Service manual

14
R-820BK
R-820BW
CK = Check / RE = Replace
ABCDEEFFGH I I JLMNNNNNNOP RERERERERE CK CK CK TEST PROCEDURE
MAGNETRON POWER TRANSFORMER H.V. RECTIFIER ASSEMBLY HIGH VOLTAGE CAPACITOR THERMAL CUT-OUT 170˚C THERMAL CUT-OUT 125˚C SECONDARY INTERLOCK SWITCH PRIMARY INTERLOCK SYSTEM MONITOR SWITCH MONITOR FUSE TOP HEATERS BOTTOM HEATER THERMISTOR TOUCH CONTROL PANEL KEY UNIT RELAY RY1 RELAY RY2 RELAY RY3 RELAY RY4 RELAY RY5 RELAY RY6 COMPU DEFROST FOIL PATTURN ON P.W.B. FAN MOTOR CONVECTION MOTOR TURNTABLE MOTOR POWER SUPPLY CORD OVEN LAMP OR SOCKET SHORTED WIRE HARNESS OPENED WIRE HARNESS MIS-ADJUSTMENT OF SWITCHES
CONDITION PROBLEM
POSSIBLE CASE
AND 
DEFECTIVE PARTS
Monitor fuse blows when power
cord is plugged into wall outlet.
Monitor fuse blows when the door
is opened.
Oven lamp does not light when
door is opened. (Display operates.)
Home fuse blows when power cord
is plugged into wall outlet.
"SHARP SIMPLY ..... PRESS CLOCK"
does not appear in display when
power cord is plugged into wall outlet.
Display does not operate properly
when STOP/CLEAR pad is pressed.

Oven does not start when the
START pad is pressed. (Display
operates.)
Oven lamp does not light. (Turntable
motor operates.)

Fan motor does not operate. (Oven
lamp lights.)
Turntable motor does not operate.
(Oven lamp lights.)
Oven or electrical parts does not
stop when cooking time is 0 or
STOP/CLEAR pad is pressed. 
Oven goes into cook cycle but shuts
down before end of cooking cycle.

Oven seems to be operating but little
or no heat is produced in oven load.

Oven does not operate properly
during variable cooking condition
except 100% cooking condition.
Function of COMPU DEFROST does
not operate properly. 
Top heaters do not operate.
Bottom heater does not operate.
Oven seems to be operating but
little or no heat is produced in oven
load. (Microwave power does not
seem to be generated properly.)
Top heaters do not operate.
Bottom heater does not operate.
Temperature is lower or higher than
preset.
Convection motor does not operate.
Oven stops after 4 minutes 15 sec..
OFF
CONDITION
COOKING
CONDITION
(COMMON MODE)
MICROWAVE 
COOKING
CONDITION
GRILL
COOKING
CONDITION
ROAST
COOKING
CONDITION
CONVECTION
COOKING
CONDITION