Sharp R-21JCAF Service Manual

Sharp R-21JCAF Manual

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  • Sharp R-21JCAF | Service Manual - Page 1
    1000W/ R-21JCA COMMERCIAL MICROWAVE OVEN R-21JCA-F SERVICE MANUAL S0514R21JCPAF LIGHT DUTY COMMERCIAL MICROWAVE OVENS TIME GUIDE FOR ONE SERVING 15 - 30 sec. Bagel, Roll Muffin, Pastry Pie Slice 1 - 2 min. Beverage, Soup Large Sandwich Popcorn, 1.5 oz. 30 - 60 sec. Hot Dog Pizza
  • Sharp R-21JCAF | Service Manual - Page 2
    to the owner. BEFORE SERVICING Before servicing an operative unit, perform a microwave emission check as per the Microwave Measurement Procedure outlined in this service manual. If microwave emissions level is in excess of the specified limit, contact SHARP ELECTRONICS CORPORATION immediately @1-800
  • Sharp R-21JCAF | Service Manual - Page 3
    21JCA-F WARNING TO SERVICE PERSONNEL Microwave the Service Manual carefully and follow all instructions. Don't Touch ! Danger High Voltage Before Servicing 1. chassis with the use of an insulated screwdriver. Whenever troubleshooting is performed the power supply must be disconnected.
  • Sharp R-21JCAF | Service Manual - Page 4
    sure that the actual instrument is operating normally as specified in its instruction booklet. Important: Survey instruments that comply with the requirement for instrumentation as prescribed by the performance standard for microwave ovens, 21 CFR 1030.10(c)(3)(i), must be used for testing. 2) Place
  • Sharp R-21JCAF | Service Manual - Page 5
    SERVICE MANUAL LIGHT DUTY COMMERCIAL MICROWAVE OVEN R-21JCA-F FOREWORD This Manual has been prepared to provide Sharp Electronics Corp. Service Personnel with Operation and Service Information for the SHARP MICROWAVE OVENS, R-21JCA-F. It is recommended that service personnel carefully study the
  • Sharp R-21JCAF | Service Manual - Page 6
    R-21JCA-F ITEM Power Requirements Power Output Case Dimensions Cooking Cavity Dimensions (1.0 Authorized DHHS Rules, CFR, Title 21, Chapter 1, Subchapter J, NSF Certified GENERAL INFORMATION GROUNDING INSTRUCTIONS This oven is equipped with a three prong grounding plug. It must be plugged into
  • Sharp R-21JCAF | Service Manual - Page 7
    21JCA cord 15. Air intake openings 16. Outer case cabinet CONTROL PANEL TIME GUIDE FOR ONE SERVING 15 - 30 sec. Bagel, Roll Muffin, Pastry A K 0 L 2.5 M 3 N O T 6 S R 5 Q P 4 INSTRUCTIONS With the door closed,turn the timer to the desired time. Oven will begin operating immediately.
  • Sharp R-21JCAF | Service Manual - Page 8
    R-21JCA-F OPERATION DESCRIPTION OF OPERATING SEQUENCE The following is a description of the cooking time, the power transformer, oven lamp, etc. are turned off, and the generation of microwave energy is stopped. The oven will revert to the OFF condition. 6. When the door is opened during a
  • Sharp R-21JCAF | Service Manual - Page 9
    125V A3 A1 DOOR SENSING SWITCH OL FM AM OVEN LAMP FAN MOTOR ANTENNA MOTOR SECONDARY INTERLOCK SWITCH Figure O-2 Oven Schematic-Microwave cooking Condition CAPACITOR 0.94 µF 2400V RY1 PRIMARY INTERLOCK RELAY RY2 COOK RELAY MONITOR SWITCH RECTIFIER MAGNETRON RY1 PRIMARY INTERLOCK RELAY RY2
  • Sharp R-21JCAF | Service Manual - Page 10
    R-21JCA-F DESCRIPTION AND FUNCTION OF COMPONENTS DOOR OPEN MECHANISM The door is opened by grasping the door handle, refer to Figure D-1. When the door handle is
  • Sharp R-21JCAF | Service Manual - Page 11
    R-21JCA-F TROUBLESHOOTING GUIDE Never touch any part in the circuit with your hand or an uninsulated tool while the power supply is connected. When troubleshooting the microwave oven, it is helpful to follow the Sequence of Operation in performing the checks. Many of the possible causes of trouble
  • Sharp R-21JCAF | Service Manual - Page 12
    R-21JCA-F PROCEDURE LETTER A TEST PROCEDURES COMPONENT TEST MAGNETRON ASSEMBLY TEST 1. installed. 9. Run the oven and check all functions. MICROWAVE OUTPUT POWER The following test procedure should be carried out with the microwave oven in a fully assembled condition (outer case fitted).
