page 4 – 2
220 / March 2000
C O N T R O L R O O M M O D U L E
Control Room Module
(CRD-220)
Module Overview
The CRD-220 module is the 220 console operator’s monitor module.
It allows him to listen to the console’s four stereo outputs (PGM, AUD,
AUX & UTL) as well as two external stereo line level inputs brought
directly into the module.
The CRD-220 also houses console HEADPHONE and CONTROL
ROOM circuits, which follow the source selection switches.
There are two types of headphone output: the +4dBu balanced output at the
module’s upper DB-25 connector (pre-level control), and the headphone jack
mounted on the bottom of the module, which is actually the output from a built-
in headphone amplifier. It is this built-in amp that is controlled by the module’s
front panel HEADPHONE level control.
The CUE master level control sets the level of the console’s cue signal.
Whenever CUE is activated elsewhere on the console (stereo line inputs, the
superphone module, or for studio talkback) its signal will appear at the
console’s built-in cue speaker mounted in the meterbridge. Depending on how
the CRD-220 module has been programmed, cue can also interrupt the control
room monitor speakers and/or the console operator’s headphone. The way Cue
interrupts the module’s headphone and CR outputs is determined by internal
PCB-mounted jumpers. See “Cue Interrupt” on next page.
All user wiring to and from the CRD-220 module takes place at
DB-25 multi-pin connectors mounted at the top of the module and located
underneath the hinged meterbridge. There are two connectors: the upper
one handles audio outputs and the console on-air tally control signals; the
lower accepts the two external source inputs. All audio connections are
stereo line level analog signals (+4dBu balanced). A pinout drawing on
page 4-5 shows all wiring connections at a glance.
10
9
8
7
6
4
3
2
1
0
5
HEADPHONE
10
9
8
7
6
4
3
2
1
0
5
CONTROL ROOM
HEADPHONES
10
9
8
7
6
4
3
2
1
0
5
CUE
CRD
P
G
M
A
U
D
U
T
L
A
U
X
E
X
T
1
E
X
T
2
S
E
L
E
C
T
I/O B
I/O A
W# 026004A