R380L(W)
7 – 1
R380L(W)
Service Manual
CHAPTER 7.
TROUBLESHOOTING GUIDE
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 Pro-
cedure”section.
IMPORTANT:
If the oven becomes inoperative because of a blown fuse F10A in the
1st. latch switch - 2nd. interlock relay - monitor switch circuit, check the
1st. latch switch, 2nd.interlock relay and monitor switch before replac-
ing the fuse F10A.
MAGNETRON
POWER
TRANSFORMER
H.V.
RECTIFIER
ASSEMBLY
HIGH
VOLTAGE
CAPACITOR
1ST.
LATCH
SWITCH
2ND.
INTERLOCK
RELAY
CONTROL
SWITCH
MONITOR
SWITCH
TEMPERATURE
FUSE
(OVEN)
FAN
MOTOR
TURNTABLE
MOTOR
FUSE
F10A
TOUCH
CONTROL
PANEL
KEY
UNIT
RELAY
(RY-1,
RY-2)
FOIL
PATERN
O
N
P.W.B.
POWER
SUPPLY
CORD
SHORTED
WIRE
HARNESS
OPENED
WIRE
HARNESS
OVEN
LAMP
WALL
OUTLET
MISADJUSTMENT
SWITCH
HOME
FUSE
O
R
BREAKER
BLOCKED
COOLING
FAN
BLOCKED
VENTILATION
NOISE
FILTER
HIGH
VOLTAGE
FUSE
AH
SENSOR
TEST PROCEDURE
CK = Check / RE = Replace
A B C D E
E
E F G G H K L M N
RE CK CK RE CK CK CK CK CK
I J O
CONDITION
PROBLEM
POSSIBLE CAUSE
AND
DEFECTIVE PARTS
ON
SENSO
RCOOKING
CONDITION
CONDITION
OFF
CONDITION
Home fuse blows when power
supply cord is plugged into wall
outlet.
FUSE F10A blows when power
supply cord is plugged into wall
outlet.
Display does not show anything
when power supply cord is plug-
ged into wall outlet.
Display does not operate proper-
ly when STOP/CLEAR pad is
touched.
Oven lamp does not light at door
opened. (Display appears.)
Oven lamp does not light (Dis-
play appears.)
Fan motor does not operate.
(Display appears.)
Turntable motor assembly does
not operate. (Display appears.)
Oven does not start when the
START pad is touched.
(Dis-
play appears)
Oven or any electrical parts does
not stop when cooking time is 0
or STOP/CLEAR pad is touched.
Oven goes into cook cycle but
shuts down before end of cook-
ing cycle.
Oven stops at 16 sec. after starting.
AH sensor does not end during
Sensor cooking condition. (Oven
doesnot shut off after a cup of wa-
ter is boiling by sensor cooking.)
Oven seems to be operating but
little or no heat is produced in
oven load. (Microwave power lev-
el is set at 100%)
Oven does not seems to be oper-
ating properly when 70%, 50%,
30% or 10% is set. (Oven oper-
ates properly at 100% and then
the STOP/CLEAR pad is touched
the oven stops.)