  • Sharp R-21JCAF | Service Manual - Page 13
    R-21JCA-F PROCEDURE LETTER C TEST PROCEDURES COMPONENT TEST HIGH VOLTAGE RECTIFIER TEST 1. restricted air flow through the vent holes of the oven cavity, especially the cooling fan and air guide. 5. Reconnect all leads removed from components during testing. 6. Reinstall the outer case (cabinet).
  • Sharp R-21JCAF | Service Manual - Page 14
    R-21JCA-F PROCEDURE LETTER F TEST PROCEDURES COMPONENT TEST SECONDARY INTERLOCK SWITCH TEST 1. Disconnect the power supply cord, and then remove outer case. 2. Open the door and block
  • Sharp R-21JCAF | Service Manual - Page 15
    R-21JCA-F PROCEDURE LETTER H TEST PROCEDURES COMPONENT TEST BLOWN MONITOR FUSE TEST 1. Disconnect etc. Therefore, unlike conventional microwave ovens, proper maintenance cannot be performed with only a voltmeter and ohmmeter. In this service manual troubleshooting by unit replacement is described
  • Sharp R-21JCAF | Service Manual - Page 16
    R-21JCA-F group of LEDs do not light up. f) The LEDs flicker. 1-2 Other possible troubles caused by defective control unit. a) Buzzer does not sound or continues to sound. at the relay coil with a D.C. voltmeter during the microwave cooking operation. DC. voltage indicated Defective relay. DC.
  • Sharp R-21JCAF | Service Manual - Page 17
    R-21JCA-F PROCEDURE LETTER L TEST PROCEDURES COMPONENT TEST FOIL PATTERN ON THE after the outer case is installed. 9) Run the oven and check all function. 2. Follow the troubleshooting guide given below, if indicator does not light up after above check and repairs are finished. 1) Disconnect
  • Sharp R-21JCAF | Service Manual - Page 18
    R-21JCA-F TOUCH CONTROL PANEL ASSEMBLY OUTLINE OF TOUCH CONTROL PANEL Control Unit Control unit consists of LSI, power source circuit, synchronizing signal circuit, reset circuit, buzzer
  • Sharp R-21JCAF | Service Manual - Page 19
    R-21JCA-F Pin No. Signal I/O 9 RESET IN 10 CNVSS IN 11 XOUT OUT 12 turn on and off the cook relay (RY2). In 100% power operation, the signals hold "H" level during microwave cooking and "L" level while not cooking. Oven lamp, turntable motor and fan motor driving signal(Square Waveform :
  • Sharp R-21JCAF | Service Manual - Page 20
    R-21JCA-F TOUCH CONTROL PANEL SERVICING 1. Precautions for Handling Electronic Components This unit uses supply of the oven : CAUTION: THE HIGH VOLTAGE TRANSFORMER OF THE MICROWAVE OVEN IS STILL LIVE DURING SERVICING AND PRESENTS A HAZARD . Therefore, before checking the performance of the touch
  • Sharp R-21JCAF | Service Manual - Page 21
    PRECAUTIONS FOR USING LEAD-FREE SOLDER R-21JCA-F 1. Employing lead-free solder The "Main PWB" of this model employs lead-free solder. This is indicated by the "LF" symbol printed on the PWB and in the service manual. The suffix letter indicates the alloy type of the solder. Example: Sn-Ag-Cu
  • Sharp R-21JCAF | Service Manual - Page 22
    21JCA-F COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE WARNING AGAINST HIGH VOLTAGE: Microwave microwave energy. Please follow the instructions RF gasket (Magnetron). 2. If the wave guide or oven cavity are not intact. 3. Sharp edge: Bottom plate, Oven cavity, Waveguide flange, Chassis support
  • Sharp R-21JCAF | Service Manual - Page 23
    R-21JCA-F HIGH VOLTAGE RECTIFIER ASSEMBLY AND HIGH VOLTAGE CAPACITOR REMOVAL To insertion plate A. 7. Remove the one (1) screw holding the chassis support to the magnetron. 8. Release the tabs of air intake duct from the chassis support and the oven cavity. 9. Move the air intake duct to the
  • Sharp R-21JCAF | Service Manual - Page 24
