MODELS R-22AT
TABLE OF CONTENTS
SHARP CORPORATION
COMMERCIAL MICROWAVE OVEN
WARNING AGAINST THE CHARGE OF THE TWO HIGH-VOLTAGE CAPACITORS
WARNING TO SERVICE PERSONNEL
SERVICING
REMEMBER TO CHECK 3D
MICROWAVE RADIATION
SHARP CORPORATION OSAKA, JAPAN
COMMERCIAL MICROWAVE OVEN R-22AT/ R-24AT
GENERAL IMPORTANT INFORMATION
PRODUCT DESCRIPTION
SPECIFICATION
DESCRIPTION
THIS APPLIANCE MUST BE EARTHED
AUTO TOUCH CONTROL PANEL
INSTALLATION INFORMATION
DISPLAY AND INDICATORS
APPEARANCE VIEW
MICROWAVE VARIABLE COOKING
OPERATION SEQUENCE
IDLE CONDITION
MICROWAVE COOKING CONDITION
TWO MAGNETRON OPERATION SYSTEM
Figure B-1. High Voltage Circuit
Figure B-2. Operation of Magnetron
EXHAUST TEMPERATURE FUSE TF3
INTERLOCK SWITCHES SW1, SW2 AND STOP SWITCH SW5
MONITOR SWITCHES SW3, SW4
MAGNETRON TEMPERATURE FUSES TF1, TF2
BLOWER MOTOR BM
TROUBLESHOOTING GUIDE
EXHAUST OVEN THERMISTOR TH3
MAGNETRON THERMISTORS TH1, TH2
POSSIBLE CAUSE AND DEFECTIVE PARTS
TESTPROCEDURE
LETTER
TEST PROCEDURES
PROCEDURE
MICROWAVE OUTPUT POWER 1 litre water load
PROCEDURE
power
MICROWAVE OUTPUT POWER 2000 cc alternative method
TEST PROCEDURES
CARRY OUT 4R CHECKS
C HIGH VOLTAGE RECTIFIER ASSEMBLY TEST CARRY OUT 3D CHECKS
E SWITCH TEST
B HIGH VOLTAGE TRANSFORMER TEST
G FUSE F1, F2 F10A TEST CARRY OUT 3D CHECKS
CAUTION Only replace weak point F3 with the correct value replacement
H TEMPERATURE FUSE TF1, TF2, TF3 TEST
F WEAK POINT F3 TEST CARRY OUT 3D CHECKS
K NOISE FILTER TEST
M TOUCH CONTROL PANEL ASSEMBLY TEST
3. CARRY OUT 4R CHECKS
J MOTOR WINDING TEST
PROCEDURE
N KEY UNIT TEST
O RELAY TEST
TEST PROCEDURES
COMPONENT TEST
TEST PROCEDURES
PROCEDURE
LETTER
11 Stop Switch Circuit
TOUCH CONTROL PANEL ASSEMBLY
1 Power Supply Circuit
2 Reset Circuit
Temperature measurement input MAGNETRON THERMISTOR TH2
Signal
Power source voltage GND
Temperature measurement input EXHAUST THERMISTOR
Power source voltage
Signal to sound buzzer
Signal synchronized with commercial power source frequency
Internal clock oscillation frequency setting input
Signal
Digit selection signal
Key strobe signal
Sound Voltage level control terminal
2. Shapes of Electronic Components
Figure T-2. Relation between Pin Nos, and Signals
2-2 Memory IC
SERVICING
PROCEDURE FOR CHECKING/CLEARING SERVICE COUNTS OF MICROWAVE OVEN
5. Other Precautions
4. Servicing Tools
OTHER CHECKING AND CLEARING PROCE- DURE FOR
PROCEDURE FOR ENTERING TO
3. Soldering
PRECAUTIONS FOR USING LEAD-FREE SOLDER
2. Using lead-free wire solder
1. Employing lead-free solder
To remove rear cabinet and power supply cord
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE
OUTER CASE, REAR CABINET AND POWER SUPPLY CORD REMOVAL
precautions
Figure C-1. Magnetron thermistor installation
MAGNETRON THERMISTOR REPLACEMENT
ASSEMBLY REMOVAL
Re-install
Figure C-2. How to release the positive lock connector
HOW TO RELEASE THE POSITIVE LOCK CONNECTOR
TERMINAL INSULATOR REPLACEMENT
Procedure
HOW TO ATTACH MEMBRANE SWITCH AND GRAPHIC SHEET
CONTROL PANEL ASSEMBLY AND CONTROL UNIT REMOVAL
POWER SUPPLY CORD REPLACEMENT
CONTROL PANEL ASSEMBLY REMOVAL
Figure C-4. Power supply cord replacement
INTERLOCK SWITCHES, MONITOR SWITCHES, AND STOP SWITCH REMOVAL
INTERLOCK SWITCHES, MONITOR SWITCHES, AND STOP SWITCH ADJUSTMENT
DOOR REPLACEMENT AND ADJUSTMENT
DOOR ADJUSTMENT
DOOR DISASSEMBLY
RE-INSTALL
Note After any service to the door
DOOR GLASS REMOVAL
SERVICE INFORMATION
UPPER AND LOWER LATCH HEADS REMOVAL
DOOR CASE REMOVAL
PROCEDURE
MICROWAVE MEASUREMENT
PREPARATION
SCHEMATIC NOTE CONDITION OF OVEN 1. FOR 1MINUTE AFTER DOOR CLOSED
Figure O-1 Oven Schematic-OFF Condition
Figure O-2 Oven Schematic-IDLE Condition Door opened condition
SCHEMATIC NOTE CONDITION OF OVEN
4. START PAD TOUCHED
Figure O-3 Oven Schematic-Cooking Condition
SCHEMATIC NOTE CONDITION OF OVEN 1. DOOR CLOSED
2. MANUAL REPEAT KEY TOUCHED 3. COOKING TIME PROGREMMED
VOLTAGE
Figure S-1. Pictrorial Diagram
COMPONENTS
A B C
Control2
PanelCircuit
A B C D E
Figure S-3. Printed Wiring Board
BLACK 2.5A FUSE
A B C D E F G H
ELECTORIC PARTS
PARTS LIST
Note The parts marked ∆ may cause undue microwave exposure
The parts marked * are used in voltage more than
CODE
OVEN PARTS
REF. NO
DESCRIPTION
REF. NO
DOOR PARTS
MISCELLANEOUS
SCRE,NUTS AND WASHERS
4. DESCRIPTION
PACKING AND ACCESSORIES
HOW TO ORDER REPLACEMENT PARTS
1. MODEL NUMBER 2. REF. NO
OVEN AND CABINET PARTS
F G H
A2 A1
3-2-2 3-2-3
CONTROL PANEL PARTS
DOOR PARTS
MISCELLANEOUS