Panasonic NN-ST34HMLPK Service Manual
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Panasonic NN-ST34HMLPK Service Manual

25l silver philippin
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Power Requirement
Power Output
Microwave Frequency
Magnetron
Timer
Outside Dimensions
Cavity Dimensions
Net Weight
Shipping weight
Specifications subject to change without notice.
Model No.
25L
Silver
Philippin
NN-ST34HMLPK
220 Volts AC 60 Hz
(5.9 A)
Microwave 1270W
Single phase, 3 wire grounded
800 Watts full microwave power (IEC60705)
2,450 MHz
2M219J
0 ~ 99 min. 90 sec.
4
85
(W) x
287
(H) x
40
0(D) mm
315(W) x 227(H) x 349 (D) mm
12.7kg (approx.)
1
4.7
kg (approx.)
© Panasonic Corporation 2017 Unauthorized
copying and distribution is a violation of law
Order No. MOD1712484CE
Microwave Oven
NN-ST34HMLPK

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Summary of Contents for Panasonic NN-ST34HMLPK

  • Page 1 (H) x 0(D) mm Cavity Dimensions 315(W) x 227(H) x 349 (D) mm Net Weight 12.7kg (approx.) Shipping weight kg (approx.) Specifications subject to change without notice. © Panasonic Corporation 2017 Unauthorized copying and distribution is a violation of law...

  • Page 2: Safety Precautions

    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 shown below for your applicable product specifica on. LPK..For Philippin SAFETY PRECAUTIONS This device is to be serviced only by properly qualified service personnel.

  • Page 3: Table Of Contents

    CONTENTS (Page) SAFETY PRECAUTIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Inside front cover SPECIFICATIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1-1 CAUTIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2-1 INSTALLATIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3-1...
  • Page 4 POWER LEVEL & ACCESSORIES ITEM DESCRIPTION Control Complement Microwave Power for Variable Cooking Power level High 800 Watts 240 Watts Defrost 560 Watts Medium 520 Watts Warm 80 Watts Rating Label Location Inside Accessories Instruction manual Glass Tray Roller Ring This microwave oven is designed for household use only.

  • Page 5: Cautions

    CAUTIONS Unlike other appliances, the microwave oven is MICROWAVE RADIATION high-voltage and high-current equipment. Personnel should not be exposed to the Though it is free from danger in ordinary use, microwave energy which may radiate from the extreme care should be taken during repair. magnetron or other microwave generating device if it is improperly used or connection.

  • Page 6: Installations

    INSTALLATIONS BEFORE YOU BEGIN, READ THE FOLLOWING INSTRUCTIONS COMPLETELY AND CAREFULLY. INSTALLING EARTHING INSTRUCTIONS 1. Empty the microwave oven and clean inside it with This microwave oven is designed to be used in a fully a soft, damp cloth. Check for damage such as earthed condition.

  • Page 7: Operating Instructions

    OPERATING INSTRUCTIONS FEATURES Oven Front Plate See-Through oven window Door C Control Panel Safety Door Lock System Glass Tray Roller Ring CONTROL PANEL NN-ST34HM/W 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...

  • Page 8: Operating Sequence

    OPERATING SEQUENCE The following is a description of component functions 5. AUTO WEIGHT DEFROST during oven operation. Desired Stop/ Desired 1. SETTING THE CLOCK defrost Start weight Reset program Set the time 6. AUTO WEIGHT REHEAT Timer/ Stop/ Timer/ by pressing Clock Reset Clock...

  • Page 9: Schematic Diagram

    SCHEMATIC DIAGRAM...

  • Page 10: Circuit Description

    CIRCUIT DESCRIPTION power of microwave oven as POWER LEVEL. GENERAL DETAILS (refer to page 1-1) • The low voltage transformer supplies the necessary voltage to the micom controller when power cord is WHEN THE DOOR IS OPENED DURING plugged in. COOKING •...

  • Page 11: Service Information

    SERVICE INFORMATION TOOLS AND MEASURING INSTRUMENTS NECESSARY TOOLS NECESSARY MEASURING INSTRUMENTS Tools normally used for TV servicing are sufficient. • TESTER(VOLTS-DC, AC., Ohmmeter) Standard tools are listed below. • Microwave survey meter • Diagonal pliers - Holaday HI-1500 • Long nose pliers HI-1501 •...
  • Page 12 MEASUREMENT WITH OUTER CASE NOTES WHEN MEASURING REMOVED • Do not exceed meter full scale deflection. • The test probe must be removed no faster than • When you replace the magnetron, measure for 1 inch/sec (2.5 cm/sec) along the shaded area, microwave energy leakage before the outer case is otherwise a false reading may result.

