Quantcast Disassembly and Reassembly of Fractional Megahertz Select Switch S4.

 

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Figure 3-1. Major components TS-1967/ARC-54, top view, cover removed.
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TM-11-6625-601-34 Maintenance Kit Electronic Equipment MK-733/ARC-54 (NSN
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Figure - TM-11-6625-601-340064
TM 11-6625-601-34
megahertz drive motor (46) from the frequency
proper terminal on the switch assembly (1-16).
counter (28).
b. Disassembly and Reassembly of Fractional
Megahertz Select Switch S4.
(j) Remove the spiral pin (47) that secures
the drive gear (48) to the drive shaft of the frac-
(1) Disassemble fractional megahertz select
tional megahertz drive motor (46). Slide the
switch S4 (fig. 32) as follows:
drive gear (48) off the shaft.
(a) Tag and unsolder all wires connected
(k) Remove the hexagonal nut (51) that
to fractional megahertz select switch S4 (17-19).
secures the right idler gear (54) to the right idler
(b) Remove the two machine screws (17)
shaft (55).
and switch spacers (19) that secure the wafer
(l) Slide the flat washer (52), the right
switch (18) to the frequency counter (28).
idler gear bearing (53), the right idler gear (54),
(c) Slide the wafer switch (18) off the
and the right idler shaft (55) off the mounting
switch shaft (part of frequency counter (28)).
screw (50). Remove the mounting screw (50)
(2) Reassemble fractional megahertz select
from the frequency counter (28).
switch S4 as follows:
(a) Slide the wafer switch (18) onto the
(m) Remove the hexagonal nut (57) that
secures the left idler gear (60) to the left idler
switch shaft (part of frequency counter (28)).
(b) Secure the wafer switch (18) in place
shaft (61).
(n) Slide the flat washer (58), the left idler
w i t h two machine screws (17) and switch
spacers (19).
gear bearing (59), the left idler gear (60), and
the left idler shaft (61) off the mounting screw
c. Disassembly and Reassembly of Frequency
(56). Remove the mounting screw (56) from the
Counter.
frequency counter (28).
(1) Disassemble the frequency counter (fig.
(o) Remove the two machine screws (62
3-2) as follows:
and 65) and lockwashers (63 and 66) that secure
(a) Tag and disconnect all wires con-
nected to the frequency counter (this includes
the standoff terminals (64 and 67) to the fre-
wires connected to switches S4 and S5).
quency counter (28). Remove the two standoff
(b) Remove the two incandescent lamps
terminals (64 and 67).
(27) from the front panel (68).
(2) Reassemble the frequency counter (28)
(c) Remove the four screws (24), lock-
as follows:
washers (26), and hexagonal nuts (25) that sec-
(a) Install the two standoff terminals (64
ure the frequency counter (28) to the front panel
and 67) on the frequency counter (28) and secure
(68).
w i t h the two lockwashers (63 and 66) and
(d) C a r e f u l l y r e m o v e t h e f r e q u e n c y
machine screws (62 and 65).
counter (28) and counter spacer (29) from the
(b) Install the mounting screw (56) in its
front panel (68).
proper hole on the left side of the frequency
(e) Remove the two machine screws (30),
counter (28).
(c) Slide the left idler shaft (61), the left
lockwashers (31 and 33), and hexagonal nuts (32)
that secure the left gear cover (34) to the fre-
idler gear (60), the left idler gear bearing (59),
quency counter (28).
and flat washer (58) onto the mounting screw
(f) Remove the two machine screws (36)
(56) and secure with the hexagonal nut (57).
and lockwashers (37) that secure the megahertz
(d) Install the mounting screw (50) in its
drive motor (35) to the frequency counter (28).
proper hole on the right side of the frequency
Carefully remove the megahertz drive motor
counter (28).
(35) from the frequency counter (28).
(e) Slide the right idler shaft (55), the
(g) Remove the spiral pin (38) that sec-
right idler gear (54), the right idler gear bearing
ures the drive gear (39) to the drive shaft of the
(53), and flat washer (52) onto the mounting
megahertz drive motor (35). Slide the drive gear
screw (50) and secure with the hexagonal nut
(39) off the drive shaft.
(51).
(h) Remove the two machine screws (40),
(f) Slide the drive gear (48) onto the drive
lockwashers (41 and 43), and hexagonal nuts (42)
shaft of the fractional megahertz drive motor
that secure the right gear cover (49) to the fre-
(46) and secure with the spiral pin (47).
quency counter (28).
(i) Remove the two machine screws (44)
(g) Place the fractional megahertz drive
and lockwashers (45) that secure the fractional
motor (46) in its proper position on the right side
megahertz drive motor (46) to the frequency
of the frequency counter (28) and secure with
counter (28). Carefully remove the fractional
two machine screws (44) and lockwashers (45).
3-5

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