4-6
MAINTENANCE ORBAN MODEL 8685
H) Remove the power supply assembly.
14. Replacing the Power Supply Assembly:
A) Hold power supply board into main chassis, so that it aligns with the four
mounting holes on the top apron of the chassis.
B) Replace the four Phillips screws holding the power supply assembly to the top
apron of the chassis, but do not fully tighten them yet.
C) Replace but do not fully tighten the two Phillips screws that hold the IEC con-
nector.
D) Replace and fully tighten the three Phillips screws at the bottom edge of the
power supply
E) Fully tighten the four Phillips screws holding the power supply assembly to
the top apron of the chassis
F) Fully tighten the two Philips that hold the IEC connector.
G) Replace the two cable assemblies from the power transformer.
H) Replace the nut securing the green ground wire to the chassis.
I) Reattach the three ribbon cables to the power supply.
J) Reattach the two cable assemblies from the power transformer.
15. Replacing the I/O Board and DSP board:
Referring to steps 2 and 3, follow the instructions in reverse.
16. Replac
ing the Base Board.
Referring to step 12, follow the instructions in reverse.
Note that you cannot replace the Serial Port board,
Display Interface Board, and
the CPU board until you have replaced the base board.
17. Replacing the Display Interface Board.
Referring to step 11, follow the instructions in reverse.
• To avoid bent pins or other damage, verify that all connector pins are
aligned
before applying force.
• Verify that pin one of the ribbon cables (red stripe) is oriented correctly. Pin 1
is indicated by the number “1” or a square pad.
• Note that you cannot replace the CPU board until you have replaced the Base
Board and the display interface board.
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