  • Page 13: Measurement Of Microwave Power Output

    MEASUREMENT OF MICROWAVE POWER OUTPUT • Microwave power output measurement is made with is measured while the microwave generator is the microwave oven supplied at its rated voltage and operating at full power. Magnetron filament heat-up operated at its maximum microwave power setting with time is not included.
  • Page 14 D. DOOR ASSEMBLY REMOVAL E. HIGH VOLTAGE TRANSFORMER REMOVAL 1) Open the door. 2) Remove two screws holding the Hinge 1) Discharge the high voltage capacitor. to the Cavity Ass'y. 2) Disconnect the leadwire from magnetron, high voltage CAUTION : Be careful not to damage Door C transformer, and capacitor.
  • Page 15 H. AIR GUIDE ASSEMBLY REMOVAL J. REMOVING THE TURNTABLE MOTOR 1) Disconnect the leadwire from lamp, A.C Relay and 1) Remove the glass tray monitor resistor and magnetron. 2) Remove the pully shaft VERY CAREFULLY 3) Lay the unit down on its back. 2) Remove the screw to the cavity.
  • Page 16 K. PCB ASSEMBLY REMOVAL L. INTERLOCK SYSTEM 1) Remove the control panel assembly from the 1) INTERLOCK MECHANISM cavity. The door lock mechanism is a device which has been specially designed to eliminate completely 2) Remove screws which hold the PCB to microwave activity when the door is opened during control panel.

  • Page 17: Interlock Continuity Test

    INTERLOCK CONTINUITY TEST WARNING : FOR CONTINUED PROTECTION AGAINST EXCESSIVE RADIATION EMISSION, REPLACE ONLY WITH IDENTICAL REPLACEMENT PARTS. TYPE NO. KW3A FOR SWITCHS B. SECONDARY INTERLOCK SWITCH TEST A. PRIMARY INTERLOCK SWITCH TEST Disconnect the wire lead from the secondary When the door release button is depressed slowly switch.

  • Page 18: Component Test Procedure

    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.
  • Page 19 COMPONENTS TEST PROCEDURE RESULTS Antenna Gasket Chassis 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. HIGH VOLTAGE Measure the resistance. Normal: Momentarily indicates CAPACITOR (Ohm-meter scale: Rx1000) several ohms, and then...
  • Page 20 COMPONENTS TEST PROCEDURE RESULTS FUSE Check for continuity of the fuse with an Normal Abnormal multi-meter. NOTE: If the fuse is blown, check the 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.
  • Page 21 COMPONENTS TEST PROCEDURE RESULTS Ω FAN MOTOR Measure the resistance. Normal: 00~500 Abnormal: ∞ or several Ω (Wire leads removed) (Ohm-meter scale: R x 100) Ω Measure the resistance. TURNTABLE Normal: Approx. 100~200K Abnormal: ∞ or several Ω (Ohm-meter scale: R x 1000) MOTOR (Wire leads removed) NOTE : •...

  • Page 22: Trouble Shooting

    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.
  • Page 23 (TROUBLE 1) The following visual conditions indicate a probable defective control circuit. 1. Incomplete segments. • Segment missing. • Partial segment missing. • Digit flickering (NOTE: Slight flickering is normal.) 2. Colon does not turn on or blink. 3. A distinct change in the brightness of one or more numbers in display. 4.
  • Page 24 (TROUBLE 2) Oven does not operate at all ; Display window does not display any figures and no input is accepted. CONDITION CHECK RESULT CAUSE REMEDY Replace primary Malfunction of the Check continuity 1. Fuse blows. Continuity. and monitor monitor switch. of monitor switches.
  • Page 25 (TROUBLE 3) Display shows all figures set, but oven does not start cooking while desired program times are set and START pad is touched. CONDITION CHECK RESULT CAUSE REMEDY Defective Replace Check continuity 1.Setting time does No continuity. secondary switch. secondary switch.
  • Page 26 (TROUBLE 5) No microwave oscillation even though oven lamp and fan motor run (Display operates properly) CONDITION CHECK RESULT CAUSE REMEDY Defective P.C.B No microwave Disconnect the Replace P.C.B No continuity. assembly oscillation. wire leads from assembly relay 2 and check continuity Continuity.
  • Page 27 (TROUBLE 6) Oven does not cook properly when programmed for the set power level (Operates properly on HIGH) CONDITION CHECK RESULT CAUSE REMEDY Output is full when Defective P.C.B. Replace P.C.B. Disconnect the Abnormal. you set lower assembly. assembly. wire leads from power level.

  • Page 28: Exploded View

    EXPLODED VIEW INTRODUCTION OVEN CAVITY PARTS INTERIOR PARTS BASE PLATE PARTS DOOR PARTS CONTROL PANEL PARTS LATCH BOARD PARTS...
  • Page 29 DOOR PARTS D 03...
  • Page 30 CONTROL PANEL PARTS C 05...
  • Page 31 OVEN CAVITY PARTS...
  • Page 32 LATCH BOARD PARTS...
  • Page 33 INTERIOR PARTS...
  • Page 34 BASE PLATE PARTS...

  • Page 35: Replacement Parts List

    Do not use description of the part. 2. Important safety notice: Components identified by mark have special characteristics important for safety. When replacing any of these components, use only manufacture’s specified parts. For Model: NN-ST34HMLPK Safety Ref. No. Part No. Part Name & Description...

  • Page 36: Schematic Diagram Of P.c.b

    SCHEMATIC DIAGRAM OF P.C.B XTAL1/P2.4 SCAN3 P2.3 SCAN2 P2.2 SCAN1 P2.1 SCAN0 P2.0 COM1 P1.7 LAMP COM2 TDO/P1.6 MICRO COM3 TCK/P1.5 GRILL LED LAMP DOOR SEGA P0.0 SEGB P0.1...

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