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Troubleshooting
4-3 Defective Operation
PROBLEM
Operation panel does
not operate.
LF motor does not
operate
SCAN motor does not
operate
4-6
ITEMS TO BE CHECKED
• Check the power switch.
• Check the power supply.
• Check the driver IC defect.
• Check the download mode.
• Check the harness contact.
• Check 7-segment LED.
• Check the key contacts.
• Otherwise
• Check the harness contact.
• Check the control signals of U44-139-144
in Main PBA.
• Check the motor signals of U2-1, 19 and
U3-1, 19 in Driver PBA.
• Check the harness contact.
• Check the control signals of U12-112-119
in Main PBA.
• Check the motor signals of U9-1, 19 and
U10-1, 19 in Driver PBA.
HOW TO SOLVE
• Check the switch operation.
- If the switch on, U12-96 = 5V
If the switch is defect, replace it.
• Check the fuse. If the fuse is defected, replace it
with 250V/3A.
• Check the output voltage in power alone.
- CON1-1 = 5V +5%
- CON1-2 = GND 5V
- CON1-3 = 12V +2%
- CON1-4 = GND 12V
- CON1-5 = GND 30V
- CON1-6 = 30V +5%
• The following driver ICs defect can cause power
down. Remove a IC and check the power on.
- U37, U39, U25, and U26 in Main PBA
- U2, U3, U4, U9, and U10 in Driver PBA
• Download the firmware of recent version, and
check the system initial.
• Check CN10 and CN14 contact in Main PBA
whether each connection is tight.
• Replace the part or OPE PBA.
• Check the mechanical defect, and replace the
front cover.
• Replace the Main PBA.
• Check CN5 contact in Main PBA, CN2 contact in
Driver PBA, and CN5, 8 in Driver PBA whether
each connection is tight.
• If these CMOS signals are defective when the
other functions normal, replace the Main PBA.
• If these 30V signals are defective when the other
functions normal, replace the Driver PBA.
• Check CN5 contact in Main PBA, CN2 contact in
Driver PBA, and CN5, 7 in Driver PBA whether
each connection in tight.
• If these CMOS signals are defective when the
other functions normal, replace the Main PBA.
• If these 30V signals are defective when the other
functions normal, replace the Driver PBA.
Samsung Electronics
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