TM11-5895-846-14
(11) Place the MONITOR switch to the 700
by performing steps (1) through (10) above in reverse
MHz position and adjust R16 on the A2 module for an
order.
b. Removal and Replacement of 70/700 MHz
indication of 25 on the MONITOR meter. Return the
MONITOR switch to the IPA OUT position.
(12) Close the upconverter drawer, tighten the
(1) On the upconverter front panel, place the
four front panel captive screws, dress the modem and
POWER circuit breaker to the OFF position.
amplifier/mixer cables into the cable trough, close all
(2) Remove cables from the following front
cable access covers, connect the 5 MHz cable to the 5
panel connectors: SHF OUT, 700 MHz IF, 70 MHz IF, 5
MHz OUT connector.
MHz IN, and 5 MHz OUT.
(3) Loosen the four captive screws on the
5-25. Removal and Replacement of Upconverter
front panel and open the upconverter drawer.
Modules (fig. 5-14)
(4) On module A2, remove the frequency
a. Removal and Replacement of Frequency
synthesizer coaxial cable (2) W6 from coaxial connector
Synthesizer Module Al (fig. 5-15).
J2 (630 in).
WARNING
(5) Remove coaxial cable W1 from coaxial
DANGEROUS VOLTAGES EXIST IN
connector J4 (700 MHz input). Remove coaxial cable
THIS EQUIPMENT. Do not attempt
W10 from coaxial connector J5 (NB 700 MHz input).
any removal or replacement unless
Remove coaxial cable W9 from coaxial connector J6
the equipment is in a nonoperating
(700 MHz output)
condition and all power circuit
(6) Loosen the captive screws which secure
breakers on the power distribution
the module to the chassis. Lift the module above the
panel are in the OFF postion.
chassis to gain access to the bottom connectors.
(1) On the upconverter front panel, place the
(7) Remove coaxial cable W4 from coaxial
POWER circuit breaker to the OFF position.
connector J1 (NB 700 MHz output). Remove coaxial
(2) Remove cables from the following front
cable W1 from coaxial connector J3 (70 MHz input).
panel connectors: SHF OUT, 700 MHz IF, 70 MHz IF, 5
(8) Remove the module.
MHz IN, and 5 MHz OUT.
(9) Replace by performing steps (1) through
(3) Loosen the four captive screws on the
(8) above in the reverse order. Replace the coaxial
front panel and open the upconverter drawer.
cables and tighten the connectors with the torque wrench
(4) At the 630 MHz in connector J2 on the
provided.
70/700 MHz upconverter module A2, disconnect coaxial
(10) After replacement, perform the gain
cable (J2) W6, which is connected to the frequency
adjustment procedure of paragraph 5-24 above.
synthesizer module Al.
c. Removal and Replacement of Equalizer Module
(5) On the frequency synthesizer module A1,
disconnect coaxial cable W5 from the RF output
(1) On the upconverter front panel, place the
connector on Gunn oscillator submodule Y2.
power circuit breaker to the OFF Position.
(6) Loosen the captive screws which secure
(2) Remove cables from the following front
control submodule A2 to the frequency synthesizer
panel connectors: SHF OUT, 700 MHz IF, 70 MHz IF, 5
chassis.
MHz IN, and 5 MHz OUT.
(7) Hold control submodule A2 above the
(3) Loosen the four captive screws on the
chassis to gain access to the L.O. OUT connector J2.
front panel and open the upconverter drawer.
Remove the upconverter coaxial cable W5 from
(4) Locate the A3 module on the underside of
connector J2.
the upconverter drawer in the left front area.
(8) Replace control submodule A2 and tighten
(5) Remove coaxial cable W2 from coaxial
the captive screws.
Replace the coaxial cable W6
connector J1 (input) and coaxial cable W8 from coaxial
which was removed above.
connector J2 (output).
(9) Loosen the captive screws on the front
(6) Loosen the captive screws which secure
panel of the frequency synthesizer.
equalizer module A3 to the upconverter chassis.
(10) At the right rear of the frequency
(7) Remove the module and replace by
synthesizer module A1, lift and momentarily hold the red
performing steps (1) through (6) above in the reverse
latch button while pulling forward on the module to
order. Replace the coaxial cables and tighten the
disengage its connector, then release the latch button.
connectors with the torque wrench provided.
Check that the disconnected coaxial cables are clear and
d. Removal and Replacement of 700/SHF Mixer
then continue to pull forward on the module and remove
it from the unit.
1. On the upconverter front panel, place the
(11) Replace the frequency synthesizer module
power circuit breaker to the OFF position.
5-41
