OFF, either open the door or simply turn the timer to OFF.
NOTE : 1. The oven starts as soon as the KNOB is turned.
We recommend turning the KNOB past the time you want and then turn back to the desired setting.
2. The door can be opened during the cooking process by pushing the Door Open Button. The timer will stop and the microwave activity will cease. When the door is closed, cooking will resume until the full cooking time has elapsed. After cooking is finished, the Timer will be at OFF.

4-1

SCHEMATIC DIAGRAM
4-2

IMPORTANT SAFETY NOTE: THE SHADED AREAS ON THIS SCHEMATIC DIAGRAM INCORPORATE SPECIAL FEATURES IMPORTANT FOR PROTECTION FROM MICROWAVE RADIATION, FIRE, ELECTRICAL SHOCK, AND HAZARDS. WHEN SERVICING IT IS ESSENTIAL THAT ONLY MANUFACTURER’S SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SHADED AREAS OF THE SCHEMATIC DIAGRAM.
NOTICE: SINCE THIS IS BASIC SCHEMATIC DIAGRAM, THE VALUES OF COMPONENTS AND SOME PARTIAL CONNECTIONS ARE SUBJECT TO CHANGE FOR IMPROVEMENT.

CIRCUIT DESCRIPTION

GENERAL DETAILS
· When the door is closed, the primary switch is ON, the secondary switch is ON, and the monitor switch opens (contact COM and NO).
· The latches are secured by the latch board, the oven light turns on while the oven is operation.
WHEN THE TIMER KNOB IS ROTATED
· When the timer knob is rotated, the contacts of timer switch close.
· The contact of the secondary switch close the circuit. · Power input is supplied to the high voltage transformer
through the fuse to the primary timer and secondary switches. · Turntable rotates · The fan motor rotates and cools the magnetron by blowing air (coming from the intake on the baseplate). · The air is also directed into the oven to exhaust the vapor in the oven through the upper plate. · Cooking time starts counting down.

FUSE

P/S

T/S

S/S

· A high voltage of approximately 2100 volts AC is generated in the secondary of the high voltage transformer which is increased by the action of the high voltage diode and charging of the high voltage capacitor.
· The negative 4,000 Volts DC is applied to the filament of the magnetron.
WHEN THE DOOR IS OPENED DURING
COOKING
· Both the primary and timer switches are cut off primary winding voltage of the high voltage transformer.
· When the door is opened, the secondary switch is opened and when the door is closed, the secondary switch is closed.
· The timer, turntable and fan motor stop. · As the door is opened, if the contact of primary switch
fail to open, the fuse opens due to the large current surge caused by the monitor switch activation, which, in turn, stops magnetron oscillation.

FUSE P/S

T/S

S/S

H.V. TRANSFORMER

H.V.

M/S

TRANS-

FORMER

P/S : Primary Switch T/S : Tiemr Switch S/S : Secondary Switch
· 3.2 volts AC is generated from the filament winding of the high voltage transformer. This 3.2 volts is applied to the magnetron to heat the magnetron filament through two noise-preventing choke coils.

P/S : Primary Switch T/S : Tiemr Switch M/S : Monitor Switch S/S : Secondary Switch

4-3

SERVICE INFORMATION

TOOLS AND MEASURING INSTRUMENTS

NECESSARY TOOLS
Tools normally used for TV servicing are sufficient. Standard tools are listed below.
· Diagonal pliers · Long nose pliers · Phillips screwdriver · Flat blade screwdriver · Wrench (size 5mm) · Nutdriver (size 5mm) · Adjustable wrench · Soldering iron · Solder · Vinyl insulation tape · Polishing cloth

NECESSARY MEASURING INSTRUMENTS
· TESTER (VOLTS-DC, AC, Ohmmeter) · Microwave survey meter
– Holaday HI-1500 HI-1501
– Narda 8100 8200
· Inch scale · 600 cc non conductive material beaker (glass or plastic),
inside diameter: approx. 8.5 cm (31/2 in.) · Cylindrical and made of borosilicate glass vessel.
max. thickness: 3 mm outside diameter: approx. 190mm height: approx. 90mm · Glass thermometer: 100°C or 212°F (1 deg scale)

MICROWAVE LEAKAGE TEST

CAUTIONS

MEASURING MICROWAVE ENERGY

· Be sure to check microwave leakage prior to

LEAKAGE

servicing the oven if the oven is operative prior to servicing. · The service personnel should inform the manufacturer, importer, or assembler of any certified oven unit found to have a microwave emission level in excess of 5 mW/cm2 and should repair any unit found to have excessive emission levels at no cost to the owner and should ascertain the cause of the excessive leakage. The service personnel should instruct the owner not to use the unit until the oven has been brought into compliance.

