Sharp Carousel R-350C Service Manual
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Sharp Carousel R-350C Service Manual

Sharp Carousel R-350C Service Manual

Microwave oven
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CAUTION, MICROWAVE RADIATION ............................................................................................................. 1
WARNING .......................................................................................................................................................... 1
PRODUCT SPECIFICATIONS ......................................................................................................................... 2
GENERAL INFORMATION ................................................................................................................................ 2
APPEARANCE VIEW ....................................................................................................................................... 3
OPERATION SEQUENCE ................................................................................................................................ 4
FUNCTION OF IMPORTANT COMPONENTS ................................................................................................ 5
SERVICING ...................................................................................................................................................... 6
TEST PROCEDURE ......................................................................................................................................... 8
TOUCH CONTROL PANEL ............................................................................................................................. 14
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ........................................................... 18
MICROWAVE MEASUREMENT .................................................................................................................... 24
WIRING DIAGRAM ......................................................................................................................................... 25
PICTORIAL DIAGRAM ................................................................................................................................... 26
POWER UNIT CIRCUIT .................................................................................................................................. 27
CPU UNIT CIRCUIT ........................................................................................................................................ 28
PRINTED WIRING BOARD ............................................................................................................................. 29
PARTS LIST ................................................................................................................................................... 30
SERVICE MANUAL
DEFRO ST
COOK
HELP
MODEL
HE LP
Pas ta Me
al
Fro zen Din
ner
DIN NE R
PLA TE
CAS SER OLE
SO UP
PIZ ZA
VEV ERA GE
PIE
VE GE TAB
LES
RIC E/P AS
TA
ME AT
EAS Y DEF
RO ST
LES S
MO RE
1
2 3
4
5
6
7 8
9 O
PO WE R
LEV EL
CLO CK
TIM ER
STO P
CLE AR
INS TAN T
COO K
STA RT
In interests of user-safety the oven should be restored to its
original condition and only parts identical to those specified
should be used.

TABLE OF CONTENTS

SHARP CORPORATION
MICROWAVE OVEN
R-350C
R-350C
S6904R350CPJ/
Page

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Summary of Contents for Sharp Carousel R-350C

  • Page 1: Table Of Contents

    R-350C SERVICE MANUAL S6904R350CPJ/ MICROWAVE OVEN R-350C DEFRO ST COOK HELP MODEL HE LP Pas ta Me Fro zen Din DIN NE R PLA TE CAS SER OLE SO UP PIZ ZA VEV ERA GE VE GE TAB RIC E/P AS...
  • Page 2 R-350C...

  • Page 3: Caution Microwave Radiation

    MICROWAVE OVEN APPEARANCE VIEW R-350C GENERAL IMPORTANT INFORMATION This Manual has been prepared to provide Sharp Corp. Service OPERATING SEQUENCE 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 FUNCTION OF IMPORTANT satisfactory customer service.

  • Page 4: Product Specifications

    R-350C PRODUCT SPECIFICATIONS ITEM DESCRIPTION Power Requirements 230 - 240 Volts 50 Hertz Single phase, 3 wire earthed Power Consumption 1.5kW Power Output 1000 watts nominal of RF microwave energy (IEC 705) Operating frequency 2450 MHz Case Dimensions Width 520 mm...

  • Page 5: Appearance View

    R-350C APPEARANCE VIEW 1. Ventilation openings 2. Oven lamp 9. Touch control panel 3. Door hinges 10.Digital readout 4. Door safety latches 11.Wave guide cover 5. See through door 12.Power supply cord 6. Door seals and sealing surfaces 13.Rating label 7.

  • Page 6: Operation Sequence

    Figure O-1 on page 25 first. 1. The display shows "SHARP MICRO-WAVE OVEN". After that the contacts (COM-NC) of the monitor 2. To set any programmes or set the clock, you must switch can be closed.

  • Page 7: Function Of Important Components

    R-350C FUNCTION OF IMPORTANT COMPONENTS 2. If the wire harness or electrical components are short- DOOR OPEN MECHANISM circuited, this fuse M10A blows to prevent an electric The door is opened by pushing the open button on the shock or fire hazard.

  • Page 8: Servicing

    If the water remains cold carry out 3D checks and re- examine the connections to the component being Sharp recommend that wherever possible fault-finding tested. is carried out with the supply disconnected. It may in, some cases, be necessary to connect the supply after...
  • Page 9 R-350C CK = Check / RE = Replace TEST PROCEDURE A B C D E E E E G F H H I L M N O RECK CK RE CK CK CK CK CK POSSIBLE CAUSE DEFECTIVE PARTS PROBLEM...

