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|  TM 11-5820-873-34
Section IV. MAINTENANCE
3-7. General.
3-10.
VHF Mixer (14), IF Filter (15), Side-band
Direct support maintenance of the AN/URC-92 is limited
Generator (16), and Audio (17) Circuit Card
to the replacement of interconnecting cables, circuit
Assemblies
card replacement and the procedures outlined in this
manual.
a. Removal.
3-8. Spectrum Generator (8), Low Digit Generator
(1) Remove transceiver top cover.
(9), Translator (10), and VHF Divider (11)
(2) Remove four mounting screws (1) and
Circuit Card Assemblies
washers
(2) from top of Receiver/Exciter.
a. Removal.
(3) Lift off top protective cover (3).
(1) Remove transceiver top cover.
(4) Gently extract circuit card.
(2) Remove four mounting screws (1) and lock
b. Replacement.
washers (2) from top of Synthesizer Assembly.
CAUTION
(3) Lift off top protective cover (3).
Upon reinstallation of these circuit
(4) Gently extract circuit card
cards, component side must face
b. Replacement.
front of transceiver.
CAUTION
(1) Gently reinstall circuit card.
Upon reinstallation of these circuit
(2) Position protective cover (3) in place
cards, Component side must face
(3) Reinstall four mounting screws (1) and
rear of transceiver.
washers (2).
(1) Gently reinstall circuit card.
(4) Reinstall transceiver top cover.
(2) Position protective cover in place (3).
3-11. RF Power Amplifier Assy
(3) Reinstall four mounting screws (1) and
a. Removal.
washers (2).
(1) Remove four mounting screws and washers
(4) Reinstall transceiver top cover.
attaching heat sink and RF power amplifier to rear
panel.
3-9. VHF VCO (4) Circuit Card Assembly
(2) Carefully pull heat sink and RF power
amplifier away from back panel.
a. Removal.
(3) Disconnect coax cable connector.
(1) Remove transceiver top cover.
(4) Remove two retaining nuts and washers
(2) Remove transceiver bottom cover.
from connector 1A8P1.
(3) Remove six mounting screws (12) attaching
(5) Disconnect connector 1A8P1.
front panel (13).
(6) Disconnect connector 1A8P3.
(4) Pull front panel away from receiver.
b. Replacement.
(5) Disconnect electrical quick disconnect
(1) Reinstall/replace gasket.
1A3P1
(2) Reconnect connector 1A8P3.
(7) from 1A4A5J1 on front of VCO board (4).
(3) Reconnect connector 1A8P1.
(6) Remove four mounting screws (6) and
(4) Reinstall two retaining nuts and washers on
washers
connector 1A8P1.
(5) from front of VCO board (4)
(5) Reconnect coax cable connector.
(7) Gently slide out VCO board.
(6) Position heat sink and RF power amplifier in
b. Replacement.
place.
(1) Gently reinstall circuit card.
(7) Reinstall four mounting screws and lock-
(2) Reinstall four mounting screws (6) and
washers.
washers (5).
3-12. Antenna Coupler Tuning Control
(3) Reconnect electrical quick disconnect
1A3P1 (7) to 1A4A5J1 on front of VCO board (4).
a. Removal.
(4) Position front panel in place.
(1) Remove transceiver top cover.
(5) Reinstall six mounting screws (12).
(2) Remove four mounting screws (4) and lock-
washers (3) from front tuning control (2) 1A2.
(6) Reinstall transceiver bottom cover.
(7) Reinstall transceiver top cover.
3-16
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