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GV30N TROUBLESHOOTING MANUAL
RESPONDING TO ALARMS
PAGE 4.1.44
VERSION 0.1 2014-11-01
PA PWB Replacement
See Figures
MD-
and
MD-
in the Mechanical Drawings section (Section 5) of this manual.
1.
Remove the RF power module’s right-hand side cover (see
) by
removing 11 M3 countersunk screws. Retain hardware for re-installation.
2.
Before replacing a suspect PA PWB, verify the fault is with the suspect PA PWB by performing the
continuity and resistance checks detailed in
“PA Resistance Checks” on page 4.1.45
prompted to replace a PA PWB, return to
3.
Unsolder and remove the four solder connections to the defective PA PWB. They include two
24 AWG links (to pads V and X), a white 12 AWG wire (to pad U) and a 16 AWG link (to pad D).
4.
Remove the two #4 screws, split and flat washers securing the FET to the heat sink.
5.
Remove the seven M3 screws securing the PA PWB to the heat sink.
6.
Obtain the replacement NAPA31
C
PA PWB from the station spares kit, if purchased.
NOTE
: FETs are static sensitive and must be handled in a static protected manner.
7.
Spread a small amount of thermal compound (Nautel Part # HAG39, from the station spares kit),
thinly and evenly, on the bottom of the FET flange on the new PA PWB.
8.
Secure the PA PWB on the module's heat sink using the seven screws removed in
correct orientation (same as the adjacent PWB). Do not tighten the four screws at this time.
9.
Secure the FET (Q1) with two # 4 screws, a mini-flat washer and a new split washer. Using a torque
screwdriver, alternate tightening the left and right screws on each FET, a quarter turn at a time,
until 6 inch-pounds (0.67 Newton-meters) of torque has been applied.
10. Tighten the seven PWB screws.
11. Solder the wires removed in
.
12. Re-install the RF power module right-hand cover and return the module to the transmitter (see
“Installing an RF Power Module” on page 4.1.41
CAUTION!
When installing FET securing hardware, you can damage the FET case if
you fully tighten one screw while the other is loose. Avoid this by alternately
tightening the two screws.
Содержание GV30N
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Страница 8: ...GV30N TROUBLESHOOTING MANUAL PAGE 4 VIII VERSION 0 1 2014 11 01...
Страница 92: ...GV30N TROUBLESHOOTING MANUAL PARTS LISTS PAGE 4 2 10 VERSION 0 1 2014 11 01...
Страница 318: ...VERSION 0 1 2014 11 01 SD 32 Figure SD 32 NAE107A or NAE107A 01 Exciter...
Страница 327: ...VERSION 0 1 2014 11 01 SD 41 Figure SD 41 NAFP109B Output Power Probe and Sample PWBs...
Страница 333: ...VERSION 0 1 2014 11 01 SD 47 Figure SD 47 UPS Interface Assembly Optional Nautel Part 219 5179 UPS Interface Upgrade Kit...
Страница 337: ...GV30N TROUBLESHOOTING MANUAL MECHANICAL DRAWINGS PAGE 4 5 4 VERSION 0 1 2014 11 01...
Страница 351: ...VERSION 0 1 2014 11 01 MD 14 Figure MD 14 NAPA31C Power Amplifier PWB Q1...
Страница 354: ...VERSION 0 1 2014 11 01 MD 17 Figure MD 17 NAI23A RF Drive Splitter Changeover Assembly FRONT BACK...
Страница 356: ...VERSION 0 1 2014 11 01 MD 19 Figure MD 19 NAL16 2 Input Reject Load Assembly TOP VIEW END VIEW 2 INPUT REJECT PWB A1...
Страница 363: ...GV30N TROUBLESHOOTING MANUAL LIST OF TERMS PAGE 4 6 2 VERSION 0 1 2014 11 01...
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