  • Page 10: Test Procedure

    R-350C TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER MAGNETRON TEST NEVER TOUCH ANY PART IN THE CIRCUIT WITH YOUR HAND OR AN INSULATED TOOL WHILE THE OVEN IS IN OPERATION. CARRY OUT 3D CHECK. Isolate the magnetron from high voltage circuit by removing all leads connected to filament terminal.
  • Page 11 R-350C TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER Initial temperature ..................... T1 = 11 C Temperature after (42 + 2) = 44 sec..............T2 = 21 C Temperature difference Cold-Warm .............. T1 = 10 C Measured output power The equation is “P = 100 x T” ........... P = 100 x 10 C = 1000 Watts JUDGMENT: The measured output power should be at least 15 % of the rated output power.
  • Page 12 R-350C TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER HIGH VOLTAGE CAPACITOR TEST CARRY OUT 3D CHECKS. A. Isolate the high voltage capacitor from the circuit. B. Continuity check must be carried out with measuring instrument which is set to the highest resistance range.
  • Page 13 R-350C TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER If incorrect readings are obtained, replace the monitor resistor. CARRY OUT 4R CHECKS. MOTOR WINDING TEST CARRY OUT 3D CHECKS. Disconnect the leads from the motor. Using an ohmmeter, check the resistance between the two terminals as described in the table below.
  • Page 14 R-350C TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER TOUCH CONTROL PANEL ASSEMBLY TEST The touch control panel consists of circuits including semiconductors such as LSI, ICs, etc. Therefore, unlike conventional microwave ovens, proper maintenance cannot be performed with only a voltmeter and ohmmeter. In this service manual, the touch control panel assembly is divided into two...
  • Page 15 R-350C TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER RELAY TEST Remove the outer case and check voltage between Pin No 1 of the 2-pin connector (A) and the common terminal of the relay RY1 on the power unit with an A.C. voltmeter. The meter should indicate 230 - 240 volts, if not check oven circuit.

  • Page 16: Touch Control Panel

    R-350C TOUCH CONTROL PANEL ASSEMBLY OUTLINE OF TOUCH CONTROL PANEL The touch control section consists of the following units. 3) Power Source Circuit This circuit generates voltages necessary in the con- (1) Key Unit trol unit from the AC line voltage.
  • Page 17 R-350C LSI(IZA969DR) The I/O signal of the LSI(IZA969DR) is detailed in the following table. Pin No. Signal Description AN10 Signal coming from touch key. When either G10 line on key matrix is touched, a corresponding signal out of P10 - P17 will be input into AN10.
  • Page 18 R-350C Pin No. Signal Description Oven lamp, fan motor and turntable motor driving signal To turn on and off shut off relay (RY1). The 20.0 msec. square waveform voltage is delivered to the RY1 H : GND driving circuit and RY2 control circuit.
  • Page 19 R-350C TOUCH CONTROL PANEL SERVICING 1. Precautions for Handling Electronic Components both ends of the door sensing switch (on PWB) of the This unit uses CMOS LSI in the integral part of the touch control panel with a jumper, which brings about circuits.

  • Page 20: Component Replacement And Adjustment Procedure

    Please refer to ‘OVEN PARTS, CABINET PARTS, CONTROL PANEL PARTS, DOOR PARTS’, when carrying out any of the following removal procedures: WARNING FOR WIRING and Oven cavity. To prevent an electric shock, take the following 3) Sharp edge: manners. Bottom plate, Oven cavity, Waveguide flange, 1. Before wiring, Chassis support and other metallic plate.
  • Page 21 R-350C HIGH VOLTAGE RECTIFIER, HIGH VOLTAGE FUSE AND HIGH VOLTAGE CAPACITOR REMOVAL 1. CARRY OUT 3D CHECKS. 8. Remove one (1) screw holding high voltage rectifier 2. Disconnect the brown and blue wires of power supply assembly to capacitor holder.
  • Page 22 4. Where the corners have been snipped off bend corner areas flat. No sharp edge must be evident after removal NOTE: The one (1) screw to fit the turntable motor cover of the turntable motor cover.

