Panasonic NN-ST652W Schematic

Order No. MOD1006319 PE

Microwave Oven

Model No.

32L

White

Brazil

NN-ST652WRUN

NN-ST652WRUK

Power Requirement

Power Output

Microwave Frequency

Magnetron

Timer

Outside Dimensions

Internal Capacity

Weight

NN-ST652WRUN

127

VoltsAC60Hz

1,650 Watts (14.0 A)

Single phase, 3 wire grounded

900 Watts full microwave power (IEC60705)

2,450 MHz

2M219J

0 ~ 99 minutes and 50 seconds

520 325

(W) x (H)x416(D) mm

32 Litros

14.2kg (approx.)

Specifications subject to change without notice.

220

1,650 Watts (8.0 A)

Single phase, 3 wire grounded

NN-ST652WRUK

VoltsAC60Hz



Thisproductshouldbeservicedonlybytrainedqualifiedpersonnel.

Thisservicemanualcoversproductsforfollowingmarkets.

Whentroubleshootingorreplacingparts,pleaserefertothecountryidentificationsshownbelowforyour

applicableproductspecification.

WARNING 

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.

CAUTION

MICROWAVE RADIATION

DO NOT BECOME EXPOSED TO RADIATION FROM THE MICROWAVE GENERATOR OR OTHER PARTS CONDUCTING MICROWAVE ENERGY.

CONTENTS

(Page)

SAFETY PRECAUTIONS

SPECIFICATIONS

CAUTIONS

INSTALLATIONS

-----------------------------------------------------------------------------------------------------

--------------------------------------------------------------------------------------------------------------

------------------------------------------------------------------------------------------------------

OPERATING INSTRUCTIONS

FEATURES

CONTROL PANEL

OPERATING SEQUENCE

SCHEMATIC DIAGRAM

CIRCUIT DESCRIPTION

-----------------------------------------------------------------------------------------------------------------------

SERVICE INFORMATION

TOOLS AND MEASURING INSTRUMENTS

MICROWAVE LEAKAGE TEST

MEASUREMENT OF MICROWAVE POWER OUTPUT

DISASSEMBLY AND ADJUSTMENT

---------------------------------------------------------------------

------------------------------------------------------------------------------------

-------------------------------------------------------------------------------------------------------------

---------------------------------------------------------------------------------------------------

------------------------------------------------------------------------------------------------------

-----------------------------------------------------------------------------------------------------

------------------------------------------------------------------------------------------

--------------------------------------------------------------------------

--------------------------------------------------------------------------------------------

------------------------------------------------------------------------------------

Inside front cover

1-1

2-1

3-1

4-1

4-2

4-3

4-4

5-1

-----------------------------------------------------------

5-3

INTERLOCK CONTINUITY TEST

COMPONENT TEST PROCEDURE

TROUBLE SHOOTING

EXPLODED VIEW

REPLACEMENT PARTS LIST

-----------------------------------------------------------------------------------------------------

------------------------------------------------------------------------------------

SC HEM ATI C DIA GR AM O F P. C. B

-----------------------------------------------------------------------------------------

--------------------------------------------------------------------------------------

5-7

5-8

5-12

6-1

7-1

-------------------------------------------------------------------------------

8-1

POWER LEVEL & ACCESSORIES

ITEM

Control Complement

Rating Label Location

Accessories

This microwave oven is designed for household use only.

Microwave Power for Variable Cooking

Power level

Max

Medium High

Medium

Medium Low

Low

Instruction manual Glass Tray Ro Rller ing

900 Watts 720 Watts

540 Watts 270 Watts

90 Watts

Inside

DESCRIPTION

It is not recommended for commercial purposes.

1-1

• 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.

•

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.

• 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.

2-1

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.

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

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.

ANTENNA

COOLING FIN

MAGNETRON CHASSIS GROUND

FILAMENT TERMINALS

MAGNETRON

GASKET

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.

EARTHING INSTRUCTIONS

This microwave oven is designed to be used in a fully earthed condition. It is imperative, therefore, to make sure it is properly earthed before servicing

WARNINGTHIS APPLIANCE MUST BE EARTHED

IMPORTANT

The wires in this mains lead are colored in accordance with the following code:

Green-and-yellow: Earth Blue: Neutral Brown: Live

As the colors of the wires in the mains lead of this appliance may not correspond with the colored markings identifying the terminals in your plug, proceed as follows.

The wire which is colored green-and-yellow must be connected to the terminal in the plug which is marked with the letter E or by the earth symbol ( ) or colored green or green-and-yellow.

10cm

The wire which is colored blue must be connected to the terminal in the plug which is marked with the letter N or colored black.

The wire which is colored brown must be connected to the terminal in the plug which is marked with the letter L or colored red.

