Samsung FTQ387LWGX Service Manual page 60

4. Troubleshooting
4-2 Electrical Malfunction
FIGURE
Low Voltage Transformer Low Voltage Transformer
Door plunger switch Door plunger switch
Hot Surface & Surface Lamp Hot Surface & Surface Lamp
(Back Guard) (Back Guard)
Oven Sensor Oven Sensor
TESTS MEASURE
Measure resistance of Primary and
*
secondary coil.
Measure secondary voltage.
*
Make sure whether connector or wire
*
of low voltage transformer has been
damaged or not.
Check the state of working of switch.
*
Make sure whether wire, housing
*
and terminal is connected with switch
has been damaged or not.
Measure voltage which is supplied
*
with lamp terminal.
Check whether harness has been
*
loosen or disconnected.
Check whether the resistance values
*
of oven sensor is same with a chart s
one.
Check whether wire or housing has
*
been loosen or disconnected.
60
RESULTS
Approx
Primary coil(white) : 75 ~ 80
secondary coil :
Red : 1.8~2.2 , AC 13.5V
yellow: 0.8~1.2V, AC 8V
Replace or repair if wire of
*
connetor has been damaged.
Nomal open : 0
Nomal close :
Replace or repair if wire or
*
terminal has been damaged.
Approx.
Lamp voltage :120V
*
resistance :
*
Replace or repair if wire or
*
terminal has been damaged.
Approx.
at the room temperature :1080