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4 : H
arness Assembly Aid connections to rig / fixture / board.
Fixture wiring involves wiring of I/O points, I/O LEDs and tray LEDs and pull
points.
For MSSL, Refer attached diagram for wiring of I/Os and LEDs
from 18 pole F connector.
Refer table folowing this section for detailed connector pin numbers.
4.1 : Wiring of 96 I/O points
, Three 37 pin D F connector are provided at the back
panel of tester. 37 pin D M connector marked “points” is used. Each wire is labeled
with corresponding point number. Each point number is connected to spring type
probe / pin on assembly fixture. See table for more details.
4.2 : Wiring of 96 I/O LEDs
, 4 nos. 50 pin centronics F connector are provided
at the back panel of tester. 50 pin centronics M connectors marked “I/O LEDs” are
used. Each LED requires 2 wires which are harnessed together. One wire marked
with “+5VDC” is connected to ANODE of LED and other marked with point number
is connected to CATHODE of LED of corresponding I/O point on fixture.