Samsung FTQ387LWGX Service Manual page 56

4. Troubleshooting
4-2 Electrical Malfunction
FIGURE
Door Lock Door Lock
Oven Lamp Socket Oven Lamp Socket
Convection Fan Convection Fan
Sub Fan(Upper) Sub Fan(Upper)
Sub Fan(Lower) Sub Fan(Lower)
TESTS MEASURE
Measure the state of micro switch
*
and motor after taking off harness
from the heater.
Check whether lock work normally
*
by pressing cooking time button and
delay start keypad at the same time
for 3 seconds.
First of all, make sure that lamp
*
lament is disconnected or not.
Measure resistance socket s terminal
*
after separating harness from heater
and removing lamp.
Measure the voltage of socket s
*
terminal after having lamp worked by
pressing oven light keypad.
Measure resistance value of Motor
*
terminal after taking off harness from
Motor.
Measure Voltage of Motor s terminal
*
after making oven work by pressing
bake keypad.
(Make sure that voltage has to be
measured for more than 1 minute
because Fan is supposed to on-off
Cycling work.)
56
RESULTS
Lock motor
*
Resistance : 1750 ~ 1850
(at the room temperature)
voltage : 120V
Micro switch
*
COM-NO
Replace or repair if harness has
*
been loosen or disconnected.
Approx :
*
Terminal voltage of lamp socket :
*
120V
Replace or repair harness.
*
Replace or repair sub PCB
*
Approx
Convection Fan : 20 ~ 30
*
Sub Fan : 85 ~ 100 *
*
(Upper, Lower)
Terminal Voltage of Convection
*
Fan and Sub Fan : 120V
Replace or repair harness
*
Replace or repair Sub PCB
*