GV60 TROUBLESHOOTING MANUAL
RESPONDING TO ALARMS
PAGE 4.1.76
VERSION 1.0 2018-01-01
6.
Remove the six M3 screws securing the pre-amplifier PWB to the heat sink. Carefully remove the
pre-amplifier PWB from the exciter, taking care not to damage any of the links and wiring close to
the PWB.
7.
Obtain the replacement NAPA35 pre-amplifier PWB from the station spares kit, if purchased.
NOTE
: FETs are static sensitive and must be handled in a static protected manner.
8.
Spread a small amount of thermal compound (Nautel Part # HAG39, from the station spares kit),
thinly and evenly, on the bottom of the new pre-amplifier PWB.
9.
Secure the pre-amplifier PWB on the exciter’s heat sink using the six screws removed in
Ensure correct orientation. Tighten the screws.
10. Re-solder the four connections removed in
11. Re-install voltage regulator U1, its insulator and its heatsink on the plastic screw (see
for proper orientation). Ensure the leads of U1 are correctly positioned to allow re-
soldering to the three pads on the pre-amplifier PWB. Secure the items using the nut and washer
removed in
and torque hardware to 2 inch-pounds (0.22 Newton-meters).
12. Re-solder the three leads of U1 to the pre-amplifier PWB.
13. Re-install the exciter module’s top (or bottom) cover, using retained hardware, and re-install the
exciter module in the transmitter as described in
“Exciter Replacement” on page 4.1.69
14. To remove the second pre-amplifier, remove the opposite cover and repeat steps 3 to 12.
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Страница 463: ...VERSION 1 0 2018 01 01 MD 17 Figure MD 17 NAPA31C Power Amplifier PWB Q1 ...
Страница 466: ...VERSION 1 0 2018 01 01 MD 20 Figure MD 20 NAI23A RF Drive Splitter Changeover Assembly FRONT BACK ...
Страница 473: ...VERSION 1 0 2018 01 01 MD 27 Figure MD 27 NAL17 4 Input Reject Load Assembly TOP VIEW END VIEW 2 INPUT REJECT PWB A1 ...
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