Philips CCS 800 Service Manual page 48

12.7 Block diagram chairman unit
LBB3331/x0 Chairman Unit CCS800
Trunk in
Audio distribution
Audio contribution
Control 2
Control 1
Supply Positive
Supply negative
Ground
LBB 3310/00, 3330/00 and 3331/00
4822 861 11006
Volume
Mic. gain
preset
Mic. return
preset
3
1
5
4
6
DC
7
DC
2
headphone
Chime
Chime enable
preset
Logic
Mic. on
15V
5V
Priority Mic. on
0V
page: 45
SERVICE MANUAL
Headphone 1
Headphone 2
Trunk out
3
Audio distribution
1
Audio
5
contribution
4
Control 2
6
Control 1
7
Supply positive
2
Supply negative
Ground
Date of issue:
July 1998