Sharp R-990KS 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. COMPONENT REPLACEMENT AND
ADJUSTMENT PROCEDURE
CHAPTER 11. MICROWAVE MEASUREMENT
CHAPTER 12. CIRCUIT DIAGRAMS
Parts List
SX517R990KPJW
CONVECTION
MICROWAVE OVEN
R-990K(S)
R-990K(W)
SERVICE MANUAL
R990K(W)
MODELS
CONTENTS
SHARP CORPORATION
This document has been published to be used
for after sales service only.
The contents are subject to change without notice.
In the interest of user-safety the oven should be restored to its
original condition and only parts identical to those specified
should be used.

Sharp R-990KS Specifications

General

Brand	Sharp
Model	R-990KS
Category	Microwave Oven
Language	English

Summary

CHAPTER 1. BEFORE SERVICING

[2] CAUTION MICROWAVE RADIATION

Warns about the dangers of microwave radiation exposure during servicing.

[3] WARNING

Lists critical safety precautions and general warnings for oven operation.

CHAPTER 2. WARNING TO SERVICE PERSONNEL

WARNING: AGAINST THE CHARGE OF THE HIGH-VOLTAGE CAPACITOR

Specific, critical warning about residual charge in the high-voltage capacitor.

REMEMBER TO CHECK 4R

Details the steps for safely reassembling and testing the oven post-service.

CHAPTER 3. PRODUCT SPECIFICATIONS

CHAPTER 5. OPERATION SEQUENCE

[5] ABSOLUTEHUMIDITYSENSOR (AH SENSOR) COOKING CONDITION

CHAPTER 7. TROUBLESHOOTING GUIDE

[2] CHART

Provides a diagnostic chart mapping problems to possible causes and tests.

CHAPTER 8. TEST PROCEDURES

[1] Procedure A: MAGNETRON (MG) TEST

Details the method for testing the magnetron's continuity and output power.

[2] Procedure B: POWER TRANSFORMER TEST

Explains how to test the continuity of the power transformer's windings.

[3] Procedure C: HIGH VOLTAGE RECTIFIER TEST

Details the procedure for testing the high voltage rectifier assembly using an ohmmeter.

[4] Procedure D: HIGH VOLTAGE CAPACITOR TEST

Describes the method for testing the high voltage capacitor's continuity and insulation.

[5] Procedure E: SWITCH TEST

Explains how to test various switches using an ohmmeter and terminal connections.

[6] Procedure F: FUSE F10A

[7] Procedure G: TEMPERATURE FUSE AND TERMAL CUT-OUT TEST

Details testing temperature fuses and thermal cut-outs for continuity at specified temperatures.

[8] Procedure H: CONVECTION HEATER TEST

Explains how to test the convection heater's resistance and insulation.

[9] Procedure I: THERMISTOR TEST

[10] Procedure J: MOTOR WINDING TEST

[11] Procedure K: HIGH VOLTAGE FUSE TEST

[12] Procedure L: NOISE FILTER TEST

[13] Procedure M: TOUCH CONTROL PANEL ASSEMBLY TEST

Outlines troubleshooting symptoms for defective key or control units of the panel.

[14] Procedure N: KEY UNIT (MEMBRANE SWITCH) TEST

Details testing the key unit for responsiveness and proper signal output.

[15] Procedure O: RELAY TEST

[16] Procedure P: PROCEDURES TO BE TAKEN WHEN THE FOIL PATTERN ON THE PRINTED WIRING BOARD (PWB) IS OPEN

[17] Procedure Q: AH SENSOR TEST

Details the testing procedure for the Absolute Humidity sensor and control unit.

CHAPTER 10. COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE

[1] BEFORE OPERATING

Lists critical safety precautions and checks before performing any service work.

WARNING FOR WIRING

Provides essential wiring precautions to prevent electric shock and damage.

REMEMBER TO CHECK 3D

Reinforces the mandatory safety checks (3D checks) before servicing.

[3] POWER TRANSFORMER REMOVAL

Guides on safely removing and reinstalling the power transformer.

[4] MAGNETRON REMOVAL

Explains the procedure for removing the magnetron, including precautions.

[5] HIGH VOLTAGE RECTIFIER ASSEMBLY REMOVAL

Details the removal of the high voltage rectifier assembly, emphasizing earthing.

[6] HIGH VOLTAGE CAPACITOR REMOVAL

Guides on safely removing the high voltage capacitor, including discharging.

[8] HEATER UNIT ASSEMBLY REMOVAL (HEATING ELEMENT/THERMISTOR)

[9] CONTROL PANEL ASSEMBLY AND CONTROL UNIT REMOVAL

[16] STOP SWITCH, UPPER LATCH SWITCH, LOWER LATCH SWITCH AND MONITOR SWITCH REMOVAL

[17] STOP SWITCH, UPPER LATCH SWITCH, LOWER LATCH SWITCH AND MONITOR SWITCH ADJUSTMENT

[18] DOOR REPLACEMENT AND ADJUSTMENT

CHAPTER 11. MICROWAVE MEASUREMENT

REQUIREMENT

Specifies the safety requirement for microwave radiation emission limits.

PREPARATION FOR TESTING

CHAPTER 12. CIRCUIT DIAGRAMS

[1] Oven Schematic

Presents the main schematic diagram illustrating the oven's electrical circuits.