Samsung SCX-4200 Series - Page 100

Troubleshooting
Samsung Electronics
Service Manual
6-19
6.4.10 Printed Vertical Lines become curved
• Description
When printing, vertical lines are not straight.
Check and Cause Solution
1. Check stability of 24V supply to LSU. 1. 24V stable - Replace LSU.
24V unstable replace SMPS, if the problem persists
replace the main PBA.