OPTIMOD MAINTENANCE
4-5
11. Removing the Display interface Board.
You must first remove the CPU Module before removing the Display Interface
Board.
A) Unscrew the four standoffs that had supported the CPU board before it was
removed.
B) Carefully pull the Display Interface Board evenly away from the Base Board,
being careful not to stress any ribbon cables still connected to it.
C) Unplug any ribbon cables from the Display Interface Board, which now can be
removed completely. Refer to step (8.C)to disconnect the 33-conductor ribbon
cable to J103.
12. Removing the Bas
e Board.
You must have completed steps 9, 10, and 11 first.
A) Make sure that AC power is disconnected from the 8685.
B) Remove
the three power ribbon cables from the power supply and dress them
away from the Base Board.
C) Using a 3/16-inch nut driver, remove the two jackscrews and lock washers
holding the DB25 connector to the rear panel.
D) Remove the four Phillips screws and four standoffs holding the Base Board to
the bottom of the chassis.
E) Verify that all connectors have been removed.
F) Remove the Base Board.
13. Removing the Power Supply assembly [needs revision].
To remove the power supply it is necessary to remove the 8685 from the rack and
to remove the top cover. It is most convenient to remove the Power Supply As-
sembly if the Base Board, RS-232 Board, CPU Module, and Display Interface Mod-
ule have been removed.
A) Be sure that the AC line cord is disconnected from the power supply.
B) Unplug the three ribbon cables from the power supply.
C) Unplug the two cable assemblies from the power transformer by squeezing
the locking tab and removing the connector.
D) Remove the nut securing the green ground wire to the chassis.
E) Remove the two Phillips screws securing the mains input connector to the rear
of the chassis
F) Remove the three Phillips screws at the bottom edge of the power supply
G) Remove the four Phillips screws holding the power supply assembly to the top
apron of the chassis.
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