· Pour 275±15cc of 20±5°C (68±9°F) water in a beaker which is graduated to 600 cc, and place the beaker on the center of the turntable.
· Set the energy leakage monitor to 2,450 MHz and use it following the manufacturer’s recommended test procedure to assure correct result.
· When measuring the leakage, always use the 2inch (5 cm) spacer supplied with the probe.
· Operate the oven at its maximum output. · Measure the microwave radiation using and

· If the oven operates with the door open, the service

electromagnetic radiation monitor by holding the

personnel should: – Tell the user not to operate the oven.

probe perpendicular to the surface being measured

– Contact the manufacturer and CDRH (Center for Devices and Radiological Health)

Move probe along shaded area

immediately. NOTE: Address on CDRH
Office of Compliance(HFZ-312) Center for Devices and Radiological

Probe scanning speed Less than 2.5 cm/sec (1 in/sec)

Healthe 1390, Piccard Drive,

Rockville. MD 20850

· The service personnel should check all surface and

vent openings for microwave leakage.

· Check for microwave leakage after every servicing.

The power density of the microwave radiation leakage

emitted by the microwave oven should not exceed

4 mW/cm2. Always start measuring of an unknown field

to assure safety for operating personnel from radiation

leakage.

5-1

MEASUREMENT WITH OUTER CASE REMOVED
· When you replace the magnetron, measure for microwave energy leakage before the outer case is installed and after all necessary components are replaced or adjusted. Special care should be taken in measuring the following parts. (Circled area of Fig. below) – Around the magnetron – The waveguide
WARNING : AVOID CONTACTING ANY HIGH VOLTAGE PARTS
MEASUREMENT WITH A FULLY ASSEMBLED OVEN
· After all components, including the outer case, are fully assembled, measure for microwave energy leakage around the door viewing window, the exhaust opening, and air inlet openings.
· Microwave energy leakage must not exceed the values prescribed below. NOTE: Leakage with the outer case removedless than 5 mW/cm.sq. Leakage for a fully assembled oven (Before the latch switch (primary) is interrupted) with the door in a slightly opened position-less than 2 mW/cm.sq.

NOTES WHEN MEASURING
· Do not exceed meter full scale deflection. · The test probe must be removed no faster than
1 inch/sec (2.5 cm/sec) along the shaded area, otherwise a false reading may result. · The test probe must be held with the grip portion of the handle. A false reading may result if the operator’s hand is between the handle and the probe. · When testing near a corner of the door, keep the probe perpendicular to the surface making sure the probe horizontally along the oven surface; this may cause probe damage.
RECORD KEEPING AND NOTIFICATION AFTER MEASUREMENT
· After adjustment and repair of any microwave energy interruption or microwave energy blocking device, record the measured values for future reference. Also enter the information on the service invoice.
· The microwave energy leakage should not be more than 4 mW/cm.sq. after determining that all parts are in good condition, functioning properly and genuine replacement parts which are listed in this manual have been used.
· At least once a year, have the electromagnetic energy leakage monitor checked for calibration by its manufacturer.
SPECIAL TIP
· This oven used the button head screws.
Button Head (Torx style 2)
· When you remove the screws, use the tamper-resistant Torx driver having a pin-in-head.

5-2

MEASUREMENT OF MICROWAVE POWER OUTPUT

· Microwave power output measurement is made with the microwave oven supplied at its rated voltage and operated at its maximum microwave power setting with a load of (1000±5) g of potable water.
· The water is contained in a cylindrical borosilicate glass vessel having a maximum material thickness of 3 mm and an outside diameter of approximately 190mm.
· The oven and the empty vessel are at ambient temperature prior to the start of the test.
· The initial temperature (T1) of the water is (10±2)°C It is measured immediately before the water is added to the vessel. After addition of the water to the vessel, the load is immediately placed on the center of the turntable which is in the lowest position and the microwave power switched on.
· The time T for the temperature of the water to rise by a value T of (10±2)° is measured, where T is the time in seconds and T is the temperature rise. The initial and final water temperatures are selected so that the maximum difference between the final water temperature and the ambient temperature is 5°.

