Vector-LP Radio Beacon Transmitter Technical Instruction Manual Page 5-13
Section 5 Maintenance and Troubleshooting Issue 1.1
NOTE
When an RF synthesizer PWB configured
to operate from an external RF drive
source is installed in a transmitter, its
frequency synthesizer must be operational
and its BCD switches must be set to
produce the assigned carrier frequency.
The synthesizer's output is used to obtain
the 2(g
PDM
) output which ultimately
determines the host transmitter's pulse
duration modulation frequency (g
PDM
).
(f) Perform RF drive symmetry testing
and adjustment procedures (see
4.3.6.9).
5.8.1.2 INTERPHASE PDM DRIVER PWB
REMOVAL/REPLACEMENT
(See 5.8 and 5.8.1 first)
(a) Remove the protective cover over the
interphase PDM driver PWB being
replaced (A6 or A9). The cover is
secured using seven sets of M3
mounting hardware.
(b) Remove and retain four sets of
mounting hardware for the interphase
PDM driver PWB being replaced (A6 or
A9). If the exciter interface PWB is to
be removed (see 5.8.1.3, remove both
interphase PDM driver PWBs, if
applicable, and go to 5.8.1.3.
(c) Pull the PWB(s) away from the exciter
interface PWB (A2). It may be helpful to
gently pry the connector loose with a
screwdriver.
(d) Install the new interphase PDM driver
PWB by reversing the steps above.
(e) Verify that shorting jumper E1 is
installed in the D position.
(f) For dual side transmitters, perform the
Equalizing Exciter Gain adjustment
procedure (see 4.3.6.10). For a single
side transmitter perform the
Calibrating Transmitter Output Power
adjustment procedure (see 4.3.6.3).
5.8.1.3 EXCITER INTERFACE PWB
REMOVAL/REPLACEMENT
(See 5.8 and 5.8.1 first)
(a) Remove all connections to the top and
bottom of the exciter interface PWB.
(b) Remove and retain 13 sets of mounting
hardware for the exciter interface PWB.
Remove the PWB.
(c) Install the new exciter interface PWB.
Re-install connections to the top and
bottom sides. Use the connector tag
labels or the connector mating
information after Table 8-2 to determine
proper connections.
(d) Set all shorting jumpers as per the
original exciter interface PWB.
(e) Re-install the RF synthesizer PWB(s)
removed in paragraph 5.8.1.1 and the
interphase PDM driver PWB(s)
removed in paragraph 5.8.1.2.
(f) Re-install the exciter/control assembly
in the transmitter by reversing the steps
in paragraph 5.8.
5.8.2 Exciter Monitor/Generator
PWB Replacement
See 5.8 first. Remove the exciter/monitor
generator PWB (A7 and, for dual side
transmitters, A10) as follows.
(a) Remove and retain four sets of
mounting hardware for the exciter
monitor/generator PWB being replaced.
(b) Remove all connections to the exciter
monitor/generator PWB.
(c) Install the new exciter monitor/
generator PWB. Re-install connections.
Use the connector tag labels or the
connector mating information in Section
8 to determine proper connections.
(d) Perform the following calibration
procedures: 4.3.5.5, 4.3.5.6, 4.3.5.7,
4.3.5.8, 4.3.5.9 and 4.3.5.10.
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