Repair manual

PARTS REPLACEMENT
4-27
J. REPLACING THE LOGIC BOARD ASSEMBLY
Note: Logic Board Replacement is to be done only at depot facilities.
1. SPECIAL EQUIPMENT NEEDED:
Digital Palette Gentest Diskette
Host Computer
Video Photometer
Oscilloscope
K42769 Edmonds Scientific 6X Loupe
12979 Final Assembly Alignment Gauge
12991 CRT Collimation Master
12992 CRT Collimator
1-150 Light Source
C-1300 Null Meter
12993 Camera Back Collimator
12988 35mm Collimation Adapter
12996 35mm Fiber Optics Locator Assembly
12995 35mm Adapter Collimation Master
12974 35mm Lens Adjust Wrench
12994 108 Adapter Collimation Master
12974 108 Lens Adjust Wrench
2. REMOVAL: (Figure 4-10)
a. Disconnect AC power from the system.
b. Remove the six screws and washers holding the Cover to the bottom
chassis (Figure 4-2). Slide the Cover to the rear and off the chassis.
c. Remove the Monitor Board Assembly as described in paragraph H
(Figure 4-8).
d. Remove the Power Supply Board Assembly as described in paragraph I
(Figure 4-9)
e. Unplug all eight connectors from the Logic Board.
f. Disconnect the green ground wire which is secured to the chassis with a #
# 8 hex nut and bolt (inset, figure 4-10).
g. Remove the six screws holding the back plate to the chassis, then remove
the back plate.