IBM PROJECTOR C400 User Manual page 19

Figure 1-5. Rear view of projector
Note: This is a service port and is not intended for personal use.
Note: If your video equipment has both S-video and RCA (composite video) jacks, connect
to the S-video connector for optimal signal quality.
7 Keystone/Down cursor button
8 Volume/left cursor button
9 Auto button
10 Power button
11 Power LED
1 Local Area Network RJ-45
2 RS-232
3 Monitor out
4 DVI-I
5 Composite video
6 S-video
7 Audio-in
8 Audio-out
9 USB
Chapter 1. Product description
1-5