4-4
MAINTENANCE ORBAN MODEL 8685
7. Removing the Rotary Encoder Board.
Remove the four screws holding the board to the standoffs and lift the board
from the standoffs.
All of the knobs and buttons are friction-fit and can be removed, if necessary, by
pulling them off their shafts. However, to avoid possibly damaging the rotary
encoder, we advise not removing its knob unless necessary. Instead, to access the
screw partially blocked by the rotary encoder’s knob, use a small screwdriver and
attack the screw head from a slight angle, avoiding the edge of the knob to pre-
vent cosmetic damage.
The pushbutton switches, joystick, and rotary encoder are all soldered to this
board and can be replaced by normal solder rework techniques.
8. Removing the Color LCD Display and carrier board.
A) Make sure that AC power is disconnected from the 8685.
B) Remove the cable assembly from J14 on the base board.
C) Remove the 33-conductor flat ribbon cable from the display interface board
at J103:
a) Carefully disconnect the cable by rotating the black “wing” at the rear of
the connector 90° from horizontal to vertical.
b) Slide the cable out of the connector.
You may find it easier to first remove the display interface board from
the control module stack.
D) Remove the four screws that hold the display carrier board to the standoffs
on which it is mounted. Then lift the assembly off the standoffs.
9. Removing the Serial Port Connector Board:
A) If you have not done so yet, remove the top cover (step 1, above).
B) Using a 3/16-inch hex nut driver, remove the six hex nuts holding the serial
port connectors to the chassis.
C) Unplug the serial port interface assembly from the base board.
10. Removing the CPU Module.
A) The Display Board and CPU Board are a “sandwich” assembly. The CPU board
is located on top of the Display Board and is plugged into it.
B) Make sure that AC power is disconnected from the 8685.
C) Remove the RJ45 network cable from the control module
D) Remove the four Phillips screws from the control module.
E) Carefully unplug the module by pulling it evenly away from the display inter-
face board.
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