Sharp R-cd1800m Service Manual

							PRECAUTIONS TO BE OBSERVED BEFORE AND
DURING SERVICING TO AVOID POSSIBLE EXPO-
SURE TO EXCESSIVE MICROWAVE ENERGY
CHAPTER 1. WARNING TO SERVICE PERSONNEL
CHAPTER 2. MICROWAVE MEASUREMENT PRO-
CEDURE
CHAPTER 3. FOREWORD AND WARNING
CHAPTER 4. PRODUCT DESCRIPTION
CHAPTER 5. OPERATION
CHAPTER 6. TROUBLESHOOTING GUIDE CHAPTER 7. TEST PROCEDURES
CHAPTER 8. TOUCH CONTROL PANEL ASSEMBLY
CHAPTER 9. PRECAUTIONS FOR USING LEAD-
FREE SOLDER
CHAPTER 10. COMPONENT REPLACEMENT AND 
ADJUSTMENT PROCEDURE
CHAPTER 11. CIRCUIT DIAGRAMS
Parts List
S2801RCD22MP
SERVICE MANUAL
RCD2200M
CONTENTS
This document has been published to be used for
after sales service only.
The contents are subject to change without notice. TopPage
COMMERCIAL MICROWAVE OVEN
R-CD1800M
R-CD2200MMODELS
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..) 
						

							CONTENTS
PRECAUTIONS TO BE OBSERVED BEFORE
AND DURING SERVICING TO AVOID POSSIBLE
EXPOSURE TO EXCESSIVE MICROWAVE ENER-
GY
CHAPTER 1. WARNING TO SERVICE PERSON-
NEL
[1] Before Servicing.......................................... 1-1
[2]  When the testing is completed, ................... 1-1
[3] After repairing.............................................. 1-1
CHAPTER 2. MICROWAVE MEASUREMENT 
PROCEDURE
CHAPTER 3. FOREWORD AND WARNING
CHAPTER 4. PRODUCT DESCRIPTION
[1] SPECIFICATIONS ...................................... 4-1
[2] GROUNDING INSTRUCTIONS.................. 4-1
[3] OVEN DIAGRAM ........................................ 4-2
CHAPTER 5. OPERATION
[1]  DESCRIPTION OF OPERATING SE-
QUENCE .................................................... 5-1
[2] OVEN SCHEMATIC .................................... 5-2
[3]  DESCRIPTION AND FUNCTION OF 
COMPONENTS .......................................... 5-3
CHAPTER 6. TROUBLESHOOTING GUIDE 
CHAPTER 7. TEST PROCEDURES
[1]  A: MAGNETRON ASSEMBLY TEST .......... 7-1
[2]  B: POWER TRANSFORMER TEST ........... 7-1
[3]  C: HIGH VOLTAGE RECTIFIER (1) 
AND/OR (2) TEST ...................................... 7-1
[4]  D: HIGH VOLTAGE CAPACITOR (1) 
AND/OR (2) TEST ...................................... 7-2
[5]  E: SECONDARY INTERLOCK SWITCH 
(1) AND/OR (2) TEST ................................. 7-2
[6]  F: PRIMARY INTERLOCK SYSTEM 
TEST ........................................................... 7-2
[7]  G: MONITOR SWITCH (1) AND/OR (2) 
TEST ........................................................... 7-3
[8]  H: BLOWN MINITOR FUSE TEST ............. 7-3
[9]  I: FUSE 12A (1) (2) TEST ........................... 7-3
[10]  J: TEMPERATURE FUSE TEST ................ 7-4
[11]  K: MAGNETRON THERMISTOR TEST..... 7-4
[12]  L: EXHAUST THERMISTOR TEST ............ 7-4
[13]  M: NOISE FILTER TEST ............................ 7-5
[14]  N: KEY UNIT TEST..................................... 7-5
[15]  O: CONTROL UNIT TEST .......................... 7-6
[16]  P: POWER UNIT TEST .............................. 7-6
[17]  Q: RELAY UNIT TEST ................................ 7-6
[18]  R: ANTENNA SENSOR TEST .................... 7-7
[19]  S: MICROWAVE SENSOR TEST ............... 7-7CHAPTER 8. TOUCH CONTROL PANEL ASSEM-
BLY
[1] SPECIAL FUNCTION FOR SERVICING..... 8-1
[2]  SERVICING FOR BRINTED WIRING 
BOARDS ..................................................... 8-6
CHAPTER 9. PRECAUTIONS FOR USING LEAD-
FREE SOLDER
CHAPTER 10. COMPONENT REPLACEMENT 
AND ADJUSTMENT PROCEDURE
[1] WARNINGS .............................................. 10-1
[2]  OUTER CASE AND REAR COVER RE-
MOVAL ...................................................... 10-1
[3]  POWER TRANSFORMERS (1) AND/
OR (2) REMOVAL ..................................... 10-2
[4]  MAGNETRONS (1) AND/OR (2) RE-
MOVAL ...................................................... 10-2
[5] MAGNETRON THERMISTOR ASSEM-
BLY REPLACEMENT ............................... 10-2
[6]  HIGH VOLTAGE CAPACITOR AND 
HIGH VOLTAGE RECTIFIER ASSEM-
BLY REMOVAL ......................................... 10-2
[7]  POWER SUPPLY CORD REPLACE-
MENT ........................................................ 10-3
[8]  HOW TO RELEASE THE POSITIVE 
LOCK CONNECTOR. ............................... 10-3
[9]  EXHAUST FAN REMOVAL ....................... 10-4
[10] FAN MOTORS REMOVAL ........................ 10-4
[11]  ANTENNA MOTORS (UPPER AND 
LOWER) REMOVAL ................................. 10-4
[12]  POWER UNIT REMOVAL ......................... 10-4
[13]  RELAY UNIT REMOVAL ........................... 10-4
[14]  CONTROL PANEL ASSEMBLY AND 
CONTROL UNIT REMOVAL ..................... 10-4
[15]  DOOR SENSING SWITCH/SECOND-
ARY INTERLOCK SWITCHES (1), (2) 
AND MONITOR SWITCHES (1), (2) RE-
PLACEMENT ............................................ 10-5
[16]  DOOR SENSING SWITCH/SECOND-
ARY INTERLOCK SWITCHES (1), (2) 
AND MONITOR SWITCHES (1), (2) AD-
JUSTMENT ............................................... 10-5
[17] DOOR REPLACEMENT ........................... 10-6
[18] DOOR DISASSEMBLY ............................. 10-7
CHAPTER 11. CIRCUIT DIAGRAMS
[1]  Figure S-1. Pictorial Diagram .....................11-1
[2]  Figure S-2. Switching Power Supply Unit 
Circuit .........................................................11-4
[3]  Figure S-3. Relay Unit Circuit ....................11-5
[4]  Figure S-4. Control Unit/ Antenna sen-
sor/ Microwave Sensor Circuit ...................11-6
[5]  Figure S-5. Printed Wiring Board ...............11-7
Parts List 
						

