TM 11-6625-828-45
attenuator assembly Z105 (fig. 3-1) from both the top
112.Remove shaft MP112 and washer H121 from
and bottom of the chassis.
attenuator A107.
(2) On the front panel, loosen the setscrew
(7) Loosen screw H125 that secures rack
and remove the ATTENUATOR UV control dial from
gear MP114 to attenuator assembly A107.Remove
shaft MP112 (fig. 3-6). Remove the round knurled nut
screw H125, washer H124, and rack gear MP114.If
beneath the dial that secure the upper portion of
necessary, loosen and remove screw H127 from rack
attenuator assembly A1l to the front panel.
gear MP114.
(3) On the lower portion of the attenuator
(8) If necessary, remove adjustment screw
assembly, disconnect the RF cable (fig. 3-1) from
H126 and locknut H128 from tube assembly A106.
connector J103 (fig. 3-6).
(9) Remove two screws H122, two washers
(4) On the upper portion of the attenuator
H123, and one spring MP113.
assembly, loosen two setscrews H119 and r move gear
(10) Withdraw sleeve assembly A105 from
MP111. Remove shaft MP112, wash 1I120, and washer
attenuator A107.
H121.
(11) If necessary, unsolder resistor R191 from
(5) On the front panel, remove the cc from 1
loop MP116 and sleeve MP119.
VOLT connector J105.
(12) Withdraw plate MP115 and unsolder loop
MP116 from the cable.Remove mica washer MP117.
NOTE
(13) Unscrew and remove tube MP123,
To prevent dropping the attenuator
together with connector J104, sleeves MP120, spacers
assembly, support the attenuator
MP121, grommet MP122, and cable assembly W102,
assembly with a free hand while
from tube assembly A106.
performing the following step.
(14) If necessary, unsolder sleeve MP119 from
(6) Use a screwdriver to remove the four
tube of tube assembly A106.
screws from the front panel that secure t lower portion of
(15) Unscrew the clamping nut supplied with
the attenuator assembly al connector J105 (fig. 3-6) to
connector J104 and slide back on the cable. Unsolder
the front panel.
the cable lead to connector J104 and remove the
(7) Use a screwdriver to remove the four
connector.
screws and four washers from the front par that secure
(16)Remove sleeves MP120 and spacers MP121 from
ATTEN connector J104 to the from panel. Withdraw
each end of cable assembly W102.
connector J104 from the panel.
(17) Slide the clamping nut (supplied with
(8) Move the RF attenuator assembly toward
J104), grommet MP122, and tube MP123 off cable
the back of the chassis. Withdraw the attenuator
W102.
assembly upward through the chassis aperture.
(18) If damaged or replacement is required,
b. When the RF attenuator assembly is removed,
remove adjustment screw H126 and locknut H128 from
the rack gear and cable assembly may disassembled.
tube assembly A106.
Refer to figure 3-6, and proceed as follows:
c. Reassemble the RF attenuator as follows:
(1) Use a 3/8-inch fixed-face spanner wrench
(1) Replace the clamping nut (supplied with
to loosen and remove plug MP109.
J104), grommet MP122, and tube MP123 on cable
(2) Unsolder tube MP110 and connection wire
assembly W102 (fig. 3-6).
from connector J103.
(2) Replace sleeves MP120 and spacers
(3) Remove four screws H116 and washer
MP121 on each end of cable W102.
H117 that secure connector J103 to the attenuator
(3) Solder the cable lead to connector J104.
assembly.
(4) Slide the clamping nut (supplied with
(4) Remove two screws H118 and washer
connector J104) down the cable into J104 and tighten.
H117, and remove connector J105 from attenuator
(5) If removed, solder sleeve MP119 to the
assembly A107.
tube of tube assembly A106.
(5) If necessary, unsolder tube MP110 a wire
(6) Thread tube MP123 together with cable
from connector J10.
assembly W102, spacer MP121, and sleeve
(6) Loosen two setscrews H119 and remove
gear MP111 and washer H120 from shaft MP-
3-8
