Service manual

OPTO–ISOLATED READER INPUTS
Location: Rear of Relay Control Unit
Mating connector required: 37–way D type male
OPTO–ISOLATED READER INPUTS : ‘OPTO INPUT 1–16’
Notes :
+5v MUST be connected via 470 ohm resistor to limit current into opto inputs to 10mA.
Rec Tally MUST be connected via a series 2.7k ohm resistor to limit current into opto inputs.
Record & Play Tallies for Multitrack shown below are Active Low.
To make Multitrack Rec & Play Tallies High, connect Relay Pin #1 via a 470 ohm resistor to
the +5V (Record) line, and connect Relay Pin #20 to +0v without any resistor.
‘OPTO–INPUT 1–16’
PIN PIN
INPUT 1
120
INPUT 2
221
INPUT 3
322
INPUT 4
423
INPUT 5
524
INPUT 6
625
INPUT 7
726
INPUT 8
827
INPUT 9
928
INPUT 10
10 29
INPUT 11
11 30
INPUT 12
12 31
INPUT 13
13 32
INPUT 14
14 33
INPUT 15
15 34
INPUT 16
16 35
Digital Service Manual
Issue 3 Page 52