R-15AT
9
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 Procedure” section.
IMPORTANT: If the oven becomes inoperative because of a blown fuse F1 (F10A) in the 2nd. interlock switch SW2 -
monitor switch SW3 - relay RY3 circuit, check the 2nd. interlock switch SW2, monitor switch SW3 and
relay RY3 before replacing the fuse F1 (F10A).
TEST PROCEDURE
CONDITION
PROBLEM
POSSIBLE CASE
AND
DEFECTIVE PARTS
Home fuse or circuit
breaker blows when
power cord is plugged into
wall outlet.
Fuse F1 F10A blows when
power cord is plugged into
wall receptacle.
. does not appear
in display when power
cord is first plugged into
wall outlet.
Oven lamp does not light
when door is opened.
Oven lamp lights but fan
motor and antenna motor
do not operate.
Oven does not go into
cook cycle when START
pad is touched.
Oven seems to be
operating but little or no
heat is produced in oven
load. (Food incompletely
cooked or not cooked at
all at end of cook cycle.)
Oven goes into a cook
cycle but extremely
uneven heating is
produced in oven load
(food).
Oven does not cook prop-
erly when programmed for
Cooking Power 5 mode.
(Operates properly on
Cooking Power HI (HIGH)
mode.)
"EE9" Maximum time is
exceeded.
OFF
CONDITION
COOKING
CONDITION
ERROR MODE
MAGNETRON
HIGH VOLTAGE TRANSFORMER
H.V. RECTIFIER ASSEMBLY
HIGH VOLTAGE CAPACITOR
THERMAL CUT-OUT
2ND. INTERLOCK SWITCH
PRIMARY INTERLOCK RELAY
FUSE F1 F10A
HIGH VOLTAGE
FUSE
NOISE FILTER
TOUCH CONTROL PANEL
KEY UNIT
EXCEED MAX. HEATING TIME
RELAY (RY3)
RELAY (RY2)
FOIL PATTERN ON P.W.B.
LOW VOLTAGE
WRONG OPERATION
DIRTY OVEN CAVITY
MISADJUSTMENT SWITCH
SHORTED IN POWER CORD
OVEN LAMP OR SOCKET
COOLING FAN MOTOR
ANTENNA MOTOR
SHORT OR OPENED WIRING
MONITOR SWITCH
CONTROL SWITCH
A B C
D
E
E
E
F
G H
I
I
J K
L
M M
N CK RE RE RE CK CK CK CK
