Nautel XL12, Technical Instructions

Page: 37 / 238

12 000 WATT AM BROADCAST TRANSMITTER
XL12
Page 2-13
01 January 2002
(c) Ensure the cabinet's front edges are flush with
a straight line representing the front of the
transmitter.
2.2.4 DISASSEMBLY REQUIRED:
Disassemble the cabinet to the extent necessary to
install the assemblies/modules which were removed
for shipping, as follows:
NOTE
Do not disassemble to a greater extent than is
necessary to complete the following procedures.
All hardware/parts removed during disassembly
must be retained for reuse during reassembly.
(a) Remove the rear door from the cabinet:
- unlock using one of the keys that was located
and saved during unpacking.
- disconnect door-to-cabinet ground wire.
- release door's spring-loaded hinge pin
- carefully lift away the door.
NOTE
A duplicate (spare) key is provided for the
IEC215 mechanical safety interlock system. It
should be placed in a controlled access area and
not issued unless the other key is lost. Use of the
spare key will circumvent the interlock system
and could cause a life-threatening situation to
occur.
(b) Remove the protective cover which prevents
non-intentional contact with the main AC
power contactor (A23K2), noting it is accessed
from the rear of the cabinet and is located on
the floor of the AC/DC power supply
compartment (see figure MD-1). The cover is
secured by four sets of M4 attaching
hardware. Retain hardware for reuse when
the cover is reinstalled.
(c) If the RF power modules are not installed,
remove the RF power module connector
access panels (two) which are immediately
below the RF power module mounting trays,
noting the lower panel also provides access to
the fan tray mounting trays. Each panel is
secured by a pawl fastener which requires a
quarter turn counter-clockwise to release.
(d) Gain access to the interior of the RF output
filter (A21) by removing its rear access panel.
The panel is secured by twelve sets of M5
attaching hardware (one bolt and one external
tooth washer per set).
(e) Gain access to the interior of the 8-input RF
combiner/filter (A22) by removing its rear
access panel. The panel is secured by fifteen
sets of M5 attaching hardware (one bolt and
one external tooth washer per set).
(f) Gain access to the RF feed cable's termination
point on the top of the transmitter. Remove the
top, front cover noting it is secured by ten sets
of M5 attaching hardware (one bolt and one
external tooth washer per set).
2.2.5 VISUAL INSPECTION:
It is
recommended a visual inspection be performed on
the cabinet interior, its removable modules/
assemblies and printed wiring boards. Inspect for
the following:
(a) Verify pointers of all meters are indicating
zero.
(b) Check for and remove any packing materials,
including tape or tyraps securing wiring that
was disconnected for shipment, noting wiring
associated with the AC/DC power supply is
tyrapped in the lower portion of the cabinet.
(c) Check for obvious damage and missing parts.
(d) Check electrical wiring for broken or frayed
insulation, loose or improper connections and
broken, shorted or pinched conductors.
(e) Verify all hardware is firmly tightened.
(f) Check for and remove any unwanted foreign
objects from the interior of the cabinet, paying
particular attention for floating conductive
materials such as strands of wire, metal
slivers/filings and loose hardware.
(g) If they were removed for shipping, visually
inspect each RF power module for obvious
damage and listen for loose or free floating
objects while rotating the module.