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R-959(SL)M-AA

CONTENTS

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S3306R959PKAA

In the interests of user-safety the oven should be restored to its original condition and only parts identical to those spec-

ified should be used.

CONTENTS

CHAPTER 1. BEFORE SERVICING
[1]  GENERAL IMPORTANT INFORMA-

TION ........................................................... 1-1

[2] WARNING 

MICROWAVE 

RADIATION ....... 1-1

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

CHAPTER 5. OPERATION SEQUENCE
[1] OFF 

CONDITION........................................ 5-1

[2]  MICROWAVE COOKING CONDITION....... 5-1
[3]  GRILL COOKING CONDITION .................. 5-2
[4] CONVECTION 

COOKING 

CONDITION..... 5-2

[5]  COMBI COOKING CONDITION ................. 5-2
[6] ON/OFF 

TIME 

RATIO ................................. 5-2

[7] AUTOMATIC 

COOKING ............................. 5-2

[8]  POWER OUTPUT REDUCTION ................ 5-3
[9] FAN 

MOTOR 

OPERATION......................... 5-3

[10] CONVECTION MOTOR OPERATION........ 5-3

CHAPTER 6. FUNCTION OF IMPORTANT COM-
PONENTS
[1]  DOOR OPEN MECHANISM ....................... 6-1
[2] SWITCH...................................................... 6-1
[3] FUSE .......................................................... 6-1
[4] TC 

TRANSFORMER .................................. 6-1

[5] THERMAL 

CUT-OUT.................................. 6-1

[6] ASYMMETRIC 

RECTIFIER ........................ 6-1

[7] NOISE 

FILTER............................................ 6-2

[8] MOTOR....................................................... 6-2
[9] HEATING 

ELEMENT .................................. 6-2

[10] CONVECTION COOKING SYSTEM .......... 6-2
[11]  FIRE SENSING FEATURE ......................... 6-2
[12]  OPEN JUDGE BY THERMISTOR .............. 6-2
[13]  DAMPER OPEN-CLOSE MECHANISM..... 6-3

CHAPTER 8. TEST PROCEDURES
[1]  A: MAGNETRON TEST .............................. 8-1
[2]  B: HIGH VOLTAGE TRANSFORMER 

TEST........................................................... 8-1

[3]  C: HIGH VOLTAGE RECTIFIER TEST....... 8-2
[4]  D: HIGH VOLTAGE CAPACITOR TEST..... 8-2
[5] E: 

SWITCH 

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

[6]  F: THERMISTOR TEST .............................. 8-2
[7]  G: THERMAL CUT-OUT TEST................... 8-3
[8]  H: MOTOR WINDING TEST ....................... 8-3
[9]  I: NOISE FILTER TEST .............................. 8-3
[10]  J: BLOWN FUSE 20A ................................. 8-3

[11]  K: BLOWN FUSE F8A (NOISE FILTER)..... 8-3
[12]  L: GRILL HEATING ELEMENTS (TOP) 

AND CONVECTION HEATING ELE-
MENT TEST................................................ 8-4

[13]  M: CONTROL PANEL ASSEMBLY 

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

[14]  N: KEY UNIT TEST..................................... 8-5
[15]  O: RELAY TEST ......................................... 8-5
[16]  P: PROCEDURES TO BE TAKEN 

WHEN THE FOIL PATTERN ON THE 
PRINTED WIRING BOARD (PWB) IS 
OPEN.......................................................... 8-5

CHAPTER 9. TOUCH CONTROL PANEL ASSEM-
BLY
[1]  OUTLINE OF TOUCH CONTROL PAN-

EL ............................................................... 9-1

[2]  SERVICING FOR TOUCH CONTROL 

PANEL ........................................................ 9-2

CHAPTER 11. COMPONENT REPLACEMENT 
AND ADJUSTMENT PROCEDURE
[1] BEFORE 

OPERATING ..............................11-1

[2]  OUTER CASE REMOVAL .........................11-1
[3]  HIGH VOLTAGE COMPONENTS RE-

MOVAL.......................................................11-1

[4]  HIGH VOLTAGE TRANSFORMER RE-

MOVAL.......................................................11-2

[5] MAGNETRON 

REMOVAL .........................11-2

[6]  CONTROL PANEL ASSEMBLY RE-

MOVAL.......................................................11-2

[7]  GRAPHIC SHEET AND MEMBRANE 

SWITCH REPLACEMENT.........................11-2

[8] FAN 

MOTOR 

REREPLACEMENT.............11-3

[9] TURNTABLE 

MOTOR 

REPLACEMENT....11-3

[10]  CONVECTION MOTOR AND CONVEC-

TION HEATING ELEMENT REMOVAL .....11-4

[11]  POSITIVE LOCK CONNECTOR RE-

MOVAL.......................................................11-4

[12]  OVEN LAMP SOCKET REMOVAL ............11-5
[13]  POWER SUPPLY CORD REPLACE-

MENT.........................................................11-5

[14]  GRILL HEATING ELEMENTS REMOV-

AL...............................................................11-5

[15]  MONITORED LATCH SWITCH, MONI-

TOR SWITCH AND STOP SWITCH RE-
MOVAL.......................................................11-5

[16]  MONITORED LATCH SWITCH, STOP 

SWITCH AND MONITOR SWITCH AD-
JUSTMENT................................................11-6

[17] DOOR REPLACEMENT ............................11-6

CHAPTER 13. CIRCUIT DIAGRAMS
[1] Oven 

Schematic ....................................... 13-1

[2] Pictorial 

Diagram ...................................... 13-5

[3] Control 

Unit 

Circuit.................................... 13-6

[4]  Printed Wiring Board ................................ 13-7

R-959(SL)M-AA

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R959(SL)MA

This Manual has been prepared to provide Sharp Corp. Service engineers with Operation and Service Information.

It is recommended that service engineers carefully study the entire text of this manual, so they will be qualified to render satisfactory customer ser-
vice.   

Personnel should not be exposed to the microwave energy which may radiate from the magnetron or other microwave
generating devices if it is improperly used or connected. All input and output microwave connections, waveguides,
flanges and gaskets must be secured. Never operate the device without a microwave energy absorbing load attached.
Never look into an open waveguide or antenna while the device is energized.

Never operate the oven until the following points are ensured.
(A) The door is tightly closed.
(B) The door brackets and hinges are not defective.
(C) The door packing is not damaged.
(D) The door is not deformed or warped.
(E) There is not any other visible damage with the oven.
Servicing and repair work must be carried out only by trained service engineers.

All the parts marked "

" on parts list are used at voltages more than 250V.

Removal of the outer wrap gives access to potentials above 250V.
All the parts marked "*" on parts list may cause undue microwave exposure, by themselves, or when they are damaged,
loosened or removed.
Never operate the Grill and/ or Convection heater with the oven outer cabinet removed. (Because air flow is elim-
inated, and the excess heat generated on adjacent components). It can cause permanent damage or a fire.

THE WIRES IN THIS MAINS LEAD ARE COLOURED IN ACCORDANCE WITH THE FOLLOWING CODE:

 GREEN-AND-YELLOW--------------EARTH

 BLUE---------------------------------NEUTRAL
 BROWN-------------------------------------LIVE