Samsung ML-1640 - Page 86

Service Manual
Alignment & Troubleshooting
4-36
Samsung Electronics
9) Vertical Line Getting Curved
1. If the supply of +24v
is unstable in the Main Control board
linking with LSU, check drive by
DCU Mode : LSU Check -05-
LSU Motor on.
1. Replace LSU.
2. Replace the Main Control board.
• Description When printing, vertical line gets curved.