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Chapter 4—Maintenance
4-16
Model 330. 340SC, 370SC Service Manual
module. This is not absolutely necessary and it is up to the technician’s
discretion whether or not to remove it (Section 4.5).
3.
After removing the System Power Supply, remove the system power
supply mounting plate that covers the top front area of the CRT Assembly.
4.
Run the CRT all the way forward using the Z axis focus rod at the rear of
the CRT assembly (Photo 4-6).
5.
Remove the video amplifier board from the CRT Assembly (Section 4.8).
6.
Inside the CRT housing, remove the cable clamp(s) from the CRT anode
cable.
7.
Inside the CRT housing on the left side, disconnect the CRT anode cable
from the bulkhead connector. Ensure the entire anode cable is free.
8.
Loosen the yoke clamp and ensure the yoke is loose on the CRT neck.
9.
Remove six (6) mounting screws at the face of the CRT.
10.
Gently remove the CRT by sliding it forward out of the yoke and CRT
housing.
11.
Replace the CRT in the reverse order.
12.
Perform a CRT mechanical focus adjustment, yoke alignment, horizontal
width adjustment, vertical size adjustment, and linearity adjustment after
replacing the CRT (refer to the appropriate model Operator’s Manual).
Notes on replacing a Model 330 CRT:
Orient the bellows on the front of the CRT to the top side.
Remove the plastic coating from the tube screen only after the
CRT has been installed.
Tighten all CRT mounting screws in a diagonal pattern.