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Panasonic NN-ST34HMLPK, Service Manual

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Panasonic NN-ST34HMLPK Service Manual Download Page 25

5-15

(TROUBLE 3) Display shows all figures set, but oven does not start cooking while

desired program times are set and START pad is touched.

(TROUBLE 4) Oven seems to be operation but output power is low. 

CONDITION

CHECK

RESULT

CAUSE

REMEDY

1.Setting time does

not count down
when touching
START pad.

2. Fan motor or

oven lamp
do not turn
on.

No continuity.

continuity.

No continuity.

Continuity.

Check the con-
nection between
connector and
P.C.B assembly.

Defective
secondary switch.

Replace
secondary switch.

Defective P.C.B
assembly.

Replace P.C.B
assembly.

Check continuity
of secondary
switch (with
door closed).

Check fan motor.

Check oven lamp.

Abnormal.

Abnormal.

Normal.

Defective fan
motor.

Defective oven
lamp.

Replace fan
motor.

Replace oven
lamp.

Loose connection.

Connection then
tightly.

CONDITION

CHECK

RESULT

CAUSE

REMEDY

Output is low.

Lower than 90% of
rating voltage.

Normal.

Normal.

Abnormal.

Abnormal.

Measure the
output power.

Disconnect the
wire leads from
relay 2 and check
on and off time
with multitester.

Defective P.C.B
assembly.

Replace  P.C.B
assembly.

Decrease in power
source voltage
with load.

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

Check the
power source
voltage.

Defective
magnetron.

Replace
magnetron.

NOTE: Refer to Page 5-3 for measuring of microwave power output.

Summary of Contents for NN-ST34HMLPK

Page 1: ... 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 x349 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 ...

Page 2: ...r 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 ...

Page 3: ... 2 SCHEMATIC DIAGRAM 4 3 CIRCUIT DESCRIPTION 4 4 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 12 EXPLODED VIEW 6 1 REPLACEMENT PARTS LIST 7 1 SCHEMATIC DIAGRAM OF P C B 8 1 CONTENTS ...

Page 4: ...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 ...

Page 5: ...tron 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 du...

Page 6: ...lat 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 wire...

Page 7: ...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 wil...

Page 8: ...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 Reset 12 Reset Reset This feature will make the oven controls inoperable however the door can be opened C...

Page 9: ...SCHEMATIC DIAGRAM 4 3 ...

Page 10: ...oltage 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 windi...

Page 11: ...hich 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 2 inch 5cm spacer supplied with the probe Operate the oven at its maximum output Measure the microwave radiation using and electromagnetic radi...

Page 12: ...e 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 t...

Page 13: ...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 thd 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 K is measured where T is the time in seconds and T is the temperature rise The initial and final water temperatures are se...

Page 14: ...gh 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 Remove door Assembly Remove door Assembly to the Cavity Ass y 2 Remove two screws holding the Hinge F 1 Discharge the high voltage capacitor 2 Disconnect the leadwire from fan motor noise filter and high voltage capacitor 3 Re...

Page 15: ...t the leadwire from the turntable motor terminals 6 Remove the screw securing the turntable motor to the oven cavity ASS Y 7 After rep 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 Waveguide Magnetron Gasket Magnetron Dome Waveguide Bracket Magnetron 2 W...

Page 16: ... 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 lat...

Page 17: ...n 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 Th...

Page 18: ...EDURE RESULTS HIGH VOLTAGE TRANSFORMER Wire leads removed MAGNETRON Wire leads removed 1 Measure the resistance Ohm meter scale Rx1 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 Filam...

Page 19: ...x10000 Measure the continuity Reverse Ohm meter scale Rx10000 Normal Momentarily indicates several ohms and then gradually returns to Normal Normal Abnormal Continuity 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 Antenna Gasket Chassis Filament 10M ohms NOTE Some inexpensive meters may indicate infi...

Page 20: ...e primary the secondary and the monitor switches H V D and H V C before replacing the fuse If the fuse is blown by improper switch operation replace the defective switch and the fuse at the same time Replace just the fuse if the switches operate normally Check for P C B connector Normal Abnormal Cooking Start OFF Below specified temperature specified temperature Above L V Transformer of P C B Disc...

Page 21: ...e resistance Ohm meter scale R x 1000 Normal Abnormal or several Ω Normal Approx 100 200K Abnormal or several Ω 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 00 500 1 Ω Ω ...

