NV5/NV3.5 Troubleshooting Manual Responding to alarms
Issue 3.2 2014-12-10 Page 1-39
Module cooling fan replacement
See Figure MD-14 in the Mechanical Drawings section (Section 6) of this manual.
1. Disconnect the suspect cooling fan’s mating plug (B1P1 through B6P1).
2. Remove and retain the cooling fan’s two M3 captive screws that secure the fan to the module.
3. Obtain a replacement fan (Nautel Part # ZAP50) from the site spares kit, if purchased or a
suitable equivalent (vendor part # is Minebea Motor Mfg. Corp. 3115RL-07W-B79-E51).
4. Install the replacement fan using retained screws.
5. Return the RF power module to the transmitter (see “Installing an RF power module” on
page 1-29).
Control/interface PWB replacement
See Figure MD-1 in Section 6 of this manual.
1. Open the front door to gain access to the control/interface PWB (A1).
2. Remove all interconnecting plugs and wiring from the control/interface PWB. Note the
destination of each wire/connector (refer to Section 4, “Wiring/connector lists” on page 4-1
to locate wiring and connector mating tables).
3. Remove and retain 10 sets of mounting hardware from the control/interface PWB.
4. Pull the control/interface PWB away from the remote interface PWB (A2). It may be helpful
to gently pry the connector loose with a screwdriver.
5. Set all jumpers on the replacement PWB to the same positions as the defective PWB.
6. Install the new control/interface PWB by reversing steps 3 and 4.
7. Reconnect all mating connectors and wiring to the new control/interface PWB.
8. Return the transmitter to service.
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