Sharp R-4A68, Service Manual

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R-4A68
7
MAGNETRON POWER TRANSFORMER H.V. RECTIFIER ASSEMBLY HIGH VOLTAGE CAPACITOR 1ST. LATCH SWITCH 2ND. INTERLOCK RELAY CONTROL SWITCH MONITOR SWITCH MONITOR RESISTOR TEMPERATURE FUSE THERMAL CUT-OUT FAN MOTOR TURNTABLE MOTOR FUSE M8A TOUCH CONTROL PANEL RELAY (RY-1, RY-2) FOIL PATTERN ON P.W.B. POWER SUPPLY CORD OVEN LAMP OR SOCKET HIGH OLTAGE WIRE SHORTED WIRE HARNESS OPENED WIRE HARNESS WALL OUTLET HOME FUSE OR BREAKER WRONG OPERATION MISADJUSTMENT SWITCH BLOCKED COOLING FAN BLOCKED VENTILATION OPENING
Home fuse blows when power
supply cord is plugged into wall
outlet.
FUSE M8A blows when power
supply cord is plugged into wall
outlet.
Display does not show anything
when power supply cord is
plugged into wall outlet.
Display does not operate prop-
erly when STOP / CLEAR pad is
touched.
Oven lamp does not light at door
opened. (Display appears.)
Oven does not start when the
START pad is touched. (Display
appears)
Oven lamp does not light (Dis-
play appears.)
Fan motor does not operate. (Dis-
play appears.)
Turntable motor assembly does
not operate. (Display appears.)
Oven or any electrical parts does
not stop when cooking time is 0 or
TOP / CLEAR pad is touched.
Oven seems to be operating but
little or no heat is produced in
oven load. (Microwave power
level is set at HIGH)
Oven does not seems to be oper-
ating properly when MEDIUM
HIGH, MEDIUM, MEDIUM LOW
or LOW is set. (Oven operates
properly at HIGH and when the
TOP / CLEAR pad is touched the
oven stops.)
Oven goes into cook cycle but
shuts down before end of cook-
ing cycle.
OFF
CONDITION
TEST PROCEDURE
ON
CONDITION
CK = Check / RE = Replace
A B C D E E E F G G H H I J L M
RE RE CKCK CK CK CK CK CK CK CK
PROBLEM
CONDITION
POSSIBLE CAUSE
AND
DEFECTIVE PARTS