TM11-5895-846-14
TRACK IF, 70 MHz IFF, and 5 MHz IN.
5-31. Removal and Replacement of Downconverter
(3) Loosen the four captive screws on the
front panel and open the downconverter drawer.
(4) On downconverter module A3 remove the
Snythesizer Module A1.
downconverter coaxial cable W5 from the DC1
(1) On the downconverter front panel, place
connector J2.
the POWER circuit breaker to the OFF position.
(5) On module A3, remove. coaxial cable W3
(2) Remove cables from front panel
from the WB700 IN connector J3, and coaxial cable W4
connectors SHF IN, TRACK IF, 70 MHz IF and 5 MHz
from the NB700 OUT connector J2.
IN.
NOTE
(3) Loosen the four captive screws on the
To the left of 700 IN WB connector J3,
front panel and open the downconverter drawer.
(4) At
synthesizer
subassembly
AiA2,
remove coaxial cable W9 from the J3
disconnect the downconverter coaxial cable W10 from
LO IN connector.
the 630 MHz OUT connector J2.
(6) At the front of module A3 remove
(5) At the synthesizer subassembly A4Z1
semirigid cable WI from the FLI connector.
disconnect the downconverter coaxial cable W9 from the
(7) At the rear of module, on the Al
SHF LO OUT connector J2.
subassembly remove coaxial cable W2 from connector
(6) Loosen the eight captive screws on the
IF OUT J2.
front panel of the synthesizer, lift the red retaining
(8) At the rear of the module, loosen the two
LATCH button at the rear of the synthesizer, and slide
captive screws on chassis cable connector P4 and
out the module from the chassis by pulling on the front
remove the connector from module connector J5.
panel handle.
(9) Loosen the six captive screws which
(7) Replace the synthesizer by performing
secure the module to the chassis.
steps (1) through (6) above in reverse order. Reconnect
CAUTION
the two coaxial cables and tighten the connectors with
Carefully remove the module while
tilting it slightly to the right to avoid
b. Removal and Replacement of Downconverter
any undue bending of semirigid cable
Module A2.
W1.
(1) On the downconverter front panel, place
(10) Replace the module by performing steps
the POWER circuit breaker to the OFF position.
(1) through (9) above in reverse order.
(2) Remove cables from the following front
(11) Reconnect the cables and tighten the
panel connectors: SHF IN, TRACK IF, and 70 MHz IF.
connectors with the torque wrench provided.
(3) Loosen the four captive screws on the
(12) After replacement, perform the 700 MHz
front panel, open the downconverter drawer, and remove
coaxial cable W10 from the 630 IN connector A2J2.
d. Removal and Replacement of Power Supply
(4) On module A2, remove coaxial cable W7
Module PSI.
from the RCV IF connector J3, coaxial cable W8 from
(1) On the downconverter front panel, place
the TRK IF connector J4, and coaxial cable W6 from the
the POWER circuit breaker to the OFF position.
700 IN connector J1.
(2) Remove cables from the SHF IN, TRACK
(5) At the rear of the module, loosen the two
IF, and 70 MHz IF front panel connectors.
captive screws on chassis cable connector P3 and
(3) Loosen the four captive screws on the
remove the connector from module connector J5.
front panel and open the downconverter drawer.
(6) Loosen the six captive screws which
(4) On the PS1 module remove chassis cable
secure the module to the chassis. Carefully remove the
connector P1 from module connector J1 by loosening the
module.
retaining ring and pulling out connector P1.
(7) Replace the module by performing steps
(5) On the module, remove chassis cable
(1) through (6) above in reverse order.
connector P2 from module connector J2 by loosening the
(8) Reconnect the cables and tighten the
two captive screws and lifting out connector P2.
connectors with the torque wrench provided.
(6) Under the downconverter chassis, remove
(9) After replacement, perform the gain
the six nuts and washers which secure the PS1 module.
(7) Remove the PS1 module from the chassis
c. Removal and Replacement of Downconverter
and replace it by performing steps (1) through (6) above
Module A3.
in reverse order.
(1) On the downconverter front panel, place
the POWER circuit breaker to the OFF position.
(2) Remove front panel connectors SHF IN,
5-51