7-24
(TROUBLE 4) Oven seems to be operating but little heat is produced in oven load.
NOTE : Simple test of power output-conducted by heating one liter water for one min. if available.
Minimum 8.5°C temperature rise is normal condition.
CONDITION
CHECK
RESULT
CAUSE
REMEDY
Output is low
Lower than 90% of
rating voltage.
Normal
Defective
Magnetron.
Replace
Magnetron.
Decrease in power
source voltage
with load.
Suggest customer
contact local
electric power
utility co. or
qualified
electrician.
Check the
power source
voltage.
CONDITION
CHECK
RESULT
CAUSE
REMEDY
4. The display
shows F-4.
Abnormal
Normal
Loose connection.
Connect them
tightly.
Check the
connection between
sensor wire and
control PCB.
Abnormal
Normal
Defective sensor.
Replace sensor.
Check the sensor.
Defective Control
PCB assembly.
Replace PCB
assembly.
Summary of Contents for 721. 63762
Page 9: ...5 1 SCHEMATIC DIAGRAM OVERALL CIRCUIT DIAGRAM...
Page 10: ...5 2 MATRIX CIRCUIT FOR TOUCH KEY BOARD...
Page 37: ...8 2 CONTROLLER PARTS I 1001 W171 W171 2016 2009 2007 2017 EV...
Page 38: ...2004 2008 2002 2006 W106 2381 8 3 CONTROLLER PARTS II EV...
Page 40: ...8 5 LATCH BOARD PARTS 4000 W102 4001 4002 4003 4002 4004 EV...
Page 44: ...8 21 SCHEMATIC DIAGRAM OF P C B...
Page 45: ...8 22 PRINTED CIRCUIT BOARD...
