screws, the two No. 6 split-ring lock washers, and the two No. 6 flatwashers that secure the
capacitor clamp P/N 755017A4075 and capacitor C1 to component bracket P/N 755017A4064
and the case assembly.
Using a No. 1 Phillips head screwdriver and a 4-inch adjustable wrench, disconnect and tag the two
leads of inductor L1. Inductor L1 may now be removed from the component bracket by loosening
and removing the 6-32 x .50 LG Phillips head screw, the No. 6-32 hex nut, the No. 6 split-ring
washer, and the No. 6 flatwasher that secure inductor L1 to the component bracket.
Using a No. 1 Phillips head screwdriver and a 4-inch adjustable wrench, disconnect and tag all
harness leads to relay K1. Loosen and remove the two remaining sets of 6-32 x .25 LG Phillips
head screws, No. 6 split-ring washers, and No. 6 flatwashers use to secure component bracket
P/N 755017A4064 to Case Assembly 1A14.
TO INTERCONNECTION PCB ASSEMBLY
Refer to Detail C of figure 3-2. Once the card cage assembly and the component bracket have been
removed from the case assembly, Interconnection PCB Assembly 1A14A1 may be lifted up with
the cable harness for maintenance access.
If for any reason Interconnection PCB Assembly 1A14A1 must be replaced, it is recommended
that replacement of the entire 1A14 wiring harness P/N 755017A4090, of which 1Al4A1 is a
part, would be more efficient.
OF POWER AMPLIFIER TUBES
Power amplifier tubes 1A14V1 and 1A14V2 (Y-621B) contain BERYLLIUM
OXIDE (BeO) CERAMICS. The dust or fumes from BERYLLIUM OXIDE
CERAMICS are HIGHLY TOXIC and breathing them can result in serious
personal injury or DEATH.
Refer to Detail C of figure 3-2. Use a No. 1 Phillips head screwdriver to loosen and remove the
three 6-32 x .75 LG Phillips head screws, three No. 6 flatwashers, and three No. 6 lockwashers
that secure the two tube clamp A(P/N 755017A4406) and the one tube clamp B and thus tubes
1A14V1 and 1A14V2 to Case Assembly 1A14.
Carefully pull the tubes (1A1 4V1 and 1A14V2) from the fingers on Tube Socket Assembly
3-36. ACCESS AND/OR REMOVAL
OF TUBE SOCKET ASSEMBLY 1A14A2
Refer to Detail C of figure 3-2. After power amplifier tubes 1A14V1 and 1A14V2 have been re-
moved (see paragraph 3-38), use a No. 1 Phillips head screwdriver to loosen and remove the three
6-32 x .38 LG Phillips head screws and three No. 6 lockwashers that secure Tube Socket Assembly
1A14A2 to Case Assembly 1A14.
Lift the tube socket assembly and its wiring harness up away from the case assembly for mainte-
nance access. If removal is required, unsolder and tag all leads. Prior to reassembly, apply heat sink
compound (P/N 755017A4412) to the bottom surface of the tube block that touches the casting
of Case Assembly 1A14.