JLCooper MLA-1 - Manual (Page 7)

MLA-1 / MLA-10
Installation/Operations Manual
J1 Connector
Pin Name Pin Name
1 Chan 1 Out (-) 13 Chan 3 In (-)
2 Chan 1 Out (+) 14 Chan 3 In (+)
3 Chan 2 Out (-) 15 Chan 4 In (-)
4 Chan 2 Out (+) 16 Chan 4 In (+)
5 Chan 3 Out (-) 17 Ground
6 Chan 3 Out (+) 18 Ground
7 Chan 4 Out (-) 19 Ground
8 Chan 4 Out (+) 20 Ground
9 Chan 1 In (-) 21 +9 VDC
10 Chan 1 In (+) 22 +9 VDC
11 Chan 2 In (-) 23 +9 VDC
12 Chan 2 In (+) 24 +9 VDC
(Note that some units are silk-screened to have pins 9 thru 16 as channels 5 thru
8. The wiring is the same regardless.)
J2
This connector carries the actual MIDI signals, and must usually be brought to
normal 5 pin DIN connectors. Normally, these would be mounted to a wall plate.
Any type of wire may be used for these connections. The wiring is as follows:
J2 Pin MIDI Connector J2 Pin MIDI Connector
1 MIDI Out 1, pin 4 13 MIDI In 1, pin 4
2 MIDI Out 1, pin 2 14 No Connection
3 MIDI Out 1, pin 5 15 MIDI In 1, pin 5
4 MIDI Out 2, pin 4 16 MIDI In 2, pin 4
5 MIDI Out 2, pin 2 17 No Connection
6 MIDI Out 2, pin 5 18 MIDI In 2, pin 5
7 MIDI Out 3, pin 4 19 MIDI In 3, pin 4
8 MIDI Out 3, pin 2 20 No Connection
9 MIDI Out 3, pin 5 21 MIDI In 3, pin 5
10 MIDI Out 4, pin 4 22 MIDI In 4, pin 4
11 MIDI Out 4, pin 2 23 No Connection
12 MIDI Out 4, pin 5 24 MIDI In 4, pin 5
(Note that some MLA-1 metal work was silk-screened with MIDI Ins designated
as channels 5 thru 8. The wiring is the same regardless.)
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