· The microwave power output P in watts is calculated from the following formula :

P =

4187 x (T)

T

is measured while the microwave generator is operating at full power. Magnetron filament heat-up time is not included. (about 3 sec) · The water is stirred to equalize temperature throughout the vessel, prior to measuring the final water temperature. · Stirring devices and measuring instruments are selected in order to minimize addition or removal of heat.

WATER LOAD

TURNTABLE

DISASSEMBLY AND ADJUSTMENT
A. OUTER CASE REMOVAL

Disconnect the power supply cord from the outlet. 2) Remove the screws from the rear of the case.
The outer case must be moved backward to be lifted off.
B. POWER SUPPLY CORD
Remove the outer case. 2) Disconnect two terminals and remove one screw of
the ground terminal.
C. CONTROL PANEL ASSEMBLY
Open the door. 2) Remove the screws for securing the control panel. 3) Disconnect the leadwire from motor timer. 4) Lift up and pull out control panel assembly carefully
from the cavity.

Remove the screw

securing sc

Lift up and pull out control panel

CAUTION: DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE SERVICING (Refer to page 2-1)

5-3

D. TIMER MOTOR REMOVAL

Remove the control panel assembly from the cavity. (Refer to control panel assembly removal on previous page.)
Remove screws which hold the timer motor to the control panel.
Removed the timer knob. 4) Remove the door open button.
Control Panel Powr Knob
Timer Knob Motor

E. DOOR GROSS ASSEMBLY REMOVAL

Open the door. 2) Remove the choke cover very carefully with a
flat-blade screwdriver. CAUTION : Be careful not to damage door seal plate
by screwdriver. 3) Lift up and push the door.
NOTE: 1. After replacing the door, be sure to check that the
primary switch, monitor switch, and secondary switch operate normally. 2. After replacing the door, check for microwave energy leakage with a survey meter. Microwave energy must be below the limit of 5 mW/cm. (with a 275 ml water load) 3. When mounting the door assembly to the oven assembly, be sure to adjust the door assembly parallel to the chassis. Also, adjust so the door has no play between the inner door surface and oven frame assembly. If the door assembly is not mounted properly, microwaves may leak from the clearance between the door and the oven.
Remove choke cover

Remove door 5-4

F. HIGH VOLTAGE TRANSFORMER
REMOVAL

Discharge the high voltage capacitor. 2) Disconnect the leadwire from magnetron, high voltage
transformer, and capacitor. 3) Remove the screw holding the high voltage
transformer to the baseplate.
G. FAN MOTOR ASSEMBLY REMOVAL
Discharge the high voltage capacitor. 2) Disconnect the leadwire from fan motor, and high
voltage capacitor. 3) Remove the two screws holding the the suction guide
assembly to the oven cavity and remove the high voltage diode earth screw. 4) Remove the two screws holding the fan motor assembly to the suction guide assembly.
H. HIGH VOLTAGE CAPACITOR AND DIODE REMOVAL
Discharge the high voltage capacitor. 2) Disconnect the leadwire from fan motor, and high
voltage capacitor. 3) Remove the screw holding the suction guide
assembly to the oven cavity and remove the high voltage diode earth screw. 4) Remove the screw holding the high voltage capacitor bracket.
Fan Motor ASS’Y

I. AIR DUCT ASSEMBLY REMOVAL

Disconnect the leadwire from lamp. 2) Remove the mounting screw to Latch Board.
J. MAGNETRON REMOVAL
Disconnect the leadwire from the high voltage transformer.
Carefully remove the mounting screws holding the magnetron to the waveguide.
Remove the magnetron assembly until the tube is clear from the waveguide.
NOTE: 1. When removing the magnetron, make sure its
dome does not hit any adjacent parts, or it may be damaged. 2. When replacing the magnetron, be sure to install the magnetron gasket in the correct position and be sure that the gasket is in good condition. 3. After replacing the magnetron, check for microwave leakage with a survey meter around the magnetron. Microwave energy must be below the limit of 5 mW/cm2. (With a 275 ml. water load). Make sure that gasket is rigidly attached to the magnetron. To prevent microwave leakage, tighten the mounting screws properly, making sure there is no gap between the waveguide and the magnetron.
Magnetron

