Service manual

Console Logic
The DB-15 connector on the rear panel of the console has the logic & audio
signals required for supporting a talk studio and controlling the starting &
stopping of sources.
8 7 6 5 4 3 2 1
15 14 13 12 11 10 9
DB15 CONNECTOR PINOUT (Solder Cup)
CONSOLE BACK PANEL VIEW
PIN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
DESCRIPTION
Control Room Mute Logic (will switch to Pin 13 ground)
Autocue Logic In (switch to ground to turn on)
Channel Eight Logic (+12VDC channel on, 0VDC channel off)
Channel Seven Logic (+12VDC channel on, 0VDC channel off)
Channel Six Logic (+12VDC channel on, 0VDC channel off)
Channel Five Logic (+12VDC channel on, 0VDC channel off)
Channel Four Logic (+12VDC channel on, 0VDC channel off)
Channel 3 Logic (+12VDC channel on, 0VDC channel off)
Channel 10 Logic (+12VDC channel on, 0VDC channel off)
Studio Monitor Left Audio Output
Studio Monitor Right Audio Output
Talkback audio from Mic 1 and Mic 2
Ground
+ 12 VDC
Talkback Audio Input to Cue
IMPORTANT- improper connection to console logic can damage the console.
+12V
22.1k
2N3904
+12V
ON
OFF
ON/OFF
TALLY
LED
475
475
1k
a) Remote Channel On-off w Tally
Channel
Logic
Channel Logic
Channel 3,4,5,6,7,8, & 10 feature channel logic for use in talk studios or starting and stop-
ping source devices. The logic requires an interface circuit to be built by a qualified broad-
cast technician.
The circuit shown at the right will remotely turn a
console channel on and off and drive a tally lamp to
display the On-off satus.
22K
+
22K
47K
2N3904
10uF
1N914
+12V
START
Channel
Logic
b) Source Start-stop Circuit
The circuit shown at the right will close the relay for
~ 0.5 seconds to start & stop an audio source device
such as a CD player.
22K
+
22K
47K
2N3904
10uF
1N914
+12V
STOP
22K
2N3904
+12V
1K
1.31