STEP
SEQUENCE
RESUL
T
a
∞
0
∞
274
Replace control
circuit board.
(7) PROBLEM
Unit oper
ation seems to be nor
mal
b
ut little or no heating is produced
for 'Con
v
ection Cooking'
Nor
mal control
circuit board
Replace con
v
ec.
motor
Resistance
incorrect
Nor
mal
Resistance
Replace ther
mal protector
for magnetron or ther
mal
protector f
or ca
vity or ther
mal
protector f
or con
v
ec.
Runs
Runs
Runs
Nor
mal control
circuit board
Replace control
circuit board.
(6) PROBLEM
Unit does not heat up e
v
en
if displa
y counts do
wn when
k
e
y
is touched f
o
r
"Con
v
ection Cooking"
a
Replace Heater
∞
52
Nor
mal
Resistance
.
0
∞
Resistance
Incorrect.
Runs
Runs
-14-
Chec
k resistance of
heater
.
Appro
ximately 46
Ω
measured o
v
er
both tubes
.
Nor
mal Heater
PROBLEM
3-b
Nor
mal
Oper
ation
Nor
mal con
v
ec.
Motor
Measure resistance
of con
v
ec.
motor
(Appro
x 300 ohms)
No
Oper
ation
Nor
mal ther
mal protector f
o
r
magnetron or ther
mal
protector f
or ca
vity or ther
mal
protector f
or con
v
ec..
Nor
mal
Oper
ation
T
empor
ar
ily
shor
t across
ter
minals of
ther
mal protector
for magnetron
or ther
mal
protector f
o
r
ca
vity or
ther
mal protector
for con
v
ec.
b
y
using jumper lead.
No
Oper
ation
Chec
k oper
ation
of con
v
ec.
motor
when ST
AR
T
k
e
y
is touched.
EM
-S350