H.V. Transformer

Suction Guide
H.V. Capacitor
H.V. Diode

5-5

Magnetron
Magnetron Gasket Waveguide Bracket Dome
Waveguide

K. REMOVING THE TURNTABLE MOTOR

Remove the turntable. 2) Remove the turntable shaft VERY CAREFULLY
with a slotted screwdriver. 3) Lay the unit down on its back. 4) Remove the turntable motor cover.
The turntable base cover is easily removed by pinching the six parts with a wire cutting. 5) Disconnect the leadwire from the turntable motor terminals.
Remove the screw securing the turntable motor to the oven cavity assembly.
After repairing the motor, rotate the removed turntable motor cover. 8) Fit the turntable motor cover’s projecting part to the base plate slit.
NOTE: 1. Remove the wire lead from the turntable motor
VERY CAREFULLY. 2. Be sure to grasp the connector, not the wires, when
removing.

L. INTERLOCK SYSTEM

INTERLOCK MECHANISM The door lock mechanism is a device which has been specially designed to eliminate completely microwave activity when the door is opened during cooking and thus to prevent the danger resulting from the microwave leakage.
MOUNTING OF THE PRIMARY/MONITOR/ SECONDARY SWITCHES TO THE LATCH BOARD
ADJUSTMENT DIRECTION
PRIMARY SWITCH
MONITOR SWITCH

SECONDARY SWITCH

INSTALLATION AND ADJUSTMENT OF THE LATCH BOARD TO THE OVEN ASSEMBLY
· Mount the latch board to the oven assembly. · Adjust the latch board in the arrow direction so that
oven door will not have any play in it when the door is closed. · Tighten the mounting screw. · Check for play in the door by pushing the door release button. Door movement should be less than 0.5 mm. (1/64 inch) Don’t push the door release button while making adjustment. Make sure that the latch moves smoothly after adjustment are completed and that the screws are tight. Make sure the primary, monitor, and secondary switches operate properly by following the continuity test procedure.

Wire Leads Turntable Motor

5-6

INTERLOCK CONTINUITY TEST

WARNING : FOR CONTINUED PROTECTION AGAINST EXCESSIVE RADIATION EMISSION, REPLACE ONLY WITH IDENTICAL REPLACEMENT PARTS. ALL THESE SWITCHES MUST BE REPLACED AT THE SAME TIME.

TYPE NO. SZM-V 16-FA-63 OR VP-533A-OF OR V-5230Q FOR PRIMARY SWITCH TYPE NO. SZM-V 16-FA-62 OR VP-532A-OF OR V-5220Q FOR MONITOR SWITCH TYPE NO. SZM-V 16-FA-63 OR VP-533A-OF OR V-5230Q FOR SECONDARY SWITCH

A. PRIMARY INTERLOCK SWITCH TEST
When the door release button is depressed slowly with the door closed, an audible click should be heard at the same time or successively at intervals. When the button is released slowly, the latches should activate the switches with an audible click. If the latches do not activate the switches when the door is closed, the switches should be a adjusted in accordance with the adjustment procedure. Disconnect the wire lead from the primary switch. Connect the ohmmeter leads to the common (COM) and normally open (NO) terminal of the switch. The meter should indicate an open circuit in the door open condition. When the door is closed, the meter should indicate a closed circuit. When the primary switch operation is abnormal, make the necessary adjustment or replace the switch only with the same type of switch.

B. SECONDARY INTERLOCK SWITCH TEST
Disconnect the wire lead from the secondary switch. Connect the ohmmeter leads to the common (COM) and normally open (NO) terminals of the switch. The meter should indicate a open circuit in the door open condition. When the door is closed, meter should indicate an closed circuit. When the secondary switch operation is abnormal, make the necessary adjustment or replace the switch only with the same type of switch.
C. MONITOR SWITCH TEST
Disconnect the wire lead from the monitor switch. Connect the ohmmeter leads to the common (COM) and normally closed (NC) terminals of the switch. The meter should indicate closed circuit in the door open condition. When the door is closed, meter should indicate an open circuit. When the monitor switch operation is abnormal, replace with the same type of switch. NOTE: After repairing the door or the interlock system, it is necessary to do this continuity test before operating the oven.