  • Page 23: Power Supply Cord Replacement

    R-350C 2) Apply the screw lock tight into the hole (for shaft) of the 3. Catch three holes of fan duct on three tabs of the fan blade. waveguide flange. 3) Install the fan blade to the shaft of fan motor by pushing 4.
  • Page 24 R-350C 1ST. LATCH SWITCH, 2ND. LATCH SWITCH, STOP SWITCH AND MONITOR SWITCH ADJUSTMENT If the 1st. latch switch, 2nd. latch switch, stop switch and latch hook, pushing and pulling lower portion of the monitor switch do not operate properly due to a door toward the oven face.
  • Page 25 R-350C Note: The door on a microwave oven is designed to act SEALER FILM as an electronic seal preventing the leakage of Installation microwave energy from oven cavity during cook 1. Put the adhesive tape on the backing film of the sealer cycle.

  • Page 26: Microwave Measurement

    R-350C MICROWAVE MEASUREMENT After adjustment of door latch switches, monitor switch Recommended instruments are: and door are completed individually or collectively, the NARDA 8100 following leakage test must be performed with a survey NARDA 8200 instrument and it must be confirmed that the result meets...

  • Page 27: Wiring Diagram

    R-350C SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED NOTE: " " indicates components with potentials above 250V. 2. CLOCK APPEARS ON DISPLAY THERMAL CUT-OUT 2ND. LATCH 125˚C (OVEN) SWITCH FUSE M10A COM. COM. N.O. N.O. RY-1 RY-2 H. V. FUSE 0.75A...

  • Page 28: Pictorial Diagram

    R-350C RECTIFIER H.V.

  • Page 29: Power Unit Circuit

    R-350C CN-C 12PIN LEAD WIRE HARNESS Q2 2SB1238 R4 27 R5 4.7k D1-D4 11ES1 CN-A 1SS270A 1SS270A – – R2 510 1w R3 390 1/2w SP1 PKM22EPT OVEN LAMP TURNTABLE MOTOR FAN MOTOR Q3 KRC243M BUZZER R6 3.3k OVEN LAMP...

  • Page 30: Cpu Unit Circuit

    R-350C SEG6 SEG7 SEG8 SEG9 SEG10 SEG11 SEG12 SEG13 SEG14 SEG15 SEG16 SEG17 SEG18 SEG19 TEST SEG20 OSC1 OSC2 AVSS AN11 SEG35 AN10 4.7k C110 4.7k 4.7k 330pF/50v (J16) (J17) 330pF/50v 4.7k 330pF/50v (J14) (J15) 330pF/50v 4.7k 330pF/50v (J12) (J13) 330pF/50v 4.7k...

  • Page 31: Printed Wiring Board

    R-350C DEFROST COOK HELP SEG9 SEG35 SEG8 SEG36 SEG7 SEG37 SEG6 SEG38 SEG5 SEG39 SEG4 COM16 SEG3 COM15 /50v SEG2 COM14 SEG1 COM13 C129 SEG0 COM12 COM7 COM11 COM6 COM10 COM5 COM9 COM4 COM8 COM3 COM2 COM1 COM0 OSC1 OSC2...
  • Page 32 R-350C (CN - C) CN - C CN - B CN - A (CN - D) (D10) Figure S-5. Printed Wiring Board...

  • Page 33: Parts List

    R-350C PARTS LIST Note: The parts marked " " may cause undue microwave exposure. The parts marked "*" are used in voltage more than 250V. REF. NO. PART NO. DESCRIPTION Q'TY CODE ELECTRIC PARTS 1- 1 QSW-MA137WRE0 1st. latch switch/ 2nd. latch switch/ stop switch...
  • Page 34 R-350C Note: The parts marked " " may cause undue microwave exposure. The parts marked "*" are used in voltage more than 250V. REF. NO. PART NO. DESCRIPTION Q'TY CODE 4-13 PCUSUA511WRP0 Cushion 4-14 PCOVPA349WRE0 Waveguide cover 4-15 PCUSGA339WRP0 Cushion...

  • Page 35: Oven And Cabinet Parts

    R-350C OVEN AND CABINET PARTS 4-13 4-10 1-10 4-16 1-11 4-17 1-13 6-10 4-12 4-15 4-14 4-11 1-17 1-12 1-15 1-14 4-15 4-19 1-16 4-18...
  • Page 36 R-350C CONTROL PANEL PARTS 3-3-1 DOOR PARTS MISCELLANEOUS Actual wire harness may be different from illustration. '99SHARP CORP. (6S0.730E) Printed in Australia...

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