4-2
MAINTENANCE ORBAN MODEL 8685
Subassembly Removal and Replacement
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 8685 and remove it from the rack.
Be sure power is disconnected before removing the cover.
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.
This applies to both the base I/O assembly (AES3id I/O only) and to the optional
HD-SDI I/O assembly.
A) Make sure that AC power is disconnected from the 8685.
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 8685.
B) If you have not done so yet, remove the top cover (step 1 on page 4-2).
C) Disconnect the ribbon cable from J901 on the DSP board.
D) Disconnect the ribbon cable from J601 on the DSP board.
E) At J602 and J603 on the Input/Output assembly, disconnect the two ribbon
cables soldered to J701 and J702 of the DSP board.
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