Panasonic NN-ST34HMLPK Bedienungsanleitung

Microwave Oven

Model No.

copying and distribution is a violation of law

Silver

25L

Power Requirement

Power Output

Microwave Frequency

Magnetron

Timer

Outside Dimensions

Cavity Dimensions

Net Weight

Shipping weight

Speciﬁcations subject to change without notice.

Single phase, 3 wire grounded

2,450 MHz

0 ~ 99 min. 90 sec.

4 (W) x (H) x 0(D) mm

12.7kg (approx.)

2M219J

1 kg (approx.)

800 Watts full microwave power (IEC60705)

315(W) x227(H) x 349 (D) mm

85 287 40

4.7

NN-ST34HMLPK

220 Volts AC 60 Hz

Philippin

Microwave 1270W

(5.9 A)

Order No. MOD1712484CE

NN-ST34HMLPK

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.

SAFETY PRECAUTIONS

CAUTION

MICROWAVE RADIATION

DO NOT BECOME EXPOSED TO RADIATION FROM THE MICROWAVE GENERATOR

OR OTHER PARTS CONDUCTING MICROWAVE ENERGY.

WARNING

This product should be serviced only by trained qualiﬁed personnel.

This service manual covers products for following markets.

When troubles or replacing parts, please refer to the country iden ca shown below for your

applicable product speciﬁca on.

LPK.......For Philippin

(Page)

SAFETY PRECAUTIONS

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Inside front cover

SPECIFICATIONS

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1-1

CAUTIONS

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2-1

INSTALLATIONS

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3-1

OPERATING INSTRUCTIONS

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4-1

FEATURES

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4-1

CONTROL PANEL

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4-1

OPERATING SEQUENCE

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4-2

SCHEMATIC DIAGRAM

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4-3

CIRCUIT DESCRIPTION

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4-4

SERVICE INFORMATION

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5-1

TOOLS AND MEASURING INSTRUMENTS

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5-1

MICROWAVE LEAKAGE TEST

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5-1

MEASUREMENT OF MICROWAVE POWER OUTPUT

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5-3

DISASSEMBLY AND ADJUSTMENT

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5-3

INTERLOCK CONTINUITY TEST

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5-7

COMPONENT TEST PROCEDURE

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5-8

TROUBLE SHOOTING

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5-12

EXPLODED VIEW

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6-1

REPLACEMENT PARTS LIST

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7-1

SCHEMATIC DIAGRAM OF P.C.B.

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8-1

CONTENTS

1-1

POWER LEVEL & ACCESSORIES

This microwave oven is designed for household use only.

It is not recommended for commercial purposes.

DESCRIPTION

Microwave Power for Variable Cooking

Power level

ITEM

Control Complement

Rating Label Location

Accessories

Glass Tray

Roller Ring

Instruction manual

Inside

240 Watts

High

Defrost

Medium

Low

Warm

800 Watts

520 Watts

560 Watts

80 Watts

• 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

3-1

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

WARNING-

THIS APPLIANCE

MUST BE EARTHED

IMPORTANT

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 Eor by the earth symbol ( ) or

colored green or green-and-yellow.

The wire which is colored blue must be connected to

the terminal in the plug which is marked with the letter

Nor colored black.

The wire which is colored brown must be connected

to the terminal in the plug which is marked with the

letter Lor colored red.

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

10cm

The wires in this mains lead are colored in

accordance with the following code:

Green-and-yellow: Earth

Blue: Neutral

Brown: Live

4-1

OPERATING INSTRUCTIONS

FEATURES

CONTROL PANEL

Oven Front Plate

Safety Door Lock System

Control Panel

Roller Ring

Glass Tray

See-Through oven window

Door C

1 Display window

2 Micro Power pad

3 Turbo Defrost pad

4 Auto Reheat pad

5 Time pads

6 Auto Menu pad

7 Timer / Clock pad

8 Up / Down pads for weight

setting

9 Add Time pad

10 Quick 30 pad

11 Stop / Reset pad

Before Cooking

One press clears your instructions.

During Cooking

One press temporarily stops the

cooking process. Another press

cancels all your instructions and a

colon or the time of day will appear

in the display.

12 Start pad

One press allows oven to begin

operation. If door is opened or

Stop/Reset is pressed once during

oven operation, Start must be

pressed again to restart oven.

NN-ST34HM/W

When a pad is pressed correctly a

beep will be heard. If a pad is pressed

and no beep is heard, the unit has not

or cannot accept the instruction. The

oven will beep twice between

programmed stages. At the end of any

complete programme, the oven will

beep 5 times.

Beep sound

OPERATING SEQUENCE

The following is a description of component functions

during oven operation.

1. SETTING THE CLOCK

NOTE: You can set hour clock.

2. CANCEL FUNCTION

Touch the Stop/Reset 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.

COOKING

4-2

Stop/ Set the time

by pressing

Stop/ Desired

defrost Desired

Start

Stop/ Desired

cooking time

Desired

cooking power Start

2 STAGE

3. MICROWAVE COOKING

4. MULTI-STAGE MICROWAVE

5. AUTO WEIGHT DEFROST

time pads

program weight

Stop/ Desired Desired

Start

program weight

reheat

6. AUTO WEIGHT REHEAT

7. CHILD LOCK

COOKING

Stop/ Desired

cooking time

Desired

cooking power

Desired

cooking time

Desired

cooking power Start

Reset Clock

Timer/ Clock

Timer/

Reset

This feature will make the oven controls inoperable;

however, the door can be opened.

Child Lock can be set when the display shows a colon

or the time.

Press Encender 3 times in

10 seconds.

The clock will disappear. Actual time

will not be lost. “Child” is indicated in

the display.

To Set:

To Cancel:

Press Pausa/Cancelar 3 times in

10 seconds.

The clock will reappear in the display.

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.

• 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

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.

4-4

FUSE

TRANS-

FORMER

RELAY 2

MICOM CONTROLLER

SECONDARY

SWITCH

MONITOR

SWITCH

PRIMARY

MONITOR

SWITCH

FUSE

FORMER

RELAY 2

MICOM CONTROLLER

SECONDARY

SWITCH

PRIMARY

SWITCH

• The fan motor rotates and cools the magnetron by

blowing the air (coming from the intake on the

• The air is also directed into the oven to exhaust the

vapor in the oven through the left side.

backplate).

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