4-3-7 When the Up/Down Louver Motor Does Not Operate. (Initial Diagnosis) (Not displayed)
1. Checklist :
1) Is input voltage normal?
) Is the Up/Down louver motor properly connected with the connector (CN61)?
. Troubleshooting procedure
Yes
No
Yes
Yes
Driver IC05 (ULN003A) is faulty.
No
Micom (IC04) is faulty.
No
Normal
Yes
Check as in the procedure
No Power.
No
Does the operation lamp blink?
Unplug the power cord and
plug it after 30 seconds
Does operation
start when swing button
of the remote control unit
pushed?
Voltage at
pin #58~#61 of micom (IC04)
change?(Squarewave)
Voltage at
pin # ~ #5 of CN61(motor connector)
change?(Squarewave)
Up/Down louver motor is faulty.
4-3-8 When the remote control is not receiving
1. Check if the connector was normally assembled.
. Put the set in operation and check the voltage of No. 7(+) and No. 5(-) of the main PCB CN91 while operating the
remote control. When the voltage descends below 3V, the assembly module PCB is normal and the main PCB is poor.
Then replace the main PCB.
3. Replace the assembly display PCB because the module PCB is poor if the voltage between No. 7~5 of CN91
maintains 5V after the remote control starts operation.
4-10
Samsung Electronics
