Samsung CL-21M21MQ Service Manual page 31

3-6-2 Adjusting the Screen Voltage
1. Select "Power Off → Mute → 1 → 8 → 2 → Power On" to enter Service Mode.
2. Initialize all settings to the values appropriate to the corresponding model.
3. Display the Toshiba pattern.
4. First check IBRM in "G2 Adjust" of Factory and adjust Screen VR until the color of IBRM item turns green.
Samsung Electronics
Alignment & Adjustment
Screen
VR
3-17