Sharp R-395N - User Manual

CHAPTER 1. BEFORE SERVICING
CHAPTER 2. WARNING TO SERVICE PERSONNEL
CHAPTER 3. PRODUCT SPECIFICATIONS
CHAPTER 4. APPEARANCE VIEW
CHAPTER 5. OPERATION SEQUENCE
CHAPTER 6. FUNCTION OF IMPORTANT COMPO-
NENTS
CHAPTER 7. TROUBLESHOOTING GUIDE
CHAPTER 8. TEST PROCEDURES
CHAPTER 9. TOUCH CONTROL PANEL ASSEMBLY
CHAPTER 10. PRECAUTIONS FOR USING LEAD-
FREE SOLDER
CHAPTER 11. COMPONENT REPLACEMENT AND
ADJUSTMENT PROCEDURE
CHAPTER 12. MICROWAVE MEASUREMENT
CHAPTER 13. CIRCUIT DIAGRAMS
Parts List
S2901R395NPJS
SERVICE MANUAL
R395N(S)
CONTENTS
This document has been published to be used for
after sales service only.
The contents are subject to change without notice.
TopPage
MICROWAVE OVEN
R-395N(S)
MODEL
In the interests of user-safety the oven should be restored to its original condition and only parts identical to those
specified should be used.

Summary

Chapter 1. Before Servicing

General Important Information

General guidance and safety information for service personnel.

Caution Microwave Radiation

Safety precautions regarding exposure to microwave radiation during servicing.

Warning

Critical warnings and conditions to ensure before operating or servicing the oven.

Chapter 2. Warning to Service Personnel

Remember to Check 3 D

Procedural steps for safety checks before servicing internal components.

Warning: Against the Charge of the High-Voltage Capacitor

Specific warning and procedure for safely discharging the high-voltage capacitor.

Remember to Check 4 R

Procedural steps for reassembly and functional checks after servicing.

Chapter 3. Product Specifications

Chapter 4. Appearance View

Oven

Identification of external and internal parts of the microwave oven.

Touch Control Panel

Detailed layout and function of the microwave oven's touch control panel.

Chapter 5. Operation Sequence

Off Condition

Describes the initial state of the oven when powered on but not operating.

Microwave Cooking Condition

Explains the sequence and internal operations during high power cooking.

Power Output Reduction

Details the automatic power reduction feature after extended high-power operation.

Chapter 6. Function of Important Components

Door Open Mechanism

Explains the mechanical operation of the oven door opening system.

1 st. Latch Switch and 2 nd. Interlock Relay Control Switch

Describes the function and operation of door interlock safety switches.

Monitor Switch

Explains the role and operation of the monitor switch in the door safety circuit.

Fuse F10 A

Details the function and potential causes of blown F10A fuse.

Chapter 7. Troubleshooting Guide

Foreword

Introduction to the troubleshooting section and its methodology.

Chart

A troubleshooting chart correlating problems with possible causes and tests.

Chapter 8. Test Procedures

A: Magnetron (MG) Test

Procedure for testing the magnetron's continuity and output power.

B: Power Transformer Test

Procedure for testing the continuity of the power transformer windings.

C: High Voltage Rectifier Test

Procedure for testing the resistance of the high voltage rectifier assembly.

D: High Voltage Capacitor Test

Procedure for testing the high voltage capacitor's continuity and leakage.

E: Switch Test

Procedure for testing the continuity of various switches.

F: Temperature Fuse Test

Procedure for testing the oven's temperature fuse continuity.

G: Motor Winding Test

Procedure for testing the resistance of fan and turntable motors.

H: Fuse F10 A

Guidance on troubleshooting and replacing the F10A fuse.

I: Noise Filter Test

Procedure for testing the noise filter's continuity.

J: High Voltage Fuse Test

Guidance on troubleshooting and replacing the high voltage fuse.

K: Touch Control Panel Assembly Test

Procedure for testing the touch control panel and diagnosing unit failures.

L: Key Unit (Membrane Switch) Test

Procedure for testing the key unit and determining if the control unit or keypad is faulty.

M: Relay Test

Procedure for testing the operation and voltage of relays RY1 and RY2.

N: Procedures to be Taken When the Foil Pattern on the Printed Wiring Board (PWB) is Open

Troubleshooting steps for an open foil pattern on the printed wiring board.

Chapter 9. Touch Control Panel Assembly

Outline of Touch Control Panel

Overview of the touch control panel's constituent units and their functions.

Servicing for Touch Control Panel

Precautions and procedures for servicing the touch control panel unit.

Chapter 10. Precautions for Using Lead-Free Solder

Employing Lead-Free Solder

Information on identifying and using lead-free solder for repairs.

Using Lead-Free Wire Solder

Guidance on using lead-free wire solder and appropriate tools.

Soldering

Techniques and precautions for soldering with lead-free solder.

Chapter 11. Component Replacement and Adjustment Procedure

Before Operating

Safety warnings and checks required before performing any component replacement.

Outer Case Removal

Step-by-step instructions for safely removing the oven's outer casing.

Power Transformer Removal

Procedure for removing and reinstalling the power transformer.

High Voltage Rectifier Assembly, High Voltage Fuse and High Voltage Capacitor Removal

Instructions for removing HV rectifier, fuse, and capacitor.

Magnetron Removal

Detailed steps for safely removing the magnetron assembly.

Positive Lock Connector (No-Case Type) Removal

Procedure for disconnecting positive lock connectors.

Control Panel Assembly Removal

Steps for removing the control panel assembly from the oven.

Graphic Sheet and Membrane Switch Replacement

Procedure for replacing the graphic sheet and membrane switch.

Turntable Motor Removal

Instructions for removing the turntable motor.

Cooling Fan Motor Removal

Procedure for removing and reinstalling the cooling fan motor.

Power Supply Cord Replacement

Steps for replacing the power supply cord.

1 st. Latch Switch, 2 nd. Interlock Relay Control Switch and Monitor Switch Removal

Procedure for removing door interlock and monitor switches.

1 st. Latch Switch, 2 nd. Interlock Relay Control Switch and Monitor Switch Adjustment

Instructions for adjusting door interlock and monitor switches for proper operation.

Door Replacement

Detailed procedure for removing and replacing the oven door assembly.

Chapter 12. Microwave Measurement

Requirement

Specifies the safety standard for microwave radiation emission limits.

Preparation for Testing

Steps and materials needed for performing microwave leakage tests.

Chapter 13. Circuit Diagrams

Oven Schematic

Electrical schematic diagram showing the oven's circuitry in off and on conditions.

Pictorial Diagram (Figure S-1)

Pictorial representation of component connections within the oven.

Control Unit Circuit (Figure S-2)

Detailed circuit diagram for the control unit, including key and LSI units.

Printed Wiring Board (Figure S-3)

Diagram showing the layout of components on the power unit's printed wiring board.

Sharp R-395N Specifications