3-1

OPERATING INSTRUCTIONS

FEATURES

See-Through oven window

CONTROL PANEL

Door C

Oven Front Plate

Control Panel

Safety Door Lock System

Glass Tray

Roller Ring

(1)

(2)

(3)

(4)

(7)

(9)

(8)

(5) (6)

NN-

ST652W

(1)

Display

(2)

Power Selection Tab Number Tabs

(3)

Memory Tab

(4)

Timer / Clock Tab

(5)

+ 30 sec. Tab

(6)

Auto Cook Options

(7)

Defrost Tab

(8)

Serving / Weight Tab

(9)

Stop / Cancel Tab

(10)

Before Cooking: During Cooking:

process. Another tap cancels

Start Tab

(11)

One tap begins oven

Beep Sound:

When a pad is pressed correctly, a beep will be heard. If a pad is pressed and no beep is heard, the unit did not or cannot accept the instruction. The oven will beep twice between

complete program, the oven will beep 5 times.

one tap cancels one tap

functioning.

programmed stages. At the end of any

ST652W

the inserted instructions.

temporarily stops the cooking

cooking.

(10)

(11)

4-1

OPERATING SEQUENCE

The following is a description of component functions during oven operation.

1. SETTING THE CLOCK

Stop/

Cancel

NOTE: This is a 12 hour clock.

Clock

Set the time

by pressing time pads

Clock

2. CANCEL FUNCTION

Touch the S /Cancel pad whenever you need to

cancel an entry or a function currently in use. The display will either return to the last item entered or to the clock.

top

3. MICROWAVE COOKING

Stop/Cancel

TIME START

4. AUTO DEFROST COOKING

Stop/

Cancel

Desired

defrost

program

Desired weight

Start

5. CHILD SAFETY LOCK

Using this system will make the oven inoperable; however,

the door can be opened.Child Lock can be set when the

display shows a colon or the time.

TO Set

Start

Press Start Pad 3 consecutive times.

The display will the indication on the word LOCK.

It indicates no programming will be accepted.

To Cancel

Stop/ Cancel

Press Stop/ Pad 3 consecutive times. The colon or the time will be displayed again on the display. In case of plug disconnection or energy shortage,the lock will be automatically canceled.

Reset

4-2

SCHEMATIC DIAGRAM

4-3

CIRCUIT DESCRIPTION

GENERAL DETAILS

• The low voltage transformer supplies the necessary voltage to the micom controller when power cord is plugged in.

• When the door is closed, the primary switch is ON, the

secondary switch is ON, and the monitor switch opens (contact COM and NO).

WHEN SELECTING COOKING POWER LEVEL AND TIME

• The micom controller memorizes the function you set.

• The time you set appears in the display window.

• Each indicator light turns on to indicate that the stage

has been set.

WHEN TOUCHING THE START PAD

• The coil of the relay is energized by the micom

controller.

• Power input is supplied to the high voltage transformer

through the fuse to the primary switch and relay 2.

• Turntable rotates.

FUSE

MICOM CONTROLLER

PRIMARY

SWITCH

RELAY 2

MONITOR

SWITCH

TRANS-

FORMER

SECONDARY SWITCH

power of microwave oven as POWER LEVEL.

(refer to page 1-1)

WHEN THE DOOR IS OPENED DURING COOKING

• Both the primary switch and relay 2 are cut off primary winding voltage of the high voltage transformer.

• ON-OFF of relay 2 is coupled electrically with opening and closing of the secondary switch.

• When the door is opened, the secondary switch is opened and when the door is closed, the secondary switch is closed.

• The cooking time stops counting down.

• Relay stops functioning.

• As the door is opened, if the contact of primary switch and relay 2 and/or secondary switch fails to open, the fuse opens due to the large current surge caused by the monitor switch activation, which in turn stops magnetron oscillation.

FUSE

MICOM CONTROLLER

PRIMARY

SWITCH

RELAY 2

MONITOR

SWITCH

FORMER

SECONDARY SWITCH

• The fan motor rotates and cools the magnetron by blowing the air (coming from the intake on the backplate).

• The air is also directed into the oven to exhaust the vapor in the oven through the left side.

• Cooking time starts counting down.

• 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.

• 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 4000 Volts DC is applied to the filament of the magnetron.

WHEN THE OVEN IS SET AT ANY LEVEL EXCEPT MAXIMUM.

• The micom controller controls the ON-OFF time of relay 2 by the applied signal to vary the average output

4-4

CAUTIONS

• Be sure to check microwave leakage prior to servicing the oven if the oven is operative prior to servicing.

• The service personnel should inform the manufacture importer, or assembler of any certified oven unit found to have a microwave emission level in excess of 5 mW/cm

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.

• If the oven operates with the door open, the service personnel should:

- Tell the user not to operate the oven.

- Contact the manufacturer.

• 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/cm

. Always start measuring of an unknown field to assure safety for operating personnel from radiation leakage.

MEASURING MICROWAVE ENERGY LEAKAGE

• 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 2450 MHz and use it following the manufacturer's recommended test procedure to assure correct result.

• When measuring the leakage, always use the 2inch (5cm) spacer supplied with the probe.

• Operate the oven at its maximum output.

• Measure the microwave radiation using and electromagnetic radiation monitor by holding the probe perpendicular to the surface being measured

Move probe along shaded area

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

5-1

SERVICE INFORMATION

TOOLS AND MEASURING INSTRUMENTS

MICROWAVE LEAKAGE TEST

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(3

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)

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 below Fig.)

- Around the magnetron

- The waveguide

WARNING : AVOID CONTACTING ANY

HIGH VOLTAGE PARTS

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 possibly 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/cm2.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.

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/cm2.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/cm2.sq.

5-2

+ 28 hidden pages