Atec Tektronix-1502 - Manual (Page 72)

TM 9-4935-601-14-3&P
3. Do not install Main Circuit Board holding screws at this point.
24. Install cam switch Inserts (see Fig. 5-28)
a. INSERT, SHAFT SEAL (2 ea.) MPL Item 2-155.
b. PACKING (O-ring, 2 ea.) MPL Item 2-116.
c. Procedure
1. Apply G-661 lubricant to o-ring and install as shown in Fig. 5-28.
2. Form a bead of No. 3144 sealant around the fillet area of the insert.
3. Install the two inserts in the Front Panel. Tighten until snug, then back off 2
°
to 3°. Remove any
excess sealant.
25. Finish installation procedure for Main Circuit Board Assembly
a. Procedure
1. Install washer and nut on BNC connector. Tighten nut to a torque reading of 20
±
3 inch-pounds.
2. Install Main Circuit Board holding screws.
26. Install Power Switch Shaft Into Front Panel (see Fig. 5-29)
a. EXTENSION-SHAFT MPL Item 2-14.
b. BUSHING MPL Item 2-15.
c. Procedure
1. Insert the bushing into the Power Switch Seal that was previously installed in the Front Panel.
2. Apply G-661 lubricant to the detent area of the Power Switch Shaft.
3. Install as shown in Fig. 5-29.
27. Installation of the POSITION knob and the FINE POSITION knob (see Figs. 5-30 and 5-31)
a. KNOB, POSITION MPL Item 2-4.
b. KNOB, FINE POSITION MPL Item 2-2.
c. Procedure
1. Apply G-661 lubricant to the POSITION knob as shown in Fig. 5-30.
Figure 5-28. Lubrication of the O-rings and sealing
for the cam switches
Figure 5-29. Installation of the POWER SWITCH.
5-16