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DIDS-402- 2MI 0
Para 4-2/.4-2. 4d
4-2 REMOVAL AND REPLACEMENT OF PARTS
Removal and replacement of most components in the DIDS-400 System is
simple. enough to obviate detailed instructions.
A few procedures are given,
however, to facilitate the repairman's task.
Unless otherwise instructed,
replacement procedures are the reverse of removal.
4-2. I Removal of Cover. Remove the two screws at the front and one at the
rear that fasten the ·cover to the chassis.
Remove the cover.
4-2.2 Removal of Keyboard Assembly All.
Remove the four screws located on
the underside of the keyboard chassis.
Lift the keyboard assembly away from
chassis, and disconnect the plug located inside chassis.
4-2.3 Removal and Replacement of Monoscope Preamplifier A7
a.
Disconnect the leads from all terminals on the monoscope pre-
amplifier.
Remove the screws that fasten the circuit board to
the chassis.
Be sure to retain the spacers.
CAUTION
Pull the board out slowly to prevent breaking
the lead connected to the tip of the monos cope
tube.
b.
Remove the lead.
4-2.4 Removal and Replacement of Circuit Boards
a.
Disconnect leads from all terminals.
b.
Remove all screws and washers that fasten the circuit board to the
chassis.
c.
To replace, fasten the circuit board to the chassis.
d.
Refer to the illustration of the specific board being removed to
determine the lead that fastens to each tenninal as follows:
Horizontal and Vertical Deflection Amplifier A2
Monoscope XY Deflection Amplifier A3
Monoscope Preamplifier A7
Video Amplifie r A8
Figure 2-5
Figure 2-7
Figure 2-8
Figure 2-6
4-23
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