COMPONENTS
SWITCHES (Wire leads removed)

TEST PROCEDURE
Check for continuity of the switch with an Ohm-meter

RESULTS

Door open

Door closed

Primary

NO COM

NT

Switch

Monitor Switch
Secondary Switch

NC COM
NO COM

NT

ADJUSTM

DIRECTIO

NT

NOTE : After checking for the continuity of switches, make sure that they are connected correctly.
5-7

COMPONENT TEST PROCEDURE

CAUTIONS
1. DISCONNECT THE POWER SUPPLY CORD FROM THE OUTLET WHENEVER REMOVING THE OUTER CASE FROM THE UNIT. PROCEED WITH THE TEST ONLY AFTER DISCHARGING THE HIGH VOLTAGE CAPACITOR AND REMOVING THE WIRE LEADS FROM THE PRIMARY WINDING OF THE HIGH VOLTAGE TRANSFORMER. (SEE PAGE 2-1)
2. ALL OPERATIONAL CHECKS WITH MICROWAVE ENERGY MUST BE DONE WITH A LOAD (1 LITER OF WATER IN CONTAINER) IN THE OVEN.

COMPONENTS
HIGH VOLTAGE TRANSFORMER (Wire leads removed)

TEST PROCEDURE

RESULTS

FILAMENT WINDING

MAGNETRON (Wire leads removed)

SECONDARY

PRIMARY TERMINAL
1. Measure the resistance. (Ohm-meter scale: Rx1 and Rx100) · Primary winding · Secondary winding · Filament winding
2. Measure the resistance. (Ohm-meter scale: Rx1000) · Primary winding to ground · Filament winding to ground
1. Measure the resistance. (Ohm-meter scale: Rx1) · Filament terminal
2. Measure the resistance. (Ohm-meter scale: Rx1000) · Filament to chassis

Approx.: 0.3 ~ 0.8 ohm Approx.: 100 ~ 200 ohm Less than: 1 ohm
Normal: Infinite Normal: Infinite Normal: Less than 1 ohm
Normal: Infinite

5-8

COMPONENTS

TEST PROCEDURE
Antenna Gasket Chassis

RESULTS

HIGH VOLTAGE CAPACITOR

Filament

NOTE: When testing the magnetron, be sure to install the magnetron gasket in the correct position and be sure that the gasket is in good condition.

Measure the resistance. (Ohm-meter scale: Rx1000) · Terminal to terminal.

Normal: Momentarily indicates several ohms, and then gradually returns to infinite.

Measure the resistance. (Ohm-meter scale: Rx1000) · Terminal to case.

Normal: Infinite.

HIGH VOLTAGE DIODE

Measure the continuity (Forward). (Ohm-meter scale: Rx10000)

Normal: Continuity. Abnormal: Infinite.

NOTE : Some inexpensive meters may indicate infinite resistance in both direction.

Measure the continuity (Reverse). (Ohm-meter scale: Rx10000)

Normal: Infinite. Abnormal: Continuity.

5-9

COMPONENTS
RELAY 2

TEST PROCEDURE
Check for continuity of relay 2 with an ohm-meter. (Remove wire leads from relay 2 and operate the unit.)
Relay 1
Relay 2

RESULTS

POWER LEVEL

1

4 sec 18 sec

2

6 sec 16 sec

3

8 sec 14 sec

4

10 sec 12 sec

5

12 sec 10 sec

6

14 sec

8 sec

7

16 sec

6 sec

8

18 sec

4 sec

9

20 sec

2 sec

10

22 sec

0 sec

FAN MOTOR (Wire leads removed)

Measure the resistance. (Ohm-meter scale: R x 100)
B(BK) A(RD)
C(WH)

Normal: A~B : Approx. 65 ~ 80 ohm B~C : Approx. 10 ~ 30 ohm A~C : Approx. 85 ~ 105 ohm
Abnormal: Infinite or several ohm.

TURNTABLE MOTOR (Wire leads removed)

Measure the resistance. (Ohm-meter scale: R x 1000)

Normal: Approx. 100 ~ 150 ohm Abnormal: Infinite or several
ohms.

