Read Sharp R-249 Service Manual online
R-249(SL)
R-249(W)
6
When troubleshooting the microwave oven, it is helpful to follow the Sequence of Operation in performing the checks.
Many of the possible causes of trouble will require that a specific test be performed. These tests are given a
procedure letter which will be found in the "Test Procedure"section.
IMPORTANT: If the oven becomes inoperative because of a blown fuse T6.3A in the 1st. latch switch - 2nd. interlock
Many of the possible causes of trouble will require that a specific test be performed. These tests are given a
procedure letter which will be found in the "Test Procedure"section.
IMPORTANT: If the oven becomes inoperative because of a blown fuse T6.3A in the 1st. latch switch - 2nd. interlock
relay - monitor switch circuit, check the 1st. latch switch, 2nd. interlock relay control switch, 2nd. interlock
relay and monitor switch before replacing the fuse T6.3A.
relay and monitor switch before replacing the fuse T6.3A.
TROUBLESHOOTING GUIDE
CK = Check / RE = Replace
MAGNETRON
HIGH VOLTAGE TRANSFORMER
HIGH VOLTAGE RECTIFIER ASSEMBLY
HIGH VOLTAGE WIRE
HIGH VOLTAGE CAPACITOR
1ST. LATCH SWITCH
2ND
. INTERLOCK RELAY CONTROL
SWITCH
MONITOR SWITCH
TEMPERATURE FUSE (OVEN)
FAN MOTOR
TURNTABLE MOTOR
FUSE T6.3A
TOUCH CONTROL PANEL
RELAY (RY-1, RY-2)
FOIL PATERN ON P.W.B.
POWER SUPPLY CORD
SHORTED WIRE HARNESS
OPENED WIRE HARNESS
OVEN LAMP
WALL OUTLET
MISADJUSTMENT SWITCH
HOME FUSE OR BREAKER
BLOCKED COOLING FAN
BLOCKED VENTILATION
NOISE FILTER
KEY UNIT (MEMBRANE SWITCH)
H.V. FUSE
SURGE RELAY
Home fuse blows when power
supply cord is plugged into wall
outlet.
supply cord is plugged into wall
outlet.
FUSE T6.3A blows when power
supply cord is plugged into wall
outlet.
supply cord is plugged into wall
outlet.
"88:88" does not appear in dis-
play but power supply cord is
plugged into wall outlet.
play but power supply cord is
plugged into wall outlet.
Display does not operate prop-
erly when STOP/CLEAR key is
touched.
erly when STOP/CLEAR key is
touched.
Oven does not start when the
START key is touched. (Dis-
play appears)
START key is touched. (Dis-
play appears)
Oven lamp does not light (Dis-
play appears.)
play appears.)
Fan motor does not operate.
(Display appears.)
(Display appears.)
Turntable motor does not oper-
ate. (Display appears.)
ate. (Display appears.)
Oven or any electrical parts
does not stop when cooking
time is 0 or STOP/CLEAR key
is touched.
does not stop when cooking
time is 0 or STOP/CLEAR key
is touched.
Oven seems to be operating
but little or no heat is produced
in oven load. (Microwave power
level is set at 100%)
but little or no heat is produced
in oven load. (Microwave power
level is set at 100%)
Oven does not seems to be
operating properly when 70%,
50%, 30% or 10% is set.
operating properly when 70%,
50%, 30% or 10% is set.
Oven goes into cook cycle but
shuts down before end of cook-
ing cycle.
shuts down before end of cook-
ing cycle.
OFF
CONDITION
CONDITION
PROBLEM
CONDITION
POSSIBLE CAUSE
AND
DEFECTIVE PARTS
TEST PROCEDURE
ON
CONDITION
CONDITION
A B C
CK
D E E E F G G H K M N
RE CKCKRECK CKCKCKCK
I L J
CK
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