Samsung ML-2250/XBG Service Manual page 90

7.3.10 Printed Vertical Lines become curved
• Description
When printing, vertical lines are not straight.
Check and Cause
Use EDC diagnostic code 05 to test the LSU motor.
1. Check stability of 24V supply to LSU.
Samsung Electronics
Solution
1. 24V stable - Replace LSU. 24V unstable replace
SMPS, if the problem persists replace the main
PBA.
Troubleshooting
Service Manual
7-17