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[3] OVEN DIAGRAM
1. OVEN
1. Touch control panels
2. Door latch openings
3. Ceramic shelf
4. Splash cover
5. Oven light
6. Air intake filter
7. Air intake openings
8. Door seals and sealing surfaces
9. Door hinges
10. Oven door with see-through window
11. Door latches   
12. Door handle 
13. Service window for replacing the oven light bulb
14. Ventilation openings15. Power supply cord
16. Mounting plate
17. Screw for mounting plate
18. Oven ceiling cover
2. TOUCH CONTROL PANEL
1. SELECT TIME pad
2. SELECT POWER pad
3. DOUBLE/TRIPLE QUANTITY pad
4. CUSTOM HELP pad
5. STOP/CLEAR pad
6. START pad
7. Ten number pads
8. EXPRESS DEFROST pad
9. SET MEMORY pad
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[2] OVEN SCHEMATIC
1. Off Condition
Figure O-1. Oven Schematic-Off Condition
2. Cooking Condition
Figure O-2. Oven Schematic-Cooking Condition SCHEMATIC
NOTE: CONDITION OF OVEN
1. DOOR CLOSED
2. “   .   “ APPEARS ON DISPLAY
SCHEMATIC
NOTE: CONDITION OF OVEN
1. DOOR CLOSED.
2. SELECT TIME PAD TUCHED..
3. COOKING TIME PROGRAMMED.
4. START PAD TOUCHED.