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6. On the right side of the System Power Supply, at the input
power terminal block, mark and detach the three wires supplying
power to the arc lamp housing's squirrel cage blower. (Be sure to
label the three wires carefully so they can be reconnected
correctly.) Move that cable out of the way.
7. Back all CRTs into the CRT assembly by turning the focus rod
screws, at the rear of the CRT assembly (see Figure 6-4 in the
Series 300 Operator's Manual) all the way to the stops. Be careful
not to jam the focus rod screws by turning them too tightly into
their stops.
8. At the base of the electronics module remove the hex screw at
each corner (four screws).
9. Make sure that all control and input cables are disconnected
from the back of the card cage, then tilt the card cage back.
10. Remove the two hex screws in the base of the electronics
module under the card cage.
11. Tilt the card cage forward.
12. Remove the electronics module (two people) by grasping the
handles at the rear and the lip under the system power supply in
the front. When removing, be careful not to bump the CRT
cooling bellows (see Figure 4-8 in the Service Manual). The
bellows will not be covered under warranty if damaged in this
procedure! The easiest way to remove the module is to tip the
entire electronics module back until the System Power Supply
clears the arc lamp housing, then lift the module up and back.
13. Replace the module in the reverse order. When replacing the
module, make sure that the module base plate is tight against the
two front alignment pins and the one left-side alignment pin prior
to tightening the hex screws.
14. After the module is replaced, perform a CRT mechanical
focus adjustment, as shown in Section 6.8 of the Series 300
Operator's Manual.
Model 335 Supplement
12
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