NOTE : · A MICROWAVE LEAKAGE TEST MUST ALWAYS BE PERFORMED WHEN THE UNIT IS SERVICED FOR ANY REASON.
· MAKE SURE THE WIRE LEADS ARE IN THE CORRECT POSITION. · WHEN REMOVING THE WIRE LEADS FROM THE PARTS, BE SURE TO GRASP THE
CONNECTOR, NOT THE WIRES.
5-10

TROUBLE SHOOTING
WHEN YOU GET A COMPLAINT FROM YOUR CUSTOMER, EVALUATE THE COMPLAINT CAREFULLY. IF THE FOLLOWING SYMPTOMS APPLY, PLEASE INSTRUCT THE CUSTOMER IN THE PROPER USE OF THE MICROWAVE OVEN. THIS CAN ELIMINATE AN UNNECESSARY SERVICE CALL.
CAUTIONS
1. Check grounding before checking for trouble. 2. Be careful of the high voltage circuit. 3. Discharge the high voltage capacitor. (See page 2-1) 4. When checking the continuity of the switches or of the high voltage transformer, disconnect one lead wire
from these parts and then check continuity with the AC plug removed. To do otherwise may result in a false reading or damage to your meter.

CONDITION
Microwave oven does not work.
Output power is too low.
Sparks occur.
Uneven cooking.

CAUSE
Inserting many plugs into one outlet and using them at the same time (blown fuse or breaker)
Microwave oven plug is not inserted tightly.
Low AC input voltage.
Food temperature is too low.
Using metallic ware and allowing it to touch the oven wall.
Ceramic ware trimmed in gold or silver powder is used.
Inconsistent intensity of microwave by their characteristics.

REMEDY
Avoid using other electrical appliances when you use the microwave oven.
Insert microwave oven plug securely.
Use the microwave oven at adequate line voltage.
This may not be a defect. It is possible that the food should be cooked for a longer time period.
Do not use metallic ware for cooking except where noted in the cooking guide.
Do not use any type of cookware with metallic trimming.
1. Use plastic wrap or lid. 2. Stir once or twice while
cooking soup, cocoa or milk, etc.

5-11

(TROUBLE 1) Oven does not operate at all and no input is accepted.

CONDITION
1. Fuse blows.

CHECK
Check continuity of monitor switch (with door closed).
Replace fuse
Check continuity of primary switch (with door opened).

RESULT
Continuity. No continuity.
Continuity. No continuity.

CAUSE
Malfunction of the monitor switch.

REMEDY
Replace fuse, primary, monitor, secondary switches.

Shorted contact at the primary switch.

Replace fuse, primary, monitor, secondary switches.

Disconnect one side of the wire lead connected from transformer to the high voltage capacitor and operate the unit.

Normal. Fuse blows again

Defective high voltage capacitor.
Defective high voltage transformer.

Replace high voltage capacitor.
Replace high voltage transformer.

NOTE : All these switches must be replaced at the same time. Refer to page 5-6, 5-7

2. Fuse does not blow.

Check continuity of thermostat.

No continuity. Continuity.

Defective thermostat.

Replace thermostat.

Check continuity of power supply cord.

No continuity.

Defective power supply cord.

Replace power supply cord.

5-12

(TROUBLE 2) Oven seems to be operating but little heat is produced in oven load.

CONDITION

CHECK

RESULT

CAUSE

REMEDY

Output is low

Check the power source voltage.

Lower than 90% of rating voltage.
Normal

Decrease in power source voltage with load.

Suggest customer contact local electric power utility company or qualified electrician.

Measure the output power.

Abnormal

Defective magnetron.

Replace magnetron.

NOTE : Simple test of power output-conducted by heating one liter water for one min. if available. Minimum 8.5°C temperature rise is normal condition.

5-13

(TROUBLE 3) No microwave oscillation even though oven lamp and fan motor run.

CONDITION
No microwave oscillation.

CHECK
Check the timer switch of timer motor.(cooking state)

RESULT
No continuity. Continuity.

CAUSE
Defective timer motor.

REMEDY
Replace timer motor.

Check high voltage transformer

Abnormal Normal

Defective high voltage transformer.

Replace high voltage transformer.

Check high voltage capacitor.

Abnormal Normal

Defective high voltage capacitor.

Replace high voltage capacitor.

Check high voltage diode.

Abnormal Normal

Defective high voltage diode.

Replace high voltage diode.

Check magnetron.

Abnormal

Defective magnetron.

Replace magnetron.

NOTE : · Make sure the wire leads are in the correct position. · When removing the wire leads from the parts, be sure to grasp the connector, not the wires. · When removing the magnetron, be sure to install the magnetron gasket in the correct position and in good condition.

5-14