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CONTENTS

CHAPTER 1. BEFORE SERVICING

[1] GENERAL IMPORTANT INFORMATION.....1-1

[2] CAUTION MICROWAVE RADIATION ........1-1

[3] WARNING ..................................................1-1

CHAPTER 2. WARNING TO SERVICE PERSONNEL

CHAPTER 3. PRODUCT SPECIFICATIONS

CHAPTER 4. APPEARANCE VIEW

[1] OVEN .........................................................4-1

[2] TOUCH CONTROL PANEL........................4-1

CHAPTER 5. OPERATION SEQUENCE

[1] OFF CONDITION .......................................5-1

[2] MICROWAVE COOKING CONDITION ......5-1

[3] CONVECTION COOKING CONDITION.....5-1

[4] AUTOMATIC MIX COOKING CONDITION.....5-2

[5] ABSOLUTEHUMIDITYSENSOR (AH

SENSOR)COOKING CONDITION .............5-2

[6] AH SENSOR COOKING SEQUENCE .......5-3

[7] MULTI COOK .............................................5-3

[8] EASY DEFROST COOKING......................5-3

[9] FIRE SENSING FEATURE (MICROWAVE

MODE)........................................................5-3

CHAPTER 6. FUNCTION OF IMPORTANT COMPO-

NENTS

[1] DOOR OPEN MECHANISM.......................6-1

[2] UPPER LATCH SWITCH, LOWER LATCH

SWITCHAND STOP SWITCH ....................6-1

[3] MONITOR SWITCH ...................................6-1

[4] THERMAL CUT-OUT 150C (CONV.) .........6-1

[5] THERMAL CUT-OUT 95C (FAN MOTOR).....6-1

[6] TEMPERATURE FUSE 150C (MG) ...........6-1

[7] FUSE F10A 250V .......................................6-1

[8] THERMISTOR............................................6-1

[9] TURNTABLE MOTOR ................................6-1

[10] CONVECTION MOTOR .............................6-1

[11] FAN MOTOR ..............................................6-1

[12] CONVECTION HEATER ............................6-1

[13] CONVECTION COOKING SYSTEM..........6-2

[14] DAMPER OPEN-CLOSE MECHANISM.....6-2

[15] HIGH VOLTAGE FUSE ..............................6-2

CHAPTER 7. TROUBLESHOOTING GUIDE

[1] FOREWORD ..............................................7-1

[2] CHART .......................................................7-1

CHAPTER 8. TEST PROCEDURES

[1] Procedure A: MAGNETRON (MG) TEST.....8-1

[2] Procedure B: POWER TRANSFORMER

TEST ..........................................................8-2

[3] Procedure C: HIGH VOLTAGE RECTIFI-

ER TEST ....................................................8-2

[4] Procedure D: HIGH VOLTAGE CAPACI-

TOR TEST..................................................8-2

[5] Procedure E: SWITCH TEST .....................8-3

[6] Procedure F: FUSE F10A...........................8-3

[7] Procedure G: TEMPERATURE FUSE

AND TERMAL CUT-OUT TEST ................. 8-3

[8] Procedure H: CONVECTION HEATER

TEST........................................................... 8-3

[9] Procedure I: THERMISTOR TEST ............. 8-3

[10] Procedure J: MOTOR WINDING TEST...... 8-4

[11] Procedure K: HIGH VOLTAGE FUSE

TEST........................................................... 8-4

[12] Procedure L: NOISE FILTER TEST.......

..... 8-4

[13] Procedure M: TOUCH CONTROL PANEL

ASSEMBLY TEST....................................... 8-4

[14] Procedure N: KEY UNIT (MEMBRANE

SWITCH) TEST .......................................... 8-5

[15] Procedure O: RELAY TEST........................ 8-5

[16] Procedure P: PROCEDURES TO BE TAK-

EN WHEN THE FOIL PATTERN ON THE

PRINTED WIRING BOARD (PWB) IS

OPEN.......................................................... 8-5

[17] Procedure Q: AH SENSOR TEST .............. 8-6

CHAPTER 9. TOUCH CONTROL PANEL ASSEM-

BLY

[1] OUTLINE OF TOUCH CONTROL PANEL ..... 9-1

[2] DESCRIPTION OF LSI ............................... 9-1

[3] ABSOLUTE HUMIDITY SENSOR CIR-

CUIT ........................................................... 9-4

[4] SERVICING FOR TOUCH CONTROL

PANEL ........................................................ 9-5

[5] PRECAUTIONS FOR USING LEAD-

FREE SOLDER .......................................... 9-6

CHAPTER 10. COMPONENT REPLACEMENT AND

ADJUSTMENT PROCEDURE

[1] BEFORE OPERATING ............................. 10-1

[2] OUTER CASE REMOVAL ........................ 10-1

[3] POWER TRANSFORMER REMOVAL ..... 10-2

[4] MAGNETRON REMOVAL ........................ 10-2

[5] HIGH VOLTAGE RECTIFIER ASSEMBLY

REMOVAL ................................................ 10-2

[6] HIGH VOLTAGE CAPACITOR REMOVAL... 10-2

[7] OVEN LAMP SOCKET REMOVAL........... 10-2

[8] HEATER UNIT ASSEMBLY REMOVAL

(HEATING ELEMENT/THERMISTOR) ..... 10-2

[9] CONTROL PANEL ASSEMBLY AND

CONTROL UNIT REMOVAL..................... 10-3

[10] TURNTABLE MOTOR AND/OR COU-

PLING REMOVAL..................................... 10-3

[11] CONVECTION MOTOR REMOVAL ......... 10-3

[12] DAMPER ASSEMBLY REMOVAL ............ 10-3

[13] FAN MOTOR REPLACEMENT................. 10-3

[14] CORD HOLDER REMOVAL..................... 10-4

[15] POWER SUPPLY CORD REPLACE-

MENT........................................................ 10-4

[16] STOP SWITCH, UPPER LATCH SWITCH,

LOWER LATCH SWITCH AND MONITOR

SWITCH REMOVAL ................................. 10-5

[17] STOP SWITCH, UPPER LATCH SWITCH,

LOWER LATCH SWITCH AND MONITOR

SWITCH ADJUSTMENT .......................... 10-5

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

Sharp R-990KS User Manual

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