Tektronix TAS 465, Руководство по обслуживанию

Страница: 140 / 268

6Ć32
The procedures that follow describe how to remove and install the CRT.
Refer to Figure 6Ć20 for this procedure.
Ċ This procedure requires that the
following procedures be performed first:
H Rear Cover Removal
H Cabinet Removal
H Front Trim Removal
H A3 Display Driver Board
1. Set the oscilloscope so its bottom is down on the work surface, with its
front facing you.
WARNING
Breaking a CRT causes it to implode, scattering glass fragments
with high velocity and possibly injuring you. Wear protective
clothing and safety glasses (preferably a fullĆface shield). Avoiding
striking the CRT with or against any object.
Store the CRT with itsdisplay face down in a protected location,
placing it on a soft, nonabrasive surface to prevent scratching the
face plate.
2. Unplug the the 2Ćwide red/black cable from the A2 Display Control
board.
WARNING
HighĆvoltage ispresent on the anode lead. Do not touch the end of
the anode lead until it hasbeen fully discharged to ground.
3. Disconnect the red CRT anode lead from the A63 Power Supply module
and immediately discharge to chassis ground.
4. Using a
5
@
16
inch nut driver, remove the nut securing the ground wire at
the rear of the CRT.
5. From the bottom of the chassis, unsnap the Rear CRT Bracket from the
chassis. See Figure 6Ć19.