Page 22: ... does not work Inserting many plug into one plug outlet and using them at the same time causes overloading Microwave oven plug is not inserted tightly Output power is too low Low AC input voltage Food temperature is too low Using metallic ware and allowing it to touch the oven wall Sparks occurring Inconsistent intensity of microwave by their characteristics 1 Wrap the thinner part with aluminum f...

Page 23: ...ing cooking cycle 11 Display time of day does not reappear when cooking is finished 12 Beep sound is not heard when correct key is touched 5 13 TROUBLE 1 The following visual conditions indicate a probable defective control circuit CONDITION CHECK RESULT CAUSE REMEDY 1 No input can be programmed Continuity No continuity Everything works as specified Still have trouble Defective PCB assembly Replac...

Page 24: ...ch with door closed Check continuity of primary switch with door opened Disconnect one side of the wire lead connected from transformer to the high voltage capacitor and operate the unit Replace fuse TROUBLE 2 Oven does not operate at all Display window does not display any figures and no input is accepted NOTE All these switches must be replaced at the same time Refer to page 5 6 5 7 2 Fuse does ...

Page 25: ...k continuity of secondary switch with door closed Check fan motor Check oven lamp Abnormal Abnormal Normal Defective fan motor Defective oven lamp Replace fan motor Replace oven lamp Loose connection Connection then tightly CONDITION CHECK RESULT CAUSE REMEDY Output is low Lower than 90 of rating voltage Normal Normal Abnormal Abnormal Measure the output power Disconnect the wire leads from relay ...

Page 26: ... Replace high voltage transformer Check H V transformer normal normal Abnormal Defective high voltage Diode Replace high voltage Diode Check H V diode Abnormal Defective high voltage capacitor Replace high voltage capacitor Check H V capacitor Abnormal Defective magnetron Replace magnetron Check Magnetron TROUBLE 5 No microwave oscillation even though oven lamp and fan motor run Display operates p...

Page 27: ...e set power level Operates properly on HIGH CONDITION CHECK RESULT CAUSE REMEDY Output is full when you set lower power level Abnormal Disconnect the wire leads from relay 2 and check continuity relay 2 Operate the unit Defective P C B assembly Replace P C B assembly ...

Page 28: ...6 1 EXPLODED VIEW INTRODUCTION OVEN CAVITY PARTS INTERIOR PARTS BASE PLATE PARTS LATCH BOARD PARTS CONTROL PANEL PARTS DOOR PARTS ...

Page 29: ...6 2 DOOR PARTS D03 ...

Page 30: ...6 3 CONTROL PANEL PARTS C 05 ...

Page 31: ...6 4 OVEN CAVITY PARTS ...

Page 32: ...6 5 LATCH BOARD PARTS ...

Page 33: ...INTERIOR PARTS 6 6 ...

Page 34: ...6 7 BASE PLATE PARTS Z22 ...

Page 35: ...ver 1 ScreenB Black D08 A308541V0ZP DOOR C 1 E01 2M219J MAGNETRON 1 E05 A600B41T0LP H V TRANSFORMER 1 E06 A609041T0WT H V CAPACITOR 1 E07 A620241V0ZP DIODE SI 1 E11 A623040N0BP FUSE 1 E12 A623141V0TU FUSE HOLDER 1 E13 A612E7W50BP LAMP UNIT 1 E16 A900C41T0LP AC CORD W PLUG 1 E44 A614541T0ZP THERMAL CUTOUT OVEN 1 120 C 0 C L01 A302041V0ZP DOOR HOOK A 1 L02 A313641V0ZP HOOK SPACER 1 L03 A614141V0ZP M...

Page 36: ...UT Oscillation XIN XOUT COM2 COM3 R9 1K R10 1K R11 1K R12 1K R13 1K R14 1K L E101 4 7uF 400V C103 103 1 3 5 CN100 VH5 3 Power Circuit E102 470uF 25V R106 10K E100 4 7uF 400V L101 2 2mH 0 1A C101 102 1KV R105 330R D102 1N4007 D100 1N4007 E103 470uF 25V D103 1N4007 RX 22R 2W R111 100K R102 100K 1 2 3 4 IC102 PC817 D101 1N4007 12V 5V 250mA 1 2 3 4 IC101 PC817 S 1 BP 3 FB 4 D 5 S 7 S 8 S 2 IC100 LNK36...

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