SHARP R305HD Service Manual
SERVICE MANUAL
S5406R305HPD/
MICROWAVE OVEN
R-305HD
MODEL
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..)
This is a supplemental Service Manual for Model R-305HD. This mode is quite similar to base models R-305HK/R-305HW.
Use this supplemental manual together with the Base Model Service Manual (Refer No. is S2304R305HPW/) for complete
operation, service information, etc..
TABLE OF CONTENTS
PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO
AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY ................... INSIDE FRONT COVER
BEFORE SERVICING ......................................................................................................INSIDE FRONT COVER
OVEN SCHEMATIC ............................................................................................................................................... 1
TEST PROCEDURE .............................................................................................................................................. 2
PARTS LIST .......................................................................................................................................................... 3
PACKING AND ACCESSORIES ........................................................................................................................... 5
R-305HD
Page
SHARP CORPORATION
This document has been published to be used for after
sales service only.
The contents are subject to change without notice.
R-305HD
PRECAUTIONS TO BE OBSERVED BEFORE AND
DURING SERVICING TO AVOID POSSIBLE
EXPOSURE TO EXCESSIVE MICROWAVE
ENERGY
(a) Do not operate or allow the oven to be operated with the door open.
(b) Make the following safety checks on all ovens to be serviced before activating the magnetron or other
microwave source, and make repairs as necessary: (1) interlock operation, (2) proper door closing, (3)
seal and sealing surfaces (arcing, wear, and other damage), (4) damage to or loosening of hinges and
latches, (5) evidence of dropping or abuse.
(c) Before turning on microwave power for any service test or inspection within the microwave generating
compartments, check the magnetron, wave guide or transmission line, and cavity for proper alignment,
integrity, and connections.
(d) Any defective or misadjusted components in the interlock, monitor, door seal, and microwave
generation and transmission systems shall be repaired, replaced, or adjusted by procedures described
in this manual before the oven is released to the owner.
(e) A microwave leakage check to verify compliance with the Federal Performance Standard should be
performed on each oven prior to release 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 @1-800-237-4277.
If the unit operates with the door open, service person should 1) tell the user not to operate the oven
and 2) contact SHARP ELECTRONICS CORPORATION and Food and Drug Administration's
Center for Devices and Radiological Health immediately.
Service personnel should inform SHARP ELECTRONICS CORPORATION of any certified unit found
with emissions in excess of 4mW/cm
until the oven has been brought into compliance.
2
. The owner of the unit should be instructed not to use the unit
R-305HD
NOTE: CONDITION OF OVEN
SCHEMATIC
1. DOOR CLOSED
2. CLOCK APPEARS ON DISPLAY
THERMAL CUT-OUT
145ßC (OVEN)
OR
FUSE 150ßC (OVEN)
OL
(RY1)
COM.
120V AC
60 Hz
C/T FUSE TEMPERATURE
GRN
OVEN LAMP
RELAY
N.O.
CONTROL UNIT
OVEN
LAMP
SECONDARY
INTERLOCK
SWITCH
NOTE: " " indicates components with potential above 250V.
POWER
MONITOR
SWITCH
TRANSFORMER
CAPACITOR
0.94 F
AC 2200V
RECTIFIER
TTM
TURNTABLE
MOTOR
FM
FAN
MOTOR
N.O.
COM.
B2
PRIMARY
INTERLOCK
RELAY
DOOR
SENSING
SWITCH
(RY2)
B1
Figure O-1. Oven Schematic-Off Condition
MAGNETRON
NOTE: CONDITION OF OVEN
SCHEMATIC
1. DOOR CLOSED
2. COOKING TIME PROGRAMMED
3. VARIABLE COOKING CONTROL "P-HI" (100%)
4. "START" PAD TOUCHED
THERMAL CUT-OUT
145ßC (OVEN)
(RY1)
OR
FUSE 150ßC (OVEN)
OL
SECONDARY
INTERLOCK
SWITCH
COM.
CONTROL UNIT
OVEN
LAMP
TTM
TURNTABLE
MOTOR
120V AC
60 Hz
C/T FUSE TEMPERATURE
GRN
OVEN LAMP
RELAY
N.O.
FM
FAN
MOTOR
N.O.
COM.
B2
PRIMARY
INTERLOCK
RELAY
DOOR
SENSING
SWITCH
(RY2)
POWER
TRANSFORMER
CAPACITOR
0.94 F
AC 2200V
B1
MONITOR
SWITCH
RECTIFIER
MAGNETRON
Figure O-2. Oven Schematic-Cooking Condition
1
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