1. Verify the clock reference in the session setup e.g., if you're feeding the USD Black Burst, clock reference should = Vid Ref. If it is set to the wrong reference e.g., LTC, the USD cannot resolve.
Here are some important Session Setup settings to verify when trouble-shooting sync:
- Clock Reference
- Positional Reference
- Sync Mode
- Frame Rate
- Sample Rate

2. This can also happen if the USD mistakenly switches itself to PAL mode instead of NTSC.
Here are the steps to check and adjust frame rate.
- turn computer OFF
- press SET
- Use up/down until you see “VIDEO SYS”
- press SET
- screen will says either NTSC or PAL, use up/down to adjust
- press SET twice to return to main menu.

3. If you continue to have the same symptoms, try the factory reset.
- turn the USD off for at least 10 seconds.
- press and hold UP and DOWN while turning the power back on.
- keep holding up & down until you see FAC-CFG on the screen.