Nautel VS300 Troubleshooting Manual

Also see for VS300: Quick start guide Installation manual Operation and maintenance manual Preinstallation manual Troubleshooting manual

Nautel VS300 Troubleshooting Manual Manual pdf 47 page image

VS300 Troubleshooting Manual Responding to alarmsIssue 10.0 2019-01-18 Page 1-39Cooling fan replacementSee Figure MD-1 (top view) in the Mechanical Drawings section (Section 6) of this manual.1. Remove the transmitter’s top cover. Retain hardware for re-installation.2. Disconnect the fan mating plug (B1P1).3. Remove and retain four M4 screws securing the fan bracket assembly to thetransmitter chassis. Remove the fan bracket from the transmitter (see Figure 1.5 onpage 1-40).4. Remove and retain all M3 screws and other hardware that secures the fan to themounting bracket. Note the orientation of the bracket and fan before disassembling.5. Obtain a replacement fan (Nautel Part # ZAP50) from the station spares kit, ifpurchased, or a suitable equivalent (vendor part # is Minebea Motor Mfg. Co.3115RL-07W-B79-E51).6. Install the replacement fan on the mounting bracket using retained screws.7. Re-install the cooling fan bracket assembly in the transmitter chassis using retainedhardware.8. Reconnect the fan mating plug to the interface PWB (A3). If necessary, refer to Section4 of this manual for connector mating details for A3.9. Re-install the transmitter’s top cover.10. Re-install the transmitter in its host cabinet, reconnect all interconnect cables andrestore operation by enabling ac and RF power.CAUTION:Do not replace a cooling fan while ac power is applied to the transmitter. Failureto observe this could result in damage to the fan’s associated tachometercircuitry.