    R-21JCA-F POSITIVE LOCK® CONNECTOR (NO-CASE TYPE) REMOVAL 1. Disconnect the power supply cord blade to the fan motor shaft according to the following procedure. 3. Hold the center of the bracket which supports the shaft of the fan motor on the flat table. 4. Install the fan blade to the shaft of
  • Sharp R-21JCAF | Service Manual - Page 25
    R-21JCA-F POWER SUPPLY CORD REPLACEMENT Removal 1. Disconnect the power supply cord and Plate Power Supply Cord Screw Green Wire Black Wire RED White Wire L WHT N Noise Filter Chassis Support 7. Now, the power supply cord is free. Re-install 1. Insert the moulding cord stopper of
  • Sharp R-21JCAF | Service Manual - Page 26
    21JCA warp the slit choke (tabs on the door panel assembly) to prevent microwave leakage. Choke Cover Putty Knife Door Frame Figure C-6. Door Disassembly 7. Release -install choke cover to door panel by pushing. NOTE: After any service to the door; (A) Make sure that door sensing switch and secondary
  • Sharp R-21JCAF | Service Manual - Page 27
    R-21JCA-F (B) An approved microwave survey meter should be used to assure compliance with proper microwave radiation emission limitation standards. (Refer to Microwave Measurement Procedure.) After any service, make sure of the following : 1. Door latch heads smoothly catch latch hook through latch
  • Sharp R-21JCAF | Service Manual - Page 28
    R-21JCA-F To left wall of Flat face oven cavity Antenna motor shaft Antenna holder Hole To right wall of oven is not caught between the oven door and the oven cavity front plate, to avoid possible exposure to excessive microwave energy. Oven Cavity Rear Edge Push Front Edge Ceramic Shelf 26
  • Sharp R-21JCAF | Service Manual - Page 29
    NOISE FILTER BRN BLU THERMAL CUT-OUT 145°C(MAG.) WHT ORG ORG FAN MOTOR HIGH VOLTAGE COMPONENTS MAGNETRON H.V. RECTIFIER WHT WHT RED POWER TRANSFORMER H.V. CAPACITOR A A 6 5 4 3 2 1 R-21JCA-F
  • Sharp R-21JCAF | Service Manual - Page 30
    R-21JCA-F A B C D E F G H 1 1 2 2 3 3 AC A5 (J1) R11 2W 100 VRS1 10G471K 1N4005E x 4 C1 D3 2.2µ/160VAC D1 R12 1/2W 100K ICP1 D4 D2 C2 0.1µ/50 V C3 1000µ/35V R7
  • Sharp R-21JCAF | Service Manual - Page 31
    R-21JCA-F 1 2 3 4 5 6 A A B C D E F G H 1 JP37 JP38 D80 D76 JP39 JP36 D71 D72 JP34 JP35 LD6 LD5 LD7 LD4 LD8 LD3 LD9 LD2 LD1 SW1 D79 D75 JP33 LD10 LD11
  • Sharp R-21JCAF | Service Manual - Page 32
    R-21JCA-F 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. guide HV capacitor holder Fan blade Fan duct Stirrer antenna assembly Insertion cushion Insertion plate A VCP cap Chassis support
  • Sharp R-21JCAF | Service Manual - Page 33
    R-21JCA-F REF. NO. 4-34 4-35 4-36 4-37 4-38 4-39 4-40 4-41 ∆ 5- 1 ∆ 5-1-1 5-1-2 ∆ 5-1-3 ∆ 5-1-4 5-1-4-1 5-1-4-2 5-1-4-3 5-1-4-4 5-1-4-5 5-1-5 5-1-6 ∆ 5-1-7 ∆ 5-1-8 Choke cover Door badge MISCELLANEOUS Instruction book Main wire harness Parts from the authorized SHARP parts Distributor for your
  • Sharp R-21JCAF | Service Manual - Page 34
    R-21JCA-F 1 2-1 A 2 7-3 3 4 5 OVEN AND CABINET PARTS 7-3 7-3 1-10 1-9 4-28 7-13 6 A B 6-8 7-6 4-34 C 4-14 D 4-21 4-40 4-23 4-24 4-27 4-19 4-2 4-20 7-3 4-9 6-6 B 4-10 4-26 4-25 7-12 7-1 1-4 1-13 6-4 7-13 4-26 4-32 6-5 6-3 4-15 7-7 7-
  • Sharp R-21JCAF | Service Manual - Page 35
    1 2 3 CONTROL PANEL PARTS A 3-2 B 3-2-2 3-2-1 R-21JCA-F 4 5 6 3-1 3-5 A 3-5 B C 3-3 D E 5-1-4 F 5-3 5-1-5 G 5-1-6 5-1-10 H DOOR PARTS C 3-4 5-1 5-1-14 5-1-12 5-1-16 5-1-15 5-1-2 5-1-16 5-2 D 5-1-18 5-1-4-2 5-1-16 5-1-4-4 5-1-4-5 x4 5-1-13 5-1-4-3 5-1-4-1 E
  • Sharp R-21JCAF | Service Manual - Page 36
    MENU STICKER 6-1 INSTRUCTION BOOK InOtovethneCavity Not Replaceable Items. TOP PAD ASSEMBLY (FPADBA385WRK0) WRAP COVER (SSAKHA034WRE0) DOOR PROTECTION SHEET (SPADPA204WRE0) BOTTOM PAD ASSEMBLY (FPADBA386WRK0) PACKING CASE SPAKCD803WREZ COPYRIGHT © 2005 BY SHARP CORPORATION ALL RIGHTS RESERVED
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R-21JCA-F
