Sound Devices 633 Playback problem

[raymondloyd]

Hello,

I just purchased an SD 633, and it's my first time using this model. Unfortunately, the playback isn’t working. When I press play, there’s complete silence in my headphones. I set the playback output to headphone only, but it still doesn’t work. I checked the manual, but couldn’t find any helpful information. Could you please assist me?

[Conor]

Restore the factory default settings and try again

[syncsound]

On 11/11/2025 at 8:47 PM, raymondloyd said:

Hello,

I just purchased an SD 633, and it's my first time using this model. Unfortunately, the playback isn’t working. When I press play, there’s complete silence in my headphones. I set the playback output to headphone only, but it still doesn’t work. I checked the manual, but couldn’t find any helpful information. Could you please assist me?

Did you resolve this issue? If not, can you play the files back off the card on a computer?

[Olle Sjostrom]

Iirc, but I might be wrong cus it’s been a WHILE, the monitor channels don’t actually reflect the real channels, ie if you recorded an LR mix, if you’re listening to LR you’re actually not listening to anything since the recorded order is now track 1,2 etc.. , you need to change the monitor to some other mode, but again I might be wrong .. that could be the 7 series mode actually

 

just quickly reading the manual should give you an indication on screen where the sound is actually playing, but you’re saying the meters are moving but there’s no sound?

[LDstudios]

Does your headphone selection match your record armed tracks? If ISOs are record armed, but the LR mix track isn’t, nothing will playback with an LR headphone selection. 
 

I’ve made that mistake before! 

[Olle Sjostrom]

This was what I meant...

[Mungo]

During playback the routing is out of function, all tracks are just played back, either with signal or with nothing.

E.g. if you usually have routed LR to X1X2 and listen to X1X2 during recording, you won't get a signal during playback except you have had X1X2 armed and recorded before.

[axel]

ey man, people are trying to help you, say something!

[samrodgers]

If it’s not some funny situation where playback isn’t going to your headphones it may be a little bug?

 

I’ll say once a year I have this problem. Or the track won’t show up after recording. I have a mini heart attack. Then select cf for playback and it’s there. 
 

idk why but it’s maybe happened to me 2 or 3 times in the 8 years I’ve had my 633. 
 

I wonder if it’s bad card.