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