No Power - Samsung SCX-1100 Service Manual

Troubleshooting
4-3-3 Defective Operation (LCD WINDOW
• Description Strange characters are displayed on the OPE Panel and buttons are not operated.
• Location 1.OPE ASS'Y
Check and Cause
1. Clear the memory.
2. Check if OPE HARNESS is connected to the Main
Board correctly.

4-3-4 No Power

• Description
While the power S/W is turned on, it does not work at all.
1.Power code
• Location
3.Power ASS'Y
Check and Cause
1. Check if the connection of power code is normal.
2. Check if DC +3.3V and +30V is supplied to POWER
ASS'Y from MAIN B'd.
3. Check if POWER DOWN KEY in OPE ASS'Y is
working regularly.
4-6
) Display
2.Connection between the Main B'D and OPE ASS'Y
2.Connection between the Main B'D and Power HARNESS
4.Main B'D. 5.OPE Ass'y
Solution
1. Try again after clearing the memory.
2. After confirming that OPE HARNESS is connected to
the Main Board correctly, if it is so, then replace the
OPE ASS'Y and Main Board in sequence.
Solution
1. Try to replace the power code.
2. If all the connections are correct, try to replace the
power ASS'Y and the Main B/D in sequence.
( +3.3V and +30V is supplied to POWER ASS'Y from
MAIN B'd)
3. Replace OPE ASS'Y
3.Main B'D.
Samsung Electronics