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.
WARNING TO SERVICE PERSONNEL: Microwave ovens contain
circuitry capable of producing very high voltage and current,
contact with following parts may result in a severe, possibly fatal,
electrical shock. (High Voltage Capacitor, High Voltage Power
Transformer, Magnetron, High Voltage Rectifier Assembly,
High
Voltage Harness etc..)
TABLE OF CONTENTS
Page
PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO
AVOID POSSIBLE
EXPOSURE TO EXCESSIVE MICROWAVE ENERGY
...................
INSIDE FRONT COVER
BEFORE SERVICING
......................................................................................................
INSIDE FRONT COVER
WARNING TO SERVICE PERSONNEL
................................................................................................................
1
MICROWAVE MEASUREMENT PROCEDURE
...................................................................................................
2
FOREWORD AND WARNING
...............................................................................................................................
3
PRODUCT SPECIFICATIONS
..............................................................................................................................
4
GENERAL
INFORMATION
...................................................................................................................................
4
OPERATION
..........................................................................................................................................................
6
TROUBLESHOOTING GUIDE
..............................................................................................................................
9
TEST PROCEDURE
............................................................................................................................................
10
TOUCH CONTROL PANEL
.................................................................................................................................
16
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE
................................................................
20
PICTORIAL DIAGRAM
........................................................................................................................................
27
CONTROL PANEL
CIRCUIT
..............................................................................................................................
28
PRINTED WIRING BOARD
.................................................................................................................................
29
PARTS LIST
........................................................................................................................................................
30
PACKING AND ACCESSORIES
.........................................................................................................................
34
S0514R21JCPAF
R-21JCA-F
LIGHT DUTY
COMMERCIAL
MICROWAVE OVENS
MODEL
SERVICE MANUAL
SHARP CORPORATION
This document has been published to be used for after
sales service only.
The contents are subject to change without notice.
1000W/ R-21JCA
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TIME GUIDE FOR ONE SERVING
15 - 30 sec.
Bagel, Roll
Muffin, Pastry
Pie Slice
30 - 60 sec.
Hot Dog
Pizza Slice
Small Sandwich
1 - 2 min.
Beverage, Soup
Large Sandwich
Popcorn, 1.5 oz.
2 - 3 min.
Casserole, Stew
Chili, Chowder
Popcorn, 3.5 oz.
With the door closed,turn the timer to
the desired time.
Oven will begin
operating immediately.
To shut oven off manually,return timer
to "0".
INSTRUCTIONS
0
10
20
30
40
50
1
1.5
2
2.5
3
4
5
6
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T