TM 11-6625-3053-14
6-23.
REPLACEMENT OF RF TUNING HEAD.
REMOVAL
a.
Remove instrument dust cover (para 6-20).
b.
Remove rear panel through stage 2 (para 6-21).
c.
Remove the following controls by loosening their set screws:
ATTENUATOR
POWER SET/AUTO CAL
FREQ VERNIER
d.
Remove J8 RF OUTPUT through rear of panel by unscrewing retaining nut with a socket wrench to avoid
scratching front panel.
e.
Remove 2 flat head screws holding box assy 103505 to main frame floor.
f.
Remove 4 flat head screws holding the A5 leveling assy to main frame floor.
g.
Remove 4 flat head phillips screws holding RF tuning head main casting to main frame floor.
h. Lift tuning head assy up and out of main assembly and set down directly to the right of the sig gen. Dress
loose cables and wires so that they are not kinked.
REPLACEMENT
Reverse the removal procedure.
6-24.
REPLACEMENT OF DS1.
REMOVAL
a. Remove instrument dust cover (para 6-20).
b. Cut flat retaining spring nut from around DS1 behind panel and remove.
c.
Pull DS1 out slowly through front panel.
d. Cut open the tubing from the connections to DS1 and remove.
e. Unsolder leads from DS1 and remove DS1.
REPLACEMENT
a. Make sure wires leading to DS1 are properly twisted.
b. Slip a piece of protective tubing 3/16" diameter by 1/2" long on each wire beyond the bare end.
c.
Form a 1/4" diameter open loop of end of each wire and on end of each DS1 lead.
d. Slip replacement flat spring nut onto wires with spring nut curvature away from front panel.
e. Interlock one loop of each wire with one loop of each DS1 lead so that a mild mechanical bond has been
made.
f.
Solder the connections made in step e.
g. Slip the protective tubing over each connection.
6-87
