T M 11-5820-921-40-1
ACCESS AND/OR REMOVAL OF CONNECTOR 1A14J13
Refer to Detail C of figure 3-2. Use a No. 1 Phillips head screwdriver to loosen and remove the
two 4-40 x .5 LG Phillips head screws that secure connector 1A14J13 to two standoffs (P/N
755017A4019) mounted on Case Assembly 1A14.
If removal is required, unsolder and tag all leads for reassembly identification.
REMOVAL OF HEAT SINK COVER P/N 755017A4006
Refer to Detail D of figure 3-2. Use a No. 1 Phillips head screwdriver to loosen and remove the
13 No. 6 x .36 LG, 100 flat head screws that secure the heat sink cover to the case assembly;
then remove the heat sink cover.
REMOVAL OF HEAT SINK BLOWER 1A14B1
Use a No. 1 Phillips head screwdriver to loosen the four No. 4-40 x 3/4 LG Phillips head screws that
secure the heat sink blower to the case assembly with blower clamps P/N 755017A8014.
Refer to Detail D of figure 3-2. Use a 3/16-inch x 8-inch flat-blade screwdriver to loosen the
three No. 2 screws that secure the three leads to the heat sink blower terminal board and tag each
lead for reassembly identification.
ASSEMBLY AND/OR COMPONENT INSPECTION PROCEDURES
3-47. The power amplifier is a fully automatic unit, with solid state logic and control circuits. The unit
can be expected to function for extended periods with minimum attention. However, a normal periodic
preventive maintenance schedule of cleaning and inspection should be maintained. Table 3-6 list the
inspection procedures applicable to the power amplifier assemblies and components. Figures 3-29 through
3-65 (component location diagrams) can be used, if necessary, for specific component location while
performing the inspection procedures.
3-48. DIRT AND/OR RESIDUE
ON UNIT CONTOURS AND/OR COMPONENTS
3-49. Wipe surfaces with
a lint free cloth dampened with
technical isopropyl alcohol (Specification
MIL-I-10428) to remove film and/or residue with the exception of power amplifier tubes 1A14V1 and
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, Power amplifier tubes 1A14V1 and 1A14V2
should only be wiped with a dry lint free cloth. If the power amplifier case
is muddy, wash it with detergent and water. Let unit air dry.