Orban OPTIMOD-FM 8700, Operating Manual

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4-2
MAINTENANCE ORBAN MODEL 8700i
Subassembly Removal and Reinstallation
See page 6-37 for the Circuit Board Locator and Basic Interconnections diagram.
1. Removing the Top Cover.
To access the main boards, power supply board or display assembly, you must
remove the top cover.
A) Disconnect the 8700i and remove it from the rack.
Be sure power is disconnected before removing the cover.
h
Hazardous voltage is exposed when the unit is open and the power is ON.
B) Set the unit upright on a padded surface with the front panel facing you.
C) Remove seventeen thread-forming screws and five machine screws holding
the top cover in place and lift the top cover off.
Use a #1 Phillips screwdriver.
2. Removing the Input/Output Assembly.
A) Make sure that AC power is disconnected from the 8700i.
B) Remove the 14-conductor ribbon cable from the base board at JP600.
C) Remove the two 40-conductor ribbon cables from the DSP board at J602 and
J603.
D) Remove the power cable at J601.
E) Remove the three Phillips screws holding the rear of the Input/Output assem-
bly to the floor of the chassis.
F) Remove the ten Phillips screws holding the input/output assembly to the rear
panel.
G) Remove the Input/Output assembly.
3. Removing the DSP Board.
A) Make sure that AC power is disconnected from the 8700i.
B) If you have not done so yet, remove the top cover (step 1 on page 4-2).
C) Disconnect the ribbon cable from J504.
D) Disconnect the two ribbon cables from the DSP board to J602 and J603 on the
Input/Output assembly
E) Remove the ribbon cable from J701 on the DSP board
F) Remove the cable assembly from J200 of the DSP board.