STEP
SEQUENCE
RESUL
T
a
∞
0
∞
274
Replace control
circuit board.
(7) PROBLEM
Unit operation seems to be normal
but little or no heating is produced
for 'Convection Cooking'
Normal control
circuit board
Replace convec.
motor
Resistance
incorrect
Normal
Resistance
Replace thermal protector
for magnetron or thermal
protector for cavity or thermal
protector for convec.
Runs
Runs
Runs
Normal control
circuit board
Replace control
circuit board.
(6) PROBLEM
Unit does not heat up even
if display counts down when
key is touched for
"Convection Cooking"
a
Replace Heater
∞
52
Normal
Resistance.
0
∞
Resistance
Incorrect.
Runs
Runs
-14-
Check resistance of
heater
.
Approximately 51.6
Ω
measured over
both tubes.
Normal Heater
PROBLEM
3-b
Normal
Operation
Normal convec.
Motor
Measure resistance
of convec. motor
(Approx 274 ohms)
No
Operation
Normal thermal protector for
magnetron or thermal
protector for cavity or thermal
protector for convec..
Normal
Operation
T
emporarily
short across
terminals of
thermal protector
for magnetron
or thermal
protector for
cavity or
thermal protector
for convec. by
using jumper lead.
No
Operation
Check operation
of convec. motor
when ST
AR
T
key
is touched.
EM-S350
